EHRH RH Transmitters

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Features

	Waterproof Sensing Element and Housing
	Compact Transmitter with Built-in Sensor
	Bulk Polymer Resistance RH Sensor
	Resistant to Contamination
	Thermistor Temperature Measurement
	Temperature Compensation

Applications

	Greenhouses
	Textile Mills
	Food Processing
	Shipping Containers
	Swimming Pools
	Hospital Suites

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EHRH Waterproof RH Transmitter

EHRH Waterproof RH Transmitter

The Model EHRH Relative Humidity Transmitter is a waterproof RH sensing element and package which is ideally suited for monitoring relative humidity in high RH/harsh environment applications or where washdowns are required. The unit is designed for continuous monitoring of relative humidity and temperature and is available in +/- 2% accuracy.

Both the sensor and electronics are contained in an epoxy-hardened enclosure designed for continuous service. A water-tight membrane filter is installed over the RH sensor for increased protection against high RH, contaminants and washdowns. The unit is designed to withstand 100% saturation.

The sensor incorporates a bulk polymer resistance element. The polymer is impervious to most contaminants and, since it is a bulk resistance device, surface contamination such as dust will not alter the accuracy of the readings.

The unit is provided with continuous temperature compensation which adjusts for temperature-induced change in the RH sensor output. The compensation provides high measurement accuracy over the entire operating range of the instrument.

SPECIFICATIONS

Humidity:

Sensing Element: Resistance change of bulk polymer sensor.
Accuracy at 77°F: +/- 2% RH. 30-95% RH including hysteresis, linearity, and repeatability.
Temperature Effect: Less than 0.11% per ºF (Less than 0.06% per ºC)
Sensitivity: 0.1% RH
Repeatability: 0.5% RH.
Linearity: See Accuracy.
Hysteresis: Less than 1%
Operating Range, Sensor & Electronics: 0% to 100% RH, -20ºF to 54ºF (-4ºC to +129ºC).
Max. Air Velocity: 10,000 ft/min
Output Ranges: 4-20mA current, 2-wire, loop-powered for 0-100%, RH (standard) into 0-900 ohms.

Adjustment:

Zero: +/-20%, non-interactive
Span: +/-10%, non-interactive
Long Term Stability: Less than 2% drift per year typical
Power, Supply Voltage: 12-36 VDC
Wiring Connection: Deutsch 4-position waterproof connector (For front wiring only - flying leads for back wiring).
Storage Temperature: -65ºF to +70ºF (-85ºC to +158ºC).

Temperature:

Sensing Element: Thermistor, 10K ohm at 25º, 2 wire measurement.
Accuracy at 25º C: +/- 0.5ºF (+/- 0.3ºC). Also available with 100( RTD with 4-20mA analog output.