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Flame control (SIL 3, PL e)

The flame supervision device is a component of the automatic burner control unit which complies with EN 298.
Each burner is fitted with its own automatic burner control unit.

Requirement as per EN 746-2


Non-combusted gas in the combustion chamber → explosion

Determining the required SIL pursuant to IEC 62061

Frequency & exposure duration Fr: < 1 per h to ≥ 1 per day; > 10 min → 5 points

Probability Pr: without flame control, this event is likely to occur. → 4 points

Avoidance Av: avoiding the hazard is impossible. → 5 points

Effects: death, loss of an eye or arm

Determining the required PL pursuant to ISO 13849-1

Severity of injury S: severe (usually irreversible injury including death) → S2

Frequency and/or duration of hazard exposure F: frequent to continuous and/or long exposure to hazard → F2

Possibility of avoiding hazard or limiting harm P: hardly possible → P2


Enter details

Enter the calculated values in the adjacent “app” to determine the required safety level.

App: Determining the required SIL, PL




Select products











The required SIL and PL can be achieved with these products. The calculation (see below) provides verification of this.

Sensor and logic: automatic burner control unit PFU (the ionization electronic is a sensor combined with the logic system.)

Actuator: solenoid valves for gas VAS














The flowchart shows how the products are integrated into the application to achieve the required safely level.


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