dunphy TD - Page 116

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 116 of 165 TD/TAD4 Manual Rev 4
Flame supervision with ionisation probe
Voltage at the ionization probe:
 Operation: AC 330 V ±10 %
 Test: AC 380 V ±10 %
Short-circuit current max: 0.5 mA
Required ionization current min: 6 µA
Recommended range of measuring
instrument: 0...50 µA
Perm. length of detector cable:
 Normal cable, laid separately.
(multicore cable not allowed) max. 80 m
 Shielded cable: max. 140 m (e.g.
high-frequency cable, shield connected
to terminal 22
Flame supervision with QRA…
Supply voltage:
 Operation: AC 330 V ±10 %
 Test: AC 380 V ±10 %
Required detector current min: 70 µA
Possible detector current:
 Operation: max. 680 µA
 Test: max. 1000 µA ¹)
Perm. length of detector cable:
 Normal cable, laid separately
(Multicore cable not permitted): max. 100m
 Shielded cable: max. 200 m (e.g. high-frequency cable,
shield connected to terminal 22)
Note1) During the pre-purge time with higher test voltage: self-ignition and extraneous light test