DMT242 is a dew point measuring sensor for a variety of OEM applications from 德玛格. It also measures dew point over a long period of time with excellent stability, which is ensured by the patented auto-calibration process. The technology used in this sensor with the polymer thin-film sensor DRYCAP is also resistant to condensation, which can form condensation in the process in the event of a malfunction in the system. The mechanics are designed for harsh environments that require protection from dust, dirt and splashes. The sensor can be easily disconnected and reconnected via a plug connection that includes the output signal and power supply wires. The DMT242 is also equipped with a serial interface for maintenance purposes.
This manual describes the operation, installation, and maintenance of the Vaisala DMT242 DRYCAP dewpoint meter. It includes guidance on pressure settings, RS‑232 communication, and measurement principles for accurate dew‑point determination.
Technical specifications such as measurement range, accuracy, output signal, power requirements and RS‑232 settings are listed, along with contact information for Vaisala service centers worldwide.
| Measurement range | -80 °C to +60 °C |
|---|---|
| Accuracy | ±2 °C |
| Output current (per °C) | 0.0008 mA/°C |
| Power supply (DC) | 24 VDC max 220 mA |
| Power supply (AC) | 20 V to 28 VAC |
| Relative humidity range | 0 % to 100 % RH |
| Pressure range | 0 bar to 20 bar |
The DMT242 measures temperatures from –80 °C up to +60 °C.
The RS‑232 port uses 2400 baud, 8 data bits, no parity.
It can be powered from 24 VDC (max 220 mA) or from 20 V to 28 VAC.