Dwyer Instruments CDTV-2N4A4 | Wall Voc & CO2 transmitter | Universal analog outputs | 2000 ppm CO2 | 10K Ohm Type III temperature sensor
The Dwyer CDTV-2N4A4 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, and jumper-selectable universal analog outputs.
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Part Number: CDTV-2N4A4
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Product Overview
The Dwyer CDTV-2N4A4 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 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.
The CDTV-2N4A4 does not include an integral LCD display, making it suitable for installations where readings are intended to be monitored through a connected building management or control system. The corresponding CDTV-2N4A4-LCD model provides the same transmitter configuration with an integral LCD.
The transmitter includes a 10 kΩ Type III thermistor temperature sensor and 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.
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
- Compact North American wall-mount enclosure
- 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 is suitable for HVAC, building management and indoor air quality applications where CO₂ and VOC levels need to be monitored from a single wall-mounted transmitter.
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
How to Specify & Commission It
- Mount the CDTV-2N4A4 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 readings after installation and commissioning.
- 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 measure?
The transmitter measures CO₂ from 0-2000 PPM and VOC from 0-2000 ppm CO₂ equivalent simultaneously.
What sensors does the CDTV-2N4A4 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 CDTV-2N4A4 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 have a display?
No. The CDTV-2N4A4 does not include an integral LCD. The CDTV-2N4A4-LCD is the corresponding version with an integral LCD display.
What temperature sensor does the CDTV-2N4A4 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 VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
