AIR QUALITY
VERIS INDUSTRIES
800.354.8556
+1 503.598.4564
www.veris.com
Easy Control of Ventilation in
Parking Garages and Mechanical Areas
Carbon Monoxide Sensors
GW
GMxA
DESCRIPTION
G Series carbon monoxide sensors maximize energy savings, while ensuring optimal
ventilation in parking garages and other mechanical areas. The sensors allow
ventilation systems to be controlled by the amount of CO present in a location. The G
Series detects uctuations in CO levels, and it signals air systems to provide an inlet
of fresh air optimal for the space at a given time. In this manner, the ventilation fan
does not need to run continuously, saving energy and reducing maintenance costs.
Upon alarm, the G Series will alert those in the area with both an audible and a
visual alarm.
The G Series devices are equipped with a relay contact that closes when CO level is
below 25 ppm and opens when the CO level is above 25 ppm. Sensor removal, power
interruption, or cut wires cause the external contactor (normally closed) to open and
start the fan. Minimum relay cycle time is 3 minutes to prevent fan short-cycling.
Audible Alarm: 85 dB alarm sounds if CO level rises above 100 ppm for 30 minutes.
APPLICATIONS
● Controlling parking garage ventilation
● Ensuring OSHA air quality compliance in commercial buildings and factories
● Vehicle bays (ambulance/re/taxi stations)
● Mechanical rooms
● Sally ports
SPECIFICATIONS (GMxA Monitor)
Inputs Detect contact closure from sensor relay. Four channels. 24VDC loop
Output Form C (SPDT) relay. 5A@30VAC
Alarm Indicators Four, 10 mm red LED indicates alarm status
Power Indicator Green LED indicates power supply operation
Operating Environment -20° to 50°C (-4° to 122°F); 0 to 90% RH non-condensing
Physical NEMA 1, metal enclosure, white
SPECIFICATIONS (G Series Sensor)
Input Power 12-30VDC/24VAC, 0.3A@12VDC, 0.3A@24VDC
Sensor Digitally-proled Metal Oxide Semiconductor (MOS)
Sensor Life 5-10 years typical, replaceable
Detection Range 0 to 200 ppm
Analog Output 3-wire sourcing 4-20mA or user-selectable 0-5V/0-10V (Specify mA or voltage)
Output Scaling User-selectable 100 ppm F.S. or 200 ppm F.S.
Response Time 2 minutes 30 second sample interval cycle
Relay Output N.O. Form A (SPST) 8A@30VAC/VDC (use with N.C. contactor)
Relay Setpoint 25 ppm
High Limit Setpoint 100 ppm for 30 minutes
High Limit Alarm Audible, 85 dB, resets below 100 ppm; (Solid-state contact for -AS version)
High Limit Contact (-AS models) 250 VAC/DC, 120 mA max. Ron 35 Ω
LED Indicators Normal=Green; Call for ventilation=Red; High-limit alarm=Flashing Red
Operating Environment -20° to 50°C (-4° to 122°F); 0 to 90% RH non-condensing
Coverage 5000 sq. ft. typical (465 sq. m)
Physical white powder coat over steel
FEATURES
● Long-life replaceable sensor element
● Microprocessor controlled...excellent stability
● No calibration required...easy maintenance and worry-free operation
● Metal oxide semiconductor (MOS) sensor
● Interface to DDC system, GM panel, or direct fan control...easy integration with
existing systems
● Onboard fail-safe 5 Amp alarm relay for direct ventilation fan control...simple
operation
● Interface to control system via selectable 4-20mA or 0-5/0-10VDC output...
application exibility
● Audible exposure alarm 100 ppm, 30 minutes per UL 2034...easy
troubleshooting
G SERIES
HQ0001743.B 01131
(2 pages)
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