Dwyer Instruments SERIES CMS300 Catalog Page
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SERIES CMS300
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CARBON MONOXIDE TRANSMITTER AND SWITCH
Current/Voltage Selectable Output, Jumper Selectable SPDT Relay Contact
Transmitters
Gas Sensing
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The Series CMS300 Carbon Monoxide Transmitter and Switch provides a eld
selectable current or voltage output that is proportional to the carbon monoxide
concentration in underground parking garages, vehicle maintenance facilities, or
mechanical rooms. An integral relay can be used for alarm conditions and is congured
with preset jumper selectable ranges of 25, 60, or 150 PPM. Field calibration can be
done by using Model GCK-200CO-2000CO2 calibration gas, Model A-507 calibration
adapter, and the on board zero and span potentiometers.
FEATURES/BENEFITS
• Field selectable current or voltage analog outputs
• Integral SPDT relay contact for low or high alarm
• Jumper selectable alarm set points of 25, 60, or 150 PPM
• UL recognized carbon monoxide sensing element
• Field calibration kits
APPLICATIONS
• Garage or loading dock ventilation
• Vehicle maintenance facilities
• Mechanical room monitoring
MODEL CHART
Model Description
CMS300 Carbon monoxide transmitter and switch
DWYER INSTRUMENTS, INC. 232
SPECIFICATIONS
Sensor: Electrochemical, 5 years typical
lifespan.
Range: 0-300 PPM.
Output Drift: <5% per year in air.
Temperature Effect: ±2% over range.
Coverage Area: 7,500 ft
ft (15 m) radius.
Accuracy: ±5 PPM or 5% of reading for
0-300 PPM (whichever is greater).
Resolution: 1 PPM.
Temperature Range: -4 to 122°F (-20
to 50°C).
Storage Temperature: For best sensor
life, 32°F to 68°F (0 to 20°C).
Humidity Range: 15-90% RH constant;
0-99% RH intermittent.
Response Time: <45 s to 90% of nal
value.
Calibration: 15 turn span and zero
adjustment potentiometers.
ACCESSORIES
Model Description
A-GSTA-SE
GCK-200CO-2000CO2
A-507
3-45/64 [94.06]
3-1/8 [107.95]
2
(700 m2) or 50
Security enclosure
Calibration gas
Calibration adapter
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4-17/32
[115.09]
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[129.78]
Housing: UV resistant glass lled
polycarbonate.
Analog Output: Jumper selectable 4-20
mA (loop powered) or 2-10 V (max. load
2K Ω).
Enclosure Rating: IP64.
Weight: 1 lb (0.45 kg).
Switch Type: Single-pole double-throw
(SPDT).
Electrical Rating: 30 VAC/VDC. N/O =
5 A. N/C = 3 A.
Set Point: Jumper selectable 25, 60, or
150 PPM.
Set Point Differential/Hysteresis: 3%
of scale.
Relay Action: Factory set for direct
acting.
Agency Approvals: Sensor is UL
recognized component for ANSI/UL2034, UL-2075, E340403, CE.
YEAR LIMITED
WARRANTY
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