AVL DiGas 4000 - Page 118

4-/5-Gas Measuring Instruments Unit AVL 4000
5-22 Service Manual
Primary error symptom Primary cause
(of error)
Secondary cause of
error
Possible tests/
establishing cause
Remedy
Calibration timer
has expired
Timer set to 0 days
in calibration mode
Calibrate the
instrument
No AU (Official
Measurement) possible
Important
measurement
channel, e.g. O
2
, is
faulty
Check for faults Repair
Fault in measuring
instruments unit
Check error status
ES
If error found: try
zeroing, reset or
power reset
Otherwise replace
measuring
instruments unit
Capacitor faulty Power supply unit
faulty
Replace capacitor
(Andros part)
Check error status
ES and CO2CS,
COCS, HCCS and
FE, SE, SZ
Check power supply
unit and if necessary,
replace measuring
instruments unit
Measuring
instruments unit
faulty
Raw data in one
channel = 262143
and constant
Replace measuring
instruments unit
All or some incorrect
measurement values
for CO
2
, CO, HC
Exhaust gas, petrol
or other gas in the
air
Negative
measurement values
(HC)
Can you smell
anything?
Air the room or
connect hose from
the carbon filter to
the fresh air supply
Carbon filter faulty,
soiled (HC)
Hydrocarbon
content (i.e. petrol)
in the air too high
Service mode:
zeroing. If HC < 0 is
then displayed,
carbon filter faulty
Replace carbon filter
Connect hose from
carbon filter to fresh
air supply
Measurement cell
contaminated with
particulate (HC)
Check raw data
values
Clean or replace
measurement cell
Replace measuring
instruments unit
Pump flow rate
poor
Check pump
(underpressure or
flow rate)
Repair, clean or
replace pump
Hose soiled or
instrument
contaminated with
oil
Filter not changed
often enough or not
changed at all
Replace all filters
Check raw data
Clean external hoses
If necessary, give
instrument a service,
replace all hoses and
clean measurement
cell
Negative measurement
values for some or all
of CO
2
, CO, HC,
especially HC
Exhaust gas, petrol
or other gas in the
air
Incorrect
measurement values
Can you smell
anything?
Air the room or
connect hose from
carbon filter to fresh
air supply