{"product_id":"dwyer-instruments-cdtr-2d4a4-carbon-dioxide-rh-temperature-transmitter-2000-ppm-co2-range-duct-mount-4-to-20-ma-0-to-5-or-10-vdc-co2-output-rh-outputs-10-ko-type-3-thermistor-temperature-output-6","title":"Dwyer Instruments CDTR-2D4A4 | Carbon Dioxide\/RH\/Temperature Transmitter | 2000 ppm CO2 range | Duct mount | 4 to 20 mA\/0 to (5 or 10) VDC CO2 output | RH outputs \u0026 10 kO Type 3 thermistor temperature output","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDwyer Instruments CDTR-2D4A4\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a duct mount CO₂, relative humidity and temperature transmitter designed for indoor air quality monitoring and demand-controlled ventilation applications. It measures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0-2000 PPM CO₂\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0-100% RH\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor temperature output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe transmitter provides universal \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-20 mA, 0-5 VDC or 0-10 VDC outputs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for CO₂ and RH and features a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNEMA 4X (IP66) duct housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eGenuine Dwyer Instruments stock · Free UAE-wide shipping\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003ePart Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e CDTR-2D4A4\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRequest a quote in under a minute — call \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e+971 6 5436933\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDwyer CDTR-2D4A4\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e combines carbon dioxide, relative humidity and temperature measurement in a single duct-mounted transmitter, reducing the need for multiple sensors in HVAC and building automation systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt provides a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0-2000 PPM CO₂ measurement range\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0-100% RH measurement range\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, together with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor temperature output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. This combination allows HVAC and building management systems to monitor key indoor environmental conditions through one duct-mounted device.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe transmitter uses a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esingle-beam dual-wavelength NDIR sensor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for CO₂ measurement. The sensor automatically corrects the CO₂ measurement for light-source aging in occupied and unoccupied buildings. The CDTR-2D4A4 also provides \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edigital barometric pressure adjustment and field calibration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e capabilities.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDwyer's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDigital Intelligence Temperature Compensation Algorithm (DITCA™)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e helps eliminate measurement error associated with self-heating in combination sensing devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUniversal analog outputs for CO₂ and RH can be selected as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-20 mA, 0-5 VDC or 0-10 VDC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, allowing integration with a wide range of building management controllers. The current output supports a maximum 500 Ω load, while voltage outputs require a minimum 500 Ω load.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe humidity and temperature sensors are replaceable, while a physical hardware lockout helps protect configuration settings. The transmitter does not include an integral display, but a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eservice display tool\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is available for setup and calibration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe CDTR-2D4A4 features a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNEMA 4X (IP66) duct housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and supports duct air velocities from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0 to 4000 FPM (20.32 m\/s)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCO₂, relative humidity and temperature\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in one duct-mounted device\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e0-2000 PPM CO₂\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e measurement range\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e0-100% RH\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e measurement range\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e temperature output\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSingle-beam dual-wavelength NDIR CO₂ sensor\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic correction for CO₂ sensor light-source aging\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDigital barometric pressure adjustment and field calibration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDITCA™ temperature compensation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eUniversal \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-20 mA, 0-5 VDC and 0-10 VDC outputs\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplaceable humidity and temperature sensors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePhysical hardware lockout\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eNEMA 4X (IP66)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e duct housing\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for demand-controlled ventilation and building automation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGenuine Dwyer Instruments stock with free UAE-wide shipping\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eWho This Product Is Best For\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDwyer CDTR-2D4A4\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is suitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHVAC engineers, facility managers, building automation professionals and system integrators\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e who need CO₂, humidity and temperature measurements from a single duct-mounted transmitter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTypical applications include \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edemand-controlled ventilation in schools, offices, hospitals and other occupied buildings\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, indoor air quality monitoring, building management systems and ventilation projects requiring combined CO₂, RH and temperature measurement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt is also suitable for projects where environmental measurements are required for ventilation control and energy-efficiency monitoring.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eHow to Specify \u0026amp; Commission It\u003c\/span\u003e\u003c\/h2\u003e\n\u003col data-spread=\"false\" start=\"1\"\u003e\n\u003cli\u003e\n\u003cspan\u003eInstall the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCDTR-2D4A4 duct mount transmitter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e according to the manufacturer's installation requirements.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eConnect the appropriate \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e16-35 VDC or 19-28 VAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e power supply.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eWire the CO₂ and RH outputs and select \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-20 mA, 0-5 VDC or 0-10 VDC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e as required.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eConnect the temperature output from the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to the appropriate controller input.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSet the required barometric pressure value.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePerform field calibration if required using the service display tool.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eVerify CO₂, RH and temperature readings at the connected controller before commissioning.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat does the Dwyer CDTR-2D4A4 measure?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe CDTR-2D4A4 measures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCO₂ from 0-2000 PPM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and relative humidity from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0-100% RH\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor temperature output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat type of temperature sensor does the CDTR-2D4A4 use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt uses a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10 kΩ Type III thermistor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for temperature measurement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat outputs are available?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe transmitter provides universal \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-20 mA, 0-5 VDC or 0-10 VDC outputs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for CO₂ and RH.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eHow accurate is the CDTR-2D4A4?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCO₂ accuracy is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e±40 ppm + 3% of reading\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while relative humidity accuracy is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e±2%\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat type of CO₂ sensor does it use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe transmitter uses a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esingle-beam, dual-wavelength NDIR sensor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with automatic correction for light-source aging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eDoes the CDTR-2D4A4 have a display?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNo. The transmitter has \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eno integral display\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. A service display tool is available for setup and calibration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eDoes the CDTR-2D4A4 require recalibration?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor buildings occupied 24 hours a day, Dwyer recommends verifying calibration every \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6 to 12 months\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, depending on the application.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat is the enclosure rating?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe duct housing is rated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNEMA 4X (IP66)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat power supply does it require?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe transmitter operates from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e16-35 VDC or 19-28 VAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Average power consumption is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2 W\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with peak consumption of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.75 W\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eIs genuine stock available with UAE shipping?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. Genuine Dwyer Instruments stock is available through General Tech Services LLC with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003efree UAE-wide shipping\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Call \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e+971 6 5436933\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for pricing and current availability.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eRequest a Quote Today\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor pricing, availability or technical assistance for the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDwyer CDTR-2D4A4 CO₂\/RH\/temperature transmitter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, contact General Tech Services LLC.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eCall:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e +971 6 5436933\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eWebsite:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/www.generaltechshop.ae\"\u003e\u003cspan\u003ewww.generaltechshop.ae\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Dwyer","offers":[{"title":"Default Title","offer_id":42170598457457,"sku":"CDTR-2D4A4","price":0.0,"currency_code":"AED","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0625\/3930\/0977\/files\/1229731Dwyer_Instruments_CDTR-2D4A4.jpg?v=1751910936","url":"https:\/\/www.generaltechkuwait.com\/products\/dwyer-instruments-cdtr-2d4a4-carbon-dioxide-rh-temperature-transmitter-2000-ppm-co2-range-duct-mount-4-to-20-ma-0-to-5-or-10-vdc-co2-output-rh-outputs-10-ko-type-3-thermistor-temperature-output-6","provider":"General Tech Services LLC","version":"1.0","type":"link"}