Teledyne GFC 7001EM operation manual Fault Diagnosis with Test Functions, Sample Temp

Troubleshooting & Repair		Model GFC7001E Carbon Dioxide Analyzer
	Table 13-1: Warning Messages – Indicated Failures (cont.)
WARNING	FAULT CONDITION	POSSIBLE CAUSES
MESSAGE
		Ambient temperature outside of specified range
SAMPLE TEMP	Sample temperature is < 10oC or >	Failed bench heater
		Failed bench temperature sensor
WARN	100oC.	Relay controlling the bench heater
		Failed relay board
		I2C bus
		GFC Wheel stopped
	Occurs when CO Ref is <1250	Failed sync/demod board
	mVDC or >4950 mVDC.	If status LED’s on the sync/demod board ARE flashing the cause is
SOURCE WARNING		most likely a failed:
		IR source
	Either of these conditions will result
		Relay board
	in an invalid M/R ratio.	I2C bus
		IR photo-detector
		This message occurs at power on. If you have not cycled the power
SYSTEM RESET	The computer has rebooted.	on your instrument:
		Failed +5 VDC power,
		Fatal error caused software to restart
		Loose connector/wiring
		Blocked cooling vents below GFC Assembly. Make sure that
		adequate clear space beneath the analyzer.
WHEEL TEMP	The filter wheel temperature is	Analyzer’s top cover removed
		Wheel heater
WARNING	controlled at 68  2 °C	Wheel temperature sensor
		Relay controlling the wheel heater
		Entire relay board
		I2C bus

13.1.2.FAULT DIAGNOSIS WITH TEST FUNCTIONS

Besides being useful as predictive diagnostic tools, the test functions viewable from the front panel can be used to isolate and identify many operational problems when combined with a thorough understanding of the analyzer’s Theory of Operation (see Section Error! Reference source not found.).

The acceptable ranges for these test functions are listed in the “Nominal Range” column of the analyzer Final Test and Validation Data Sheet (GFC 7001E, P/N 04307 and GFC 7001EM, P/N 04311) shipped with the instrument. Values outside these acceptable ranges indicate a failure of one or more of the analyzer’s subsystems. Functions whose values are still within the acceptable range but have significantly changed from the measurement recorded on the factory data sheet may also indicate a failure.

NOTE:

A worksheet has been provided in Appendix C to assist in recording the value of these test functions.

This worksheet also includes expected values for the various test functions.

Teledyne Analytical Instruments 270