Dwyer Instruments CDTR-2N4E4-LCD | Carbon Dioxide/Temperature/Humidity | Wall Mount | Universal current/voltage output | Pt1000 O RTD Temperature Output | North American Housing | LCD Display
The Dwyer Instruments CDTR-2N4E4-LCD 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, along with universal analog outputs and a configurable integral LCD display.
The North American housing configuration makes this transmitter suitable for HVAC, building management, demand-controlled ventilation, and indoor environmental monitoring applications.
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Part Number: CDTR-2N4E4-LCD
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Product Overview
The Dwyer CDTR-2N4E4-LCD is part of the Series CDTR Carbon Dioxide, Relative Humidity and Temperature Transmitters, designed to reduce the number of separate sensors required for wall or duct installations.
This model measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, while providing temperature measurement through a Pt1000 Ω RTD output.
For CO₂ measurement, the transmitter uses a single-beam dual-wavelength NDIR sensor that automatically corrects the measurement for light-source aging. The CDTR also provides digital barometric pressure adjustment and field calibration, helping users configure the transmitter for installation conditions.
The Digital Intelligence Temperature Compensation Algorithm (DITCA™) is designed to eliminate errors associated with self-heating in wall-mounted combination devices, supporting reliable environmental measurements.
Universal analog outputs allow CO₂ and relative humidity signals to be configured as 4-20 mA, 0-5 VDC, or 0-10 VDC. This provides compatibility with a wide range of building management controllers and HVAC automation systems.
The transmitter also includes an integral configurable LCD display. Users can configure the display to show temperature only, RH only, CO₂ only, CO₂ and humidity, or CO₂ and temperature, providing convenient local visibility of environmental conditions.
The humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect configuration settings.
For installations that do not require a local display, the CDTR-2N4E4 provides the same transmitter configuration without the 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
- Configurable integral LCD display
- North American wall-mount housing
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2N4E4-LCD is suited for:
- Demand-controlled ventilation systems
- Schools, offices, hospitals, and other indoor environments
- HVAC monitoring and control
- Building management system (BMS) projects
- LEED-driven ventilation monitoring
- Applications requiring CO₂, RH, and temperature from one device
- Retrofit projects where multiple environmental sensors need to be consolidated
- Installations requiring both analog controller integration and local LCD monitoring
How to Specify & Commission It
- Mount the CDTR-2N4E4-LCD 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.
- Configure the integral LCD to display the required combination of temperature, RH, and CO₂.
- 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-LCD measure?
It measures CO₂ from 0-2000 PPM, relative humidity from 0-100% RH, and temperature through a Pt1000 Ω RTD output.
What type of CO₂ sensor does it use?
The transmitter uses a single-beam dual-wavelength NDIR sensor designed to automatically correct 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-LCD provide?
It provides a Pt1000 Ω RTD temperature output.
Does the CDTR-2N4E4-LCD have a display?
Yes. It includes an integral configurable LCD display.
What can the LCD display show?
The LCD can be configured to show temperature only, RH only, CO₂ only, CO₂ and humidity, or CO₂ and temperature.
Can the transmitter be calibrated in the field?
Yes. The CDTR-2N4E4-LCD provides digital barometric pressure adjustment and field calibration.
Does it require regular calibration verification?
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-LCD and CDTR-2N4E4?
The CDTR-2N4E4-LCD includes an integral configurable LCD, while the CDTR-2N4E4 is the corresponding version without the integral 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-LCD CO₂/RH/Temperature Transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
