GEM-II Multi-Purpose Gas Detector
Self Contained - GAS DETECTION DATASHEET
GEM-II Multi-Purpose Gas Detector
technical drawing
GEM-II multi-purpose gas detector represents excellent value for the
end user. They are available in one or two channel configurations
accommodating accurate “smart” sensors and providing a wide range of
features. These features include CSA, UL and C-Tick certifications, RoSH
compliant circuit boards, two 5-amp dry contact relays, electronic
adjustable set points, audible alarm, time delays, analog output,
pluggable wiring terminal, rugged polycarbonate enclosure with hinged
door, Lexan label, and optional 4-digit display.
KEY FEATURES
» Single or dual channel operation
» Network multiple units
» Integral or remote sensors
» Integral plug and play “smart” sensors
» 4 - 20 mA linear output signal
» Three conduit entry ports
» Thermal resetting fuse
» LED light indicators
» Two 5-amp SPDT relays
» Economical
» CSA, UL & C-Tick certified
APPLICATIONS
» Parking Garages
» Repair Shops
» Ice Cleaning Machine Rooms
» Manufacturing Plants
» ... and many more
sample engineering specifications
Vehicle Exhaust Detection System for Carbon Monoxide & Nitrogen Dioxide
Supply a dual channel, self-contained gas detection system, model GEM-EECOEND, for the monitoring of carbon monoxide (gas engine exhaust) and nitrogen
dioxide (diesel engine exhaust), housed in a rugged, wall mount, dripproof PVC
enclosure with hinged, secured door. System power shall be 24 VAC nominal. The
system shall have two integral electrochemical sensors, one CO with measurement
range of 0 - 200 ppm CO in air and one NO2 with measurement range of 0 - 10 ppm
NO2 in air. Area of monitoring coverage is up to 5,000 - 7,000 ft2 per sensor.
The monitor shall provide an LED indicating light for power, low alarm, high alarm,
and fault condition plus channel indication LEDs, one audible alarm with silence
push-button and two SPDT dry contact alarm relays, each rated 5 A at 240 VAC. The
system must be accurate enough to measure to government workplace hazardous
gas exposure standards. The system shall also provide field adjustable time
delays for “delays on make” and “delays on break” for each sensor to allow custom
configuration of fan control by the system relays, if desired.
The controller shall provide a circuit test button to allow the user to confirm system
operation and exhaust fan control from the panel. The controller shall also provide
a push-button to allow the user to override the system control and operate exhaust
fans continuously for 15-minute segments to evacuate air from specific parts of the
parking garage. Installation height for the gas detection controller with integral CO
& NO2 sensors is 4 - 6 ft from the floor.
System operation shall be as follows: System relays are normally energized in
non-gas-alarm state so they act in failsafe operation. Upon detection of 25 ppm CO
in air or 0.5 ppm NO2 in air, the system shall illuminate the Low alarm LED (amber)
and the low gas alarm relay shall de-energize activating single-speed exhaust fans
or low speed of twospeed exhaust fans plus make up air fans. Upon detection of
100 ppm CO in air or 2 ppm NO2, the system shall illuminate the High alarm LED
(red), the system audible alarm will be activated and the high gas alarm relay
shall deenergize activating high speed of two-speed exhaust fans or remote alarm
devices. Audible alarm can be silenced from the front panel push button. In the
event of a fail condition, the system audible alarm shall be activated and the fail
LED on the front panel shall illuminate red.
The contractor shall provide all wiring, conduit and interconnection required
for a successful installation. System should be tested and commissioned after
installation, with a report provided after the site visit.
More specification samples are available at www.critical-environment.com.
© 2011 Critical Environment Technologies Canada Inc. | Data subject to change without notice. | Toll Free: +1.877.940.8741 | www.critical-environment.com
Self Contained - GAS DETECTION DATASHEET
GEM-II Multi-Purpose Gas Detector
WIRING
Type A, B & D
Type E
technical specifications
GAS TYPE
Carbon Monoxide (CO)
Nitrogen Dioxide (NO2)
Nitric Oxide (NO)
Oxygen (O2)
Sulphur Dioxide (SO2)
Combustibles (solid state)
Refrigerants (R12, R22, R134A, R401A, R402A,
R404A, R407C, R410A, R422A, R422D, R438A, R507)
TVOCs (solid state)
MECHANICAL
Enclosure
Weight
Size
ELECTRICAL
Power Requirement
Current Draw
Outputs
Wiring
Fuse
CERTIFICATION
CSA, UL, C-Tick
ECO
END
ENO
EO2
ESO
SCB
SR2
SOS
GEM-AECO
GEM-AEND
GEM-AENO
GEM-AESO
GEM-AEO2
GEM-B
GEM-BSCB
GEM-BSR2
GEM-BSOS
DUAL CHANNEL MODEL
General purpose PVC
450 g (1.0 lb)
5.3” x 6.8” x 2.6” (135 mm x 173 mm x 66 mm)
Integral carbon monoxide (CO), remote combustible
Integral & remote sensors, carbon monoxide (CO)
Integral carbon monoxide (CO), remote nitrogen
dioxide (NO2)
GEM-DECO-SCB
GEM-DECO-ECO
GEM-DECO-END
Integral carbon monoxide (CO), remote nitric oxide (NO) GEM-DECO-ENO
15 - 30 VDC or 12 - 28 VAC
Approximately 125 mA
4 - 20 mA linear (single)
VDC three-conductor shielded
VAC four-conductor shielded
Automatic resetting thermal
ENVIRONMENTAL (sensor dependant)
Operating
Temperature
Humidity
product codes
SINGLE CHANNEL MODEL
Integral sensor, carbon monoxide (CO)
Integral sensor, nitrogen dioxide (NO2)
Integral sensor, nitric oxide (NO)
Integral sensor, sulphur dioxide (SO2)
Integral sensor, oxygen (O2)
Remote sensor
Remote sensor, combustible gases (solid state)
Remote sensor, refrigerants (solid state)
Remote sensor, TVOCs (solid state)
-20°C to 50°C (-5°F to 120°F)
15 - 90% RH non-condensing
Certified
GEM-DEO2-EO2
GEM-DEND-END
Integral & remote sensors, nitric oxide (NO)
GEM-DENO-ENO
Integral, carbon monoxide (CO) & nitrogen dioxide (NO2) GEM-EECO-END
Integral, carbon monoxide (CO) & nitric oxide (NO)
GEM-EECO-ENO
Integral, carbon monoxide (CO) & oxygen (O2)
GEM-EECO-EO2
Integral, carbon monoxide (CO) & sulphur dioxide (SO2) GEM-EECO-ESO
Integral, nitrogen dioxide (NO2) & sulphur dioxide (SO2) GEM-EEND-ESO
Integral & remote sensors, oxygen (O2)
Integral & remote sensors, nitrogen dioxide (NO2)
OPTIONS (to be added to the end of the product codes on left)
LED digital display
120 VAC powered version
Enclosed external transformer, 120 - 22 VAC
ACCESSORIES
Calibration kit, 15 L or 17 L cylinder, 0.5 LPM flow
regulator
Calibration kit, 34 L, 58 L, 75 L, or 103 L cylinder,
0.5 LPM flow regulator
N
J
TIB-2250
CET-8000-CK1
CET-7150-CK1
© 2011 Critical Environment Technologies Canada Inc. | Data subject to change without notice. | Toll Free: +1.877.940.8741 | www.critical-environment.com
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