Optical Chilled Mirror Dew Point Transmitter

RHCM-40 Series

Dew Point Transmitter | Gas Moisture Meter

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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
Long-Term Stability and Repeatability
RS232, Bi-Directional, Serial Output
Electronics Housed in IP65 Enclosure (Wall Mount)
Aluminum Housing for Other Configurations
2 Analog Outputs (4 to 20 mA/0 to 5 Vdc to 0 to 10 Vdc Selectable) Optional Features
Air Temperature and Humidity
2 Line LCD (Graphical Display with 3 Parameters Displayed at One Time)
AC Universal Supply 85 to 230 Vac
Flow-Through Sample Chamber U High Pressure (20 bar)

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Description

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")

† All amounts shown in EUR, GBP, or USD
Note: Comes complete with two stage chill mirror sensor (insertion probe style, 60°C depression), 24 Vdc input power, 2 selectable analog outputs, RS232 (bi-directional), two programmable alarm relays, operator’s manual and NIST certificate.