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M300EU TROUBLESHOOTING & REPAIR
(Addendum to M300EU Manual - P/N 04145)
Table 11-1: Warning Messages – Indicated Failures (cont.)
WARNING
MESSAGE
FAULT CONDITION POSSIBLE CAUSES
SAMPLE FLOW
WARN
Sample flow rate is
<1400 cm
3
/min
or
> 2200 cm
3
/min.
Failed sample pump
Blocked sample inlet/gas line
Dirty particulate filter
Leak downstream of critical flow orifice
Failed flow sensor/circuitry
SAMPLE PRES
WARN
Sample Pressure is
<10 in-Hg or > 35 in-Hg
Normally 29.92 in-Hg at sea level
decreasing at 1 in-Hg per 1000 ft of
altitude (with no flow – pump
disconnected).
If sample pressure is < 10 in-hg:
o Blocked particulate filter
o Blocked sample inlet/gas line
o Failed pressure sensor/circuitry
If sample pressure is > 35 in-hg:
o Pressurized sample gas. Install vent
o Blocked vent line on pressurized sample/zero/span gas
supply
o Bad pressure sensor/circuitry
SAMPLE TEMP
WARN
Sample temperature is < 10
o
C or >
100
o
C.
Ambient temperature outside of specified range
Failed bench heater
Failed bench temperature sensor
Relay controlling the bench heater
Failed relay board
I
2
C buss
SOURCE
WARNING
Occurs when CO Ref is <1250
mVDC or >4950 mVDC.
Either of these conditions will result
in an invalid M/R ratio.
GFC wheel stopped
Failed sync/demod board
If status LED’s on the sync/demod board
ARE flashing the
cause is most likely a failed:
IR source
Relay board
I
2
C buss
IR photo-detector
SYSTEM RESET
The computer has rebooted.
This message occurs at power on. If you have not cycled the
power on your instrument:
o Failed +5 VDC power,
o Fatal error caused software to restart
o Loose connector/wiring
WHEEL TEMP
WARNING
The filter wheel temperature is
controlled at 68 ± 2
°
C
Blocked cooling vents below GFC Assembly. Make sure that
adequate clear space beneath the analyzer.
Analyzer’s top cover removed
Wheel heater
Wheel temperature sensor
Relay controlling the wheel heater
Entire relay board
I
2
C buss
05514 Rev A1 61