AVL AVL DiCom 4000, Service Manual

Page: 121 / 182

4000 4-/5-Gas Measuring Instruments Unit
Service Manual 5-25
Primary error symptom Primary cause
(of error)
Secondary cause of
error Possible tests/
establishing cause Remedy
Pressure sensor
measuring
instruments unit
(465) faulty All hoses and flow
rates OK but
measurement value
0 or 255 (raw data) (465)
Replace sensor
Replace Andros main
board
Replace measuring
instruments unit
Hose disconnected
inside Is there a leak error? Hold the hose
closed after the O
2
sensor: the pressure
must increase to
855 mbar (registered
at the measuring
instruments unit)
Connect hose
Hose pinched
inside or outside
(after measuring
instruments unit) Pressure
measurement value
255 (raw value
measuring
instruments unit) Check flow rates Replace hose
AVL 4000 pneumatics pressure sensor
faulty Setpoint: 118…138
with pump
switched off Replace sensor
Replace board
Pressure reducer throttle in AVL 4000
pneumatics system faulty Setpoint must
increase (128 ± 10 )
when pump
switched on and
inlet is closed off Replace pressure
reducer throttle in
silicon hose
Pressure measurement
value incorrect
Pressure reducer throttle in the Andros
measuring instruments unit (blue
connector) faulty Pressure
measurement value
OK, no leaks,. but
no response when
hose held closed
after O
2
sensor
Replace pressure
reducer or drill
0.1 mm hole
Measuring instruments unit has been
replaced but value not entered Compare PEF on
instrument and PEF
in service mode,
value must be
between 490 and
540 Enter PEF correctly
on sticker
Detector replaced
and value not
entered Serial number may
be different or
000000 As above Correct PEF
PEF factor incorrect
Stored value
incorrect Replace measuring
instruments unit