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Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 269
Table 13-1: Warning Messages - Indicated Failures
WARNING
MESSAGE
FAULT CONDITION POSSIBLE CAUSES
BENCH TEMP
WARNING
The optical bench temp is
controlled at 48 2
°
C.
Bad bench heater
Bad bench temperature sensor
Bad relay controlling the bench heater
Entire relay board is malfunctioning
I
2
C bus malfunction
BOX TEMP
WARNING
Box Temp is
< 5
°
C or > 48
°
C.
NOTE: Box temperature typically runs ~7
o
C warmer than ambient
temperature.
Poor/blocked ventilation to the analyzer.
Stopped exhaust-fan
Ambient temperature outside of specified range
CANNOT DYN
SPAN
Dynamic Span operation failed
Measured concentration value is too high or low.
Concentration slope value to high or too low
CANNOT DYN
ZERO
Dynamic Zero operation failed
Measured concentration value is too high.
Concentration offset value to high.
CONFIG
INITIALIZED
Configuration and Calibration data
reset to original Factory state.
Failed disk on chip
User erased data
DATA INITIALIZED
Data Storage in iDAS was erased
Failed disk on chip
User cleared data
FRONT PANEL
WARN
The CPU is unable to Communicate
with the Front Panel Display
/Keyboard
Warning only appears on serial I/O com port(s)
Front panel display will be frozen, blank or will not respond.
Failed keyboard
I
2
C bus failure
Loose connector/wiring
PHOTO TEMP
WARNING
PHT DRIVE is
>4800 mVDC
Failed IR photo-detector
Failed sync/demod board
IR photo-detector improperly attached to the sample chamber
Bench temp too high.
REAR BOARD NOT
DET
Motherboard not detected on power
up.
Warning only appears on serial I/O com port(s)
Front panel display will be frozen, blank or will not respond.
Massive failure of motherboard
RELAY BOARD
WARN
The CPU cannot communicate with
the Relay Board.
I
2
C bus failure
Failed relay board
Loose connectors/wiring
SAMPLE FLOW
WARN
Sample flow rate is < 500 cm
3
/min
or > 1000 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:
Blocked particulate filter
Blocked sample inlet/gas line
Failed pressure sensor/circuitry
If sample pressure is > 35 in-hg:
Pressurized sample gas. Install vent
Blocked vent line on pressurized sample/zero/span gas supply
Bad pressure sensor/circuitry