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 |