User`s guide

Chapter 4 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 107
5. When data messages appear in the terminal software, type open
and press ENTER.
6. Read the reference barometer reading.
7. Give the reference reading to TACMET MAWS. Type
PMT16CAL 1003.7 (where 1003.7 hPa is the reference
reading) and press ENTER.
8. Check the readings given by TACMET MAWS:
- Value = reference reading
- Measured value = measured by TACMET MAWS
- Offset = measured value - reference reading
9. Wait for a couple of minutes.
10. Check the pressure reading with the handheld terminal. It should
be the same as the reference reading.
11. Repeat the calibration, if necessary.
12. Type close and press ENTER to close the terminal connection.
13. Shut down the terminal software.
14. Restart MIDAS IV using TACMET Wizard.
Ceilometer CT25KAM
Periodic maintenance is normally limited to window cleaning. In
addition, alarms should be checked regularly with the handheld
terminal.
CAUTION
Ceilometer should never be opened by unauthorized personnel.
Opening it will void the warranty.
Window Cleaning
The ceilometer lens and window should always be free of any dirt or
particles during operation. Data messages include a warning if the
window is contaminated.
After the system has detected contamination, it starts the blower,
which removes contamination.