Wika T32.xS Manual do Utilizador descarregar pdf (Página 9)

WIKA safety manual temperature transmitter T32.xS

11583631.02 11/2010 GB/D/F/E

2.4 Error signaling

The model T32.xS temperature transmitter monitors the connected sensors and its

own hardware for errors. In the event of a known error condition the device generates

an error signalling current.

The response time from the sensor is a maximum of 90 seconds.

This implies the discovery of the following potential errors:

■

Sensor burnout

■

Sensor short circuit (only for resistance temperature sensors, not for thermocouples)

■

Inadmissably high lead resistance (not with duplex resistance temperature sensors)

The online diagnosis-test interval of the instrument should be a maximum of

35 minutes. This implies the discovery of the following potential device errors:

■

ROM error

■

EEPROM error

■

RAM error

■

Program-counter error

■

Stack-pointer error

Furthermore, the following monitoring functions are carried out continuously:

■

Logical program ow control

■

Internal communications error

■

Over sensor upper limit

■

Under sensor lower limit

■

Cold junction temperature outside permissible limits (only for thermocouples)

■

Duplex sensor drift monitoring (activated optionally)

■

Conguration error

■

Monitoring of the permissible device temperature (optional, activated by default for

SIL versions)

■

Monitoring of the output limits (optional, not activated by default for SIL versions

starting from 01.01.2011)

CAUTION!

The device's error signalling current (error current) is congured in

accordance with the following requirements:

■

Error current fail high (high alarm value):

settable in the range ≥ 21.0 mA to ≤ 23.0 mA (upscale)

■

Error current fail low (low alarm value) :

settable in the range ≥ 3.5 mA to ≤ 3.6 mA (downscale)

2. Safety

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