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Optical Chilled Mirror Dew Point Transmitter


Item# RHCM-40-PL-W

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 C$4,602.03
5-9 C$4,371.93
10-24 C$4,279.89
25-49 C$4,095.81
50-99 C$4,003.77
100+ C$3,911.73

In stock

Lead Time (If not in stock): 6 weeks
Optical Chilled Mirror Dew Point Transmitter RHCM-40-PL-W RHCM-40-PL-W
  • Wall, Duct and Pipe Mount Models
  • Remote Type Models
  • 4-Wire RTD Measurement for Dew Point
  • ±0.2°C Accuracy for Both Dew Point and Temperature

RHCM-40-PL-W Model Options

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Input Type
Input Ranges
Output Type
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Supply Voltage Type

The RHCM-40 Series dew point transmitter is an optical chilled mirror high performance hygrometer designed to continuously measure the moisture content in gases. The sensor provides accurate long term repeatability and high reliability performance for process control and energy management. The instrument is powered by 24 Vdc or optional AC universal supply 85 to 230 Vac. The RHCM-40 series uses the chilled mirror dew point temperature condensation principle to determine the water vapor concentration in gas mixtures, and a platinum resistance RTD to accurately measure that temperature. Options include air temperature and humidity measurement. There are two selectable analog outputs which include 4 to 20 mA, 0 to 5 Vdc, or 0 to 10 Vdc and an RS232 serial port as well as electrically isolated relay contacts.

Dew Point (Standard): -40 to 60°C (-40 to 140°F)
Air Temperature (Optional): -40 to 60°C (-40 to 140°F)
RH (Optional): 1 to 95%
Accuracy: ± 0.2°C for both dew point and temperature
Hysteresis: Negligible
Repeatability: ±0.05°C
Response: 1°C/second not including settling time
Flow Rate: Static to 3000 linear feet/minute
Pressure: 100 psig maximum (higher pressure available on special order)
Analog Outputs: 2 analog ouputs (4 to 20 mA/0 to 5 Vdc to 0 to 10 Vdc selectable)
4 to 20 mA: 0 to 250 Ω
0 to 5/10 Vdc: 1 kΩ or higher
Relay Outputs: 2 programmable alarm relays
K1: Clean mirror/Alarm 1
K2: Servolock/Alarm 2
Contact Rating: Normally open (NO) 3 A at 25 Vac, or 30 Vdc
Remote Cable Configuration:
Dew Point: 3 m (10') standard, 15.2 m (50') maximum
Air Temperature (Optional): 3 m (10') standard, 15.2 m (50') maximum
For Dew Point: 2 stages of cooling (TEC) with a depression of 60°C
Standard: Chrome plated
Optional: Gold or platinum
Power Supply: 24 Vdc ±20%, 1 A maximum
Weight: 1.4 kg (3 lb)
Electronics Module Outside Dimensions: 130 H x 130 W x 76 mm D (5.1 x 5.1 x 3")
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Is there a way to place a NIST traceable temperature next to the element to calibrate it. We need six month field calibration.

Asked by: dbingamon
Thank you for your inquiry. This device comes with a NIST Traceable Calibration Certificate. You would need to have the unit re-calibrated by OMEGA or an outside calibration lab ONLY.
Answered by: CB Engineer
Date published: 2020-12-03

Is there an option to add a LCD display to the front of the enclosure?

Asked by: MG90
Thank you for the inquiry. Unfortunately we do not currently offer integrated display with this model. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2023-02-12
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