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RH+T Transmitter


SC804 is a high-performance 2-wire Relative Humidity and Temperature (RH+T) Transmitter for use in hazardous environments. With its integral relative humidity and temperature sensor, the transmitter is inside a surface-mounted flameproof (certified for gas groups I, IIA, IIB and IIC) enclosure with an IP66 rating; completely dust proof and can withstand temporary flooding. Remote external sensors, SHT20, SHT30 (wall-mount) and SHT40 (duct-mount), may be placed as far as 25 meters from the unit. SC804 has a dual LED display visible through the flameproof enclosure; the upper indicates relative humidity and the lower indicates temperature. This transmitter is accurate to 2% for relative humidity and within 0.3 °C for temperature. The operator calibrates Zero and Span for SC804 on the front of the unit via membrane keys. SC804 transmits two isolated output signals to other devices such as a Programmable Logic Controller (PLC) or Solid-State Relay (SSR). Signal isolation protects your devices and machines downstream of our instruments from damaging fluctuations in the input signal. SC804’s microcontroller technology linearizes the input which makes control more effective. It is powered by a 11.5 - 32 V DC loop supply.

  • Accuracy : ± 2% RH, ± 0.5 °C
  • Low loop drop: 11.5 - 32 V DC loop supply
  • 2 x 4-20 mA outputs
  • Software calibration - no trimpots
  • IP66, rugged construction
  • Surface mount


  • humidity measurement



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