Delta DG510/CG User manual

Microprocessor based Gas Detector for Carbon Monoxide (CO)
series “GAS ALARM DG510/CG”
 2 Alarm Levels
 Visual and Audible Signalization of
Activated Alarm Levels
 2 SPDT 5A/250V Output Relays
 Electrochemical Gas Sensor
I. APPLICATION
The single-channel gas detector “DG510/CG” is purposed for signaling anytime, when
concentration of carbon monoxide (CO) exceeds permissible limits. It is applicable in
underground garages, automobile workshops and engine testing stands, chemical industry
factories and other areas, where toxic CO concentrations can be found. The sensor element is
an electrochemical cell, which eliminates any possibility of false alarms. The gas detector
has a standard range of 0÷350 ppm CO (up to 1000 ppm on request) and two alarm levels –
pre-alarm “ALARM 1” and alarm “ALARM 2” – connected with 2 SPDT 5A/250V output
relays. If the concentration of CO exceeds the set pre-alarm level an integrated buzzer starts
emitting repeated short beeps, the LED “ALARM 1” is lighted up and the output relay “REL
1” is activated. The relay output may operate a ventilation system in order to clear the air in
the room. When the concentration drops with 10% below the set pre-alarm value, the output
relay is deactivated. If despite the ventilation the CO concentration exceeds the set alarm
level, the buzzer starts emitting a continuous signal, the LED “ALARM 2” is lighted up and
“REL 2” output relay is activated, which can operate a siren, a semaphore system, barriers,
alarm lights or other systems to restrict the access of people to the dangerous area until the
concentration drops below the alarm level. To suit customer’s needs there is an option to
adjust the concentration values for pre-alarm and alarm levels via switches and a button,
placed on the circuit board.
DELTA INSTRUMENTS Ltd.
23 A. Saharov blvd., Mladost 1, 1784 Sofia, Bulgaria
Tel. [phone]; Fax: [phone]
Web Site: http://www.deltainst.com;E-mail: [email protected]

II. TECHNICAL SPECIFICATIONS
Power Supply 230V, 50Hz
Detected Gas CO
Range 0-350 ppm
Sensor Electrochemical cell
Pre-alarm level “ALARM 1” 50 ppm CO - adjustable
Alarm level “ALARM 2” 150 ppm CO - adjustable
Pre-alarm output signal “REL 1” SPDT relay, 5A/250V
Alarm output signal “REL 2” SPDT relay, 5A/250V
Signalization Audible 85dB/m + visual
Indication LED
Ambient temperature for sensors -10+50С
Reaction delay of sensors 60s
Dimensions of control unit 140 x 50 x 135 mm
Protection degree of control unit IP30
Weight 250 g
CONNECTION SCHEME
220VAC
REL1 REL2
NOTE: In larger areas can be connected several gas detectors parallely to
operate a common ventilation system.
III. MOUNTING INSTRUCTIONS
Mount the gas detector in areas with normal risk of fire at heights of 10-15 cm below
the ceiling or at the height of a man, measured from the floor.
When mounting, the following factors have to be considered:
vibrations presence
The Sensor is vibration-sensitive, so the gas detector should either be mounted in a
place where vibrations are not present, or measures for their reduction have to be taken.

dust and water presence
In areas with a high degree of dust loading, use a dust-proof filter, which at the same
time should not obstruct the freeway from gas to sensor. In damp areas a water drop
protection has to be made.
IV. OPERATING INSTRUCTIONS
The gas detector “Gas Alarm DG510/CG” is calibrated with a standard gas mixture
and by correct mounting no additional settings and calibration should be necessary. After
switching on the power supply follows an initial activation process of the sensor for 1-2 min.
After this process the gas detector enters a standard operation mode.
4.1. Visual and audible alarm
- Clean air
The green LED “ON” is blinking, no sound alarm
- CO concentration has reached or exceeds the pre-alarm level “ALARM 1”
The red LED “ALARM 1” is lighted up, repeated short beeps every 2s
- CO concentration has reached or exceeds the alarm level “ALARM 2”
The red LED “ALARM 2” is lighted up, continuous sound alarm
4.2 Programming the alarm levels of “Gas Alarm DG510/CG”
4.2.1 Setting the pre-alarm level “ALARM 1”
Switch G should be switched to ‘1’ (see Fig.1). Using the switches B, C, D and E can
be set the desired pre-alarm level, according to Table 1. Then the button should be pressed
and hold for about 10 sec. If the newly adjusted value is saved successfully the buzzer will
emit a short beep. After this procedure the switches should be put back to default positions as
shown in Fig. 1 („ABCDEFGH” = „00000000”).
4.2.2 Setting the alarm level “ALARM 2”
Switch H should be switched to ‘1’ (see Fig.1). Using the switches B, C, D and E can
be set the desired alarm level, according to Table 1. Then the button should be pressed and
hold for about 10 sec. If the newly adjusted value is saved successfully the buzzer will emit a
short beep. After this procedure the switches should be put back to default positions as
shown in Fig. 1 („ABCDEFGH” = „00000000”).

'1'
'0'
A B C D E F G H
54321 6 7 8
Button
Fig. 1
Switches B C D E ALARM 1 ALARM 2
0000 300ppm CO 300ppm CO
0001 275ppm CO 275ppm CO
0010 250ppm CO 250ppm CO
0011 225ppm CO 225ppm CO
0100 200ppm CO 200ppm CO
0101 175ppm CO 175ppm CO
0110 150ppm CO 150ppm CO
0111 125ppm CO 125ppm CO
1000 100ppm CO 100ppm CO
1001 90ppm CO 90ppm CO
1010 80ppm CO 80ppm CO
1011 70ppm CO 70ppm CO
1100 60ppm CO 60ppm CO
1101 50ppm CO 50ppm CO
1110 40ppm CO 40ppm CO
1111 30ppm CO 30ppm CO
Table 1
CAUTION: After going through the procedures in 4.2.1 and 4.2.2 the switches
should be switched back to default positions as shown in Fig. 1 („ABCDEFGH” =
„00000000”). It is not allowed to set as alarm level “ALARM 2” lower values than the
one, set as pre-alarm level ALARM 1, and vice versa.

V. GENERAL CONDITIONS
5.1. “DG510/CG” gas detector may be used only in applications, approved by its
manufacturer - DELTA INSTRUMENTS Ltd.
5.2. Test and calibration have to be made every 12 months. The test overall
performance will be ensured in a best way through a periodical maintenance servicing
contract with the manufacturer.
5.3. The safe operation guarantee is not valid, if the device is maintained with
unauthorized personnel or if the corresponding to the term of question Test and Calibration
Report is not available.
VI. If no other parameters are specified, the device is calibrated by the
manufacturer with values 50 and 150 ppm CO accordingly for pre-alarm and alarm
levels and by correct mounting no additional settings should be necessary.
CAUTION! When opening the housing, the gas detector should be
disconnected from the power supply. It is absolutely forbidden to change safety fuses or
other electronic elements, connected to the proper functionality of the gas detector!
VII. REPAIR
Any repair activities, concerning “GAS ALARM DG510/CG” have to be carried out
only in manufacturer “DELTA INSTRUMENTS” Ltd laboratories.