Siemens LMV27.100x2 Basic Documentation page 27

Measuring circuit for
detector current
measurement
Building Technologies
Threshold values when flame is supervised by an ionization probe:
- Start prevention (extraneous light)
- Operation
100
90
80
70
60
50
40
30
20
10
0
0 2
Figure 5: Ionization input at AC 230 V
Ionization probe
M
LMV...
X10-05/2
C
X10-05/1
Figure 6: Measuring circuit for ionization probe
Basic Documentation LMV27...
4 Technical Data
Intensity of flame (parameter 954) ≥18%
Intensity of flame (parameter 954) >24%
Ionization input
4 6 8
Ionization current in µA
Legend
C Electrolytic capacitor 100...470 µF; DC 10...25 V
ION Ionization probe
ION
Microammeter, Ri max. 5,000 
M
10 12 14
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