Switch 1
Intrinsic safety selection
Switch 2
Main alarm relay functioning mode
Switch 3
Maintaining of the memory of alarm,
only when you set the CO gas
Switch 4
Selecting OXYGEN mode
Deleting or disabling the probes
monitored gas type selection
Power terminal block
Signal terminal block
S1
S2
S3
1 2 3 4
external push-button
terminal block
2 - GENERAL DESCRIPTION OF THE CENTRAL UNIT
3
c)
ppm
Toxic gas
The letters
means when the connected probe detects
.
The letters
means when the connected probe detects
.
LEL
Explosive gas
d)
The timing symbol lights when the device is in warm up phase, at the same time its begins the count down.
The exchange of data of every connected probe is every about 4 seconds.
The numbers in the rectangle “1 2 3 “ are the probe connected.
b)
1)
During warm up the control unit is not able to detect the presence of gas.
LED
. It blinks for about 2 minutes (warm up time) when the mains power is supplied. When ready, the LED stays on
without blinking.
ON
2) BATTERY LED
. It lights up (fixed) when no mains power is present and the control unit is supplied by a 12Vdc battery.
It blinks when the battery is flat.
5) TEST BUTTON
. Pressing and holding down this button, you can obtain a gas leakage simulation. In order to perform this
operation no failures or alarms should be present.
4) OVER LOAD BATTERY LED
. If this Led turns on, it means the battery is not connected properly, or it has an anomalous
voltage absorption.
6) RESET BUTTON
. This button is pressed to clear all memories, or to restore the control unit after a failure.
8) 2nd Pre Alarm LED
. This LED will light up when the gas concentration level has reached 13% of LEL (EXPLOSIVE GAS) or
200 ppm (TOXIC GAS) and the
relay contact is closed. The buzzer will issue a low frequency sound.
2nd threshold
7) 1st Pre Alarm LED
. This LED will light up when the gas concentration level has reached 8% of LEL (EXPLOSIVE GAS) or 120
ppm (TOXIC GAS) and the
relay contact is closed. The relay disenergizes when the 13% of LEL, or 200ppm
threshold is exceeded.
1st threshold
9) MAIN ALARM LED
. This LED will light up when the gas concentration level has reached 20% of LEL (EXPLOSIVE GAS) or
300 ppm (TOXIC GAS) and the
relay contact is closed. The buzzer will issue a high frequency sound.
MAIN ALARM
The relay disenergizes when dropping below the 13% of LEL, or 200ppm, threshold.
11) DISPLAY.
The display below is represented with all its segments and indications.
10) FAULT LED
. This LED blinks when one of the connected probes is faulty, if there is an interruption in the cable connection, or
if an error was made during wiring. When this LED is blinking, the device is no longer capable of detecting. To reactivate the
device, the damaged probe must be repaired or disabled using the internal micro-switch (see
chapter 6) and then
the RESET button must be pressed.
page 10,
3) OVER LOAD PROBES LED
. If this LED turns on, it means there is a short circuit or high current absorption in the probes.
a)
The number on the display indicates the concentration of gas detected.
c
000
a
d
LEL
ppm
1 2 3
b
