Maintenance
74
MI3
11
Maintenance
Our sales representatives 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 call our Service Department for authorization
prior to return. Phone numbers are listed at the beginning of this document.
11.1
Troubleshooting Minor Problems
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
Correct the setting
Temperature fluctuates
Wrong signal processing
Correct Peak/Valley Hold or Average settings
Temperature fluctuates
No ground for the head
Check wiring / grounding
Table 7: Troubleshooting
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. The sensor is designed to shutdown 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 processes.
Other safety devices should also be used to supplement this function!
When an error or failure does occur, the display indicates the possible failure area, and the output
circuits automatically adjust to their preset levels. See the following tables:
Symptom
0 to 5 V 0 to 10 V
0 to 20 mA
4 to 20 mA
Temperature over range*
5 V
10 V
21 to 24 mA
21 to 24 mA
Temperature under range*
0 V
0 V
0 mA
2 to 3 mA
Head ambient temperature out of range
5 V
10 V
21 to 24 mA
21 to 24 mA
Communication error between head and box
5 V
10 V
21 to 24 mA
21 to 24 mA
* related to zoomed temperature range
Table 8: Error Codes for Analog Output
1.800.868.7495
