JH Technology, Inc.

Product Focus - Pulse Conditioner

2011-11-08T07:38:00.000-08:00

MODEL JH2376

PULSE CONDITIONER

Full-featured Model JH2376 is the "big brother" to our low-cost JH376/JH377 pulse amplifier & converter (blog posting Oct 10, 2009). Fully isolated and capable of handling voltages from 20mV to 250Vrms (700V peak-to-peak) it serves applications ranging from tachometers and flow turbines to power and VFD (variable frequency drive) frequency monitoring. The input is safely isolated and converted to a 5V logic pulse output.

Adjustable sensitivity and optional filtering allow the user to tailor the unit for each application, optimizing sensitivity and frequency response versus noise rejection. DIN-rail mounted, the JH2376 is available with 115 and 230Vac power options.

Here's a link to the spec sheet: JH2376 Pulse Conditioner

Our previously-announced pulse conditioners are:

Model JH376 Pulse Amplifier. Millivolt inputs, dual channel, low cost, nonisolated.
Model JH377 Pulse Converter. Converts 5V logic to open-collector and vice versa. Dual channel, low cost, nonisolated.

We also make:

DC to Frequency Converters (Integrators: Models JH7500 & JH7501. JH7500, 5V logic pulse or open-collector output. JH7501, relay contact output, low pulse rates only. Plug-in style.
Model JH7010I Frequency to DC Converter (Frequency Input Transmitter). Plug-in style, fixed range.
Model JH7580 Frequency to DC Converter (Frequency Input Transmitter). Plug-in style, user-rangeable.
Model JH5700 Frequency to DC Converter (Frequency Input Transmitter). DIN-rail mount, fixed range.
Model JH1700 & JH1720 Frequency Input Alarm Trips. Plug-in style, fixed range. JH1700, single trip. JH1720, dual trip.

Signal Conditioners (our web site): http://www.jhtechnology.com/

Simple Special: Y = 1/X

2011-08-19T10:34:00.000-07:00

Our customer needed a simple mathematical inverter: Output = (Constant) x (1/Input). Our standard product line includes analog division.

We simply disconnected input A and tied it internally to full scale.

The key requirement was that the user properly specify the input/output relationship. (Note that at 0% input the output would be 1/0 = infinity.) This application required:

Input = 1 volt, Output = 5 volts

Input = 2 volts, Output = 2.5 volts

Input = 5 volts, Output = 1 volt

Mathematically this is: Output = 5 / Input.

We tied input A to a fixed internal voltage and set the instrument's gain appropriately.

JH Technology offers add, subtract, multiply, divide, square and square root functions in plug-in modules, DIN-rail transmitters and field mount transmitter/displays.

http://www.jhtechnology.com/

Product Focus - Math Functions

2011-05-17T13:22:00.000-07:00

Add
Subtract
Multiply
Divide
Square Root
Square Function

Special Modifications:

Sum with unequal input weightings (for example, add flows from two different-size flowmeters or power from two different transducers).
Unequal input & output ranges (for example, input = 0-10Vdc, output = 4-20mAdc)
Output = A x B / C
Alarms with math functions
Others - let us know what you need

Available in plug-in, field mount and DIN rail styles.

Links:

Add/Subtract Plug-In Transmitters

Add/Subtract Field Mount Transmitters

Add/Subtract DIN Rail Transmitters

Multiply/Divide Plug-In Transmitters

Multiply/Divide Field Mount Transmitters

Multiply/Divide DIN Rail Transmitters

Square/Square Root Plug-In Transmitters

Square/Square Root DIN Rail Transmitters

Our signal conditioner web site: http://www.jhtechnology.com/

E-mail: jhtek@jhtechnology.com

Phone: US toll free 800-808-0300, or 941-927-0300

True RMS Measurement Includes DC

2011-04-26T12:47:00.000-07:00

Simple Modifications meet Customer's Needs

When measuring AC voltages, DC components or offsets usually should be ignored. Examples include measuring AC ripple from a DC power supply, and data or audio signals superimposed on DC power lines. As shown in the figure, a blocking capacitor removes any DC component.

Therm-O-Link, a wire manufacturer in El Paso, uses rectified but triac-modulated power in their annealing operation. To monitor and control the annealing process they need to know the total voltage, DC plus AC. They also need true-RMS measurement for accurate power monitoring regardless of the waveform.

A simple modification to our true-RMS process transmitter, Model JH6010IR, removed the blocking capacitor for full DC response. Additional changes speeded the transmitter's response time for proper operation in their control system.

For the complete application note, True RMS: AC or DC Response?, click here.

True RMS Measurement Basics

RMS measurements express the power capability of an AC source. Low-cost meters and transmitters often make a simpler average measurement rather than true RMS. The two are not the same, and the relationship between average and RMS measurements varies for different waveform shapes. The figure shows a pure sine wave, a chopped and rectified sine wave and a square wave pulse.

True RMS measurements require more complex and expensive circuitry, generally available in slightly higher priced instruments.

To learn the fundamentals of RMS measurement click for our application note, What is True RMS - and When do I Need It?

JH Technology manufactures:
Plug-In True RMS AC Process Transmitter
DIN Rail Mount True RMS AC Process Transmitter
Field Mound True RMS AC Transmitter with Display
Plug-In AC Alarm Trips with True RMS Response

Our web site: http://www.jhtechnology.com/

Why We Like "Small" Customers

2011-02-22T11:04:00.000-08:00

You've probably heard the old "80 -20" rule - 80% of (xxxxx) come from 20% of (yyyyy). As applied to marketing, 80% of your sales come from 20% of your customers; therefore, you should focus the bulk of your efforts on the 20%.

Well, of course, we do pay attention to our larger customers, but we work just as hard to meet the needs of new and small users. Why? First, it's in our nature, but its also good for business. Here's our favorite success story.

In 2001 an engineer named Mike Sanders found us and asked if we could meet a special need - a 2-input load cell (strain gauge) transmitter. That's not one of our standard products, and he only needed a couple, but we found a way to modify our standard strain gauge transmitter (Model JH4051) to meet his needs. Small order, but we did it.

Jump forward to December 2002. Mike called us. He'd joined another company, Wave Biotech, who made mixing and packaging equipment for the pharmaceutical industry. Their product included four load cells and he had ideas which could improve it. His needs included the ability to accurately sum either three or four load cells, to choose either of two output ranges, adjustability/rangeability per specific requirements, and filtering - just enough to smooth the signal while maintaining a reasonably high response speed.

We built a quick prototype. He tested and liked it. We finished the design and laid it out on a circuit board to fit a cavity in their machine.

The result? They became our biggest single customer (in dollars). GE bought the company and moved the operation to Sweden in 2008. During the move we worked with them to improve EMI/RFI specs. They're still our customer and their orders remain as strong as ever.

Here's a link to their "how it works" page.

The US operation closed, unfortunately, but we still hear from Mike.

Here's a link to our Customs and Specials page. What can we do for you?

Our main web site (signal conditioners): http://www.jhtechnology.com/

2010 - A good year after all

2011-01-04T10:47:00.000-08:00

Happy New Year -

But for us, the old one turned out well, too.

2009 had been slow - no surprise - down 31% from our 2008 peak. The first 3 months of 2010 were equally bad - actually, worse - but then things turned around. Bookings (orders received) were our best year ever, 6% above our 2008 record. Shipment fell a bit short, but only because two customers asked that their large orders be held until January.

A few OEM customers whose orders had slowed significantly in 2009 came back strong. A couple new product offerings also helped: our fast-response transmitter line and our new tachometer pulse amplifier. Also, we added 46 first-time customers. (Some probably will be one-time-only, such as distributors ordering specific items at the request of their customers.) Our thanks to all, new and old.

One caution - some of the months were strong only because of one or two large orders. Without them we would have remained slow. Any predictions for 2011?????

Hope your 2011 goes well!

http://www.jhtechnology.com/

Happy Winter Solstice!

2010-12-21T05:35:00.000-08:00

Yes, today (Dec. 21, 2010) is the first day of winter. We can tell. Here in Sarasota we've had bone-chilling temperatures in the 40s and 50s (Fahrenheit, of course) and on a couple evenings it even dipped into the 30s. But, your writer (Harry) grew up near Buffalo, so I guess I can handle it.

Holiday Greetings.

It's a wonderful time of the year, whatever your beliefs. I was raised in the Christian tradition. So (and without any commercial benefit whatever, since I don't believe many people give signal conditioners as Christmas presents), I'm not ashamed to say:

Merry Christmas.

Christian beliefs include the Old Testament. Hannukah celebrates religious freedom. Judas Maccabeus led the revolt which restored the right of the Jews to practice their religion at the temple in Jerusalem. Hanukkah celebrates the miracle that one day's worth of lamp oil lasted 8 days. So, to our Jewish friends includng Bea next door and Myra and Stan down the steet, I wish you (belatedly):

Happy Hanukkah.

Kwanzaa, while not a religious holiday, celebrates the 7 principles of Unity, Self Determination, Collective Work and Responsibility, Cooperative Economics, Purpose, Creativity and Faith, wonderful guiding principles for communities of any belief or nationality. To our friends who celebrate it:

Joyous Kwanzaa, and Habari Gani?

I once worked with a fellow who claimed to be a Pagan. Of course, the timing of the Christmas celebration and some of its traditions (such as the Christmas tree) evolved from pagan winter solstice traditions (which is part of the reason the early Puritans forbade its celebration), So to all of you who may be pagans, non-religious or perhaps just tired of the excesses of the season:

Happy Winter Solstice.

(My apologies to those of other beliefs that I am not familiar with.)

And - an early Happy New Year from Harry and all of us at JH Technology.

Minisystem Measures Gas Flow

2010-12-01T16:58:00.000-08:00

Custom Mass Flow (Gas) Minisystem

Not new - we did this one a few years ago - but here's an example of what we can do.

An Alcoa extrusions plant in Spanish Point, Utah had been monitoring natural gas usage with turbine flowmeters (volumetric) but wished to convert to mass flow for improved accuracy. The turbine manufacturer could have provided a compensated measurement, but only if the flowmeters were replaced. As these were 3 and 4 inch meters replacement costs would have been high, and piping changes would have been needed. Alcoa needed a less-expensive solution.

Alcoa added temperature and pressure sensors to the gas lines, and JH Technology was able to create a mass flow Minisystem using signal conditioners. Five modules convert the turbine pulses to DC, perform multiplication and division, produce both 4-20mAdc and pulse rate outputs proportional to mass flow in SCFH (Standard Cubic Feet per Hour) and provide 24Vdc power to the pressure and temperature sensors. The modules were premounted and wired on a panel and placed inside a NEMA-4 field enclosure.

Alcoa reported that the system provided significant savings compared to the costs of new flowmeters, and even more by eliminating the need for piping changes.

To read the complete application note, click here.

Links: Our Specials & Minisystems page
Application Notes index
All JH Technology signal conditioners

Thanksgiving 2010

2010-11-22T16:32:00.000-08:00

Thanksgiving

We've a lot to be thankful for this year. First and foremost, of course, our families, friends and health. We all have our individual families plus, our "family" at JH Technology.

We're grateful, of course, to our customers, but we also appreciate those of you who are interested in what we do even though you may not have needs or opportunities we can meet at this time.

We're thankful this year that we have grown despite the economy. We're almost back to where we were before last year's "dip". We appreciate our employees who took some temporary pay reductions last year and for our suppliers who were understanding when we ran behind on payments.

And, despite what your feelings may be regarding the politics of the moment, we're especially thankful to be able to live and work in America. We aren't perfect or always right and we have our problems and disagreements, but still we're fortunate to live in one of the best places in the world.

Give thanks - to your friends and family, to those who love you, to whatever god or deity you may believe in - and be grateful for what we all have been given.

Happy Thanksging

From Harry and all of us at JH Technology.

Speaking of Specials - - -

2010-11-07T10:22:00.000-08:00

Pulse Amplifier:
Special Product - leads to a second special - then two standard products - and then yet a third special!

A bit of "fun" history here - our standard Models JH376 & JH377 were introduced last year (blog entry October 10, 2009).

In 2001 an engineer at a Canadian company - lets call it "Company A" - contacted us. They were using another manufacturer's pulse amplifier which worked but was inconvenient to mount in their system. We quoted, designed and sold them a functional equivalent in a DIN-rail mount case. The engineer later left and the orders stopped.

The same engineer called us in 2004, now with a different firm ("Company B") and with a modified set of requirements. He needed different - and adjustable - sensitivity, different filtering and the ability to accommodate both mag pickup and logic pulse inputs. We worked with him to prototype and develop a new design. They ordered regularly for about two years but then, early 2007, the orders stopped. (We later learned he'd gone back to "Company A".)

So - we now had a design but no customers. We decided to "run it up the flagpole" as a standard product and see what happened. After reviewing both companies' requirements plus competitive products we revised the standard product's filtering and sensitivity specs a bit. Introduced a year ago, it's been a modest success including a new OEM customer.

And now. "the rest of the story". In August "Company B" called again. They reordered their version but really wanted yet a different set of requirements. We again worked with them to develop a new version which they have since bought. We also contacted the original engineer at "Company A" but their systems have changed and they no longer need pulse amplifiers.

Our standard products (with links):
Pulse Amplifier: Model JH376, optimized for use with mag-coil type magnetic pickups.
Pulse Converter: Model JH377, optimized for use with logic pulse and open-collector inputs.
Or, if you need specials, contact us - jhtek@jhtechnology, (800) 808-0300 or (941) 927-0300,

Our web site: http://www.jhtechnology.com/

Sarasota Arts Scene - Jazz

2010-09-25T12:18:00.000-07:00

From Harry this week - personal interest.

For a small city, Sarasota has an incredibly vibrant arts scene. Here's an example.

My wife, Jacquie, and I went to a jazz concert at a local church. A six-piece group, they performed incredibly well. Their ages - 13 to 17 years old, and they've been around three years. From their publicity:

"They created the group three years ago, playing jazz in front of a local grocery store on Saturday mornings. Seeing how determined they were, Greg Nielsen, a jazz trombonist, took them under his wing and has been coaching them ever since."

They've made several television appearances including the Grammy awards and, this past summer, appeared at three European jazz festivals including Montreux in Switzerland. (The cost - $35.000.) The thirteen year old is the very petite female trumpeter/vocalist. It's surprising to see such power (both trumpet and voice) from such a small girl. An audience member told us she started the group at age nine. She's incredible - from the on-stage appearance it seems like she's the leader. Three previous members of the group have graduated and gone on to college.

Anyway, as I said, personal interest this week. If you're interested here's a link to their site, complete with videos.

http://www.jazzjuvenocracy.com/

Discontinued Action-Paks? Call us.

2010-09-18T16:38:00.000-07:00

As most of you know, many years ago Action Instruments introduced plug-in "Action-Pak" transmitters and alarms.(Note: Action-Pak is an Action Instruments trademark.) Action grew, became a highly regarded company, added other product lines and were eventually acquired by Eurotherm. Their line still includes Action-Paks but some models are no longer available.

One of our favorite stories - a company called us desperately looking for a special version of an old Action module. They told us, not only could Action no longer make it, they insisted they never had! The customer forwarded us a copy of Action's user's manual.

OK - a special - a one-piece order - we had to charge for some engineering, but we did it. They've ordered a few more since.

Over ten years ago another company came to us because Action no longer made some of the (standard) products they used regularly. Our product line included them (still does) and that company has become one of our better customers.

We're not trying to knock Action. They are a well-respected, quality company. But if you need plug-in modules they no longer offer, e-mail or call us. We probably can help. (And, our customers rave about our service.)

Signal Conditioners - our web site: http://www.jhtechnology.com/
e-mail: jhtek@jhtechnology.com
Phone: (941) 927-0300 or US toll-free (800) 808-0300
Fax: (941) 925-8774

Political Ads - Lying is Legal

2010-09-05T17:53:00.000-07:00

From Harry -

Here in Florida we just finished a typical primary campaign featuring two Republican candidates for Governor, and two Democratic candidates for Senate, heaping piles of dirt on each other. I got to thinking - somewhere in the past I'd read that court decisions had declared lying in political ads to be protected by the Constitution.

After strenuous research (meaning 30 seconds on Yahoo) I found I was right. What's worse, the Federal Communications Act prohibits broadcasters from refusing to run specific ads - even those known to be untrue - unless they refuse all political advertising. If you're interested, here's a link to a 2008 Time Magazine article on the subject.

Truth in Advertising? Not for Political Ads

Don't believe everything you hear!

Thermocouple Application Note

2010-08-30T16:54:00.000-07:00

Unusual Thermocouple Application

Our customer's client had a large spa facility. The controls had been located near the spa, but the client felt they should be moved to a more benign environment, several hundred feet away. The system included four thermocouples. Sending thermocouple signals this distance is expensive, since thermocouple wire (not copper) must be used. Even more basic, sending weak millivolt signals hundreds of feet leaves them subject to interference and signal degradation.

To boost the signals, four standard thermocouple transmitters (our Model JH4130) were added near the spa. Their 4-20mA current signals easily traveled the distance with no degradation. The system designers opted not to change the control system, so it was necessary to convert the current signals back to their original thermocouple voltages. "Reverse" thermocouple transmitters, 4-20mA input, thermocouple output, were needed.

We provided them. We modified our Model JH4300 DC input, DC output transmitters to have the proper millivolt outputs. The most interesting challenge was, the millivolt outputs needed to be connected to thermocouple wires (not copper) for proper connection to the system's thermocouple inputs. This called for the reverse of cold junction compensation (we called it "cold junction un-compensation"). A temperature sensor embedded in the output terminals and some properly-designed circuitry solved the problem

Temperature Transmitters & Signal Conditioners - our web site: http://www.jhtechnology.com/

Application Note

2010-08-08T12:24:00.000-07:00

AC to DC Translation Monitors Shaker Motion

Here's an application we did 10 years ago for a major manufacturer of membrane-based filtration equipment. They're still using it.

The need - to monitor and control filter movement. Motorized systems are used to oscillate large filter elements back and forth. Peak-to-peak motion is controlled using motor drives. Motion is continuously monitored using laser-based displacement (position) measurement equipment.

The problem – the laser’s output represents instantaneous position, varying continuously as the filter shakes back and forth. The company needed to convert peak-to-peak displacement to 4-20mAdc input current for the motor drive controllers.

The solution – our Model JH5600 AC Input Transmitter. Because the filters are large and driven by rotating equipment their motion is purely sinusoidal so the relationships between average, RMS and peak values are well known. In this application an input range of 0 to 3.536 volts RMS (odd ranges are not special for us) corresponds to 0 to 10 volts peak-to-peak. We have in the past created special modifications for true peak-to-peak measurement, but this was not required for this application

For those who prefer plug-in style modules, the same function is available in our Model JH6010I.

Click here for a link to a pdf of this application note.

AC Input Transmitters, Signal Conditioners - our web site: http://www.jhtechnology.com/

JH5600 data sheet: www.jhtechnology.com/dinrail_tx/jh5600_5610.htm

New Products

2010-07-13T10:18:00.000-07:00

Integrators
(DC to Frequency Converters)

Brand-new Models JH7500 & JH7501 integrators convert a DC measurement signal (voltage or current) to a proportional frequency. JH7500 is the general-purpose version. JH7501 operates at low pulse rates - its output is a set of relay contacts that 'click' at the output pulse rate.

Integrator - why the name?

The original - and still common - application is to totalize, or "integrate" flow measurements. A signal from a flowmeter represents flow rate (such as gallons per minute). Each output pulse represents a fixed quantity (such as a gallon, fraction of a gallon or number of gallons). The pulses are fed to a counter. The faster the flow the faster the pulses, so the total flow may be found by reading the counter. Similarly, if the input represents instantaneous power (kilowatts) the total represents power usage (kilowatt-hours).

More modern applications include signal conversion (convert a DC measurement signal to frequency for a PLC's input) and tone telemetry (transmit the converted frequency over a distance, then convert it back to DC at the receiving eng. JH Technology offers frequency to DC converters (also called frequency input transmitters) to perform the receiving end conversion.

For product details click:
JH7500/JH7501 Integrators (DC to Frequency Converters
JH7010I Frequency to DC Converter (Plug-in style, fixed range)
JH7580 Frequency to DC Converter (Plug-in style, user rangeable)
JH5700 Frequency to DC Converter (DIN-rail style, fixed range)

Our web site: http://www.jhtechnology.com/

New from JH Technology

2010-06-17T13:01:00.000-07:00

FAST Response!

Transmitters with 1 millisecond response time.

Last year we spotlighted a new design we'd done for a customer needing a quantity of fast-response transmitters. We've now turned it into a standard product offering.

Available on most of our DIN-rail transmitters (JH5000 Series), Option HS output is approximately complete (95% response) in 0.001 seconds. It is not available on AC input or frequency input transmitters, as these require filtering to function properly.

Frequency response is 3dB down (0.707 times the DC gain) at approximately 600 Hz.

Faster (or slower) available - contact us!

Link to Fast Response Process Transmitters

Signal Conditioners & Process Transmitters (link to our web site): www.jhtechnology.com/

e-mail jhtek@jhtechnology.com

Custom Designs

2010-06-13T08:36:00.000-07:00

A Very Special Special

A well-known company needed to duplicate a thermocouple alarm they had bought from Action Instruments decades ago. Action was no longer able to provide it so they turned to us.

Action's original "Action Pak" line (Action's trademark) once included alarm modules with extra options such as retransmitting outputs and remote setpoint inputs. 20-pin headers (pin bases) were required to provide the extra connections. As far as we are aware these headers are no longer available.

Our customer's requirement was a nonstandard version of one of those alarms. We replied that we could provide the same function but with a different connection arrangement. This was not acceptable - it was for a nuclear power application and they could not vary the system design. Only one piece, but they were willing to pay for it.

Once again we got lucky. In 1995 we had purchased some 20 pin headers for another customer's need and had a handful left. Our customer bought one (couldn't convince them to buy a spare) - even sent an inspector to Florida to do a source inspection. That was 2008. In 2009 they again bought one and just now ordered two more! Possible future problem - after this order we have only five headers left.

(Note: We do not sell nuclear-approved products. This alarm was sold as "standard commercial quality" for a noncritical application.)

Technical detail: the custom alarm module has two retransmitting 0-1V analog outputs, one proportional to temperature and the other proportional to the setpoint. Our customer was able to supply us with Action's specifications and we designed it to be functionally identical. Here's the functional diagram.

If you have special requirements let us know. Phone (941) 927-0300 or toll-free (800) 808-0300.

E-mail jhtek@jhtechnology.com.

Link to our page on Custom & Special Signal Conditioners.

Signal Conditioners, General - our web site: http://www.jhtechnology.com/

Economic Upturn?

2010-05-31T12:01:00.000-07:00

Maybe. We're seeing signs.

After a best-ever 2008 we saw about a 25% downturn in 2009. 2010 started off equally bad, maybe even worse. Then, April & May were strong - above our 2008 average. We're cautious, though. The two months were helped by unusually large orders from four customers. So - cautiously optimistic!

Another sign - not necessarily good - component shortages and lead times are increasing rapidly - up to 20 weeks. So far we're able to cope, as most of our parts are available from multiple sources.

Such problems aside, let's hope the improvement continues.

Application Note

2010-05-23T08:28:00.000-07:00

Detect Thermocouple Failure Without Upsetting the Process

One from the archives. Our customer needed to alarm on thermocouple failure without shutting down the process.

Thermocouple instruments commonly include upscale burnout indication. If the thermocouple breaks or fails open-circuit the instrument's output goes high, just as if the temperature had gone out of control. This often is used to insure failsafe failure, shutting the process down and sounding an alarm.

Our customer, a utility, needed an overtemperature shutdown on a monitored water temperature. They also wanted to trip an alarm upon thermocouple failure but without interrupting the process. We were able to suggest a simple dual-trip alarm setup to do this.

Our thermocouple instruments, like most others, offer a downscale burnout option. (Thermcouple failure causes the output to go low instead of high.) Using a dual-trip alarm, we set trip #1 for HI trip and trip #2 for LO. The HI trip, of course, was used to shut the process down on excessive temperature. The LO trip was set below freezing. Its relay would trip when the thermocouple failed but never under normal operation.

For the full application note, click here.

Our web site - Signal Conditioners, Process Transmitters: http://www.jhtechnology.com/

E-mail: jhtek@jhtechnology.com

Export Sales

2010-05-16T17:24:00.000-07:00

Helping the balance of trade -

Although the majority of our sales are within the US we welcome interntional orders. In the past two weeks we've shipped:

25 more pieces of a custom assembly (4-input load cell amplifier) for our good OEM customer in Sweden. They buy a few hundred per year - we have an open order for 50 more right now.
30 more JH4380W rangeable DC transmitters - specials - with extended temperature ICs to guarantee operation to minus 40 degrees. Although shipped to a US customer, they will be using them in systems exported to Russia. A repeat order - they ordered 54 last year.
6 transmitters to an overseas distributor.

We're grateful for all orders, foreign or domestic.

Current Booster

2010-04-15T17:11:00.000-07:00

THE BOOSTER!

Well, ok, not that booster!

Another "rush" special - to boost the current drive from a voltage signal. Our customer needed -10 to +10 volts to drive a 50 milliamp load. The voltage output from their control signal could supply only a fraction of that, so they needed an output-equals-input driver or current booster. They called us.

Additional needs: "ASAP - yesterday if possible" because they had just discovered the system problem.
Very high accuracy for their test application.

We got lucky. Years ago we solved another customer's high-current requirement by designing a custom circuit board. The requirements were different, but we were able to use that board to assemble the required circuit. It so happened that we had three of those boards left. Our customer needed four, but two could wait. We received the order March 22, shipped the first two March 23 and ordered a few more boards from a quick-turnaround service.

Accuracy? We guaranteed +/-3mV on a 20 volt wide span (+/-0.015% of range).

The customer has now asked us to quote on an 8-channel version.

This one isn't on our web site, but you can see examples of other special & custom signal conditioners at www.jhtechnology.com/customs.

Two Wire Transmitters

2010-02-13T05:39:00.000-08:00

Some People Like

Trimpots!

We recently picked up a new customer who ordered a few of our 2-wire thermocouple transmitters. This customer sells thermocouples and other temperature probes, and the manufacturer they represent also offers transmitters from a well-knows European company.

Why did they buy ours? The European brand is computer-ranged. The end user wanted to be able to adjust calibration without needing a computer set-up. So, they bought our "old fashion analog" fixed range Model JH220 - complete with trimpots!

This is at least the second time this has happened. Another of our customers, a temperature sensor manufacturer, ran into exactly the same objection years ago and regularly offers our transmitters even though they also handle the European brand.

Do you need to change ranges but still like trimpots? Model JH225 (shown) adds switches that let you recalibrate to almost any practical range for thermocouple types J, K and T. (You do need a calibration source.) We also offer similar transmitters for RTD (resistance thermometer) sensors.

Links:
Model JH220, thermocouple 2-wire transmitter, fixed range (factory set)
Model JH225, thermocouple 2-wire transmitter, user-rangeable
Model JH240, RTD (resistance thermometer) 2-wire transmitter, fixed range
Model JH245, RTD 2-wire transmitter, user-rangeable

All 2-Wire Transmitters

Simple Specials

2010-02-06T15:25:00.000-08:00

Standard Product, Nonstandard Connections

Our OEM customer needed a fully compatible replacement for a thermocouple alarm module they once bought from England. Our Model JH1200 plug-in thermcouple alarm filled the bill, except the pin connections were different.

The answer was simple - take our standard product, unsolder the internal wires from the pins and rewire them to be the same as the British product. And, since the the connections to the thermocouple were changed, we also needed to relocate the temperature sensor used for cold junction compensation.

One more step - we made a simple adapter to allow the converted alarm module to plug into our standard production test and burn-in fixtures.

This customer buys only one or a few at a time, but they've become a regular for several years.

Links: Process Alarms
JH1200 Thermocouple Alarm
Custom & Special Signal Conditioners

Simple Specials

2010-02-04T17:33:00.000-08:00

SPECIAL ORDER -

SUM THREE UNEQUAL FLOWS

Flow #1: Full Scale (20mA) = 1.75 MGD (Million Gallons per Day)

Flow #2: Full Scale (20mA) = 22 MGD

Flow #3: Full Scale (20mA) = 1.04 MGD

Module Output: Full Scale (20mA) = 24.79 MGD

Something we do all the time - modify our products to meet out-of-the-ordinary needs. In this case the customer needed to add signals from three flowmeters, each having a different scale factor.

A bit of engineering calculation, followed by the selection of a few precisely-measured input resistors, did the trick.

One piece order. Turn-around time - four days from order entry to shipment.

Product Spotlight

2010-01-31T16:11:00.000-08:00

Two-Wire Transmitter -

Potentiometer Input

Our "sleeper" product - not new and, you would think, not particularly exciting, but people keep finding it and buying it, so we thought we'd feature it.

Pretty simple - takes a potentiometer input and converts it to a 4-20mA two-wire (loop-powered) output. Quite honestly, it was an afterthought when we designed our temperature (RTD and thermocouple) two wire transmitters years ago. Laying out the circuit board so it could also be assembled for potentiometer input was easy, so we included it.

Sells better than we ever expected. Just this month we picked up two new customers for it. The applications can be anything that needs to convert position to an electrical signal. A couple applications - level measurement and boat throttle position. The level measurement application uses a probe with series of resistors and reed switches, activated by a magnetic float.

Links: Model JH250 Potentiometer Transmitter
Other Two-Wire Transmitters
Our web site - http://www.jhtechnology.com/

Can You Help????

2010-01-08T07:40:00.001-08:00

Here's a question we can't help with. Can you?

The other day a fellow called to ask if we could build a custom dashboard panel for his car. We've had two similar calls recently - at least one of them was from a man who was converting an older model to electric power. (He wanted it to look as much like the original dashboard as posssible.) All of them had seen from our web site that we can design panels and minisystems.

This is outside our area of expertise. Industrial control panels, yes. Automotive, no. We'd need to know the size, shape, mounting arrangements etc of the car's dashboard and the electronic details of the car's sensors.

I thought I'd post this for our readers. Can you help, or do you know anyone who can?

Product Spotlight

2010-01-03T08:20:00.000-08:00

Field Mount Enclosures

In our last posting (December 26,2009) we highlighted our FDT5000 Series field mount transmitters with displays. If you don't need a display you can mount any of our plug-in transmitters and alarms in the two enclosures featured here.

NEMA-4X Rated Enclosure

Splashproof & corrosion resistant, it includes the mating socket. It is normally sold without an opening or conduit connection as the installer usually prefers to determine this detail. If you would like us to provide this please e-mail jhtek@jhtechnology.com or call 941-927-0300 (in the US, toll-free 800-808-0300) us with your requirements.

Part #ENCL-1-8 with 8-pin socket, or ENCL-1-11 with 11-pin socket.

Explosion Proof Enclosure

This is a Hubbell-Killark enclosure, modified by adding an 8- or 11-pin socket. UL, CSA and Factory Mutual approvals include Class 1, Div 1 & 2, Groups A, B, C & D when properly installed. A neoprene o-ring assures water-resistance per NEMA 4/IP66. Two 3/4 inch-14 NPT threaded conduit openings are provided.

Part #ENCL-EX1-8 with 8-pin socket, or ENCL-EX1-11 with 11-pin socket.

Product Spotlight

2009-12-26T07:25:00.000-08:00

Field-Mount

Transmitters

with Displays

Designed for outdoor and other wet/dirty environments, our FDT5000 series transmitters feature:

Splashproof/ Corrosion Resistant Enclosure per NEMA 4X
User-Rangeable 3-1/2 Digit Display
Wide Selection of Input Styles
Voltage or Current Output Ranges
AC and DC Power Options

For full information visit the Field Mount Process Transmitters section of our web site (www.jhtechnology.com/field_mount.htm).
If you don't need a display, we also offer NEMA 4X and explosion-proof enclosures for our plug-in transmitter and alarm modules.

Our home page: http://www.jhtechnology.com/

Signal Isolator Serves as Subtractor

2009-11-29T06:49:00.000-08:00

Measurement and control applications sometimes need a difference (A - B) calculation. Examples include:

Liquid level measurement in a closed vessel. Level is proportional to the bottom liquid pressure minus the top ambient (gas or air) pressure.
Liquid blending control. Must maintain a zero difference between two measured flow rates.
Relative speed control. Control for zero difference between two speed measurements.

JH Technology offers a complete range of multiple input add/subtract instruments, but when the inputs are voltages a lower-cost isolator may do the job.
The figure shows two voltages, both grounded. The signals may come from two pressure or flow transmitters, tachometers or other sources. The isolator's input is connected between the two positive voltages; thus, the input is (V1 - V2). Its output may be set to equal the differential input or it may be scaled up or down, offset or converted to a current signal such as 4-20mA.
We offer plug-in, DIN rail and field mount style isolators and transmitters.

Links: Add/Subtract Transmitter Modules
DIN-Rail style add/subtract transmitters
All Process Transmitters and Alarms

Simple Specials

2009-11-21T14:49:00.000-08:00

CUSTOM

MODIFICATION:

TWO INPUT RANGES

Our OEM customer, who manufactures level control systems, wanted to be able to interface more than one type of level sensor with his system. Specifically, he needed to translate both 4/20mA and 0/5 volt level signals to match his system's input.

Our solution - a modified version of our JH4300 DC Input Transmitter capable of accepting both ranges. For 4/20mA the input is connected to pins 5 & 6. For 0/5 volts pins 4 & 6 are used, plus a jumper between two terminals. This avoids the need to stock two different types of signal conditioners.

More detail. Their level system normally uses a variable resistance level sensor. (In fact, they are a regular customer for our resistance input transmitters.) 4/20mA or 0/5V is only occasionally required, so they did not wish to redesign the system's electronics. Their original request was, could we translate 4/20mA or 0/5 volts to a 0/90 ohm resistance? The answer was no, this would not be a simple modification.

Instead, they determined and we verified that their electronics passes a constant 2.5 mAdc current through the sensor. Thus, 0/90 ohms translates to 0/0.225 volts. We set up our output for this range.

Conclusion: they now are able to work with several types of level sensors without modifying their system. All they need to do is connect the level sensor to our module and connect the JH4300's output to their system's input.

If you have similar needs, please remember that we can make "simple" modifications without large engineering costs or minimum order requirements. To contact us e-mail jhtek@jhtechnology.com or phone (800) 808-0300 (outside the US, 941-927-0300).

Links: Custom & Special Process Transmitters
JH Technology Web Site: http://www.jhtechnology.com/

Just for Fun - Hallowe'en 2009

2009-10-30T15:49:00.000-07:00

HAPPY HOLIDAYS!!!!!

Created by Rick Maccani, our Technical Services Manager - with help from his wife.

For those of you who are "electronically challenged" the symbols are - - eyes=diodes, nose= capacitor, mouth equals resistor.

Special Modifications

2009-10-24T15:21:00.000-07:00

Rapid Increase, Slow Decrease

("Peak Picker")

We've done this for a few customers. The basic application - monitor the peak value of a repetitive signal.
The first application was on an automated machine which formed nail heads. We never saw the machine, but our understanding is that it would "whack" heads on the nails in rapid succession. The user needed to know and control the impact force - not each and every individual impact, but the "normal" or "average" impact. In other words, he needed to know that the machine was properly set.
As the sketch shows, the output rises quickly to the peak value but decays slowly. (Actually, the unit we built had more filtering than is shown in the illustration.) The output of our module smoothed and held the value of the peak impact force.
We've built a few variations on this theme. One had an adjustable decay time (reference - our special feature #X0098) and one had a fixed 3-second time constant (X0214). Right now we're quoting a unit which adds a polarity-insensitive "absolute value" function - both positive and negative peaks will produce a positive output.

Links: Custom & Special Signal Conditioners
Our complete signal conditioner line

Special Modifications

2009-10-24T15:07:00.000-07:00

Slow Increase, Rapid Decrease

Just the opposite of the "peak picker".

Application - Heating oven control.
The customer wanted to avoid rapid temperature increases and overheating and so wanted a "slow" filter on the control input. On the other hand, he required a rapid turn-off for fast shutdown. We were able to modify our transmitter's input stage to accomplish this.
(Reference - our special feature #X0251.)

Links: Special & Custom Signal Conditioners
Our complete signal conditioner line

New Product - Pulse Amplifiers

2009-10-10T07:29:00.000-07:00

New Product

Announcement -

Low-Cost

Pulse Amplifiers

We've added two new pulse amplifiers to our product line.

For tachometers, turbine flowmeters and other magnetic coil pickups: Model JH376.

Two channels in one 0.7 in wide case. Each output is jumper-selectable, either 5V pulses or open collector. Highly sensitive, but includes sensitivity adjustments to optimize performance in noisy environments.

To convert logic pulses: Model JH377.

Inputs are jumper-selectable, either 5V/TTL or open-collector/contact closure. Outputs are jumper-selectable, either 5V pulses or open-collector. Again, two channels in one case.

Both products operate from 7 to 24Vdc power and at temperatures from -40 to +80 degrees C (-40 to 176 deg. F).

Links: Pulse Amplifiers and related products
All JH Technology Signal Conditioners

Absolute Value Function

2009-10-03T16:21:00.001-07:00

Absolute Value -

with a difference

(Details on the application mentioned in our September 27 posting.)

A new customer had an urgent need for a signal conditioner (transmitter) with absolute value response. Searching the internet, he read our "Specials & Customs" page and found that we had done this before. His need was different, but we were able to help him.

For those of you who may not be familiar with the absolute value function, it simply ignores the minus sign. The previous special which he found on our web site took a -10 to +10 volt input and created a proportional 0 to +10V output. For example, inputs of either minus 7V or plus 7V created a plus 7V output.

The new customer's application needed a signal representing the temperature deviation from ideal. Ideal temperature produced a 12mA current signal. A deviation, whether positive or negative, required a positive-going output (see graph). At 12mA input the output should be zero percent (4mA). At either 4mA and 20mA (8mA deviation) the output should be 20mA (100%).

We were able to modify the earlier special to accomplish this. As mentioned in our Sept. 27, 2009 post we did some Thursday evening calculations, quoted and took the order on Friday, built 6 units on Saturday (yes - we added an expediting charge) and shipped Monday.

Let us know what we can do for you!

Links: Custom & Special Signal Conditioners
Our home page: http://www.jhtechnology.com/

Just for Fun

2009-09-30T16:46:00.000-07:00

Sign seen in Sarasota, Florida.

(Sorry - the phone number was distorted to prevent nuisance calls.)

Must it be returned in like-new condition?

Fast Response - Part 2

2009-09-27T15:19:00.000-07:00

Speedy - Part 2

(See August 16 for Part 1)

Part 1 announced fast-response instruments. This time we're promoting our fast response to customer needs.

Thursday afternoon: We received two urgent calls, two different customers, asking "can you do it" and "how fast"? One was for 10 pieces of a standard product; the other, 6 specials which required modest new circuit design. We were able to say "Yes" to both.

Friday morning: Received both orders.

Friday evening: Two of us (Rick & Harry) stayed late.

Saturday: Rick & Harry worked from about 8:00 until 2:45PM. Finished both orders.

Monday: Both orders shipped. (Of course, both customers paid expediting charges to cover our overtime.)

Details: The standard-product order (JH4001I RTD Transmitters) was from a Navy base. They had been using "Brand A" products but that company was not able to delivery quickly. They sent searching and found us on the web. We did not have any in stock either - so we worked the weekend!

The special requirement was for an absolute-value transmitter. (See our posting of October 3, 2009 for more detail.) We had done this before (as a special in 2001) but the detailed requirements were different on this time. Thursday evening calculations plus weekend assembly and test got the job done.

Conclusion: If you need action, call us.

(800) 808-0300 or (941) 927-0300. e-mail jhtek@jhtechnology.com

GSA????

2009-08-25T17:11:00.000-07:00

GSA - General Services Administration

One of our government customers (with the US Bureau of Reclamation) was disappointed he could not simply order one of our products through the GSA - told us we're making things difficult for him. Since we pride ourselves on making things easy - and of course would like more government orders - we've decided to learn how to get listed.

We've been approached by consulting companies who can get us started for several thousand dollars (more to follow???) but since we're small, we decided try it on our own first. If we then need help, at least we'll know the questions to ask!

We've learned on our own before, for the Navy. (See blog dated June 8, 2009.) Conquered WAWF (Wide Area Work Flow), CCR (Central Contract Registration), SBA (Small Business Administration) etc. A few headaches along the way, but we made it. And, free help was usually available via US government toll-free numbers.

(Personal comment: despite all the criticism we hear about government employees I've found the majority of them to be courteous and helpful, limited perhaps by the bureaucratic systems they work in.)

It looks like a good amount of help is available from the GSA. We're already signed up for a free GSA web seminar in September.

Stay tuned - or better yet, if you have some helpful hints, please let us know. (E-mail jhtek@jhtechnology.com, or just comment here, or US toll free 800-808-0300).

Fast Response

2009-08-16T08:22:00.000-07:00

Speedy!

OK - maybe you're expecting me to promote our fast response to your orders. (Sneaky how I worked that in!)
The real topic - fast-responding signal conditioners.
A few months ago a customer asked if we could provide frequency response to at least a few kilohertz for DC and load cell signals. Our standard circuitry could not. His quantity requirements were large enough that we designed a new circuit to meet his needs (3kHz minimum). We've since shipped his order. He tells it is working well in his application - heavy-duty shock testing. More recently another customer needed just three fast-response units which we now are able to easily supply.
We're working on the paperwork and documentation to turn this in to a standard catalog product line of DIN-rail mount transmitters. Look for it shortly.
Meanwhile, if you have high-frequency or fast-response requirements, please ask us. E-mail jhtek@jhtechnology.com or call (800) 808-0300 (US toll-free) or (941) 927-0300.

Link to Fast Response Process Transmitters

Extended Temperature Operation

2009-08-12T16:15:00.000-07:00

Too Hot? --- Too Cold?

Wouldn't you know - while this job was in progress we had another customer who needed to operate at high temperatures in a solar energy monitoring application. Same exact product (JH4380W), same exact solution. The extended temperature ICs support a temperature range of -40 to +85 degrees C (-40 to +185 degrees F).

We recently took an order (almost ready to ship as this is written) for 54 rangeable transmitters (JH4380W) to operate in environments as cold as minus 40 degrees (C or F - this is the one point on the temperature scale where both are the same). Our customer tells us the end destination is Russia. No great technological challenge - we simply built a run using extended-temperature ICs.

Link to our Specials & Customs page
Home page - all Process Transmitters & Alarms

Just for fun

2009-06-13T09:25:00.000-07:00

BLATANT NEPOTISM!

Harry again. No technology this week. Instead, I'm bragging about our older daughter's web site. Lisa is a full-time nurse but also very talented at sewing, quilting, cross-stitch etc. After a number of requests from friends she decided to turn it into a part-time, web-based business, Heatherfish Studios. Named after her daughter (our granddaughter) Heather, who swims like a fish.

Here are a few samples: a Tote Bag, a children's Crayon Roll and a set of Coasters.

Like JH Technology hers is a small business, flexible and she has fun with it. And, like JH Technology, special orders are no problem.

OK, enough nepotism. If you're interested -

www.heatherfish.com

Supporting the Navy

2009-06-08T16:17:00.000-07:00

The US Navy, directly and indirectly, represents about 15% of our business. Here's what we do for them.

Standard Products - we sell standard products to a major servicer/supplier to Navy ships and, sometimes, direct to the ships themselves. It's fun to get e-mails and satellite calls from ships, followed by orders for intruments to be delivered to places like Hawaii and Singapore.

They mostly use our plug-in style transmitter and alarm modules because they stay in place well with ship motion and vibration. The most common styles are temperature transmitters (temperature input, DC voltage or current output) and alarm trips, frequency to DC converters and DC to freqiuency converters. We've sometimes done beefed-up specials for best possible assurance that they will survive mechanical stress.

Custom Products - Several years ago we developed a pulse conditioner to meet Navy requirements. Its function - convert a pulse train of almost any amplitude and waveshape, from millivolts to over 100 volts, square wave, sine wve or other, and convert it to a clean, isolated 5V logic pulse output. We don't know the Navy's application, but they've ordered many through contractors over the years.

Minisystems - We often take one or more of our products, sometimes together with products from other companies, and create "Minisystems" to meet customer's unique needs.

This one took our standard RTD (Temperature - Resistance Thermometer Input) transmitter, added a cable and connected it to a display board that we normally use in our Field-Mount transmitters. The US Naval Air Warfare Center, Lakehurst, NJ, needed a number of these to amplify and display temperatures as part of a system to test and certify steam cylinders used to catapult airplanes from Navy aircraft carriers.

We discussed various enclosure styles, but the Navy personnel decided they would rather just buy the "innards" from us and design them into their test system. Must have worked - they later bought a second round.

Part of our first shipment, on overnight burn-in test.

For more on our customs and specials capabilities: www.jhtechnology.com/customs. Or, of course, call (800) 808-0300, (941) 927-0300 or e-mail jhtek@jhtechnology.com

Just for fun

2009-05-31T10:19:00.000-07:00

AFFORDABLE HOUSING!

Just for fun - actually from 2005 when house prices were escalating upward.

Our good friends in Charlotte had just signed for a new townhouse in Fort Mill, South Carolina. They took us to see the construction site and this is what we found on their lot.

Minisystem Controls Blending (Flow) Ratios

2009-05-25T07:02:00.001-07:00

A very simple "system", but it solved our customer's problem.

The need: our customer needed a simple way to control the blending proportion (ratio) between two pump flows. The user desired a ratio adjustable from 1:5 to 5:1, with the center of the adjustment range being 1:1.

The pump controller's input was a standard 4-20mA dc control signal (4mA produces zero flow, 2o mA produces maximum). Our system needed to take the input (flow #1), multiply it by the ratio and produce an appropriate 4-20mA output (flow #2).
The solution: our JH4410 multiplier module plus a 10-turn precision potentiometer. The JH4410 was modified so that input B was the potentiometer's position. (Input A was set up for standard 4-20mA input.) The output's 4-20mA signal was proportional to input A multiplied by the potentiometer position. Additional modifications created the desired dial settings - 1:5 (gain = 0.2) at zero turns, 1:1 at five turns and 5:1 (gain = 5) at 10 turns.
At the customer's request the system was mounted in a wall-mount industrial enclosure.
For other examples of our custom & Minisystem solutions visit www.jhtechnology.com/customs.

Thermistors for Temperature Measurement

2009-05-17T12:40:00.000-07:00

Thermistors for industrial temperature measurements? Sure - we just took a repeat order from an OEM customer (for instruments - we don't sell the thermistors themselves). So, I thought I'd write about them.

Let me identify myself - Harry Trietley, President & Chief Engineer. In the 1980s I worked at YSI (formerly Yellow Springs Instruments) who had once pioneered precision interchangeable thermistors. (They no longer make them - sold the product line off.) So, I had the opportunity to learn how to apply them. We now have two regular OEM customers.

You won't find thermistor info on our web site - maybe we should add it. For now, this blog is a start.

Thermistors are resistance thermometers but much different from RTDs (Resistance Temperature Detectors). RTDs are linear (approximately), wide range, relatively low sensitivity (about 0.4% per deg C) and increase with temperature. Thermistors are highly nonlinear, narrow range, high sensitivity and decrease with temperature (about 4% per deg C).

There are many types of thermistors - small, large, highly accurate, loose accuracy, many shapes. This blog is about NTC (Negative Temperature Coefficient) thermistors. There also are PTC (Positive Temperature Coefficient) thermistors that act more like thermal switches - increasing resistance rapidly in just a few degrees near the switching point. PTCs are not used for linear temperature measurement.

Precision NTC thermistors excel in moderate temperature, narrow range applications. They are very sensitive, and some have tighter accuracy specs than RTDs. One of our customers uses them in heating/air conditioning control; the other, precision measurements related to integrated circuit manufacturing processes. They also see wide use in medical and laboratory temperature measurement.

We have made simple adaptations of our signal conditioners (temperature transmitters) for use with thermistors. So far we haven't published standard spec sheets, but they are very similar to our other instrument styles. (See http://www.jhtechnology.com/).

If you have an application let us know. Each application is different as there are many thermistor types. We would need to start by knowing your measurement temperature range - also the thermistor type if you have chosen one yet. If not, we can help you find the right one. Probably best to ask for Harry.

e-mail: jhtek@jhtechnology.com, US phone (941) 927-0300 or toll-free (800) 808-0300.

Split 4-20mA Loops without a Loop Splitter

2009-05-10T06:21:00.000-07:00

Save money! Don't buy a loop splitter if you don't need one.

Users often specify dual-output 4-2omA current loop splitters in their systems. Common reasons include:

The need for an output boost to drive several loads at once.

The need to run independent isolated current loops to two different systems.

These needs often can be met with a less-expensive single-loop isolator. The diagram shows the basic idea - use the source transmitter to drive the isolator's input plus the first loop, then use the isolator's output to drive the second loop.

For our complete application note (pdf) click here , or visit http://www.jhtechnology.com/ and click on the Application Notes link.

Hello, visitors

2009-05-09T18:44:00.000-07:00

We've only just begun .... A brand-new blog.

JH Technology, Inc. is an electronics company - we manufacture instruments known as signal conditioners, used mostly in industrial measurement and control applications. What is a signal conditioner? It's an amplifier for measurement signals. Signal conditioners amplify and convert signals such as temperature measurement (thermocouples, resistance thermometers and thermistors), pressure, force and weight (strain gauges, load cells), position (potentiometers), speed and RPM (tachometer pulses) and others. We don't make the sensors themselves, but we amplify and convert their signals.

We're a small, engineering-driven company and have strong capabilities in specials and custom or OEM products. We're also a bit old-fashioned - we answer the phone instead of running you around in circles with voice mail. We're proud of our customer service. If you need application assistance, have odd requirements or just need fast delivery, give us a try!

More "blogging" to come. Meanwhile, if you're interested, please visit us at http://www.jhtechnology.com/. To learn more about our specials and customs capabilities, visit www.jhtechnology.com/customs.

Of course, feel free to call:

Toll-free in the US (800) 808-0300
(941) 927-0300.