- Trained on our vast library of engineering resources.

Custom Relative Humidity Transmitters

Featured Product from Thermalogic Corporation

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HumiSense® Transmitter Line
Relative Humidity Transmitters (Analog and Digital)


  • Rugged epoxy encapsulation
  • Open PC Board
  • Voltage, current, or digital output
  • Optional dust filter
  • Individually point calibrated
  • Combination humidity, temperature transmitters available
  • Threaded or wall box mount
  • High quality at low cost


Design Library
Over 50 years of technology means a starting point for you.
With over 50 years of experience, we’re never really starting from scratch. Our product platforms often provide a cost-effective starting point for our new customers. See your needs inside these specifications? Take a look, and then let’s talk to discuss specifics.

At Thermalogic, we’ve designed and manufactured millions of controls and sensors. Many of them have features in common — so we trademarked them for efficiency’s sake! These product platforms of controls, sensors and transmitters are the foundation for your project.

Whether your needs fall into one of these categories or not, we can work from your drawings, sketches, descriptions, ideas or obsolete product to meet your exact needs. Either way, we bring a wide variety of proven technologies and a track record of excellence to meet your needs and exceed your expectations.

Control Platforms

  • TempGuard® Analog: An extensive line of non-indicating, rugged analog controls from single zone to multiple zone controls.
  • TempGuard® Microprocessor: Non-indicating microprocessor based controls for more complex applications where more elaborate computing power is required.
  • DigiTherm®: Indicating microcontroller based controls where a visual indication is necessary.
  • Master Series®: Elaborate multi-zone microcontroller based controls for demanding applications where many parameters and application specific processes may be controlled simultaneously in a single package.


Sensor and Transmitter Platforms

  • Temperature Sensors: Built to order RTD, thermistor, and thermocouple probe assemblies.
  • HumiSense®: Relative Humidity Transmitters (both analog and digital)
  • SureSignal®: Temperature and humidity signal conditioners and transmitters fit for industrial use.


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Thermalogic: Over 50 years of built to order controls and sensors, with satisfied customers at every turn.
At Thermalogic, we design, engineer and manufacture electronic temperature, humidity and process controls and sensors — so you can have the built-to-spec accuracy and reliability you need.

Since 1971, we have been working across a variety of industries to ensure top-quality, built-to-order controls plus a partnership that makes life easy. The full range of Thermalogic® services is performed in-house, right here in our state-of-the-art facility in Hudson, MA, where we bring family-owned values and commitment to everything we do.

Why us?

  • We have over 50 years of satisfied customers.
  • All units are 100% tested prior to shipping.
  • Our process makes working together easy.
  • Our qualified sales engineers are skilled at understanding and addressing your exact needs, no matter how intricate.
  • Great turnaround times: Custom design doesn’t mean long waits.
  • Partnership throughout means we even help you stay on top of your inventory.
  • Everything we make is high-quality, rugged, reliable, industrial-grade — and backed by our warranty and partnership.
  • Cost-effective: Over the years, we’ve trademarked a design library of proven technologies that may serve as a starting point for your project.