TROUBLESHOOTING
8-12
Problem Possible Reasons & Solutions
Read a small
background
value
Reasons: There is actually a small
background gas level.
Sensor zero drift.
Solutions: Do fresh air calibration (see
Section 4.4.1).
Reading jumping
around randomly
Reasons: Incorrect calibration gas value.
Low sensitivity to cal gas.
Weak or dirty lamp.
Air leakage.
Solutions: Calibrate the sensor.
Use different cal gas.
Clean or replace lamp.
Check air leakage.
Cannot turn off
monitor or
corrupted
characters in
LCD display
Reasons: Microprocessor hang-up
Solutions: Disconnect and re-connect
battery to reset computer.
Call authorized service center.
“Bat” message in
operation
Reasons: Discharged battery.
Solutions: Recharge battery.
Excessive pump
noise or no inlet
air suction
Reasons: Blocked inlet path.
Defective pump.
Solutions: Check inlet connection.
Check pump.
Calibration error
message
Reasons: No standard gas input.
Weak PID lamp.
Unit zeroed with gas present.
Solutions: Make sure standard gas flows
into monitor.
Zero sensor & recalibrate.
Replace lamp.
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