RH-2-1-MR sensor

RH-2-I MR
Relative Humidity Transmitters

The RH-2 and RHT-2 are designed for continuous monitoring of relative humidity (RH) or relative humidity and temperature (RHT). The units feature very low profile sensor enclosures that are virtually unnoticeable in most installations.

The RH-2-I-MR Series is available with ±2% RH accuracy (20% to 95% RH). For monitoring and controlling in critical environments, the units can be precision calibrated to 1% accuracy within a specified RH range.

The RH and RHT transmitters provide a linear output of 4-20mA corresponding to 0 to 100% RH. The RHT transmitter also provides a 4-20mA signal corresponding to any of the selected standard temperature ranges specified.

The relative humidity and temperature sensors are housed in heavy duty, compact, locking enclosures. Enclosures may be removed and painted, which further helps blend them into any environment. The sensor enclosure is remotely mounted up to 50 feet from the transmitter.

The RH sensor incorporates a bulk polymer resistive element. The polymer is impervious to most contaminants and, since it is a bulk resistive device, surface contamination such as dust will not alter the accuracy of the readings. Imbedded in the polymer is an interdigitated grid which sense resistance change as the polymer absorbs or emits molecules of water.

Mounted remotely, the electronics are contained in a rugged pressure-cast aluminum weatherproof housing designed for maximum protection. Continuous temperature compensation adjusts for temperature-induced change in the RH sensor output. The compensation provides high measurement accuracy over the entire operating range of the instrument.

Features

Low Profile

Compact Sensor Enclosure

Replaceable, Plug-in Bulk Polymer Resistance RH Sensor

Resistant to Contamination

Temperature Compensation

SPECIFICATIONS

Humidity:

Sensing Element: Resistance change of bulk polymer sensor.
Accuracy at 77°F (25ºC): +/- 2% RH. 20-95% RH including hysteresis, linearity, and repeatability.
Temperature Effect: Less than 0.06% per ºF (Less than 0.11% per ºC)
Sensitivity: 0.1% RH
Repeatability: 0.5% RH.
Linearity: See Accuracy.
Hysteresis: Lessthan 1%
Sensor Interchangeability: ±3% nominal
Operating Range:
RH Sensor: 0% to 99% RH, non-condensing, -40º to +170ºF (-40º to 76ºC)
Electronics: 0% to 95% RH, non-condensing, -40º to 54ºC (-40º to +130ºF)
Max. Air Velocity: 10,000 ft/min
Output Ranges: 4-20mA current, 2-wire, isolated, loop-powered for 0-100%, RH (standard) into 0-900 ohms

Long Term Stability: Less than 1% drift per year typical
Supply Voltage: 12-36 VDC
Storage Temperature: -65º to +70º (-85º to +158º).

Temperature:

Sensing Element: Platinum RTD, 4 wire measurement.
Accuracy at 25º C: +/- 0.3º (+/- 0.5º).
Temperature effect: Less than 0.02% per ºC (0.01%ºF)
Sensitivity: 0.1% RH
Repeatability: 0.1% RH
Linearity: Better than 0.1%
Hysteresis: Less than 0.01%
Sensor Interchangeability: ±0.3ºC (±0.5ºF)
Output Ranges: 4-20mA, 2-wire, isolated, loop powered. Standard: -29ºC to +60ºC (-20ºF to 140ºF)
Long-term Stability: Less than 1ºF drift per year typical.

Applications

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