What operators and supervisors must know about trips, testing and the control of overrides
The flyer below is the printable A4 version. Use the buttons above to download it or the request form.
Panel and field operators, shift supervisors, maintenance technicians and operations engineers who authorise or apply SIS bypasses
A safety instrumented function that is bypassed is a hole in the safety case, and most sites cannot say at any moment how many holes are open. This half-day session explains in plain terms what an SIS is, why its trips are set where they are, what a proof test does and what IEC 61511 requires when a function is bypassed, overridden or found to have failed. It ends with a review of the participants' own override procedure and register.
Layers of protection and the role of the SIS · SIF anatomy: sensor, logic solver, final element, voting · SIL, PFD and why trips must not be moved casually · demand, spurious trip and degraded modes · diagnostics alarms and what operators should do
IEC 61511 clause 11 and 16 requirements for bypass and maintenance · bypass authorisation, time limits, compensating measures · override register and shift-handover practice · proof testing and partial-stroke testing from the operator's side · review of the site's own procedure · quiz and certificate
IEC 61511IEC 61508ISA-84.91.01ANSI/ISA-18.2API RP 754Send a short brief — plant, service of interest and what you need to achieve — and a Cerasus engineer will respond with a proposed scope and next steps.
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