Siemens LFS1.11A2

44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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Line ID: @add11 Wechat ID: add0883001122
Design (continued)
Flame supervision
Flame detector
Data Sheet
QRA2 / QRA2M, QRA10 / QRA10M
N7712
QRA4 / QRA4M
N7711
RAR9
N7713
Ionization probe (must be supplied by customer)
---
Using an ionization Flame supervision by making use of the electrical conductivity of the flame in
probe conjunction with the rectifying effect is only possible with gas and blue-flame burners.
Since the flame signal amplifier responds only to the DC component of the flame signal
(ionization current), a short circuit between the flame detector and functional earth
cannot simulate a flame signal.
Single-electrode operation, i.e., ignition and supervision with a single electrode, is not
possible. Do not activate the test mode switchover using terminal 6 during flame
supervision with ionization probes. Terminal 6 must be connected directly to the phase
conductor at terminal 1 in this case.
Using an ionization
probe and a UV
flame detector QRA
It is possible to connect an ionization probe and a UV flame detector QRA to the
LFS1.2... at the same time. The flame assessment behaves as follows:
Ionization probe
UV flame detector QRA
LFS1.2 flame assessment
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
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Building Technologies CC1N7782en 18.04.2018