Optek AF45 - Page 29

Faults
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optek-Manual--1004-2003-02--AF45-US-2011-01-04
www.optek.com
Tab. 12 Possible faults and remedies
Possible fault Possible remarks Cause Remedy
Failure of lamp module
• "Lamp failure" LED of
converter 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 sensor
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
condensation deposits on
windows.
• Use airpurge
chapter 6.3, page 19.
O-Ring missing or defective
• Disassemble sensor
assemblies 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
window for sapphire window.
• Exchange lamp module.
Connection error
• No function
• No "Lamp failure" LED
message
Detector cable between sensor
and converter defective
• Continuity test of detector
cable
• Exchange detector cable for
new one.
Sensor cable incorrectly
connected to converter
• Check and revise
connections.
Measuring range
exceeded
↑ − ↑ − ↑
Converter indicates flashing
Process conditions
• Amplify measuring range.
• If the measuring range cannot
be amplified, reduce optical
path length.
Wavelength-dependent
detector module reduces the
dynamic measuring range,
optical filters reduce wanted
signal.
• Reduce optical path length
and / or change measuring
wavelength.
• Exchange lamp module.
mA-signal (output)
mA-output delivers correct
current 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.
Converter defective
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
converter have to be sent.