Dwyer Instruments CDTR-2N4E4 | Carbon Dioxide/Temperature/Humidity | Wall Mount | Universal current/voltage output | Pt1000 O RTD Temperature Output | North American Housing
The Dwyer Instruments CDTR-2N4E4 is a wall-mounted carbon dioxide, relative humidity, and temperature transmitter designed to combine multiple environmental measurements in one compact device. It provides a 0-2000 PPM CO₂ range, 0-100% RH measurement, and a Pt1000 Ω RTD temperature output, with universal analog outputs for integration with HVAC and building management systems.
This model uses a North American wall-mount housing and does not include an integral LCD display. A service display tool is available for setup and calibration.
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Part Number: CDTR-2N4E4
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Product Overview
The Dwyer CDTR-2N4E4 is part of the Series CDTR Carbon Dioxide, Relative Humidity and Temperature Transmitters, designed to reduce the number of separate sensors required in wall or duct installations.
The transmitter measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, while temperature is measured through a Pt1000 Ω RTD output. Combining these measurements in one device makes the CDTR-2N4E4 suitable for HVAC monitoring, indoor environmental control, and demand-controlled ventilation applications.
For CO₂ measurement, the transmitter uses a single-beam dual-wavelength NDIR sensor that automatically corrects for light-source aging. The CDTR also provides digital barometric pressure adjustment and field calibration, helping users configure the device for installation conditions.
The Digital Intelligence Temperature Compensation Algorithm (DITCA™) is designed to eliminate errors caused by self-heating in wall-mounted combination devices, supporting reliable measurement performance.
Universal outputs for CO₂ and relative humidity can be configured as 4-20 mA, 0-5 VDC, or 0-10 VDC, allowing connection to a wide range of building management controllers and HVAC automation systems.
The humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect configuration settings. The CDTR-2N4E4 does not have an integral LCD, but a service display tool is available for setup and calibration.
For installations requiring a local display, the CDTR-2N4E4-LCD provides the corresponding configuration with an integral LCD.
Key Benefits
- Measures CO₂, relative humidity, and temperature in one device
- 0-2000 PPM CO₂ measurement range
- 0-100% RH measurement range
- Pt1000 Ω RTD temperature output
- Single-beam dual-wavelength NDIR sensor
- Digital barometric pressure adjustment
- Field-calibration capability
- 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
- Compact North American wall-mount enclosure
- No integral LCD; service display tool available for setup and calibration
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2N4E4 is suited for:
- Demand-controlled ventilation systems
- Schools, offices, hospitals, and other indoor spaces
- HVAC monitoring and control applications
- Building management system (BMS) projects
- LEED-driven ventilation monitoring
- Applications requiring CO₂, humidity, and temperature from one device
- Retrofit projects where multiple environmental sensors need to be consolidated
How to Specify & Commission It
- Mount the CDTR-2N4E4 on the wall according to the installation requirements for the North American housing.
- Connect the power supply and required output wiring.
- Select the appropriate 4-20 mA, 0-5 VDC, or 0-10 VDC output configuration for CO₂ and RH.
- Set the required barometric pressure value and perform field calibration if necessary.
- Use the service display tool for setup and calibration when required.
- Verify the CO₂, relative humidity, and temperature readings at the connected controller or BMS.
The transmitter operates from 16-35 VDC or 19-28 VAC and has an average power consumption of approximately 2 W, with peak consumption of 3.75 W.
Frequently Asked Questions
What does the Dwyer CDTR-2N4E4 measure?
The CDTR-2N4E4 measures CO₂ from 0-2000 PPM, relative humidity from 0-100% RH, and temperature through a Pt1000 Ω RTD output.
What sensor technology does it use?
It uses a single-beam dual-wavelength NDIR sensor that automatically corrects the CO₂ measurement for light-source aging.
What outputs are available?
Universal 4-20 mA, 0-5 VDC, or 0-10 VDC outputs are available for CO₂ and relative humidity.
What temperature output does the CDTR-2N4E4 provide?
The transmitter provides a Pt1000 Ω RTD temperature output.
Does the CDTR-2N4E4 have an LCD display?
No. The CDTR-2N4E4 has no integral LCD display. A service display tool is available for setup and calibration.
Can the humidity and temperature sensors be replaced?
Yes. The humidity and temperature sensors are replaceable.
How accurate is the CDTR-2N4E4?
The stated accuracy is ±40 PPM + 3% of reading for CO₂ and ±2% for relative humidity.
Does the transmitter 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 difference between the CDTR-2N4E4 and CDTR-2N4E4-LCD?
The CDTR-2N4E4 does not include an integral LCD, while the CDTR-2N4E4-LCD includes a configurable integral LCD display.
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 with the Dwyer CDTR-2N4E4 CO₂/RH/Temperature Transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
