Siemens LMV50 Series Manual page 60

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Building Technologies
Examples of external flame supervision with a reaction time of the external flame
safeguard of 1.4 second:
∂
At the basic setting for ReacTmeLossFlame of 0.2 second, safety time during
operation is less than 2.6 seconds (0.2 second + 1 second + 1.4 second)
∂
At the maximum setting for ReacTmeLossFlame of 3.2 seconds, safety time during
operation is less than 5.6 seconds (3.2 seconds + 1 second + 1.4 second)
Parameter ReacTmeLossFlame (0,2...3,2s)
Attention!
∂
The safety time in operation may only be extended if the applicable
standards for the application allow this
∂
For applications to EN 676 or EN 267, the basic setting for
ReacTmeLossFlame of 0.2 second must be retained so that safety time
during operation for internal flame supervision is kept below 1 second.
∂
The parameter is also effective when using an external flame safeguard.
However, as the internal reaction time of the LMV5 is already 1.2 seconds
and the reaction time of the external flame safeguard still has to be added to
this, a safety time during operation of less than 1 second is not possible
with external flame supervision
Basic Documentation LMV5...
4 Burner control
CC1P7550en
22.05.2018