Wika T32.xS Bedienungsanleitung PDF herunterladen (Seite 10)

11583631.03 08/2014 GB/D/F/E

WIKA safety manual temperature transmitter T32.xS

2.4 Error signaling

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

hardware for errors. In the event of a known error condition the instrument generates an

error signalling current.

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

This implies the discovery of the following potential errors:

■

Sensor break

■

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

■

Inadmissibly high lead resistance (not with resistance temperature sensors with

2-wire connection)

The online diagnosis test interval of the instrument should be a maximum of 35 minutes.

This implies the discovery of the following potential instrument 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 communication errors

■

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 instrument temperature (optional, activated by default

for SIL versions)

■

Monitoring of the output limits (optional, with SIL versions from 01 January 2011 not

activated as default)

CAUTION!

The instrument'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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