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MODEL CMS300 | CARBON MONOXIDE TRANSMITTER AND SWITCH
®
BENEFITS/FEATURES
• 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
DESCRIPTIONAPPLICATIONS
• Garage or loading dock ventilation
• Vehicle maintenance facilities
• Mechanical room monitoring
SPECIFICATIONS
Service Electrochemical, 5 years typical lifespan.
Range 0 to 300 PPM.
Output Drift <5% per year in air.
Temperature Effect ± 2% over range.
Coverage Area 7,500 ft
Accuracy ± 5 PPM or 5% of reading for 0 to 300 PPM (whichever is greater).
Resolution 1 PPM.
Power Requirement 12-40 VDC or 15-32 VAC @ 160 mA max.
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 to 90% RH constant; 0 to 99% RH intermittent.
Response Time <45 s to 90% of nal value.
Calibration 15 turn span and zero adjustment potentiometers.
Housing UV resistant glass lled polycarbonate.
Analog Output Jumper selectable 4-20 mA (loop powered) or 2-10 V (maximum load 2k Ω).
Enclosure Rating IP64.
Weight 1 lb. (0.45 kg).
Switch Type Single-pole double-throw (SPDT).
Relay Electrical Rating 30 VDC, 250 VAC. N/O=5 A. N/C=3 A resistive.
Set Point Jumper selectable 25, 60, or 150 PPM.
Set Point Differential/ Hysteresis 3% of scale.
Relay Action Factory set for direct acting.
Compliance Sensor is UL recognized component for ANSI/UL-2034, UL-2075, E340403, CE.
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(700 m2) or 50 ft (15 m) radius.
The 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 garage, vehicle
maintenance facilities, or mechanical ooms. 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.
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DIMENSIONS WIRING DIAGRAM
COM
1 2 3 4
+-
4-17/32
15.09]
4X Ø13/64 [5.16]
3-45/64 [94.06]
3-1/8 [79.38]
4-17/32
[115.09]
[129.78]
5-7/64
2-15/64
[56.75]
MOUNTING HOLES
3-1/8 [79.38]
[1
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
MODEL
CMS300: Carbon monoxide transmitter and switch
CMS300
POWER
SUPPLY
P1
+-
RELAY WIRING
1 2 3
P2
N/O N/C
RECEIVER
ACCESSORIES
Model Description
A-GSTA-SE
GCK-200CO-2000CO2
A-507
©Copyright 2022 Dwyer Instruments, LLC
Printed in U.S.A. 2/22 DS-CMS300 Rev. 5
Important Notice: Dwyer Instruments, LLC reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the
latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
Security enclosure
Calibration gas
Calibration adapter
DWYER INSTRUMENTS, LLC
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