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8. TROUBLESHOOTING
8.1 Error message
If errors occur, the following contents are displayed.
Error display
Error contents
Error No. 1
Sector motor rotation detector signal is faulty.
Error No. 3
A/D conversion signal is faulty.
Error No. 4
Zero calibration is not within the allowable
range.
Error No. 5
A amount of zero calibration (indication value) is
over 50% of full scale.
Error No. 6
Span calibration is not within the allowable
range.
Error No. 7
A amount of span calibration (difference
between indication value and calibrated
concentration value) is over 50% of full scale.
Error No. 8
Measured values fluctuate to much during zero
and span calibration.
Error No. 9
Calibration is abnormal during auto calibration.
Error No. 10
Output cable connection is improper.
Note:
When errors No. 1, No. 3 and No. 10 occur, instrument error output contacts are conductive.
When errors No. 4 to No. 9 occur, calibration error output contacts are conductive.
Screen display and operation at the occurrence of error.
In case of Error No. 1 to No. 4, No. 6, No. 8 to No. 10
Teledyne Analytical Instruments
Probable causes
• Infrared ray light source is faulty.
• Sector motor rotation is faulty or stopped.
• Motor rotation detector circuit is faulty.
• Amplifier circuit is faulty.
• Circuit is faulty.
• Zero gas is not supplied.
• Zero point is deflected much due to a dirty cell.
• Detector is faulty.
• Span gas is not supplied.
• Calibrated concentration setting does not
match cylinder concentration.
• Zero calibration is not performed properly.
• Span is deflected much due to dirty cell.
• Detector sensitivity is deteriorated.
• Calibration gas is not supplied.
• Time for supplying calibration gas is not short.
• Error corresponding to No. 4 to No. 8 occurred
during auto calibration.
• Wiring is detached between analyzer and
interface module.
• Wiring is disconnected between analyzer and
interface module.
68
Model 7500 Instruction Manual
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