Wika T32.xS Manual do Utilizador descarregar pdf (Página 6)

11583631.02 11/2010 GB/D/F/E

WIKA safety manual temperature transmitter T32.xS

2. Safety

2.1 Intended use in safety applications

All safety functions relate exclusively to the analogue output signal (4 … 20 mA). The

device is certied to SIL2 (IEC 61508) . The device software fullls 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 %,

sucient 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 eective range of the output

signal limited to a minimum of 3.8 mA and a maximum of 20.5 mA (factory setting in

basic conguration).

WARNING!

Do not exceed the specications 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 Terminal voltage limits

T32.1S.000-S

T32.3S.000-S

DC 10,5 ... 42 V

T32.1S.0IS-S

T32.3S.0IS-S

DC 10,5 ... 30 V

2. Safety

1 2 3 4 5 6 7 8 9 10 11 ... 59 60

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