2
13/12/2017
System description
AGDS-2em
The AGDS-2em system comprises of a mains powered main control panel capable of operating two sensors, either combustible
or Carbon Monoxide gas or a mixture of both. The sensors are pre-calibrated by Medem (UK) Ltd such that they only require to
be connected to the panel and functionally tested.
In the event of a high alarm from one of the sensors the system will isolate the gas supply by closing a connected electric control
valve. Emergency stop buttons and Thermal Links can be fitted and a fire alarm can close the gas valve when connected to the
panel.
Panel Buttons:
Emergency stop button.
Reset button
Press and hold the reset button (2’s) when power is first
applied to enable gas.
Control Panel
LED indications:
Power On
Green
High Alarm
Flashing red
High Alarm & Gas isolated
Permanent red
Low Alarm
Flashing red (every second)
Gas On
Yellow
EM Stop
Yellow
Alert
Yellow
Low Voltage Gas Detectors
Combustible detectors are pre calibrated at 5% LEL (Pre alarm) and 10% LEL for the High alarm.
Carbon Monoxide detectors are pre calibrated at 80ppm (pre alarm) and 100ppm for high alarm.
Connect a detector to either the “detector 1 terminals”(
6
&
7
) or “detector 2 terminals”(
8
&
9
), each detector has a rotary address
selector switch (0-F) set to address 1 or 2 depending on which terminal has been used. Once connected and addressed you are
required to enable the channel using the “channel enable switch”(
12
).
Each sensor unit has an LED which shows green when power is applied.
Note: There is a warm up period after initial power up of approximately 90 seconds. During this time the green LED will flash once
per second and the output signal will be inhibited. This is to prevent spurious alarms. After the warm up period and on application
of gas, the red LED will light when a high gas alarm level is reached.
A detector incorrectly addressed or a channel enabled when not in use will cause a “sensor Alert state” (yellow LED
20
); which
indicates that a detector is not being recognised on the current setting’s - this can also be as a result of a connection issue with the
wiring.
When first powered or after a loss of power press and hold the reset button for 2 seconds to start the system and
open the gas valve.
