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Innovative High Temperature Fiber Optic Infrared Pyrometers
Maintenance
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11. Maintenance
Our sales representatives and customer service are always at your disposal for questions
regarding application assistance, calibration, repair, and solutions to specific problems. Please
contact your local sales representative if you need assistance. In many cases, problems can
be solved over the telephone. If you need to return equipment for servicing, calibration, or
repair, please contact our Service Department before shipping. Phone numbers are listed at
the beginning of this document.
11.1. Troubleshooting Minor Problems
Table 9: Troubleshooting
Symptom Probable Cause Solution
No output No power to instrument Check the power supply
Erroneous temperature Faulty sensor cable Verify cable continuity
Erroneous temperature Field of view obstruction Remove the obstruction
Erroneous temperature Window lens Clean the lens
Erroneous temperature Wrong slope or emissivity Correct the setting
Temperature fluctuates Wrong signal processing Correct Peak Hold or Average settings
11.2. Fail-Safe Operation
The Fail-Safe system is designed to alert the operator and provide a safe output in case of any
system failure. Basically, it is designed to shut down the process in the event of a set-up error,
system error, or a failure in the sensor electronics.
The Fail-Safe circuit should never be relied on exclusively to protect critical
heating processes. Other safety devices should also be used to supplement
this function!
11.2.1. Fail-Safe Error Codes (displayed or transmitted via electrical interfaces)
When an error or failure does occur, the temperature display indicates the possible failure area,
and the output circuits automatically adjust to their lowest or highest preset level. The following
table shows the values displayed on the 7-segment temperature display and transmitted over
the RS485 or LAN / Ethernet interface.
Table 10: Error Codes in 1-Color Mode
Symptom Error Code Priority
Heater control temperature over range ECHH 1 (high)
Heater control temperature under range ECUU 2
Internal temperature over range EIHH 3
Internal temperature under range EIUU 4
Temperature under range EUUU 5
Temperature over range EHHH 6 (low)