Micro-switch
Intrinsic Safety
1
Micro-switch
working mode of the Main Alarm relay
2
Micro-switch
Memory maintenance
3
Micro-switch
Oxygen mode Inserting
4
8
Zon 1 Zon 2 Zon 3
e
e
e
1 2
3 4
When the microswitch is set to OFF, the control unit prepares to detect explosive or toxic gas.
The display changes color and turns Green.
WARNING! By selecting the oxygen detection, the entire control panel will be enabled for the detection of
OXYGEN, and not other types of Gas.
Switch 4 - Selection of the ECU in OSSIGENO detection mode
When the microswitch is set to ON, the device IS PREPARED FOR OXYGEN DETECTION: the display changes color
and becomes BLUE.
Switch 3 - Maintenance of alarm memory
When the microswitch is set to ON, the equipment STORES the alarm occurred by flashing the general alarm LED,
until the RESET button is pressed.
By setting the microswitch to OFF, the equipment DOES NOT MEMORIZE the alarm occurred, and the relay
switches off when the connected probe no longer detects gas; in compliance with the Regulation, this function
becomes active only when the detection of Toxic Gases (reading in "ppm") is selected.
In the
position - Continuous function, the relay remains closed until the
button is pressed.
ON
RESET
In the
position - Impulse function, the relay remains closed for 5 seconds, and then disenergizes afterwards.
OFF
Switch 2 – Functioning Mode of main alarm relay.
Note: the general alarm relay (MAIN ALARM) in the idle state appears as shown in the wiring diagram on page
In the
position
OFF
, the positive safety function is disabled. The relay switches only when the control unit enters the
state of MAIN ALARM.
In the
position,
ON
the intrinsic safety function is enabled. The relay is energized immediately after performing the
preheating phase, therefore the arrangement of the NO and NC contacts is inverted compared to what is indicated on
the wiring diagram on page. 5. In this operating mode the relay switches, in addition to when the control unit is in a
general alarm status (MAIN ALARM), even when the control panel has a fault or is switched off (disconnected).
In the
position, the
safety function is disabled.
OFF
intrinsic
In the
position, the
safety function is enabled.
ON
intrinsic
Switch 1 – Selection of the
safety
intrinsic
