Dwyer Instruments CDTV-2D404 | Duct VOC & CO2 transmitter | Universal analog outputs | 2000PPM CO2 | No temperature
The Dwyer CDTV-2D404 is a duct-mounted CO₂ and VOC transmitter designed for indoor air quality monitoring and occupancy-based ventilation control. It measures CO₂ from 0-2000 PPM and provides a VOC output correlated to 0-2000 ppm CO₂ equivalent, with no temperature output.
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Part Number: CDTV-2D404
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Product Overview
The Dwyer CDTV-2D404 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 measured indoor air conditions.
By monitoring both CO₂ and VOC, the transmitter can provide ventilation control based on occupancy while also detecting fumes and volatile organic compounds that may require additional exhaust during lower-occupancy periods.
The CDTV-2D404 is a duct mount model with a 0-2000 PPM CO₂ measurement range and a VOC output correlated to 0-2000 ppm CO₂ equivalent. This model has no temperature output.
For CO₂ measurement, the transmitter uses a single-beam dual-wavelength NDIR sensor, while a MEMS metal oxide semiconductor sensor measures VOC. Combining both measurements in one transmitter can reduce the need for separate CO₂ and VOC devices and simplify installation for ventilation control systems.
The CO₂ measurement accuracy is ±40 ppm + 3% of reading. The CO₂ response time is 2 minutes for a 99% step change, while the VOC response time is 5 minutes.
The CDTV-2D404 features 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. The duct housing is rated NEMA 4X (IP66), housing only, and supports duct air velocities from 0-4000 FPM (20.32 m/s).
The CDTV-2D404 does not include an integral display.
Key Benefits
- Simultaneous CO₂ and VOC monitoring from one duct transmitter
- 0-2000 PPM CO₂ measurement range
- VOC output correlated to 0-2000 ppm CO₂ equivalent
- No temperature output for applications that do not require temperature measurement
- 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-2D404 is suited for HVAC, building automation and facility management applications requiring combined CO₂ and VOC monitoring without a temperature output.
Typical applications include:
- Demand-controlled ventilation in hospitals, schools and commercial buildings
- Spaces occupied continuously or for extended periods, such as waiting rooms
- HVAC systems requiring both CO₂ and VOC monitoring
- Projects where combining CO₂ and VOC sensing can reduce installation requirements
- Building automation systems requiring universal analog outputs
- Ventilation and odor-control applications
How to Specify & Commission It
- Install the CDTV-2D404 duct transmitter according to the manufacturer's 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 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 changing conditions.
Frequently Asked Questions
What does the Dwyer CDTV-2D404 measure?
The CDTV-2D404 measures CO₂ from 0-2000 PPM and VOC from 0-2000 ppm CO₂ equivalent simultaneously.
What sensors does the CDTV-2D404 use?
It uses a single-beam dual-wavelength NDIR sensor for CO₂ measurement and a MEMS metal oxide semiconductor sensor for VOC measurement.
Does the CDTV-2D404 have a temperature sensor?
No. The CDTV-2D404 has no temperature output.
What analog outputs are available?
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-2D404 respond?
The CO₂ response time is 2 minutes for a 99% step change, while the VOC response time is 5 minutes.
Does the CDTV-2D404 have a display?
No. The CDTV-2D404 has no integral display.
What is the enclosure rating?
The duct housing has a NEMA 4X (IP66) rating, housing only.
What is the duct air velocity range?
The CDTV-2D404 is designed for duct air velocities from 0-4000 FPM (20.32 m/s).
Is genuine 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 pricing and current availability.
Request a Quote Today
For pricing, availability or technical assistance with the Dwyer CDTV-2D404 VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
