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Gas sampling and gas conditioning technology 4-1.1-ME
10.3 LIQUID- AND FLOW ALARM CARD LFC-2
The LFC-2 is a combined electronic card operating the flow alarm sensor FA1bi and the liquid alarm
sensor LA1.
Pulsating gas flow can release a unintentional flow alarm. To avoid this the LFC-2 is equipped with
slow operation -time lag to eliminate the alarm- and slow release -alarm with time lag. Times in be-
tween 3 and 13 seconds (3 seconds are factory-aligned) are continuously adjustable by the potenti-
ometers P5 and P6 (see Fig. 11, wiring diagram LFC-2). For more specific information about the liquid
alarm sensor LA1 and the flow alarm sensor FA1bi please see the data sheets 5-6.10.1 and 5-5.1.1.
The plan of terminal connections is displayed in the following chart.
V2-V5 Transistoren BC 239C
D3;D8-D12;D14 Dioden 1N4148
Relais K1;K2 max. 250V DC/AC 90W,250VA,1A
LFC-2 01E1385 T1=3,5VA Frontplatte 6TE
LFC-2CSS 03E2026 T1=7VA ohne Frontplatte
P5 = switch-off-hysterysis 3-13 sec.
P5 = Alarmfreigabeverzögerung 3-13 sek.
P6 = Alarmfreigabeverzögerung 3-13 sek.
P6 = switch-off-hysterysis 3-13 sec.
Steckerleiste DIN 41612 F-d/z
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