RayTek MI Miniature Infrared Sensor - Fail -Safe Operation

Maintenance
MI 61
9.2Fail‐SafeOperation
TheFail‐Safesys tem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 TC-K TC-J
Temperature over
range
5 V 21 mA 21 mA - -
Temperature under
range
0 V 0 mA 2.5 mA - -
Defect of the internal
head ambient
temperature probe
5 V 21 mA 21 mA > 1200°C
(2192 °F)
> 1200°C
(2192 °F)
Table7:ErrorCodes(Outputs)