Siemens CALOMAT 6 Instructions Manual page 14

Siemens AG
Checking safety
You should regularly check the safety function of the entire safety circuit in line
with IEC 61508/61511.
The testing intervals are determined during circulation of each individual safety
circuit in a system (PFD
but max within one year. We recommend a prove test interval of once per moth.
To detect dangerous undetected faults the CALOMAT 6 analog output shall be
checked with following test:
To execute the safety proof test both tests (1 and 2) must be performed.
Proof test 1 consists of the steps described in table 3-1.
Step Action
1
2
3
4
5
Table 3-1 Steps for Proof Test 1
Proof test 2 consists of the steps described in Table 3-2.
Step Action
1
2
3
4
5
6
Table 3-2 Steps for Proof Test 2
This test will detect more than 90% of possible "du" failures in the Gas Analyzer
CALOMAT 6.
SIL Safety Manual CALOMAT 6 Gas Analyzers
A5E00729184-02, 07/2010
). Recommended prove interval depends on application
AVG
Bypass the safety PLC or take other appropriate action to avoid a false
trip
Generate or simulate an alarm condition to force the Gas Analyzer
CALOMAT 6 to go to the high alarm current output and verify that the
analog current reaches that value.
Generate or simulate an alarm condition to force the Gas Analyzer
CALOMAT 6 to go to the low alarm current output and verify that the
analog current reaches that value.
Restore the loop to full operation
Remove the bypass from the safety PLC or otherwise restore normal
operation
Bypass the safety PLC or take other appropriate action to avoid a false
trip
Perform Proof Test 1
Perform a two-point calibration of the Gas Analyzer CALOMAT 6
Perform a reference measuring with at least one measuring point
between min and max concentration. You must use a calibration gas
with a well known gas concentration. The expected result must have a
tolerance of not more than 5 %.
Restore the loop to full operation
Remove the bypass from the safety PLC or otherwise restore normal
operation
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