Page 8
Description of Micro-switches
Installing, uninstalling or disabling probe
Through the Micro switches (see drawing below) on the control unit, you can to activate or to deactivate 4
Zo nes .
You can connect 4 probes to the BX444-Mc. The control unit is tested with the probes connected
In some installations, you may need only one probe. In this case we will proceed to disable a probe, to do this
select the switch of the probe (zone) concerned.
These micro-switches are also used to disable one or all probes in case of failure
N.B. The microswitches are also used for switching off in case of failure
A row of LEDs numbered from
1 to 4
and called PROBES has been fitted on the BX444-Mc. These LEDs are
lit with a 2 second frequency representing the connected probes, and indicate the probe being read on the
display.
In case of alarm: The LED that represents the probe stops for about 15 seconds. This is done in order to
identify the relevant zone or zones easily. The gas percentage measured by the probe appears on the display
and is maintained for 15 seconds. On the next pass, the LED (probe) will be maintained again and the alarm
will be issued.
In case of fault: The LED of the relevant probe starts blinking and remains lit. The display will show the
“FAU”
(Fault) fixed indication, and the buzzer will issue a continuous sound until:
1) The repair has been carried out;
2) The relevant probe has been disabled using the micro-switch.
1
2
4
3
Sensors
Probe Identification
Leds
from n°1 to n°4
Components and Commands continue
Zone1 Zone2 Zone3 Zone4
Micro-switch (1) to enable or to disable the probe.
Position ON enabled - In position OFF disabled
The simultaneous and prolonged pressure for 5 sec of the "TEST" and "RESET" buttons enables the test-on
mode in which the control unit does not switch the general alarm relay for a period of 15 minutes; Not even
pressing the external manual button.
A further keypress in the same mode extends the time of 15 minutes to a maximum of 60 minutes.
In this mode, before the passage from the current channel to the next, the "TESt-On" string is displayed followed
by the minutes of the general alarm relay being switched off.
You can terminate this mode before the natural deadline by resetting the control unit by pressing 3 consecutive
times and within 5 seconds the RESET button.
Mantinance Test
