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User's Guide ______________________________________________________________________
174 __________________________________________________________________M210630EN-B
As the D (dry) and W (wet) adjustments may affect each other, recheck
the humidity reading at the low end. If necessary, repeat the adjustments
in both the low and the high humidity points, until the reading is correct.
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).
Table 22 Greenspan’s Calibration
Temperature [°C] 15 20 25 30 35
LiCl [%RH]
1
11.3 11.3 11.3 11.3
NaCl [%RH] 75.6 75.5 75.3 75.1 74.9
K2SO4 [%RH] 97.9 97.6 97.3 97.0 96.7
1. Do not use or store the LiCl solution in temperatures below +18 °C (64 °F) as its humidity equilibrium
may change permanently.
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