Dwyer Instruments CDTV-2N4A4-LCD | Wall Voc & CO2 transmitter | Universal analog outputs | 2000 ppm CO2 | 10K Ohm Type III temperature sensor with LCD display
The Dwyer CDTV-2N4A4-LCD is a wall-mount carbon dioxide and volatile organic compound (VOC) transmitter designed to monitor CO₂ and VOC simultaneously in indoor environments. It provides a 0-2000 PPM CO₂ range, VOC output correlated to 0-2000 ppm CO₂ equivalent, a 10 kΩ Type III thermistor temperature sensor, universal jumper-selectable analog outputs and an integral LCD display.
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Part Number: CDTV-2N4A4-LCD
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Product Overview
The Dwyer CDTV-2N4A4-LCD combines carbon dioxide and volatile organic compound sensing in one compact wall-mounted transmitter, helping reduce the need for separate CO₂ and VOC transmitters in indoor air quality and building ventilation applications.
The transmitter measures CO₂ from 0 to 2000 PPM using a single-beam, dual-wavelength NDIR sensor. VOC measurement is provided by a MEMS metal oxide semiconductor sensor, with the VOC output correlated to 0-2000 ppm CO₂ equivalent.
By monitoring both CO₂ and VOC, the CDTV-2N4A4-LCD can provide information useful for occupancy-based ventilation as well as detecting fumes or odors that may require exhaust ventilation during lower-occupancy periods. Combining both measurements in one transmitter can reduce material and installation requirements compared with installing separate devices.
The single-beam dual-wavelength NDIR CO₂ sensor supports applications in spaces occupied 24 hours a day, while the MEMS VOC sensor provides additional information about volatile organic compounds that can influence ventilation requirements.
The transmitter provides jumper-selectable universal analog outputs. Current output can be configured as 0-20, 4-20, 0-10 or 2-10 mA, with a maximum load of 500 Ω. Voltage output can be configured as 0-10, 2-10, 0-5 or 1-5 VDC, with a minimum load of 500 Ω.
An integral LCD display provides local readings, allowing users to view transmitter measurements directly at the installation point without relying exclusively on the connected building management controller.
The CDTV-2N4A4-LCD also includes a 10 kΩ Type III thermistor temperature sensor. The transmitter operates from 16-35 VDC or 19-28 VAC, with average power consumption of approximately 2 W and peak consumption of 3.75 W.
It is designed for operating temperatures from 32 to 122°F (0 to 50°C) and has an IP20 enclosure rating.
If an integral display is not required, the CDTV-2N4A4 provides the corresponding transmitter configuration without the LCD display.
Key Benefits
- Simultaneous CO₂ and VOC measurement from one device
- 0-2000 PPM CO₂ measurement range
- VOC output correlated to 0-2000 ppm CO₂ equivalent
- Single-beam dual-wavelength NDIR CO₂ sensor
- MEMS metal oxide semiconductor VOC sensor
- 10 kΩ Type III thermistor temperature sensor
- Suitable for spaces occupied 24 hours a day
- Jumper-selectable universal current and voltage outputs
- Integral LCD display for local readings
- Supports occupancy-based ventilation applications
- Combines CO₂ and VOC sensing in one transmitter
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTV-2N4A4-LCD is suited for HVAC, building management and indoor air quality applications where CO₂ and VOC levels need to be monitored from one wall-mounted device with local display capability.
Typical applications include:
- Demand-controlled ventilation in hospitals, schools and commercial buildings
- Odor and ventilation control
- Offices and other occupied buildings
- Spaces occupied 24 hours a day, including waiting rooms
- Indoor environments requiring combined CO₂ and VOC monitoring
- Projects looking to reduce installation requirements by combining CO₂ and VOC sensing
- Applications where local LCD readings are useful during operation or commissioning
How to Specify & Commission It
- Mount the CDTV-2N4A4-LCD on the wall according to the installation requirements.
- Connect the required 16-35 VDC or 19-28 VAC power supply.
- Set the output jumpers for the required current or voltage configuration.
- Connect the CO₂ and VOC outputs to the building management or control system.
- Verify the local LCD readings and controller values after installation.
- Allow approximately 2 minutes for a 99% CO₂ step change and 5 minutes for VOC response when verifying system operation.
Frequently Asked Questions
What does the Dwyer CDTV-2N4A4-LCD measure?
The transmitter measures CO₂ from 0-2000 PPM and VOC from 0-2000 ppm CO₂ equivalent simultaneously.
What sensors does the CDTV-2N4A4-LCD use?
It uses a single-beam dual-wavelength NDIR sensor for CO₂ and a MEMS metal oxide semiconductor sensor for VOC. It also includes a 10 kΩ Type III thermistor temperature sensor.
What output configurations are available?
The transmitter provides jumper-selectable current outputs of 0-20, 4-20, 0-10 or 2-10 mA, and voltage outputs of 0-10, 2-10, 0-5 or 1-5 VDC.
How accurate is the CO₂ measurement?
CO₂ accuracy is ±40 ppm + 3% of reading.
How quickly does the transmitter respond?
The CO₂ sensor has a response time of approximately 2 minutes for a 99% step change, while the VOC sensor has a response time of approximately 5 minutes.
Does the CDTV-2N4A4-LCD have a display?
Yes. This model includes an integral LCD display for local readings. The CDTV-2N4A4 is the corresponding version without an integral LCD.
What temperature sensor does the CDTV-2N4A4-LCD use?
It uses a 10 kΩ Type III thermistor temperature sensor.
What is the VOC measurement range?
The VOC output is correlated to 0-2000 ppm CO₂ equivalent.
What is the operating temperature range?
The transmitter operates from 32 to 122°F (0 to 50°C).
Is genuine Dwyer stock available with UAE shipping?
Yes. General Tech Services LLC supplies genuine Dwyer Instruments stock with free UAE-wide shipping. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing, availability or technical assistance for the Dwyer CDTV-2N4A4-LCD VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
