Dwyer Instruments CDT-2N4D | Carbon Dioxide/Temperature | Wall Mount | Universal current/voltage output | Pt100 RTD Temperature Output | North American Housing
The Dwyer CDT-2N4D is a wall-mount carbon dioxide and temperature transmitter designed for indoor environmental monitoring. It measures CO₂ from 0 to 2000 PPM and provides a Pt100 Ω RTD temperature output, with a universal CO₂ output selectable between 4–20 mA, 0–5 VDC, and 0–10 VDC.
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Part Number: CDT-2N4D
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Product Overview
The Dwyer CDT-2N4D combines CO₂ and temperature measurement in a single wall-mounted transmitter, helping HVAC and building automation systems monitor indoor conditions while reducing the number of devices required in the space.
The transmitter measures CO₂ concentrations from 0 to 2000 PPM and provides temperature measurement through a Pt100 Ω RTD output across 32 to 122°F (0 to 50°C). Its universal CO₂ output can be configured for 4–20 mA, 0–5 VDC, or 0–10 VDC, allowing integration with a variety of building automation and HVAC control systems.
A single-beam, dual-wavelength NDIR sensor provides CO₂ measurement with a stated 15-year life expectancy. The sensor automatically corrects measurement against light-source aging effects in occupied and unoccupied buildings. Digital barometric pressure adjustment and field calibration capability further support accurate operation.
The CDT-2N4D features a North American wall-mount housing with an IP20 enclosure rating. Push buttons provide access to the transmitter's menu structure, while an internal DIP switch can lock the controls to help prevent unwanted changes. The backplate electrical connection simplifies installation.
Combining CO₂ and temperature measurement in one transmitter can help minimize inventory requirements and reduce the number of devices installed in the monitored space.
For applications requiring local visual indication, the CDT-2N4D-LCD provides the same transmitter configuration with an integral LCD display.
Key Benefits
- Measures CO₂ from 0 to 2000 PPM
- Combines CO₂ and temperature measurement in one wall-mount transmitter
- Pt100 Ω RTD temperature output
- Universal CO₂ output: 4–20 mA, 0–5 VDC, or 0–10 VDC
- Single-beam, dual-wavelength NDIR CO₂ sensor
- 15-year sensor light-source life expectancy
- Digital barometric pressure adjustment and field calibration capability
- Lockable push-button menu access
- North American wall-mount housing
- Backplate electrical connection
- IP20 enclosure rating
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDT-2N4D is suitable for:
- Demand-controlled ventilation in schools, offices, and hospitals
- HVAC and building automation systems requiring CO₂ monitoring
- Projects requiring CO₂ and temperature measurement from one wall-mounted device
- LEED-driven ventilation monitoring
- Building operators monitoring indoor environmental conditions
- Control systems requiring a selectable 4–20 mA, 0–5 VDC, or 0–10 VDC CO₂ signal
How to Specify & Commission It
- Mount the CDT-2N4D wall housing and use the backplate electrical connection.
- Connect the required power supply of 16–35 VDC or 19–28 VAC.
- Select the required CO₂ output: 4–20 mA, 0–5 VDC, or 0–10 VDC.
- Set the barometric pressure and perform field calibration if required.
- Verify the CO₂ and temperature readings at the connected controller.
- Lock the push-button menu through the internal DIP switch when access protection is required.
Frequently Asked Questions
What does the Dwyer CDT-2N4D measure?
The CDT-2N4D measures CO₂ from 0 to 2000 PPM and temperature using a Pt100 Ω RTD temperature output.
What CO₂ outputs are available?
The transmitter provides a universal CO₂ output selectable as 4–20 mA, 0–5 VDC, or 0–10 VDC.
What is the temperature range?
The temperature measurement range is 32 to 122°F (0 to 50°C).
How accurate is the CDT-2N4D?
CO₂ accuracy is ±40 ppm + 3% of reading, while temperature accuracy is ±1°C at 25°C.
What sensor technology is used?
The CDT-2N4D uses a single-beam, dual-wavelength NDIR sensor with a stated 15-year life expectancy. It also provides digital barometric pressure adjustment and field calibration capability.
Does the CDT-2N4D have an integral display?
No. The CDT-2N4D does not have an integral LCD display. The CDT-2N4D-LCD is the corresponding configuration with an integral LCD.
Does the CDT-2N4D have a relay output?
No. The CDT-2N4D does not include a relay output.
What power supply does the CDT-2N4D require?
It operates from 16–35 VDC or 19–28 VAC with an average power consumption of 2 W.
Where can the CDT-2N4D be used?
It is suitable for indoor applications including demand-controlled ventilation, schools, offices, hospitals, and LEED-driven ventilation monitoring.
Is genuine Dwyer stock available with UAE shipping?
Yes. General Tech Services LLC supplies genuine Dwyer Instruments products with free UAE-wide shipping. Call +971 6 5436933 for pricing and current availability.
Request a Quote Today
For pricing, availability, or technical assistance with the Dwyer CDT-2N4D CO₂/temperature transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
