Maintenance
Troubleshooting Minor Problems
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13 Maintenance
Our sales representatives and customer service staff are always at your disposal for questions regarding
applications, 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.
13.1 Troubleshooting Minor Problems
Table 13-1: 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 emissivity or slope
Correct the setting
Temperature fluctuates
Wrong signal processing
Correct Peak/Valley Hold or Average settings
13.2 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.
Warning
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!
When an error or failure does occur, the temperature display indicates the possible failure area and the output
circuits automatically adjust to the lowest or highest preset level. The following table shows the corresponding
values and the error code transmitted over the digital interface.
