Optek TF16 - Page 27

Faults
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optek-Manual--1004-2006-02--TF16-US-2011-06-20
www.optek.com
Tab. 10 Possible faults and remedies
Possible fault Possible remarks Cause Remedy
Failure of
lamp module
• "Lamp failure" LED of conver-
ter flashes.
• Signal loss
Lamp cable between sensor
and converter defective
• Continuity test of lamp cable
• Exchange lamp cable for new
one.
Lamp module defective • Exchange lamp module.
Detector failure -
Detector cable between sen-
sor and converter defective
• Continuity test of detector
cable
• Exchange detector cable for
new one.
Detector defective • Exchange detector.
Condensate formation
Unrealistic, random measuring
results
Humidity gets into optical
housing and forms condensa-
tion deposits on windows.
• Use airpurge,
chapter 6.3.
O-Ring missing or defective
• Disassemble sensor assem-
blies and check O-Rings,
exchange if necessary.
Wrong results
• Results are fluctuating.
• Zero point is drifting.
• Sensor body windows are
dirty.
• Sensor body windows are
corroded.
• Lamp module near failure,
lamp module near the end of
its life.
• Clean sensor body window.
• Exchange sensor body win-
dow for sapphire window.
• Exchange lamp module.
Connection error
• No function
• No "Lamp failure" LED mes-
sage
Detector cable between sen-
sor and converter defective
• Continuity test of detector
cable
• Exchange detector cable for
new one.
Sensor cable incorrectly con-
nected to converter
• Check and revise connec-
tions.
Measuring range excee-
ded
↑ − ↑ − ↑
Converter indicates flashing
Process conditions
• Amplify measuring range.
• If the measuring range cannot
be amplified, apply absorption
measurement.
mA-signal (output)
mA-output delivers correct cur-
rent results if measuring results
are low
and too low current results if
measuring results are high.
Connected load > 600 ohms
• Check resistance of wiring.
• Use appropriate mA-input.
Small deviations given in %
Poor calibration of the receiving
mA-input
• Compensation by adjusting
calibration of the sending mA-
output.
mA-signal (input) Small deviations given in %
Poor calibration of the sending
mA-output
• Compensation by adjusting
calibration of the receiving
mA-input.
Defect of converter
None of the above mentioned
errors can be detected.
-
• Send system (converter and
sensor) to optek for checking
purposes. If necessary, the
sensor body can remain in
the pipeline so that only the
optical arms and the conver-
ter have to be sent.