Dwyer Instruments CDT-2N4F-LCD | Carbon Dioxide/Temperature | Wall Mount | Universal current/voltage output | 20K Thermistor Temperature Output | North American Housing | LCD Display
The Dwyer CDT-2N4F-LCD 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, with an integral LCD display for local indication.
The transmitter supports a universal CO₂ output selectable between 4–20 mA, 0–5 VDC and 0–10 VDC, making it suitable for integration with a wide range of HVAC and building automation controllers.
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Part No.: CDT-2N4F-LCD
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Product Overview
The Dwyer CDT-2N4F-LCD 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-LCD provides digital barometric pressure adjustment and allows the sensor to be field calibrated, supporting accurate 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 be used to lock out the menu and help prevent unauthorized changes.
The integral LCD display provides local indication of CO₂ and temperature measurements, allowing users to view key readings directly at the transmitter without relying exclusively on the connected controller.
The backplate electrical connection simplifies installation, while combining CO₂ and temperature measurement in one transmitter helps reduce inventory and the number of devices mounted within the monitored space.
The transmitter operates from 16–35 VDC or 19–28 VAC, with average power consumption of 2 W. Its wall-mount enclosure has an IP20 rating and does not include a relay output.
For applications that do not require the LCD, the CDT-2N4F provides the corresponding configuration without the integral 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
- Integral LCD display for local CO₂ and temperature indication
- Digital barometric pressure adjustment
- Field calibration capability
- Push-button menu access with internal DIP-switch lockout
- Backplate electrical connection for simplified installation
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDT-2N4F-LCD is suited for HVAC, building automation and indoor-air-quality applications where CO₂ and temperature need to be monitored from a single wall-mounted device with local display capability.
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
- Applications requiring local CO₂ and temperature indication
- LEED-driven ventilation monitoring
- Commercial buildings requiring universal 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 use the internal DIP switch to lock the menu if required.
- Verify the CO₂ and temperature readings both on the integral LCD and at the connected controller.
Frequently Asked Questions
What does the Dwyer CDT-2N4F-LCD measure?
The transmitter measures CO₂ from 0–2000 PPM and temperature using a 20 kΩ thermistor.
What CO₂ outputs are available?
The CDT-2N4F-LCD provides a universal CO₂ output selectable between 4–20 mA, 0–5 VDC and 0–10 VDC.
Does the CDT-2N4F-LCD have an LCD display?
Yes. The CDT-2N4F-LCD includes an integral LCD display for local indication of CO₂ and temperature.
Does the CDT-2N4F-LCD have a relay?
No. This model does not include a relay output.
How accurate is the CDT-2N4F-LCD?
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-LCD be calibrated in the field?
Yes. The transmitter provides digital barometric pressure adjustment and field-calibration capability.
What is the difference between the CDT-2N4F-LCD and CDT-2N4F?
The CDT-2N4F-LCD includes an integral LCD display, while the CDT-2N4F is the corresponding configuration without the integral LCD.
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-LCD CO₂/Temperature Transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
