Safety; Intended Use In Safety Applications - WIKA T32. S Serie Manual De Seguridad

2. Safety

2. Safety

2.1 Intended use in safety applications

All safety functions relate exclusively to the analogue output signal (4 ... 20 mA). The
GB
device is certified to SIL2 (IEC 61508) . The device software fulfills the criteria for SIL3
(IEC 61508). The use of the device in homogeneous reduntant systems is therefore
possible.
The following sensor connections achieve an SFF (Safe Failure Fraction) of >90 %,
sufficient for SIL2:
Thermocouple (internal cold junction, Pt100)
■
Thermocouple (external cold junction, Pt100)
■
Resistance thermometer with 4-wire connection
■
Resistance thermometer with 3-wire connection
■
WIKA sensors Model TRxx (see WIKA manufacturer's declaration
Document No. 3011701)
Duplex thermocouple and/or duplex resistance thermometer (only in "redundant"
■
operating mode and when both sensors are used for monitoring the same
measurement point (2 channel)).
The following sensor connections achieve an SFF (Safe Failure Fraction) of >60 % for
SIL1:
Resistance thermometers with 3-wire connection
■
- universal sensors -
Resistance thermometers with 2-wire connection
■
The device generates a current signal in the approved measuring mode of a nominal
4 ... 20 mA, that is dependent upon the sensor signal. The effective range of the output
signal limited to a minimum of 3.8 mA and a maximum of 20.5 mA (factory setting in
basic configuration).
WARNING!
Do not exceed the specifications for the model T32.xS given in the data
sheets and operating instructions. In order to ensure a safe functionality
of the current output, the correct terminal voltage must be present in the
device.
The following terminal voltage limits apply:
Instrument model
T32.1S.000-S
T32.3S.000-S
T32.1S.0IS-S
T32.3S.0IS-S
6
Terminal voltage limits
DC 10,5 ... 42 V
DC 10,5 ... 30 V
WIKA safety manual temperature transmitter T32.xS