Wika S-20 Bedienungsanleitung PDF herunterladen (Seite 5)

WIKA Safety manual pressure transmitter, model S-20

14082128.02 06/2014 GB/D/F/E

1.4 Abbreviations

Abbreviation Description

FMEA Failure Modes Eects and Diagnostic Analysis

MTTFd Expected value of the mean time to dangerous failure

PL Performance level: Discrete level which species the ability of safety-related parts of control systems to perform a

safety function under foreseeable conditions.

TM Service life

Settling time Time period between the step change in the pressure signal and the time at which the output signal deviates by no

more than 1 % tolerance from the value of the nal stable condition.

Switch-on time Time after power-on until the rst valid measured value (max. ±1% FSO error) is present at the signal output.

Table 1-2: Abbreviations (see also EN ISO 13849-1:2008 and EN ISO 13849-2:2012)

1. General information

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