


Dwyer Instruments CDT-2E40 | Carbon Dioxide | Wall Mount | Universal current/voltage output | European Housing
The Series CDT, Model CDT-2E40 is a Carbon Dioxide and Temperature Transmitter that precisely measures the CO2 concentration and temperature in interior spaces, helping to save energy. The Series CDT incorporates barometric pressure adjustment to provide even higher precision. To interact with almost any building management controller, customers can choose the transmitter output to be 4-20 mA, 0-5 VDC, or 0-10 VDC using the CO2 universal output. The wall mount variants of the Series CDT can be supplied with an integrated LCD display for applications that need visual indication. An internal dip switch selection can be used to lock out button operation to avoid tampering. The -S option for the Series CDT CO2 transmitters offers the features and characteristics required to meet DSA regulations for CO2 level monitoring in schools. A front-facing LED becomes visible when the CO2 concentration rises above 1100 PPM.

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Accuracy | CO2: +/-40 PPM + 3% of reading (2000 PPM CO2) +/- 50 PPM + 5% of reading (5000 PPM CO2) RH: +/-2% (10 to 90% RH) (for units configured with humidity output) Temperature: +/-1°C @ 25°C |
Approvals | CE |
Humidity | Limits: 0 to 85% (non-condensing) |
Manufacturer | Dwyer Instruments |
Maximum operating temperature | 32 to 122°F (0 to 50°C) |
Output | Current: 4-20 mA (max. 500 ¢ž¦) Voltage: 0-5 VDC or 0-10 VDC (min. 500 ¢ž¦) Relay: SPST NO rated 2A @ 30 VDC RTD or thermistor per Resistance vs. Temperature Table (depending on model) |
POWER CONSUMPTION | Average: 2 w Peak: 3.75 w |
Power | 16-35 VDC or 19-28 VAC |
Range | CO2: 0 to 2000 or 0 to 5000 PPM (depending on model) Temperature: 32 to 122°F (0 to 50°C) |
Response Time | 2 min for 90% step change |
Type | Carbon Dioxide and Temperature Transmitters |
- By integrating temperature and CO2 readings into a single transmitter, you may reduce inventory and save time.
- Uses Automatic Baseline Correction (ABC) to correct for sensor drift and requires little maintenance.
- Use a CO2 sensor that is low energy, repeatable, and dependable to cut down on operating expenses.
- Using a backplate electrical connection will simplify installation.
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