This manual introduces the features, characteristics and usage of Vaisala DMT242 dew point temperature transmitter.
The DMT242 is a low‑dew‑point temperature transducer designed for industrial process applications. It provides stable dew‑point measurements with an automatic correction function and a robust DRYCAP sensor that recovers quickly after drying.
The manual explains how to install the unit, connect the wiring, set the pressure switch, perform calibration and maintenance, use the RS‑232 serial line for analog‑output scaling, and lists available accessories and technical specifications. This manual is written in Japanese.
| Measurement range | -80 °C … +602 °C |
|---|---|
| Analog output | 4 mA … 20 mA |
| Output resolution | 0.002 mA |
| Maximum current consumption | 220 mA @ 24 VDC |
| Maximum load on output | 300 Ω |
| Default pressure setting (factory) | 1 bar (switch 4 ON) |
After power‑up, wait 7 minutes before the measurement becomes available.
Calibration or checking should be performed every 2 years.
Connect via RS‑232 and send the command "ascl xx yy