This user guide provides installation, wiring, calibration, and maintenance instructions for the Vaisala DMT242 OEM dew point transmitter.
The Vaisala DMT242 is an OEM dew point transmitter utilizing patented automatic calibration technology and DRYCAP film sensor technology. It features a mechanical design suitable for harsh environments with dust, dirt, and water splashes, offering easy wiring via signal and power terminals as well as serial port output for adjusting analog ranges.
This manual covers pressure range settings using DIP switches, installation steps including the G1/2" ISO228-1 threaded probe, and 3-wire cable connections. It also details maintenance procedures such as replacing sintered filters, on-site calibration methods using a DM70 handheld instrument, and adjusting analog output ranges via RS232 serial commands. This manual is written in Chinese.
| Measurement Range (Option A) | -80 ...+20 °C |
|---|---|
| Accuracy (DRYCAP 180M) | ±2°C |
| Operating Voltage | 17-35VDC / 20-28VDC |
| Power Consumption (at 24VDC) | Max 220mA |
| Probe Thread Size | G1/2" ISO228-1 |
| Protection Rating | IP65 |
| Response Time (Low to High) | 5 s [10 s] |
It is suggested to perform calibration every two years.
You can use the serial command 'ascl xx yy' where xx is the low limit and yy is the high limit.
The settings are: Baud rate 2400, No parity, 8 data bits, and 1 stop bit.