Dwyer Instruments CDTR-2N404 | Carbon Dioxide/Humidity | Wall Mount | Universal current/voltage output | North American Housing
The Dwyer CDTR-2N404 is a wall-mount carbon dioxide and relative humidity transmitter with a 0-2000 PPM CO₂ range, 0-100% RH measurement, and universal analog outputs. This model has no temperature output and uses a North American wall-mount housing.
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Part Number: CDTR-2N404
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Product Overview
The Dwyer CDTR-2N404 is part of the Series CDTR Carbon Dioxide, Relative Humidity and Temperature transmitter family, designed to combine indoor-air monitoring functions in a compact wall-mounted device.
This particular configuration provides CO₂ and relative humidity measurement while having no temperature output. It measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, making it suitable for building management and demand-controlled ventilation applications.
The transmitter uses a single-beam dual-wavelength NDIR sensor for CO₂ measurement and includes digital barometric pressure adjustment and field calibration capabilities. The sensor automatically corrects CO₂ measurement for light-source aging.
Dwyer's Digital Intelligence Temperature Compensation Algorithm (DITCA™) helps eliminate measurement error associated with self-heating in wall-mounted combination devices.
Universal outputs for CO₂ and relative humidity can be configured as 4-20 mA, 0-5 VDC, or 0-10 VDC, allowing integration with a wide range of building management controllers. The humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect configuration settings.
Because this model does not include an integral LCD, a service display tool is available for setup and calibration.
Key Benefits
- Combined CO₂ and relative humidity measurement in one wall-mounted device
- 0-2000 PPM CO₂ measurement range
- 0-100% RH measurement range
- No temperature output on this configuration
- Single-beam dual-wavelength NDIR CO₂ sensor
- Digital barometric pressure adjustment and field calibration
- DITCA™ temperature compensation
- Universal 4-20 mA, 0-5 VDC, and 0-10 VDC outputs for CO₂ and RH
- Replaceable humidity and temperature sensors
- Physical hardware lockout
- Compact North American wall-mount housing
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2N404 is suited for HVAC engineers, building automation professionals, facility managers, and indoor-air monitoring applications requiring CO₂ and relative humidity measurement from a single wall-mounted transmitter.
Typical applications include:
- Demand-controlled ventilation in schools, offices, hospitals, and other indoor spaces
- Building management systems requiring CO₂ and humidity monitoring
- Projects requiring combined CO₂ and RH measurement
- Ventilation monitoring applications
- LEED-related indoor-air and ventilation monitoring projects
How to Specify & Commission It
- Mount the CDTR-2N404 according to the installation requirements for its North American wall-mount housing.
- Connect the required 16-35 VDC or 19-28 VAC power supply.
- Select the required 4-20 mA, 0-5 VDC, or 0-10 VDC output configuration.
- Connect the CO₂ and RH outputs to the building management or control system.
- Set the barometric pressure adjustment as required for the installation.
- Perform field calibration when required.
- Verify the CO₂ and RH readings at the connected controller.
- For buildings occupied 24 hours a day, verify calibration every 6 to 12 months, depending on the application.
Frequently Asked Questions
What does the Dwyer CDTR-2N404 measure?
The CDTR-2N404 measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH. This configuration has no temperature output.
What sensor does the CDTR-2N404 use?
It uses a single-beam, dual-wavelength NDIR sensor for CO₂ measurement. The humidity and temperature sensors are replaceable.
What outputs are available?
Universal outputs are available for CO₂ and RH, including 4-20 mA, 0-5 VDC, and 0-10 VDC.
How accurate is the CDTR-2N404?
The specified CO₂ accuracy is ±40 ppm + 3% of reading, while relative humidity accuracy is ±2%.
Does the CDTR-2N404 have a temperature output?
No. The CDTR-2N404 has no temperature output. The model's temperature-sensor provision is used as part of the transmitter's internal compensation architecture rather than providing a user temperature output.
Does the CDTR-2N404 have a display?
No. It does not include an integral LCD. A service display tool is available for setup and calibration.
Does the CDTR-2N404 require recalibration?
For buildings occupied 24 hours a day, Dwyer recommends verifying calibration every 6 to 12 months, depending on the application.
What is the power requirement?
The transmitter operates from 16-35 VDC or 19-28 VAC. Average power consumption is approximately 2 W, with a peak of 3.75 W.
What is the enclosure rating?
The CDTR-2N404 has an IP20 enclosure rating.
Is genuine Dwyer stock available with UAE shipping?
Yes. General Tech Services LLC offers genuine Dwyer Instruments stock with free UAE-wide shipping. Call +971 6 5436933 for pricing and current availability.
Request a Quote Today
For pricing, availability, or assistance specifying the Dwyer CDTR-2N404 CO₂/RH transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
