Dwyer CMS300 : Wall Mount Carbon Monoxide Transmitter and Switch, 300 PPM Range, Selectable 4 to 20 mA or 2 to 10 VDC Output, Integral SPDT Relay Contact for Low or High Alarm, 5-Year Warranty
The Model CMS300 Carbon Monoxide Transmitter and Switch delivers precise monitoring of carbon monoxide levels in underground parking garages, vehicle maintenance facilities, and mechanical rooms. It offers a field-selectable current or voltage output proportional to CO concentration. An integrated SPDT relay, configured with jumper-selectable preset alarm thresholds at 25, 60, or 150 PPM, enhances safety and automation. Field calibration is facilitated using the Model GCK-200CO-2000CO2 calibration gas, Model A-507 calibration adapter, and onboard zero and span adjustment potentiometers.
Applications
- Garage and loading dock ventilation
- Vehicle maintenance facility monitoring
- Mechanical room air quality management
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 ft2 (700 m2) or 50 ft (15 m) radius. |
| 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 Limits: | -4 to 122°F (-20 to 50°C). |
| Storage Temperature: | For best sensor life, 32°F to 68°F (0 to 20°C). |
| Humidity Limits: | 15 to 90% RH constant; 0 to 99% RH intermittent. |
| Response Time: | <45 s to 90% of final value. |
| Calibration: | 15 turn span and zero adjustment potentiometers. |
| Housing: | UV resistant glass filled polycarbonate. |
| Analog Outputs: | 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. |
Datasheets
 |
Dwyer CMS300 Series | Carbon Monoxide Data Sheet |
|
Dwyer CMS300 Series | Carbon Monoxide Catalog Page |
- Enclosure Style:
- Wall
- Gas Element:
- Carbon Monoxide
- Analog Output:
- 1
- Relay Output:
- 1 SPDT
- Communication:
- None
- Display:
- No Display
