Maintenance
9.2 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.
Error Codes for the Outputs
Symptom | mV | 0 to 20 mA | 4 to 20 mA |
|
|
|
Temperature over | 5 V | 21 mA | 21 mA |
| - | - |
range |
|
|
|
|
|
|
Temperature under | 0 V | 0 mA | 2.5 mA |
| - | - |
range |
|
|
|
|
|
|
Defect of the internal | 5 V | 21 mA | 21 mA |
| > 1200°C | > 1200°C |
head ambient |
|
|
|
| (2192 °F) | (2192 °F) |
temperature probe |
|
|
|
|
|
|
| Table 7: Error Codes (Outputs) |
|
| |||
MI | 61 |