Safety function Temperature transmitter iTEMP TMT82
12 Endress+Hauser
λ
DD
(Dangerous detected)
• Dangerous failure which can be detected
• Impact on the safety-related output signal: results in a failure mode at the output signal
• Impact on the measurement uncertainty:
3 – Has no effect
λ
DU
(Dangerous undetected)
• Dangerous failure which cannot be detected
• Implications for the safety-related output signal: can be outside the defined error range
• Impact on the measurement uncertainty:
4 – May be outside the specified error range
4.3 Dangerous undetected failures in this scenario
An incorrect output signal that deviates from the value specified in this manual but is still
in the range of 4 to 20 mA, is considered a "dangerous, undetected failure". → 10
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