User`s guide

Chapter 4 ______________________________________________________________ Maintenance
VAISALA______________________________________________________________________ 155
Pressure Sensor
Periodic Maintenance
Under normal operating conditions, PMT16A needs only a minimal
amount of maintenance.
- Keep the pressure port clean. Check the pressure port every time
when visiting the site.
- Annually, compare pressure values against a calibrated portable
standard.
Calibration
The MAWS software provides means for one-point field calibration of
the PMT16A sensor.
Required equipment:
- Laptop PC with a terminal software
- Travelling standard barometer (for example Vaisala PTB220TS)
- Terminal cable QMZ101 (included in the MAWS delivery).
Calibration procedure:
1. Establish terminal connection to MAWS by connecting the
terminal cable to the COM0 port of MAWS and to an available I/
O port on your PC.
2. Place both pressure sensors at the same level.
3. Read the reference barometer reading.
4. Give this reference reading to MAWS.
Type: PMT16CAL 1003.7 (reference reading 1003.7 hPa)
NOTE
Make sure that the wind does not interfere with the reading of the
reference barometer.