Siemens LMV37.4 Series - Yellow Flame Detector QRB4

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Building Technologies Basic documentation LMV37.4... CC1P7546en
4 Technical Data 17.12.2018
4.4.4 Yellow flame detector QRB4
Open-circuit voltage at terminal QRB4
(X10-05 pin 3)
Approx. 5 V DC
Permissible length of QRB4 detector
cable (laid separately)
3 m (wire to wire100 pF/m)
Threshold values when flame is supervised by QRB4
Start prevention (extraneous light) Flame intensity (parameter 954) ≥10%
Operation Flame intensity (parameter 954) >16%

Note!
In the case of the QRB4, the maximum intensity display is limited to approximately
40% due to the system (parameter 954).

Note!
Connection of QRB4 cables!
Blue cable of QRB4 to terminal X10-05 pin 4.
Black cable of QRB4 to terminal X10-05 pin 3.
Otherwise, the QRB4 will not work.