


Dwyer Instruments CMS300-FC | Carbon monoxide transmitter & switch | 0-300 PPM | 4-20 mA/2-10 V (maximum load 2K Ω) | Includes factory calibration certificate
A field-selectable current or voltage output that is proportionate to the carbon monoxide concentration in underground parking garages, car repair shops, or mechanical rooms is offered by the Model CMS300-FC Carbon Monoxide Transmitter and Switch. An inbuilt relay with preset jumper selectable ranges of 25, 60, or 150 PPM can be used for alert conditions. The on board zero and span potentiometers, the Model A-507 calibration adapter, and the Model GCK-200CO-2000CO2 calibration gas can all be used for field calibration.

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- Specifications
- Features
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Accuracy | +/-5 PPM or 5% of reading for 0-300 PPM (whichever is greater) |
Approvals | Sensor is UL recognized component for ANSI/UL-2034, UL-2075, E340403, CE |
Coverage Area | 7,500 ft2 (700 m2) or 50 ft (15 m) radius |
Enclosure Rating | IP64 |
Housing | UV resistant glass filledpolycarbonate |
Humidity | Range: 15-90% RH constant; 0-99% RH intermittent |
Output | Analog: Jumper selectable 4 to 20 mA (loop powered) or 2 to 10 V (maximum load 2 k¢ž¦) |
Output | Drift: <5% per year in air |
Range | 0-300 PPM |
Rating | Electrical: 30 VAC/VDC. N/O = 5 A; N/C = 3 A |
Relay | Action: Factory set for direct acting |
Resolution | 1 PPM |
Response Time | <45 seconds to 90% of final value |
Sensor Type | Electrochemical, 5 years typical lifespan |
Set Point | Differential/Hysteresis: 3% of scale |
Set Point | Jumper selectable 25, 60, or 150 PPM |
Storage Temperature | For best sensor life, 32°F to 68°F (0 to 20°C) |
Temperature Effect | +/-2% over range |
Temperature Range | -4 to 122°F (-20 to 50°C) |
Type | Switch: Single-pole double-throw (SPDT) |
Weight | 1 lb (0.45 kg) |
- Analog outputs with field selectable voltage or current.
- SPDT relay contact included for either a low or high alert.
- Alarm set points of 25, 60, or 150 PPM can be selected via a jumper.
- Carbon monoxide sensor element approved by UL.
- Kits for field calibration.
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