Restrictions To Operating Modes; Error Signaling - WIKA T32. S Serie Manual De Seguridad

2. Safety

2.3 Restrictions to operating modes

WARNING!
Under the following operating conditions, the safety function of the instrument
is not guaranteed:
EN
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■
■
■
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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 flow 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)
■
Configuration error
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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)
10
During configuration
When the write protection is deactivated
When the HART multi-drop mode is activated
®
Measured value transmission via HART
During a simulation
During the proof test
protocol
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WIKA safety manual temperature transmitter T32.xS