Satel DG-1 User manual

®
DG-1
DIGITAL GAS DETECTORS
dg1_e 04/06
The DG-1 microprocessor-based digital gas detectors are characterized by reliability
and low current consumption. Due to a digital temperature compensation feature they
can operate within a wide temperature range. Gas concentration above the threshold
level triggers visual and audible alarm signals. The detectors can be used as part of
a security system, or as a stand-alone device.
The DG-1 series of digital gas detectors includes the following products:
DG-1 CO - carbon monoxide detector;
DG-1 LPG - propane-butane gas detector;
DG-1 ME - natural gas (methane) detector;
DG-1 TCM - soporific gas detector (e.g. chloroform vapors).
Fig. 1. The electronics board of DG-1 CO, DG-1 LPG, DG-1 ME detectors. The
electronics board of DG-1 TCM detector differs in size and shape of the gas sensor
installed.

Explanations to Fig. 1:
1 – terminals:
NC – relay (NC)
TMP – tamper contact
COM – common ground
12V – power supply input
2 – LED indicator. Indicates by blinking activation, trouble and alarm of the detector.
Depending on the detector type, the following LED colors are used:
- red – DG-1 CO
- green – DG-1 LPG
- yellow – DG-1 ME
- blue – DG-1 TCM
3 – alarm relay, type NC (normally closed).
4 – buzzer. Indicates acoustically activation, trouble and alarm of the detector.
5 – gas sensor.
6 – tamper contact. Opening of the housing is signaled on TMP terminals.
7 – fixing screw hole.
8 – buzzer ON/OFF pins. Set the jumper to enable the audible signal, remove the
jumper to disable it.
1. Alarm signaling
Depending on the detector type, the conditions of alarm signaling vary. They are
described in Table 1. Additionally, the DG-1 LPG and DG-1 ME detectors feature the
prealarm function.
DG-1 CO DG-1 LPG DG-1 ME DG-1 TCM
Gas concen-
tration to
trigger alarm
50ppm for 75 minutes
100ppm for 25 minutes
300ppm for 1 minute
20% lower explosive
limit 3000ppm CHCl3
Gas concen-
tration to trig-
ger prealarm
- 10% lower explosive
limit -
Table 1. Conditions of alarm/prealarm signaling by the detectors.
Gas concentration reaching the dangerous level will trigger the alarm signal (visual
and audible) and open the alarm relay. The alarm is signaled by long sounds and LED
blinking, separated by long intervals (1 second LED blinking / sound, 1 second
interval, etc.). The alarm signaling is on for the whole duration of dangerous gas
concentration. Also the relay will remain open until the gas concentration drops below
the alarm level. The gas sensor reaction to a decrease in the dangerous gas
concentration is delayed, hence the alarm signaling can stop even a few
minutes after the gas concentration has dropped below the alarm level.
The prealarm is signaled by short sounds and LED flashes, separated by long
intervals (0.25 second LED blinking / sound, 1.75 second interval, etc.). The signaling
continues as long as the methane / propane-butane concentration is above the 10%
lower explosive limit, but just below the 20% lower explosive limit. The prealarm has
no effect on the alarm relay status.

2. Autodiagnostics
The detector is monitoring the supply voltage (voltage drop below 9V (±5%) will trigger
a failure alarm) and testing performance of the gas sensor. Troubles are indicated by
short sound signals and LED flashes separated by short intervals (0.25 second LED
blinking / sound, 0.25 second interval, etc.).
3. Installation and commissioning
The DG-1 digital gas detectors are designed for indoor installation.
Considering specific character of the gases to be detected, the DG-1 TCM
and DG-1 LPG detectors should be mounted in low position, just above
the floor, the DG-1 ME detector in high position, just under the ceiling, and
DG-1 CO detector at a height of about 1.5 meter.
1. Open the housing as shown in Fig. 2.
Fig. 2. Opening the detector housing.
2. Remove the electronics board.
3. Make suitable openings for screws and cable in the rear housing panel.
4. Pass the cable through the opening prepared.
5. Secure the rear housing panel to the wall.
6. Fasten the electronics board.
7. Connect the leads to corresponding terminals.
8. Using the jumper, decide whether the buzzer is to be enabled, or not.
9. Close the detector housing, making sure that the indicators on the cover and on
the rear housing panel are aligned (see Fig. 3).
10. Switch on power supply of the security system (when the detector is used as part
of the security system), or the detector itself (when the detector is a stand-alone
device). Putting the detector into operation is signaled by three short sounds,
accompanied by blinking of the LED.
Note: During the detector operation the gas sensor heats up.

Fig. 3. Alignment of the indicators when closing the detector housing.
4. Technical data
Nominal supply voltage (±15%).......................................................................... 12V DC
Mean current consumption (±10%):DG-1 CO..........................................................12mA
DG-1 LPG........................................................35mA
DG-1 ME..........................................................35mA
DG-1 TCM .......................................................80mA
Operating temperature range ........................................................................-10...+55°C
Dimensions ................................................................................................... ø97x36mm
The latest EC declaration of conformity and product approval certificates
are available for downloading on website www.satel.pl
SATEL sp. z o.o.
ul. Schuberta 79
80-172 Gdańsk
POLAND
tel. + 48 58 320 94 00
[email protected]
www.satel.pl