TROUBLESHOOTING
8-2
Troubleshooting Continued
“Lamp” message
during operation
Wrong threshold
Dirty PID sensor
Weak or defective PID
lamp
Adjust lamp
threshold
Clean PID sensor
Replace PID lamp
Reading
abnormally low
Incorrect calibration
Low sensitivity to the
specific gas
Wrong correction factor
Calibrate monitor
Replace sensor
Check correction
factor
Read a small
background
value when there
is no detectable
gas
Sensor zero drifts
The unit is out of battery
power or disconnected,
or the sensor was just
plugged in
Do fresh air
calibration (see
section 4.4.1)
Wait for the reading
to stabilize
Reading jumps
around randomly
Incorrect gas calibration
Low sensitivity to
calibration gas
Calibrate the
sensor
Clean PID
Check Sensor
Cannot turn
monitor off
Corrupted
characters on
LCD
Microprocessor hang-up
Disconnect and
reconnect battery
to reset computer
Call authorized
service center
Calibration error
message
No standard gas input
Make sure
standard gas flows
into monitor
“Bat” message in
operation
Uncharged battery
Recharge battery
Full-scale
measurement in
humid
environment
Dirty or wet sensor
Clean and dry
sensor
Replace External
Filter
VOC
measurement
maxes out at
certain level
Dirty PID sensor
module
Weak PID lamp
Clean lamp/sensor
module
Release with a new
lamp
Replace filter
(Continued)