Dwyer CDTV-2D4B4 Carbon Dioxide Transmitter is a reliable and accurate device for measuring CO2 and VOC levels. It has a wide temperature range of 32 to 122°F and operates on a power requirement of 16 to 35 VDC / 19 to 28 VAC. With a response time of 2 minutes for CO2 and 5 minutes for VOC, it offers quick and efficient results. The transmitter is enclosed in a durable NEMA 4X (IP66) duct mount housing. It features a single-beam, dual-wavelength NDIR sensor for CO2 and a MEMS metal oxide semiconductor sensor for VOC. The output options include current, voltage, and relay. The transmitter has low power consumption and is highly accurate with an accuracy of ±40 ppm ±3% of reading for CO2. It is also pressure and temperature dependent. With a velocity range of 0-4000 FPM, it is suitable for various applications. Overall, it is a versatile and high-performance solution for monitoring CO2 and VOC levels.