Dwyer Instruments CDT-2N4F | Carbon Dioxide/Temperature | Wall Mount | Universal current/voltage output | 20K Thermistor Temperature Output | North American Housing
The Dwyer CDT-2N4F is a wall-mount carbon dioxide and temperature transmitter designed for indoor air-quality monitoring and demand-controlled ventilation applications. It measures 0–2000 PPM CO₂ and provides temperature measurement through a 20 kΩ thermistor.
The transmitter features a universal CO₂ output selectable between 4–20 mA, 0–5 VDC and 0–10 VDC, providing flexible integration with HVAC and building automation controllers.
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Part No.: CDT-2N4F
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Product Overview
The Dwyer CDT-2N4F is part of Dwyer's Series CDT carbon dioxide and temperature transmitter range. It combines CO₂ and temperature measurement in a single compact North American wall-mount housing, helping reduce the number of separate devices required in an indoor space.
The transmitter measures CO₂ across a 0–2000 PPM range and provides temperature measurement using a 20 kΩ thermistor. The specified temperature range is 32 to 122°F (0 to 50°C).
A single-beam, dual-wavelength NDIR CO₂ sensor provides the CO₂ measurement and has a 15-year life expectancy. The sensor automatically corrects the measurement for light-source aging effects in both occupied and unoccupied buildings.
The CDT-2N4F provides digital barometric pressure adjustment and allows the sensor to be field calibrated, supporting configuration for the installation environment.
For controller integration, the CO₂ output is universally selectable as 4–20 mA, 0–5 VDC or 0–10 VDC. Push buttons on the unit provide access to the menu structure, while an internal DIP switch can lock out the menu to help prevent unauthorized changes or tampering.
The backplate electrical connection simplifies installation. Combining CO₂ and temperature measurement in one transmitter also helps minimize inventory and reduce the number of devices installed in the monitored space.
The transmitter operates from 16–35 VDC or 19–28 VAC, with average power consumption of 2 W. The wall-mount enclosure has an IP20 rating. This model has no integral LCD display and no relay output.
For applications requiring local display indication, the CDT-2N4F-LCD provides the corresponding configuration with an integral LCD display.
Key Benefits
- Measures CO₂ and temperature in one wall-mounted transmitter
- 0–2000 PPM CO₂ measurement range
- 20 kΩ thermistor temperature output
- Single-beam, dual-wavelength NDIR CO₂ sensor
- Sensor has a 15-year life expectancy
- Universal CO₂ output: 4–20 mA, 0–5 VDC or 0–10 VDC
- Digital barometric pressure adjustment
- Field calibration capability
- Lockable push-button menu access
- Backplate electrical connection for simplified installation
- No integral LCD or relay output
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDT-2N4F is suited for HVAC, building automation and indoor-air-quality applications where CO₂ and temperature need to be monitored from a single wall-mounted transmitter.
Typical applications include:
- Demand-controlled ventilation in schools, offices and hospitals
- HVAC control and building automation systems
- Indoor-air-quality monitoring
- Projects requiring CO₂ and temperature from one wall device
- LEED-driven ventilation monitoring
- Commercial buildings requiring flexible analog output compatibility
How to Specify & Commission It
- Mount the North American wall housing in the required indoor location and use the backplate electrical connection.
- Connect the power supply and select the required CO₂ output: 4–20 mA, 0–5 VDC or 0–10 VDC.
- Configure the barometric pressure setting and perform field calibration if required for the application.
- Configure the menu settings as required and lock the menu using the internal DIP switch if necessary.
- Verify the CO₂ and temperature readings at the connected HVAC or building automation controller.
Frequently Asked Questions
What does the Dwyer CDT-2N4F measure?
The transmitter measures CO₂ from 0–2000 PPM and temperature using a 20 kΩ thermistor.
What CO₂ outputs are available?
The CDT-2N4F provides a universal CO₂ output selectable between 4–20 mA, 0–5 VDC and 0–10 VDC.
How accurate is the CDT-2N4F?
CO₂ accuracy is ±40 ppm + 3% of reading, while temperature accuracy is ±1°C at 25°C.
What CO₂ sensor technology does it use?
It uses a single-beam, dual-wavelength NDIR sensor with a 15-year life expectancy.
Can the CDT-2N4F be calibrated in the field?
Yes. The transmitter provides digital barometric pressure adjustment and field-calibration capability.
Does the CDT-2N4F have a display or relay?
No. The CDT-2N4F has no integral LCD display and no relay output. The CDT-2N4F-LCD is the corresponding version with an integral LCD.
What is the difference between the CDT-2N4F and CDT-2N4F-LCD?
The CDT-2N4F-LCD includes an integral LCD display, while the CDT-2N4F does not have a display. Both configurations provide CO₂ and temperature measurement with the same 20 kΩ thermistor configuration.
Is genuine stock available with UAE shipping?
Yes. Genuine Dwyer Instruments stock with free UAE-wide shipping is available. Call +971 6 5436933 for pricing and current availability.
Request a Quote Today
For pricing, availability or technical assistance for the Dwyer CDT-2N4F CO₂/Temperature Transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
