Custom & OEM Products


JH Technology's measurement expertise extends beyond our catalog product line, including such areas as flow, conductivity, pH, LVDTs and humidity. We're able to modify our standard product designs, to create short-run prototypes or design, tool and run full custom designs. And, we usually won't require a major commitment. For projects that fit our overall expertise we often can do the job with only modest engineering charges and production quantities.

For OEMs we can do anything from private-labeling our standard product to complete custom designs.

Here are some custom designs we've done. To discuss your unique needs, please contact us.

4-Input Load Cell Amplifier. A major new design for an OEM customer. This transmitter board provides an output proportional to the sum of four load cells. Unlike many other devices, it provides four individual input channels which may be balanced (offset and gain adjusted) without any cross-channel interaction. Its physical and electrical design is unique and exclusive to this customer, but we can design others to meet your requirements.

Low-Cost Thermocouple Amplifier. A temperature sensor manufacturer needed a small, low-cost thermocouple amplifier in OEM quantities for a major project. We designed and built a simple board assembly per their specifications.
High-Current Driver. This plug-in transmitter module provides plus and minus voltage or current outputs at up to 250mA. We're in the process of converting this to a standard product, JH4010DR.
Custom Curve-Matching Transmitters. Originally designed for a specific application, we have the capability to match curves using a 5 line-segment approximation. We've assigned it the generic Model No. JH4155 and designed several others since, but each is unique.
Adjustable Filtering. Designed for one customer and since sold to others, this design provides analog filtering with an adjustable time constant (63% response time) from 0.1 to 30 seconds. Originally designated as a special, we now call it Model JH4580.
Miniature Signal Filter. The customer needed to filter a number of industrial process signals and wanted as small an enclosure as possible. We designed a DC-powered filter in our two-wire transmitter enclosure. We now make it available to others as Model JH10185.
Differential RTD Input Transmitter. Two RTD (resistance thermometer) inputs. The transmitter's output is proportional to their difference. Narrow spans only.
Thermistor Inputs. We once included thermistor-input transmitters and alarms in our standard product line but removed them for lack of sales. Sure enough - shortly after we removed them we had two customers needing them - one on a repeat basis. We also can handle inputs from integrated circuit temperature sensors.
Tachometer Pulse Amplifier. This small, low-cost DC powered pulse amplifier was designed for an OEM customer but is available to others. Model JH10159.
Pulse Isolator/Conditioner. This high-end, high-capability product is usable with pulse amplitudes as low as 10mV and as high as 250Vac rms, and with frequencies up to 30kHz. Input/output isolation is standard. We're in the process of turning this into a standard product - Model JH10205
Phase Imbalance Detector. Not quite what it sounds like. Our customer needed to compare the signals coming from three current transformers (CTs) having 4-20mAdc outputs. The application was, three banks of heating lamps. If one lamp burned out the phase currents would become unequal. Our instrument compared the three and tripped a relay if they became imbalanced by more than a preset percentage.
Miniature Differential Thermocouple Amplifier. The application - monitor aspects of rocket performance during launch. Hardly "industrial", these flew on commercial satellite-launch rockets. This one-time project was designed to meet size, temperature and fast response requirements. We located a small die-cast enclosure, laid out a custom board and added a miniature connector per the user's requirements.
Tone Telemetry Encoder. Translates high/low input switch contacts to a high/low tone for transmission over a leased telephone line. The application - remote monitoring of sewer lift stations. Originally designed by City of Tampa technicians, we cleaned it up and repackaged it as a plug-in module and now build it for them. Model JH10120 - available for general sale.
High Impedance Electrode Buffer. A precision unity-gain voltage buffer with 100 megohms input impedance. The application - measurements from an electrochemical sensor. Available for general sale - Model JH10061
12Vac "Power Supply". Probably our simplest ever. The customer needed a 115Vac to 12Vac transformer housed as a plug-in module. We did it.