Siemens SITRANS SL - Safety Characteristics

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Device-specific Safety Instructions

Safety Manual

20 Operating Instructions, 06/2012, A5E03433511-05

3.7 Safety characteristics

The safety characteristics necessary for use of the system are listed in the SIL declaration of

conformity. These values apply under the following conditions:

● The SITRANS SL is only used in safety-related systems with a low demand mode for the

safety function

● When external sensors for process temperature and process pressure are used they

have to be considered as part of the Safety related system.

● Purging of sensors must be considered as part of the Safety related system.

● The safety-related parameters/settings (see chapter Settings (Page 16)) have been

entered

by local operation and checked before starting safety-instrumented operation.

● The SITRANS SL is blocked against unintentional and unauthorized changes/operation.

● All used materials are compatible with process conditions.

● The MTTR after a device fault is 72 hours.

● The logic solver (PLC) has to be configured to detect low range (<3.6 mA) failure of the

SITRANS SL (fail low) and will recognize these as internal failure of the devices and not

cause a spurious trip.

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