Dwyer Instruments CDTV-2D4D4 | Duct VOC & CO2 transmitter | Universal analog outputs | 2000PPM CO2 | PT100 Ohm RTD temperature sensor
The Dwyer CDTV-2D4D4 is a duct-mounted carbon dioxide and volatile organic compound (VOC) transmitter with a 0-2000 PPM CO₂ range, VOC output correlated to 0-2000 ppm CO₂ equivalent, universal analog outputs, and a Pt100 Ω RTD temperature sensor. Its NEMA 4X (IP66) duct housing is designed for HVAC and building automation applications.
Genuine Dwyer Instruments stock · Free UAE-wide shipping
Part Number: CDTV-2D4D4
Request a quote in under a minute — call +971 6 5436933.
Product Overview
The Dwyer CDTV-2D4D4 combines CO₂ and VOC measurement in a single duct-mounted transmitter, helping building operators monitor occupancy-related CO₂ levels while also detecting VOC conditions that may require ventilation.
The transmitter measures CO₂ from 0 to 2000 PPM and provides a VOC output correlated to 0-2000 ppm CO₂ equivalent. By combining CO₂ and VOC sensing in one device, the CDTV-2D4D4 can reduce the need for separate transmitters and simplify installation in HVAC and building automation systems.
The CO₂ measurement uses a single-beam, dual-wavelength NDIR sensor, while VOC measurement uses a MEMS metal oxide semiconductor sensor. The CO₂ sensor is suitable for spaces occupied 24 hours a day, while the combined outputs can support occupancy-based ventilation strategies.
The CDTV-2D4D4 includes a Pt100 Ω RTD temperature sensor and provides jumper-selectable universal analog outputs. Current output can be configured as 0-20, 4-20, 0-10 or 2-10 mA, while voltage output can be configured as 0-10, 2-10, 0-5 or 1-5 VDC.
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 NEMA 4X (IP66) housing is designed for duct installation, with a supported duct air velocity range of 0-4000 FPM (20.32 m/s).
CO₂ response time is 2 minutes for a 99% step change, while VOC response time is 5 minutes. The unit does not include an integral display.
Key Benefits
- Simultaneous CO₂ and VOC measurement from one transmitter
- 0-2000 PPM CO₂ range
- VOC output correlated to 0-2000 ppm CO₂ equivalent
- Pt100 Ω RTD temperature sensor
- Single-beam dual-wavelength NDIR CO₂ sensor
- MEMS metal oxide semiconductor VOC sensor
- Jumper-selectable universal current and voltage outputs
- NEMA 4X (IP66) duct housing
- Supports duct air velocities up to 4000 FPM (20.32 m/s)
- Suitable for occupancy-based and demand-controlled ventilation
- No integral display
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTV-2D4D4 is suited for HVAC engineers, building automation professionals and facility operators who need combined CO₂ and VOC monitoring in ducted air-handling systems.
It is particularly useful for:
- Demand-controlled ventilation in commercial buildings
- Hospitals, schools and other institutional facilities
- Buildings requiring VOC and CO₂ monitoring for ventilation control
- Spaces occupied 24 hours a day
- HVAC systems where separate CO₂ and VOC transmitters would increase installation costs
- Building automation systems requiring flexible analog outputs
How to Specify & Commission It
- Mount the duct-mounted CDTV-2D4D4 according to the installation requirements.
- Connect the appropriate power supply and configure the output jumpers for the required current or voltage range.
- Connect the CO₂, VOC and temperature outputs to the building controller as required.
- Verify the readings at the controller after installation.
- Allow approximately 2 minutes for CO₂ and 5 minutes for VOC response when evaluating a step change.
Frequently Asked Questions
What does the CDTV-2D4D4 measure?
The CDTV-2D4D4 measures CO₂ from 0-2000 PPM and VOC with an output correlated to 0-2000 ppm CO₂ equivalent. It also includes a Pt100 Ω RTD temperature sensor.
What sensors does the CDTV-2D4D4 use?
It uses a single-beam, dual-wavelength NDIR sensor for CO₂ and a MEMS metal oxide semiconductor sensor for VOC. Temperature is measured using a Pt100 Ω RTD.
What analog outputs are available?
The current output can be jumper selected between 0-20, 4-20, 0-10 and 2-10 mA. Voltage output can be selected between 0-10, 2-10, 0-5 and 1-5 VDC.
How fast does the CDTV-2D4D4 respond?
CO₂ response time is 2 minutes for a 99% step change, while VOC response time is approximately 5 minutes.
Does the CDTV-2D4D4 have a display?
No. This model does not include an integral display.
What is the enclosure rating?
The CDTV-2D4D4 has a NEMA 4X (IP66) duct housing, with the rating specified for the housing.
What duct air velocity can the transmitter handle?
The supported duct air velocity range is 0-4000 FPM (20.32 m/s).
What is the CO₂ accuracy?
CO₂ accuracy is ±40 PPM + 3% of reading.
What power supply does it require?
The CDTV-2D4D4 operates from 16-35 VDC or 19-28 VAC. Average power consumption is 2 W, with a peak consumption of 3.75 W.
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 CDTV-2D4D4 VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
