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TROUBLESHOOTING & REPAIR PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
198
P/N 04288 Rev: A
Signal I/O Parameter
LED Function
Activated By
View Result
Diagnostic Technique
D2
Yellow
Wheel
Heater
WHEEL_HEATER WHEEL_TEMP
Voltage displayed should change.
If not:
§
Failed Heater
§
Faulty Temperature
Sensor
§
Failed AC Relay
§
Faulty Connectors/Wiring
D3
Yellow
Bench
Heater
BENCH_HEATER BENCH_TEMP
Voltage displayed should change.
If not:
§
Failed Heater
§
Faulty Temperature
Sensor
§
Failed AC Relay
§
Faulty Connectors/Wiring
D4
Yellow
Spare N/A
N/A
N/A
D5
Green
Sample/Cal
Gas Valve
Option
CAL_VALVE
N/A
Sample/Cal Valve should audibly
change states. If not:
§
Failed Valve
§
Failed Relay Drive IC on
Relay Board
§
Failed Relay Board
§
12 VDC Supply
(PS2)
§
Faulty Connectors/Wiring
D6
Green
Zero/Span
Gas Valve
Option
SPAN_VALVE
N/A
Zero/Span Valve should audibly
change states. If not:
§
Failed Valve
§
Failed Relay Drive IC on
Relay Board
§
Failed Relay Board
§
12 VDC Supply
(PS2)
§
Faulty Connectors/Wiring
D7
Green
Shutoff
Valve Option
SHUTOFF_VALVE
N/A
Shutoff Valve should audibly
change states. If not:
§
Failed Valve
§
Failed Relay Drive IC on
Relay Board
§
Failed Relay Board
§
12 VDC Supply
(PS2)
§
Faulty Connectors/Wiring
D8
Green
IR SOURCE
IR_SOURCE CO_MEASURE
Voltage displayed should change.
If not:
§
Failed IR Source
§
12 VDC Supply
(PS2)
§
Failed Relay Board
§
Failed IR Photo-Detector