Dewpoint hygrometer with chilled mirror type CMH-20

Product description

CMH-20 is a precision microprocessor-based meter using a chilled mirror to measure the absolute humidity of gases. The measurement is based on the definition of the dew point. CMH-20 has user-friendly interface and a large clear graphic display.
Inside the measuring head is a gold plated copper mirror chilled by a two-stage Peltier, precision resistor Pt100 measuring the temperature on the surface of the mirror and an optical detection system. Condensation of dew on the surface of the mirror is indicated by an the optical system.

Technical data


Measuring range -30÷60°C dew point
Dew point temperature accuracy ±0.2°C
Gas temperature accuracy ±0.1°Cy
Units of measurement °Cdp, °Fdp, %Rh, gm-3 , ppm(v),°C,°F, T-Tdp
Resolution 0.1 lub 0.01 for °Cdp, °Fdp, %Rh,°C,°F, T-Tdp
Analog output two channels 4-20 mA or 0-20 mA referenced to common ground, programmable
Alarm output two channels, SPDT relay contacts, 5 A, 250 V AC / 24 V DC
Interface RS-232, (RS-485 on request), USB
Standard power supply 85÷264 V AC / 47÷440 Hz, 15 VA
Low voltage power supply, optional 9÷36 V DC, 15 W
Ambient temperature -10÷40°C
Dimensions (w x h x d) / weight 268 x 85 x 200 mm / 1.4 kg
Case material aluminum
Ingress protection IP20
Gas temperature sensor (standard) PT100, 1/3 DIN, 4-wire, type TP-361 3x60mm, 2 meters long wire


Measuring head
Protective filter stainless steel net, PTFE membrane
Mirror copper, gold plated
Mirror temperature sensor Pt100, 1/3 DIN, 4 – wire
Maximum gas flow 10 m/s
Maximum working pressure 0.1 MPa
Process connection M36 x 1,5
Ingress protection IP65
Dimensions / weight 60 x 60 x 173 mm / 0.52 kg
Długość przewodu przyłączeniowego 3, 5, 7 m

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Delivery time is 2-7 business days