Landis & Staefa Division
CC1N7421E
December 04, 1998
7/16
At mains voltage U
N
= AC 230 V
Detector voltage across terminals 1 and 2 or ground
(AC voltmeter Ri
≥
10 M
Ω
)
AC 115...230 V
Switching thresholds (limit values)
Switching on (flame on) DC ammeter, Ri
≤
5 k
Ω
)
≥
DC 1 µA
Switching off (flame off) DC ammeter, Ri
≤
5 k
Ω
)
≤
DC 0.5 µA
Requested sensor current for reliable operation
≥
2 µA
Max. short-circuit current across terminals 1
and 2 or ground (AC ammeter, Ri
≤
5 k
Ω
)
AC 50 µA
Note:
With the same flame quality, the detector current with LMG2... is lower than with
LGB2...!
Flame supervision takes place by making use of the conductivity and rectifying effect
of hot flame gases.
The flame signal amplifier responds only to the DC current component of the flame
signal.
⇒
A short-circuit between detector electrode and ground causes the burner to initiate
lockout
For detector currents, refer to «Technical data».
C
Electrolytic capacitor 100...470 µF; DC 10...25 V
FE
Detector electrode
M
Microammeter (Ri max. = 5000
Ω
)
Flame supervision with
detector electrode
Measuring circuit
L M G 2 ...
1
7 4 2 1 v 0 1 /0 5 9 8
M
C
+
+
-
F E
Legend
