AVL DiCom 4000 - Page 117

4000 4-/5-Gas Measuring Instruments Unit
Service Manual 5-21
Primary error symptom Primary cause
(of error)
Secondary cause of
error
Possible tests/
establishing cause
Remedy
Filter soiled Pre- and paper filter
not changed
Metal mesh filter not
cleaned (465)
Any soiling visible,
flow rate setpoint:
2
min
l
at each outlet
Clean, replace
especially after tests
on 2-stroke engines
Filter and pump
iced up
Stored at below
0° Celsius? With
condensate?
Pump faulty or
leaking
Allow instrument to
thaw before
switching it on or
replace pump
Probe (hose)
pinched or blocked
Ice, blockage (probe
connection fitting)
Any soiling visible?
Stored at below
0° Celsius?
Hose kinked?
Clean or lay hose so
that it is not kinked
Solenoid valve
faulty
Soiling or defective Test: valve and flow
rate in service
mode, flow rate set
point: greater than
2
min
l
at each outlet
Replace solenoid
valve
Hose leaking or disconnected
Hose kinked inside
Check hoses
Carry out leak test
Check flow rate
Replace or connect
hose
No/low gas flow
Pump faulty or
leaking
Pump connection
fitting broken off
Check flow rate,
carry out leak test
Replace or clean
pump or pump head
Measurement
distorted
EMC interference Service mode:
measurement cell
temperature less
than 65° C?
Carry out reset
(OFF/ON) if less
than 65° C
Ambient
temperature too
high
Ambient tempera-
ture higher than
40° C
Instrument placed in
direct sunshine or
close to a radiator
Service mode:
measurement cell
temperature higher
than 65° C?
Ambient tempera-
ture higher than
40° C?
Place instrument in
shade or somewhere
else and let it cool
down.
Measurement cell
temperature too high
Temperature
sensor faulty
Display error status
and check raw data
value for T
Replace sensor