INFICON
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(WD) 724-250 450 650 -Low Voltage Operating Manual 220627.docx
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3.
Models (sensors included)
Model
Used for
724-250-G1
two channels(sensors)
724-450-G1
four channels(sensors)
724-650-G1
six channels(sensors)
4.
Function
After connecting each detector and applying power, the green LED on each channel will flash as
the pre-heat process commences. After approximately 4 minutes the green LED will illuminate
permanently, and the sensor is fully operational. Each channel has one yellow and two red
warning LEDs. The yellow LED indicates a low-level gas leak (above alarm threshold C) whilst the
two red LEDs indicate gas concentrations above thresholds B and A.
When gas is detected above the respective alarm threshold the appropriate LEDs will flash until
the appropriate time delay has expired when it is permanently illuminated, and the corresponding
relay contacts change state. As the gas concentration subsides the LEDs and relays will return to
their normal state unless the ‘manual reset’ function has been selected. The audible alarm will
initiate if it is configured with the respective alarm threshold and cannot be muted. Technicians
can inhibit the alarm by selecting ‘Service Mode’.
4.1 AUTO/MANUAL ALARM RESET
DIP switch (5) n
o3 on each channel’s control card manages the alarm reset function. “ON”
enables Auto reset and “OFF” enables Manual reset, via pressing “Reset/Test/Service”
-button
(7).
4.2 ALARM TIME DELAY (T1)
DIP-switch (5) controls the alarm time delay for each channel.
no1
no2
on
on
No alarm delay
off
on
1 minute delay
on
off
10 minutes delay
off
off
30 minutes delay
4.3
RESET/TEST/SERVICE-BUTTON (7)
Reset/Test/Service-functions is accessible via a pushbutton on the cover.
P
ressing the “Reset/Test/Service”
-button (7) on any channel for 5 seconds initiates the test
program. This sequentially energizes each LED and relay at five second intervals. All LEDs on the
chosen channel will go out when the test program has started.
