Optek C4101 - Page 199

Faults
- 189 -
optek-converter C4101 Version 07.2009_1.2US, 23.07.2009
www.optek.com
Tab. 28 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 air purge.
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.