4-/5-Gas Measuring Instruments Unit AVL 4000
5-18 Service Manual
Primary error symptom Primary cause
(of error)
Secondary cause of
error
Possible tests/
establishing cause
Remedy
Warm-up error FE, SE, SZ stable at
128 ± 10?
ES=000000 ?
Wait until instrument
has warmed up (SS
must be 00)
Replace measuring
instruments unit
Detector preamplifier faulty or feedback
control inaccurate
FE, SE, SZ stable at
128 ± 10?
ES=000000?
Reset, or measuring
instruments unit
faulty
Replace detector
Replace measuring
instruments unit
Hoses inside are disconnected or faulty Test flow rates Replace hoses
Measurement values
fluctuating
significantly after
zeroing or calibration
Exhaust gas, petrol or other gases in the
air
Can you smell
anything?
Air the room or
connect hose on
carbon filter to fresh
air supply
Substantial
fluctuations in
measurement
values
See “Measurement
values fluctuating
significantly”
Ambient air heavily polluted by petrol,
exhaust gas…
Can you small
anything?
Negative
measurement
values?
Air the room or
connect hose on
carbon filter to fresh
air supply
ZEROING/ZERO not
possible
EMC interference
during zeroing
Check error status Switch instrument
OFF/ON
Carry out power
reset; then
CALIBRATION
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