OPERATION OF IAQRAE
2-16
The ultraviolet light in PID sensors generates a very low level
of ozone. Stoppages of flow allow the ozone to build up in the
sensor housing. Since ozone is very reactive, it is quite efficient
in scrubbing contaminants out of the PID sensor when the
pump is off. This cleaning cycle does not reduce lamp life. It is
important to set the duty cycle as low as possible to allow for
some PID-cleaning, because the self-contained sensor cannot
be manually cleaned.
Unlike some other RAE products, the self-cleaning function is
not operative when the unit is turned off and plugged into the
charger. Self-cleaning is best performed by turning the unit on
in normal operating mode, setting it in a clean environment (<2
ppm VOC response) and setting the Duty Cycle to 50%.
Pump Stall
If liquid or other substance is sucked into the water filter
through the gas entry port and causes the pump to strain, the
monitor will immediately detect the obstruction and shut down
the pump. The alarm will activate, and user will see the flashing
“Pump” error message. After the filter is changed or obstacles
are removed, press [Y/+] to restart the pump. There are
different pump stall thresholds, which may be adjusted. (See
Section 7.1 Diagnostic Mode)
