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Functional Safety Manual
IP101/FSM, Rev AA
January 2012
Horizontal Float Switch
PROPOSED PROOF-TEST PROCEDURE
According to Section 7.4.3.2.2 (f) of the standard IEC
Suggested Proof-test
Table 7.
Suggested
(Low Level Alarm)
Table 8.
Suggested
(High Level Alarm)
The suggested
Step | Action |
1Inspect the accessible parts of the level switch for any leaks or damage
2Bypass the safety function and take appropriate action to avoid a false trip
3Disable any filling mechanism and drain the vessel to force the switch to the
4Reinstate the filling mechanism so that the vessel refills and confirm that the normal operating state of the switch was achieved.
5Remove the safety function bypass and otherwise restore normal operation
Step | Action |
1Inspect the accessible parts of the level switch for any leaks or damage
2Bypass the safety function and take appropriate action to avoid a false trip
3Disable any drain mechanism and fill the vessel to force the switch to the
4Reinstate the drain mechanism so that the vessel refills and confirm that the normal operating state of the switch was achieved
5Remove the safety function bypass and otherwise restore normal operation
Proof Test Coverage
The Proof Test Coverage for the tests listed in the section “Proposed
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