Dwyer Instruments CDTV-2N4B4-LCD | Wall Voc & CO2 transmitter | Universal analog outputs | 2000 ppm CO2 | 10K Ohm Type II temperature sensor with LCD display
The Dwyer CDTV-2N4B4-LCD is a wall-mount carbon dioxide and volatile organic compound (VOC) transmitter designed to monitor CO₂ and VOC levels 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 II thermistor temperature sensor, universal jumper-selectable analog outputs and an integral LCD display.
Genuine Dwyer Instruments stock · Free UAE-wide shipping
Part Number: CDTV-2N4B4-LCD
Request a quote in under a minute — call +971 6 5436933.
Product Overview
The Dwyer CDTV-2N4B4-LCD combines carbon dioxide and volatile organic compound sensing in one wall-mounted transmitter, helping building operators monitor occupancy-related ventilation requirements and indoor air contaminants without installing separate CO₂ and VOC transmitters.
The transmitter measures CO₂ from 0 to 2000 PPM using a single-beam, dual-wavelength NDIR sensor. Its VOC measurement uses a MEMS metal oxide semiconductor sensor, with the VOC output correlated to CO₂ equivalent from 0 to 2000 ppm.
By sensing both CO₂ and VOC, the CDTV can provide information useful for occupancy-based ventilation as well as the detection of fumes or odors that may require exhaust ventilation during lower-occupancy periods. Combining both measurements in one transmitter can also reduce installation material and labor requirements compared with separate sensors.
The CO₂ sensor is designed for use in spaces occupied 24 hours a day, while the VOC sensor provides an additional measurement for environments where volatile organic compounds may influence ventilation requirements.
The CDTV-2N4B4-LCD 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.
An integral LCD display provides local readings, making it possible to view transmitter measurements without relying exclusively on the connected building management controller.
The transmitter operates from 16-35 VDC or 19-28 VAC and has average power consumption of approximately 2 W, with 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.
If an integral display is not required, the CDTV-2N4B4 provides the same transmitter configuration without the LCD.
Key Benefits
- Simultaneous CO₂ and VOC measurement from one transmitter
- 0-2000 PPM CO₂ measurement range
- VOC measurement correlated to 0-2000 ppm CO₂ equivalent
- Single-beam dual-wavelength NDIR CO₂ sensor
- MEMS metal oxide semiconductor VOC sensor
- Suitable for spaces occupied 24 hours a day
- Jumper-selectable universal current and voltage outputs
- Integral LCD for convenient local readings
- 10 kΩ Type II thermistor temperature sensor
- Helps support occupancy-based ventilation applications
- Combines CO₂ and VOC sensing in one device
- Genuine Dwyer Instruments stock with free UAE-wide shipping
Who This Product Is Best For
The Dwyer CDTV-2N4B4-LCD is suited for HVAC, building management and indoor air quality applications where both carbon dioxide and VOC levels need to be monitored from a single wall-mounted device.
Typical applications include:
- Demand-controlled ventilation in commercial buildings
- Ventilation and odor control in hospitals and schools
- Offices and other occupied buildings
- Waiting rooms and spaces occupied 24 hours a day
- Indoor environments requiring combined CO₂ and VOC monitoring
- Projects looking to reduce installation costs by combining multiple measurements in one transmitter
How to Specify & Commission It
- Mount the CDTV-2N4B4-LCD 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 local LCD readings and controller values after installation.
- 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-2N4B4-LCD measure?
The transmitter measures CO₂ from 0-2000 PPM and VOC from 0-2000 ppm CO₂ equivalent simultaneously.
What sensors does the CDTV-2N4B4-LCD 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 II 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 transmitter 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-2N4B4-LCD have a display?
Yes. This version includes an integral LCD display for local readings. The CDTV-2N4B4 is the corresponding version without the integral LCD.
What is the operating temperature range?
The transmitter operates from 32 to 122°F (0 to 50°C).
What is the VOC measurement range?
The VOC output is correlated to 0-2000 ppm CO₂ equivalent.
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-2N4B4-LCD VOC and CO₂ transmitter, contact General Tech Services LLC.
Call: +971 6 5436933
Website: www.generaltechshop.ae
