Dwyer Instruments CDTR-2D4D4 | Carbon Dioxide/RH/Temperature Transmitter | 2000 ppm CO2 range | Duct mount | 4 to 20 mA/0 to (5 or 10) VDC CO2 output | RH outputs & Pt100 O RTD temperature output
The Dwyer Instruments CDTR-2E404 is a wall-mounted carbon dioxide and relative humidity transmitter with a European housing. It measures CO₂ from 0-2000 PPM and relative humidity from 0-100% RH, with universal 4-20 mA, 0-5 VDC or 0-10 VDC outputs for integration with building management and HVAC control systems.
This model has no temperature output, making it suitable for applications where CO₂ and humidity monitoring are required without a separate temperature signal.
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Part Number: CDTR-2E404
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Product Overview
The Dwyer CDTR-2E404 is part of the Series CDTR Carbon Dioxide, Relative Humidity and Temperature transmitter family. It combines CO₂ and relative humidity measurement in a compact European wall-mount housing, reducing the need for separate sensors in indoor air quality and ventilation applications.
The transmitter provides a 0-2000 PPM CO₂ measurement range and 0-100% RH measurement range. Although the CDTR family supports temperature measurement on selected models, the CDTR-2E404 has no temperature output.
A single-beam dual-wavelength NDIR sensor measures CO₂ and automatically corrects the measurement for light-source aging. The transmitter also provides digital barometric pressure adjustment and field calibration to support accurate CO₂ monitoring.
Dwyer's Digital Intelligence Temperature Compensation Algorithm (DITCA™) is designed to compensate for measurement errors associated with self-heating in wall-mounted combination devices.
The CDTR-2E404 provides universal analog outputs for CO₂ and relative humidity. The outputs can be configured as 4-20 mA, 0-5 VDC or 0-10 VDC, allowing connection to a wide range of building management controllers. The current output supports a maximum 500 Ω load, while voltage outputs require a minimum 500 Ω load.
The humidity sensor is replaceable, and a physical hardware lockout helps protect configuration settings. Since the CDTR-2E404 does not include an integral LCD, a service display tool is available for setup and calibration.
The transmitter operates from 16-35 VDC or 19-28 VAC, with average power consumption of 2 W and peak consumption of 3.75 W. It is designed for 32 to 122°F (0 to 50°C) operating conditions and 10-95% RH, non-condensing humidity conditions.
Key Benefits
- Combined CO₂ and relative humidity measurement in one device
- 0-2000 PPM CO₂ range
- 0-100% RH measurement range
- European wall-mount housing
- Single-beam dual-wavelength NDIR CO₂ sensor
- Automatic CO₂ correction for light-source aging
- Digital barometric pressure adjustment
- Field calibration capability
- DITCA™ temperature compensation
- Universal 4-20 mA, 0-5 VDC and 0-10 VDC outputs
- Replaceable humidity sensor
- Physical hardware lockout
- Compact wall-mount enclosure
- No temperature output for applications requiring only CO₂ and RH
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2E404 is suited for HVAC engineers, facility managers, building automation professionals and system integrators who need CO₂ and relative humidity monitoring from a single wall-mounted transmitter without a temperature output.
Typical applications include:
- Demand-controlled ventilation in schools and offices
- Indoor air quality monitoring
- Hospitals and commercial buildings
- Building management and HVAC control systems
- Projects requiring combined CO₂ and humidity monitoring
- Ventilation monitoring and energy-efficiency projects
- Applications where temperature measurement is handled separately
How to Specify & Commission It
- Install the CDTR-2E404 European wall-mount transmitter according to the manufacturer's installation requirements.
- Connect the appropriate 16-35 VDC or 19-28 VAC power supply.
- Select the required 4-20 mA, 0-5 VDC or 0-10 VDC output configuration.
- Set the appropriate barometric pressure value.
- Perform field calibration if required using the service display tool.
- Connect the CO₂ and RH outputs to the building management or HVAC controller.
- Verify the readings before commissioning the ventilation or control system.
Frequently Asked Questions
What does the Dwyer CDTR-2E404 measure?
The CDTR-2E404 measures CO₂ from 0-2000 PPM and relative humidity from 0-100% RH. This model has no temperature output.
What type of CO₂ sensor does it use?
It uses a single-beam dual-wavelength NDIR sensor with automatic correction for light-source aging.
What outputs are available?
The transmitter provides universal 4-20 mA, 0-5 VDC or 0-10 VDC outputs for CO₂ and RH.
How accurate is the CDTR-2E404?
CO₂ accuracy is ±40 ppm + 3% of reading, while relative humidity accuracy is ±2%.
Does the CDTR-2E404 provide temperature measurement?
No. The CDTR-2E404 has no temperature output. Other CDTR variants are available with different temperature sensor configurations.
Does the CDTR-2E404 have a display?
No. It has no integral LCD. A service display tool is available for setup and calibration.
Does it require recalibration?
For buildings occupied 24 hours a day, Dwyer recommends verifying calibration every 6 to 12 months, depending on the application.
What power supply does the CDTR-2E404 require?
It operates from 16-35 VDC or 19-28 VAC. Average power consumption is 2 W, with peak consumption of 3.75 W.
What is the enclosure rating?
The CDTR-2E404 has an IP20 enclosure rating.
Is genuine stock available with UAE shipping?
Yes. Genuine Dwyer Instruments stock is available through General Tech Services LLC with free UAE-wide shipping. Call +971 6 5436933 for pricing and current availability.
Request a Quote Today
For pricing, availability or technical assistance for the Dwyer CDTR-2E404 CO₂/RH transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
