• LCD indications for current and voltage models
  • Temperature options available
  • Highly stable RH sensor element
  • Integral zero and span adjustments
  • 4-20mA, 0-5 VDC, 0-10 VDC outputs
    (factory configured)
  • Accuracy ?% to ?%
  • Humidity span 0% to 100%
  • Modular design allows several
    option configurations
  • NEW functional and attractive
    enclosure
  • Temperature compensated
  • Fast response


The RH series transducers are intended specifically for use in environmental monitoring and control systems and comes in a variety of enclosures. Its state-of-the-art design combines microprocessor based linearization and temperature correction with a world class capacitance sensor. Reliability and accuracy for even the most critical of measurements.

Excellent long-term stability and quick response time combined with temperature compensation make the RH series transducers an ideal choice in the HVAC market. Various models offer accuracy within 2%, 3%, or 5%.

The RH100 Wall Mount comes in a very compact enclosure which mounts directly to a single electrical box. Temperature sensor options of RTD's and thermistors are available.


4-20mA Loop Power Supply 18 to 35 Vdc or 18 to 32 Vac (with 250 ohm load and no LCD) 22 to 35 Vdc or 22 to 32 Vac (with 250 ohm load and LCD)
Minimum Loop Current 2.5 mA nominal
Maximum Loop Current 21.5 mA nominal
Maximum Loop Load >600 ohms at 24 Vac/dc with no LCD, > 325 ohms with LCD
0-5 Vdc Power Supply 10 to 35 Vdc or 10 to 32 Vac, 15 Volts minimum with LCD
0-10 Vdc Power Supply 15 to 35 Vdc or 15 to 32 Vac
Voltage Mode Maximum Current <3 mA with no LCD, 15 mA nominal with LCD
Voltage Mode Maximum Output Limited to < 5.5 Vdc for 0-5 model and < 10.5 Vdc for 0-10 model
Input Voltage Effect Negligible over specified operating range
RFI Rejection Good RFI rejection of normal frequencies with standard installation
Protection Circuitry Reverse voltage protected and output limited
Output Signal 4-20mA current loop, 0-5 Vdc or 0-10 Vdc (factory configured)
System Accuracy at 25C ?, 3 or 5% RH, 5 to 95% RH
Temperature Dependence ?% RH from 0 to 40C and 5 to 95% RH, maximum
Repeatability ?.5% RH typical
Hysteresis ?% RH maximum
Linearity ?.5% RH typical
Sensor Response Time 15 seconds at 25C in slowly moving air
Stability ?% RH typical at 50% RH in 5 years
Sensor Type Thermoset Polymer based capacitive
Display Units % RH
Display Range 0 to 100% RH
Display Resolution 0.1% RH for display of 00.0 to 99.9
Display Accuracy ?.5% RH over full range with respect to the output signal
Display Update Rate 3 times per second
Display Size 0.95"W x 0.45" H (24mm x 11mm) three digit
Operating Temperature 0 to 70C (32 to 158F)
Operating Humidity 0 to 95% RH (non-condensing)
Wiring Connections Screw terminal block (14 to 22 AWG)
Manufacturing Process ISO 9002 Certified
Internal Adjustments Clearly marked ZERO and SPAN pots
Enclosure Size 2.8" W x 4.7" H x 1.25" D (71mm x 119mm x 32mm)
Optional Slidepot 20 - 30K (L-R) standard, other values available
Optional Switch Normally open pushbutton, 0.4 VA at 24 Vac/dc standard