TROUBLESHOOTING
7-8
Reading abnormally
low
Incorrect calibration
Low sensitivity to
the specific gas
Low gas flow to
sensor(s)
Calibrate monitor
Replace sensor
Check sensor raw
response in
diagnostic mode
Check gas flow path
for leaks; replace
pump or pump
diaphragm
Read a small
background value
when there is no
detectable gas
Sensor zero drifted
The unit was out of
battery power
connection
The sensor had just
been plugged in
Do fresh air
calibration
Wait for reading to
be stabilized
Reading jumps
around randomly
Incorrect gas
calibration
Low sensitivity to
calibration gas
Calibrate the sensor
Reduce duty cycle
to clean PID
Check sensor raw
response in
diagnostic mode
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
Low standard gas
input
Defective sensor
Check cylinder
expiration date
Check cylinder
pressure
Check gas flow path
for leaks
Check pump flow
User higher gas
concentration
Replace sensor
(Continued)
