EN
11583631.04 10/2017 EN/DE/FR/ES
WIKA safety manual temperature transmitter T32.xS
10
2.3 Restrictions to operating modes
WARNING!
Under the following operating conditions, the safety function of the instrument
is not guaranteed:
■
During configuration
■
When the write protection is deactivated
■
When the HART
®
multi-drop mode is activated
■
Measured value transmission via HART
®
protocol
■
During a simulation
■
During the proof test
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
■
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)
2. Safety