Dwyer Instruments CDTV-2N4B4 | Wall Voc & CO2 transmitter | Universal analog outputs | 2000 ppm CO2 | 10K Ohm Type II temperature sensor
The Dwyer CDTV-2N4B4 is a wall-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 10 kΩ Type II thermistor temperature sensor. Its North American wall-mount housing is designed for HVAC, building automation and demand-controlled ventilation applications.
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Part Number: CDTV-2N4B4
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Product Overview
The Dwyer CDTV-2N4B4 combines CO₂ and VOC measurement in one compact wall-mounted transmitter, helping building operators monitor occupancy-related carbon dioxide levels while also detecting VOC conditions that may require additional ventilation.
The transmitter measures CO₂ from 0 to 2000 PPM and provides a VOC output correlated to 0-2000 ppm CO₂ equivalent. Combining these measurements in one device can reduce the need for separate transmitters and simplify installation in HVAC and building automation systems.
The CDTV-2N4B4 uses a single-beam, dual-wavelength NDIR CO₂ sensor and a MEMS metal oxide semiconductor VOC sensor. The NDIR CO₂ sensor is designed for use in spaces occupied 24 hours a day, while the VOC measurement can help identify fumes and other air-quality conditions during periods of lower occupancy.
A 10 kΩ Type II thermistor provides temperature sensing. The transmitter also features 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 CDTV-2N4B4 operates from 16-35 VDC or 19-28 VAC, with average power consumption of 2 W and peak consumption of 3.75 W. The North American wall-mount enclosure has an IP20 rating and operates from 32 to 122°F (0 to 50°C).
CO₂ response time is 2 minutes for a 99% step change, while VOC response time is 5 minutes. This model does not include an integral display. The CDTV-2N4B4-LCD is the corresponding configuration with an integral LCD display.
Key Benefits
- Simultaneous CO₂ and VOC measurement from one wall-mounted device
- 0-2000 PPM CO₂ range
- VOC output correlated to 0-2000 ppm CO₂ equivalent
- 10 kΩ Type II thermistor temperature sensor
- Single-beam dual-wavelength NDIR CO₂ sensor
- MEMS metal oxide semiconductor VOC sensor
- Jumper-selectable universal current and voltage outputs
- Compact North American wall-mount housing
- Suitable for demand-controlled ventilation and building automation
- No integral display
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTV-2N4B4 is suited for HVAC engineers, facility managers and building automation professionals who need combined CO₂ and VOC monitoring from a single wall-mounted transmitter.
It is particularly useful for:
- Demand-controlled ventilation in hospitals, schools and commercial buildings
- Spaces occupied 24 hours a day, including waiting rooms and similar facilities
- HVAC and building automation systems
- Applications requiring both occupancy-related CO₂ and VOC monitoring
- Projects where combining CO₂ and VOC sensing can reduce installation requirements
- Systems requiring flexible analog output ranges
How to Specify & Commission It
- Mount the North American wall-mount transmitter 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 and VOC outputs to the building controller.
- Connect the temperature output as required by the control system.
- Verify the readings at the controller and allow approximately 2 minutes for CO₂ and 5 minutes for VOC response when evaluating a step change.
Frequently Asked Questions
What does the CDTV-2N4B4 measure?
The CDTV-2N4B4 measures CO₂ from 0-2000 PPM and VOC with an output correlated to 0-2000 ppm CO₂ equivalent. It also includes a 10 kΩ Type II thermistor temperature sensor.
What sensors does the CDTV-2N4B4 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 10 kΩ Type II thermistor.
What 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 accurate is the CO₂ measurement?
CO₂ accuracy is ±40 PPM + 3% of reading.
How fast does the CDTV-2N4B4 respond?
CO₂ response time is 2 minutes for a 99% step change, while VOC response time is approximately 5 minutes.
Does the CDTV-2N4B4 have a display?
No. This model does not include an integral display. The CDTV-2N4B4-LCD provides the corresponding version with an integral LCD.
What is the difference between CDTV-2N4B4 and CDTV-2N4B4-LCD?
Both models provide CO₂, VOC and temperature sensing with the same general wall-mount configuration. The CDTV-2N4B4-LCD includes an integral LCD, while the CDTV-2N4B4 does not.
What is the enclosure rating?
The CDTV-2N4B4 has an IP20 enclosure rating.
What power supply does the CDTV-2N4B4 require?
It operates from 16-35 VDC or 19-28 VAC. Average power consumption is 2 W, with a peak 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-2N4B4 VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
