TROUBLESHOOTING
8-4
Below is a brief description of the diagnostic displays
:
1) Raw Sensor Readings
The raw sensor readings provide a quick diagnosis on the
response and the sensitivity of the sensor. When zero gas
(fresh clean air) is applied to the monitor, the raw sensor
readings typically should be between 100 and 400 for 1A
and 10A, 64 and 840 for 100A. If the raw reading is
outside this range when zero gas is applied, the sensor or
the lamp housing may be dirty or the electronics may be
defective. Channel A is the PID sensor. Channel B is an
auxiliary channel that is currently not used.
When a test gas is applied to the monitor, the raw readings
should increase. If the reading does not change when the
gas is applied, then the sensor or lamp may be defective.
2) Adjust Lamp Failure Threshold
This display can be used to calibrate the PID lamp failure
threshold. If the lamp appears to be good but in normal
operation a lamp failure message (i.e. “Lamp”) is
displayed, the lamp failure level may be set too high. This
level can be adjusted by using the following steps:
1.
Turn the monitor off. Remove the UV lamp from the
PID sensor (see Section 7.2).
2.
Turn the monitor on in the special diagnostic mode
(
[Y/+]
&
[MODE]
).
3.
Press the
[MODE]
key until “Lamp xxx” is displayed,
write down this number. The reading “xxx” is the lamp
current reading.
4.
Press the
[MODE]
key one more time, “Fail yyy” is
now displayed. The value “yyy” is the threshold level
