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Building Technologies Basic documentation LMV37.4... CC1P7546en
4 Technical Data 17.12.2018
4.4 Flame detector
4.4.1 Ionization probe
For continuous operation!
No-load voltage at ION terminal
(X10-05 pin 2)
Approx. U
Mains
Caution!
The ionization probe must be protected against electric shock hazard!
Short-circuit current Max. AC 1 mA
Required detector current Min. DC 2.3 µA, flame display approx.
30%
When the more sensitive flame
supervision is activated, the required
detector current is halved (see chapter
Flame detection sensitivity).
Possible detector current Max. DC 12…30 µA, flame display
approx. 100 %
Max. perm. length of detector cable
(laid separately)
3 m (wire–ground 100 pF/m)
Warning!
Simultaneous operation of QRA and ionization probe is not permitted!
Note
The higher the detector cable’s capacitance (cable length), the more voltage at the
ionization probe, and thus the detector current, drops. Long cable lengths plus very
highly resistive flames might necessitate low-capacitance detector cables (e.g. ignition
cable). In spite of technical measures taken in the circuitry aimed at compensating
potential adverse effects of the ignition spark on the ionization current, it must be
made certain that the minimum detector current required is already reached during
the ignition phase. If this is not the case, the connections on the primary side of the
ignition transformer must be changed and/or the electrodes relocated.
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