Dwyer Instruments CDTV-2D4A4 | Duct VOC & CO2 transmitter | Universal analog outputs | 2000PPM CO2 | 10K Ohm Type III temperature sensor
The Dwyer CDTV-2D4A4 is a duct-mounted CO₂ and VOC transmitter designed to monitor indoor air quality and support occupancy-based ventilation control. It measures CO₂ from 0-2000 PPM and provides a VOC output correlated to 0-2000 ppm CO₂ equivalent, with a 10 kΩ Type III thermistor temperature sensor.
The transmitter combines CO₂ and VOC sensing in one device, helping reduce the need for separate transmitters in demand-controlled ventilation applications.
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Part Number: CDTV-2D4A4
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Product Overview
The Dwyer CDTV-2D4A4 is part of the Series CDTV Carbon Dioxide/Volatile Organic Compound (VOC) transmitter range. It is designed to help reduce building energy costs by adjusting the amount of conditioned air according to occupancy and indoor air conditions.
The transmitter simultaneously senses CO₂ and VOC, allowing ventilation systems to respond not only to occupancy-related CO₂ levels but also to fumes and other volatile organic compounds that may require increased exhaust ventilation during lower-occupancy periods.
The CDTV-2D4A4 is designed for duct mounting and measures CO₂ across a 0-2000 PPM range. Its VOC output is correlated to 0-2000 ppm CO₂ equivalent. A 10 kΩ Type III thermistor provides the temperature sensing function.
For CO₂ measurement, the transmitter uses a single-beam dual-wavelength NDIR sensor, while VOC measurement uses a MEMS metal oxide semiconductor sensor. The combination provides CO₂ and VOC monitoring from a single transmitter and supports occupancy-based ventilation strategies.
The CO₂ measurement has an accuracy of ±40 ppm + 3% of reading, with a response time of 2 minutes for a 99% step change. The VOC response time is 5 minutes.
The CDTV-2D4A4 provides jumper-selectable universal analog outputs. Current outputs can be configured for 0-20, 4-20, 0-10 or 2-10 mA, with a maximum load of 500 Ω. Voltage outputs can be configured for 0-10, 2-10, 0-5 or 1-5 VDC, with a minimum load of 500 Ω.
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. Its duct housing is rated NEMA 4X (IP66), housing only, and the unit is designed for duct air velocities from 0-4000 FPM (20.32 m/s).
There is no integral display on the CDTV-2D4A4.
Key Benefits
- Simultaneous CO₂ and VOC monitoring from one transmitter
- 0-2000 PPM CO₂ measurement range
- VOC output correlated to 0-2000 ppm CO₂ equivalent
- 10 kΩ Type III thermistor temperature sensor
- Single-beam dual-wavelength NDIR CO₂ sensor
- MEMS metal oxide semiconductor VOC sensor
- Jumper-selectable universal current and voltage outputs
- Supports occupancy-based and demand-controlled ventilation strategies
- NEMA 4X (IP66) duct housing
- Suitable for duct air velocities up to 4000 FPM (20.32 m/s)
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTV-2D4A4 is suited for HVAC, building automation and facility management applications requiring combined CO₂ and VOC monitoring.
Typical applications include:
- Demand-control ventilation in hospitals, schools and commercial buildings
- Buildings and spaces occupied continuously or for extended periods
- Ventilation systems requiring both occupancy-related CO₂ and VOC monitoring
- Projects where combining CO₂ and VOC sensing can reduce installation costs
- HVAC systems requiring universal analog outputs for connection to controllers
How to Specify & Commission It
- Install the CDTV-2D4A4 duct transmitter according to the manufacturer's installation requirements.
- Connect the required power supply of 16-35 VDC or 19-28 VAC.
- Set the output jumpers according to the required current or voltage output configuration.
- Connect the CO₂ and VOC outputs to the building automation or HVAC controller.
- Verify the transmitter readings during commissioning.
- Allow for the specified response times of approximately 2 minutes for CO₂ and 5 minutes for VOC when evaluating changes in measured conditions.
Frequently Asked Questions
What does the Dwyer CDTV-2D4A4 measure?
The CDTV-2D4A4 measures CO₂ from 0-2000 PPM and provides a VOC output correlated to 0-2000 ppm CO₂ equivalent. It also incorporates a 10 kΩ Type III thermistor temperature sensor.
What sensors does the CDTV-2D4A4 use?
It uses a single-beam dual-wavelength NDIR sensor for CO₂ measurement and a MEMS metal oxide semiconductor sensor for VOC measurement.
What outputs are available on the CDTV-2D4A4?
The transmitter provides jumper-selectable current outputs of 0-20, 4-20, 0-10 and 2-10 mA, or voltage outputs of 0-10, 2-10, 0-5 and 1-5 VDC.
How fast does the CDTV-2D4A4 respond?
The CO₂ response time is 2 minutes for a 99% step change, while the VOC response time is 5 minutes.
Does the CDTV-2D4A4 have a display?
No. The CDTV-2D4A4 does not have an integral display.
What is the enclosure rating?
The duct housing is rated NEMA 4X (IP66), housing only.
What is the duct air velocity range?
The CDTV-2D4A4 is designed for duct air velocities from 0-4000 FPM (20.32 m/s).
Is genuine Dwyer stock available with UAE shipping?
Yes. Genuine Dwyer Instruments stock with free UAE-wide shipping is available through General Tech Services LLC. Call +971 6 5436933 for current pricing and availability.
Request a Quote Today
For pricing, availability or technical assistance with the Dwyer CDTV-2D4A4 VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
