RayTek 54301 9.2FailSafeOperation, MID61

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 TC-K TC-J
Temperature over
range
5 V 21 mA 21 mA - -
Temperature under
range
0 V 2.5 mA 0 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)
MID61