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EHRH
Amphenol
®
Waterproof RH Transmitter
The 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.
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
Advanced Sensors
• Hospital suites
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EHRH Specifications
Amphenol
Humidity
Sensing Element
Resistance change of bulk polymer sensor
Accuracy at 77°F (25°C)
±2% RH. 30 to 95% RH including hysteresis, linearity,
and repeatability.
Temperature Effect
Less than 0.11% per ºF (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, -20ºC to 54ºC (-4ºF to 129ºF)
Maximum Air Velocity
10,000 ft/minimum (3,048 m/minimum)
Output Ranges
4 to 20 mA current, two-wire, loop-powered for 0 to
100%, RH (standard) into 0 to 900 Ω
Adjustment
Zero
±20%, non-interactive
Span
±10%, non-interactive
Long Term Stability
Less than 2% drift per year typical
Power Supply
Voltage
12 to 36 VDC
Wiring Connection
Deutsch four-position waterproof connector (For front
wiring only_flying leads for back wiring).
Temperature
Sensing Element
Thermistor, 10 KΩ at 77°F (25ºC), two-wire
measurement
Accuracy at 77°F (25ºC)
±0.5ºF (±0.3ºC). Also available with 100 (RTD with 4 mA
to 20 mA analog output.
Consult factory for further information
Part Number Configuration
Order
[1]-[2]-[3]-[4]
Codes:
1 Model Designation
EHRH-2 Relative Humidity and 10K thermister outputs
EHRHT-2 Relative Humidity and signal conditioned temperature
2 Output(s)
I Current (4-20mA) EHRH and EHRHT
V5 Voltage (0-5 VDC) EHRH only
V10 Voltage (0-10 VDC) EHRH only
3 Wiring
F Front, with waterproof connector
B Back, flying leads
4 Temperature Channel Range (EHRHT Only)
1 -20°F to +140°F Temperature Rage (Standard Range)
2 0°F to +150°F Temperature Range
3 0°F to 100°F Temperature Range
4 +32°F to +132°F Temperature Range
5 +50°F to +130°F Temperature Range
6 -40°F to +140°F Temperature Range
7 Custom Temperature Range
Example: EHRH-2-V5-F
outputs
RH transmitter with 10K thermistor, 2%
accurate RH, 0-5 volt RH output and front-wired
(waterproof connector).
All units have a standard 3-Point factory
calibration (30, 50, 80% RH @ 25°C) standard
relative humidity output range is 0 to 100%.
Standard temperature output range is –20°F
to +140°F. Standard relative humidity and
temperature output signal is 4-20 mA.
Advanced Sensors
www.telaire.com
www.amphenol-sensors.com
© 2014 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice.
Other company names and product names used in this document are the registered trademarks or
trademarks of their respective owners.
AAS-920-233D-03/2014
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