Dwyer Instruments CDTR-2N4D4-LCD | Carbon Dioxide/Temperature/Humidity | Wall Mount | Universal current/voltage output | Pt100 O RTD Temperature Output | North American Housing | LCD Display
The Dwyer CDTR-2N4D4-LCD is a wall-mount CO₂/RH/temperature transmitter with a 0-2000 PPM CO₂ range, 0-100% relative humidity measurement, a Pt100 Ω RTD temperature output, universal analog outputs, and a configurable integral LCD display. The unit uses a North American housing for wall-mounted indoor applications.
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Part Number: CDTR-2N4D4-LCD
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Product Overview
The Dwyer CDTR-2N4D4-LCD combines carbon dioxide, relative humidity, and temperature measurement in a single wall-mounted device, helping reduce the number of individual sensors required in indoor building applications.
It measures CO₂ from 0 to 2000 PPM and relative humidity from 0 to 100% RH, while providing a Pt100 Ω RTD temperature output. The transmitter is designed for wall mounting and uses a North American housing configuration.
A single-beam, dual-wavelength NDIR sensor measures carbon dioxide and automatically compensates for light-source aging. Digital barometric pressure adjustment and field calibration capabilities help maintain accurate CO₂ measurement during commissioning and service.
The transmitter also incorporates Dwyer's Digital Intelligence Temperature Compensation Algorithm (DITCA™), which 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 and control systems. The current output supports a maximum load of 500 Ω, while the voltage outputs require a minimum load of 500 Ω.
For local viewing, the integral LCD can be configured to display temperature, relative humidity, CO₂, CO₂ and humidity, or CO₂ and temperature. Humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect configuration settings.
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 rated for 10-95% RH, non-condensing, and operates across 32 to 122°F (0 to 50°C).
Need a different configuration? The CDTR-2N4D4 is the same transmitter without the 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
- Configurable integral LCD display
- Replaceable humidity and temperature sensors
- Physical hardware lockout for configuration protection
- Suitable for building management and demand-controlled ventilation applications
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTR-2N4D4-LCD is suited for building automation and HVAC applications where CO₂, humidity, and temperature need to be monitored from a single wall-mounted transmitter.
Typical applications include:
- Demand-controlled ventilation in offices, schools, hospitals, and other occupied buildings
- Building management system (BMS) monitoring
- Indoor air quality monitoring
- Projects requiring CO₂ and humidity measurement with temperature output
- Ventilation monitoring for energy-efficiency and LEED-related projects
How to Specify & Commission It
- Mount the CDTR-2N4D4-LCD on the wall according to the installation instructions.
- Connect the required power supply using either 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.
- Configure the integral LCD to show the required measurement parameters.
- Verify CO₂, RH, and temperature readings at the connected controller before commissioning.
Frequently Asked Questions
What does the Dwyer CDTR-2N4D4-LCD 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-LCD?
CO₂ accuracy is ±40 ppm + 3% of reading, while relative humidity accuracy is ±2%.
Does the CDTR-2N4D4-LCD have a display?
Yes. It has an integral configurable LCD that can display temperature, RH, CO₂, CO₂ and humidity, or CO₂ and temperature.
What type of CO₂ sensor does it use?
It uses a single-beam, dual-wavelength NDIR sensor with automatic correction for CO₂ measurement changes caused by light-source aging.
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 an alternative without the LCD?
Yes. The Dwyer CDTR-2N4D4 is the same transmitter configuration without the 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-LCD CO₂/RH/temperature transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
