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7.2
Device-specific safety instructions
7.2.1
Safety function
Measuring temperature is the safety function with the temperature transmitters.
It is applicable for output currents from 4 to 20 mA and ensures an accuracy of ± 2% in the
maximum measurement range.
The output value will be updated at least every 620 ms (filter time constant of the electrical
damping = 0 s).
The partial system is of type B. The calculations are valid for the operating mode with low
demand rate in single-channel operation. The specific values are listed in the manufacturer
declaration for the product (Declaration of Conformity, Functional Safety according to IEC
61508 and IEC 61511): Certificates / EC declaration of conformity (Page 85) .
7.2.2
Requirements
The temperature transmitter meets the following requirements:
● Functional safety to SIL 2 under IEC 61508 or IEC 61511-1, from firmware version FW:
● Explosion protection for corresponding versions
● Electromagnetic compatibility in compliance with EN 61326
● EC Declaration of Conformity
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
as of 1/1/2004 (with order option C20 only)
Functional safety
7.2 Device-specific safety instructions
39
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