Service; Maintenance; Availability Of Services; Operation Modes And Proof Test - Siemens SITRANS F Additional Operating Instructions

SITRANS FX330

4.1 Maintenance

You must follow the maintenance instructions given in the handbook [N1].

4.2 Availability of services

The manufacturer offers a range of services to support the customer after expiration of the
warranty. These include repair, maintenance, technical support and training.
INFORMATION!
For more precise information, please contact your local sales office.

4.3 Operation modes and proof test

Continuous and high demand mode
If the flowmeter is operated in continuous or high demand mode within the specified
environmental limits, the device needs no proof test during its useful lifetime (for details refer to
Useful lifetime
respectively.
Low demand mode
The flowmeter includes a comprehensive set of online diagnostic tests which are executed fast
and frequently, resulting in a very low mean down time. Assuming reasonable low repair and
restoration times as well, the device fulfils SIL2 compatible PFD values as well during the whole
useful life time without additional proof tests.
Proof test
Proof tests are required in case of:
• Deployment under extreme conditions beyond the device's specification. In this case,
environmental conditions might increase the failure rate. To keep undetected failures small
such deployment requires more frequent proof tests. For details refer to
page 29, operational limits as set forth in SAC 11 must not be exceeded.
• Achieving the required PFD
WARNING!
SIS engineers must calculate the interval of proof tests based on the required PFD
For this purpose, the following tests can be performed. The diagnostic coverage of all tests
together is nearly as good as the tests and procedures in the factory which were executed during
or at the end of the production cycle. Only flow sensor calibration is missed here which requires
a reference meter.
10/2017 - A5E40875009-AB EN
on page 29). Observe SAC 11 regarding useful lifetime and constant failure rates,
over time.
AVG
www.siemens.com/flow

SERVICE

4
Useful lifetime
on
.
AVG
19