Dwyer Instruments CDTR-2N4D4 | Carbon Dioxide/Temperature/Humidity | Wall Mount | Universal current/voltage output | Pt100 O RTD Temperature Output | North American Housing
The Dwyer CDTR-2N4D4 is a wall-mount CO₂/RH/temperature transmitter with a 0-2000 PPM CO₂ range, 0-100% relative humidity measurement, and a Pt100 Ω RTD temperature output. It provides universal 4-20 mA, 0-5 VDC, or 0-10 VDC outputs for CO₂ and RH and uses a North American wall-mount housing.
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Part Number: CDTR-2N4D4
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Product Overview
The Dwyer CDTR-2N4D4 combines carbon dioxide, relative humidity, and temperature measurement in a single compact wall-mounted transmitter. By combining three measurements in one device, it can reduce the number of individual sensors required in building and HVAC applications.
The transmitter measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, with a Pt100 Ω RTD temperature output. Its North American housing is designed for wall-mounted indoor applications.
A single-beam, dual-wavelength NDIR sensor measures carbon dioxide and automatically corrects the CO₂ measurement for light-source aging. The transmitter also provides digital barometric pressure adjustment and field calibration capabilities for commissioning and maintenance.
Dwyer's Digital Intelligence Temperature Compensation Algorithm (DITCA™) is designed to eliminate measurement error associated with self-heating in wall-mounted combination devices.
Universal outputs for CO₂ and relative humidity can be selected as 4-20 mA, 0-5 VDC, or 0-10 VDC, allowing the transmitter to interface with a wide range of building management controllers. The current output supports a maximum load of 500 Ω, while the voltage outputs require a minimum load of 500 Ω.
The humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect the transmitter's settings. Because the CDTR-2N4D4 has no 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 operates from 32 to 122°F (0 to 50°C) and is designed for environments with 10-95% RH, non-condensing.
Need a different configuration? The CDTR-2N4D4-LCD is the same transmitter with an integral LCD display.
Key Benefits
- Combines CO₂, relative humidity, and temperature measurement in one device
- 0-2000 PPM CO₂ measurement range
- 0-100% RH measurement range
- Pt100 Ω RTD temperature output
- Single-beam dual-wavelength NDIR CO₂ sensor
- Digital barometric pressure adjustment and field calibration
- DITCA™ temperature compensation for wall-mounted combination devices
- Universal 4-20 mA, 0-5 VDC, or 0-10 VDC outputs for CO₂ and RH
- Replaceable humidity and temperature sensors
- Physical hardware lockout for configuration protection
- No integral LCD; service display tool available for setup and calibration
- Compact North American wall-mount housing
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2N4D4 is suitable for HVAC, building automation, and indoor environmental monitoring applications where CO₂, humidity, and temperature need to be measured from a single wall-mounted transmitter.
Typical applications include:
- Demand-controlled ventilation in schools, offices, hospitals, and other indoor spaces
- Building management system monitoring
- Projects requiring CO₂, humidity, and temperature measurement from one device
- Indoor air quality monitoring
- Ventilation monitoring for energy-efficiency and LEED-related projects
How to Specify & Commission It
- Mount the CDTR-2N4D4 on the wall according to the installation instructions.
- Connect the required power supply using 16-35 VDC or 19-28 VAC.
- Select and wire the required 4-20 mA, 0-5 VDC, or 0-10 VDC outputs for CO₂ and RH.
- Set the appropriate barometric pressure value and perform field calibration if required.
- Use the service display tool when setup or calibration access is required.
- Verify CO₂, RH, and temperature readings at the connected controller before commissioning.
Frequently Asked Questions
What does the Dwyer CDTR-2N4D4 measure?
It measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, with a Pt100 Ω RTD temperature output.
What outputs are available?
The transmitter provides universal 4-20 mA, 0-5 VDC, or 0-10 VDC outputs for CO₂ and relative humidity.
How accurate is the CDTR-2N4D4?
CO₂ accuracy is ±40 ppm + 3% of reading, while relative humidity accuracy is ±2%.
What type of CO₂ sensor does the CDTR-2N4D4 use?
It uses a single-beam, dual-wavelength NDIR sensor with automatic correction for light-source aging.
Does the CDTR-2N4D4 have a display?
No. The CDTR-2N4D4 does not have an integral LCD. A service display tool is available for setup and calibration.
Does it support field calibration?
Yes. The transmitter provides field calibration and digital barometric pressure adjustment.
What is DITCA™?
DITCA™, or Digital Intelligence Temperature Compensation Algorithm, is designed to eliminate measurement error caused by self-heating in wall-mounted combination devices.
How often should the transmitter be verified?
For buildings occupied 24 hours a day, Dwyer recommends verifying calibration every 6 to 12 months, depending on the application.
Is there a version with an LCD display?
Yes. The Dwyer CDTR-2N4D4-LCD provides the same general transmitter configuration with an integral LCD display.
Is genuine Dwyer stock available with UAE shipping?
Yes. Genuine Dwyer Instruments stock with free UAE-wide shipping is available. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing, availability, or technical assistance for the Dwyer CDTR-2N4D4 CO₂/RH/temperature transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
