WIKA S-20 - Manual (Page 11)

11
GB
WIKA Safety manual pressure transmitter, model S-20
14082128.02 06/2014 GB/D/F/E
2.7 Information on the determination of safety-relevant parameters
The failure rates of the electronics were determined through an FMEA. The calculations have been based on component
failure rates per SN29500 and also component manufacturer specifications.
For this the following assumption applies:
The mean ambient temperature during the period of operation is 40°C.
In line with EN ISO 13849-1:2008, a maximum service life of 20 years in a safety application is assumed for the pressu-
re transmitter. The pressure transmitter must be removed from service at the end of this service life.
2.8 Limits of operation (including ambient conditions)
2.8.1 Requirements of the pressure medium
WARNING!
The pressure port should not become blocked by particles that are found in the pressure medium.
Further requirements in accordance with the model S-20 operating instructions
2.8.2 Permissible temperature ranges
Medium and ambient: -20 ... +80 °C
Outside of the permissible temperature range, the measuring accuracy of the pressure transmitter cannot be guaran-
teed, and thus the safety function can be impaired.
2. Safety