Vaisala PWD22 - Heat; Wet

Chapter 5 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 77
The calibrator signal value is printed on the labels of the glass plates.
Typically the signal is close to 500 Hz. PWD22/52 calculates a new
scaling factor and stores it in the non-volatile memory (EEPROM).
If the PWC22
/52 board has been changed and the status message shows
the VISIBILITY NOT CALIBRATED error, use
FCAL instead of CAL
to make a factory
-like calibration.
CLEAN
Use the CLEAN command to set the clean references for contamination
control . Give this command during maintenance procedures after
cleaning the lenses or after replacing the transmitter or receiver
electronics. This command has no parameters.
Give the following command:
>CLEAN
The PWD22/52 output is the following:
CLEAN REFERENCES
TRANSMITTER 12.0
RECEIVER 1402
UPDATED
>
ZERO
Use the ZERO command when calibrating visibility to display the zero
signal status. This command has no parameters.
When the signal blocker of the PWA12 calibrator kit is installed to the
lens hood of the receiver (box), the PWD22/52 software checks for the
very low signal and low noise. If the signal or noise is out of the internal
check limits, an error message appears.
Give the following command:
>ZERO
The output is the following:
ZERO SIGNAL: OK
>
Or in the case of failure in the receiver (PWC22/52) one of the following: