Vaisala WMS302 User's Guide Page 177

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Chapter 6 ______________________________________________________________ Maintenance
VAISALA______________________________________________________________________ 175
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)
5. Check the readings given by MAWS.
Value = reference reading
Measured value = measured by MAWS
Offset = measured value - reference reading
6. Repeat the calibration if necessary.
7. Close the terminal connection by giving the close command.
Rain Gauges
Periodic Maintenance of QMR101
To ensure reliable and accurate measurements, we recommend that the
following checks be carried out at each visit to the rain gauge.
1. Inspect the funnel for any damage or blockage. At certain times of
year, leaves may have accumulated into the funnel. Dirt and dust
can also block the grille preventing or reducing the flow rate to a
slow drip to the buckets beneath. Remove all obstacles from the
funnel.
NOTE
Make sure that the wind does not interfere with the reading of the
reference barometer.
NOTE
If the gauge is still connected to the data logger and logger is operating,
care must be taken to avoid tipping the spoon/bucket when carrying
out the following operations.
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