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Maintenance
Symptom
Symptom Number Four
Erratic temperature display and outputs.
• Target and measurement conditions
unknown. Actual temperature variations
may sensed.
Possible Cause / Corrective Action
1. Check for recurrent interruptions in sight path e.g. bursts of smoke
or steam, moving equipment.
2. Use air purge to clear some obstructions, If using air purge check
air flow and operation
3. Vary the Response Time to see if the symptom changes.
4. Use Peak Picker signal conditioning with suitable decay rate.
5. Use Track and Hold signal conditioning.
Symptom Number Five
Erratic display and outputs.
• Target temperature and measurement
conditions known to be stable
1. Check Sensor cable connections. Also, check the signal cable
shield connection at the Grounded Strain Relief Fitting.
2. Check for proper grounding of all system components.
3. Check cable routing. Signal cables must not run in the
same conduit as noisy power lines or power lines with transients.
4. Check ambient temperature of Sensor Add water cooling
and/or heat shielding to Sensor, if necessary.
No Invalid Measurement Condition Alarm
1. Check iALM function under Engineering Menu.
Cannot adjust or select functions at the
Sensor rear panel.
1. Check Panel Lock function in Engineering Menu.
RS-485 Communications problems
1. Check Communications Lock setting in COMMS Menu. Selections
are Read Only and Read / Write.
2. Check Baud Rate setting in COMMS Menu.
3. Check Address setting in COMMS Menu.
Laser will not energize
1. Laser will not energize when CAL function is operating or initiated
Peak Picker signal conditioning not
functioning
1. Check if the Auto Peak Picker Reset is On. If ON, evaluate the
Reset Below Temperature settings. Peak Picker may be Auto
reset with Reset Below temperature too low
Peak Picker Delay not operating
1. Peak Picker Delay only operates after a Peak Picker Reset or after
the first temperature indication displayed after an Invalid (INV)
condition or below Sensor temperature range (LOW) condition.
2. Delay timing starts immediately after the reset or the Invalid or
LOW condition.
Can not adjust AOUT ZERO or FULL Scale
136
1. Check both ZERO and FULL settings. Minimum 10°F span is
required (or equivalent °C span values)
Rev. L4 12/2012
Modline 5