Flame Detection Sensitivity - Siemens LMV37.4 Series Basic Documentation

Building Technologies

7.2.6 Flame detection sensitivity

For applications with a high degree of modulation (e.g. 1:15 / 1:20), it may be necessary
to increase the flame detection sensitivity. This can be carried out via parameters for
flame detection with ionization probe or UV flame detector QRA.
The ignition (phases 40...52) always takes place with standard flame sensitivity.
The high flame sensitivity for ionization probe or QRA is only activated during operation
(from phase 60).
This means that the ignition load must be set so that the burner ignites reliably with
regular flame sensitivity.
It is also possible to deactivate the more sensitive flame detection for the output range
above the ignition point (default setting curvepoint P4, i.e. 50% of the theoretical output
of the LMV37.4).
No. Parameter
Setting the flame signal sensitivity ionization probe / QRA in operation (≥
phase 60)
197
0 = standard
1 = approx. twice as high sensitivity
Maximum output for high flame sensitivity
2 = no maximum output for high flame sensitivity
198
...
3 9 = deactivation of the high flame sensitivity from the curvepoint P3
Basic documentation LMV37.4...
7 Basic unit LMV37.4
...
P9
37/267
CC1P7546en
17.12.2018