Model CMS300 Carbon Monoxide Transmitter and Switch

Current/Voltage Selectable Output, Jumper Selectable SPDT Relay Contact

The Model CMS300 Carbon Monoxide Transmitter and Switch provides a field 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 configured 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.

Product Applications

  • Garage or loading dock ventilation
  • Vehicle maintenance facilities
  • Mechanical room monitoring

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Same Day
Price: $187.00
Carbon monoxide transmitter & switch, 0-300 PPM, 4-20 mA/2-10 V (maximum load 2K Ω) Same Day* $187.00 Order
Ships: 2-3 Weeks
Price: $223.50
Carbon monoxide transmitter & switch, 0-300 PPM, 4-20 mA/2-10 V (maximum load 2K Ω), includes factory calibration certificate 2-3 Weeks* $223.50 Order


Electrochemical, 5 years typical lifespan.
0-300 PPM.
Output Drift:
<5% per year in air.
Temperature Effect:
±2% over range.
Coverage Area:
7,500 ft² (700 m²) or 50 ft (15 m) radius.
±5 PPM or 5% of reading for 0-300 PPM (whichever is greater).
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 seconds to 90% of final value
15 turn span and zero adjustment potentiometers.
UV resistant glass filledpolycarbonate.
Analog Output:
Jumper selectable 4 to 20 mA (loop powered) or 2 to 10 V (maximum load 2 kΩ).
Enclosure Rating:
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.
Agency Approvals:
Sensor is UL recognized component for ANSI/UL-2034, UL-2075, E340403, CE.


  • 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


Model Number Description Usually Ships* Price Order
Gas Calibration Kit <br><b>(GROUND SHIPMENTS ONLY)</b> GCK-200CO-2000CO2 Gas Calibration Kit
Call for Details $688.00 Order
Gas calibration kit adaptor. A-507 Gas calibration kit adaptor. 2-3 Weeks $77.00 Order
Security enclosure. A-GSTA-SE Security enclosure. Same Day $17.25 Order


Product Literature


Catalog Pages

Product Data Sheet




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