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. +359.2.974 62 36, 974 62 37, 974 62 38; Fax: +359.2.974 62 04
Web Site:
E-mail: delta@deltainst.com
