Product Focus - Pulse Conditioner

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

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

• 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

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

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

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!

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

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

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 - - -

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

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.

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

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

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

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

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

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

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?

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

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