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RHCM-40
Optical Chilled Mirror Dew Point Transmitter
- 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
Product Overview
- Accuracy ± 0.2 °C (± 0.36 °F)
- Additional Features 1 For Dew Point - 2 stages of cooling (TEC) with a depression of 60°C; Standard Chrome Plated Mirror
- Cable Length 3 m
- Cable Length, Max 15.2 m
- Data Interface RS232
- Dew Point Temperature, Max 60 °C
- Dew Point Temperature, Min -40 °C
- Electrical Output 4 to 20 mA, 0 to 5 Vdc, 0 to 10 Vdc
- Height 130 mm
- Hysteresis Negligible
- Length 76 mm
- Linear Flow Rate, Max 3000 FPM
- Current, Max 1 A
- Output Detail 4 to 20 mA: 0 to 250 Ω 0 to 5/10 Vdc: 1 kΩ or higher
- Pressure Limits Up to 100 psi
- Pressure, Min 0 psi
- Pressure Note 100 psig maximum (higher pressure available on special order)
- Relative Humidity 1 to 95%
- Repeatability ± 0.05°C
- Response Time 1°C/second not including settling time
- Supply Power Type DC
- Supply Voltage 24 Vdc
- Temperature Measurement, Max 60 °C
- Temperature Measurement, Min -40 °C
- Weight 1.4 kg
- Width 130 mm
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.
Specifications
Range:
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)
Load:
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
Mirror:
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")
Specifications
Range:
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)
Load:
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
Mirror:
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")
PDFs & Manuals
Show Ratings & Reviews
Is there an option to add a LCD display to the front of the enclosure?
Thank you for the inquiry. Unfortunately we do not currently offer integrated display with this model.
Best regards
OMEGA
Date published: 2023-02-12
Where can I find the manual for the RS232 serial protocol (Messages to send, message format, etc.)?
The protocol for the RHCM does not seem to be readily available so send a request to temp@dwyeromega.com and an effort can be made to find it.
Date published: 2024-11-20
Is there a way to place a NIST traceable temperature next to the element to calibrate it. We need six month field calibration.
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.
Date published: 2020-12-03