Collection: Indoor Air Quality (IAQ) and Combo Sensors
Indoor Air Quality (IAQ) directly impacts occupant health and productivity in commercial buildings. Poor ventilation and pollutants such as mold, VOCs, CO₂, and particulate matter can cause headaches, fatigue, and reduced performance — while well-managed air quality improves comfort and well-being. IAQ and combo sensors monitor these conditions and signal HVAC systems to automatically adjust for cleaner air. Combo sensors measure multiple parameters in a single device, with many models combining temperature and relative humidity, and others adding CO₂, CO, NO₂, or particulate matter monitoring. We carry IAQ and combo sensors from Senva, Gentex, Siemens, Greystone, and other trusted manufacturers.
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Greystone CDD4B101T7S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10,000 ohm type 3 thermistor and override switch
Regular price $523.89 USDRegular priceSale price $523.89 USD -
Greystone CDD4B101T7R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10,000 ohm type 3 thermistor and relay
Regular price $534.09 USDRegular priceSale price $534.09 USD -
Greystone CDD4B101T7 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 10,000 ohm type 3 thermistor
Regular price $518.75 USDRegular priceSale price $518.75 USD -
Greystone CDD4B101T6S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 3000 ohm thermistor and override switch
Regular price $522.08 USDRegular priceSale price $522.08 USD -
Greystone CDD4B101T6R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 3000 ohm thermistor and relay
Regular price $532.25 USDRegular priceSale price $532.25 USD -
Greystone CDD4B101T6 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 3000 ohm thermistor
Regular price $516.95 USDRegular priceSale price $516.95 USD -
Greystone CDD4B101T5S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 1800 ohm thermistor and override switch
Regular price $522.08 USDRegular priceSale price $522.08 USD -
Greystone CDD4B101T5R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 1800 ohm thermistor and relay
Regular price $532.25 USDRegular priceSale price $532.25 USD -
Greystone CDD4B101T5 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 1800 ohm thermistor
Regular price $516.95 USDRegular priceSale price $516.95 USD -
Greystone CDD4B101T2S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT100 ohm RTD and override switch
Regular price $526.37 USDRegular priceSale price $526.37 USD -
Greystone CDD4B101T2R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT100 ohm RTD and relay
Regular price $536.49 USDRegular priceSale price $536.49 USD -
Greystone CDD4B101T24S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10,000 ohm type 2 thermistor and override switch
Regular price $522.08 USDRegular priceSale price $522.08 USD -
Greystone CDD4B101T24R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10,000 ohm type 2 thermistor and relay
Regular price $532.25 USDRegular priceSale price $532.25 USD -
Greystone CDD4B101T24 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 10,000 ohm type 2 thermistor
Regular price $516.95 USDRegular priceSale price $516.95 USD -
Greystone CDD4B101T20S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 20,000 ohm thermistor and override switch
Regular price $522.08 USDRegular priceSale price $522.08 USD -
Greystone CDD4B101T20R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 20,000 ohm thermistor and relay
Regular price $532.25 USDRegular priceSale price $532.25 USD -
Greystone CDD4B101T20 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 20,000 ohm thermistor
Regular price $516.95 USDRegular priceSale price $516.95 USD -
Greystone CDD4B101T2 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and PT100 ohm RTD
Regular price $521.21 USDRegular priceSale price $521.21 USD -
Greystone CDD4B101T14S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10K ohm Thermistor+11K shunt resistor and override switch
Regular price $526.37 USDRegular priceSale price $526.37 USD -
Greystone CDD4B101T14R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, 10K ohm Thermistor+11K shunt resistor and relay
Regular price $536.49 USDRegular priceSale price $536.49 USD -
Greystone CDD4B101T14 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and 10K ohm Thermistor+11K shunt resistor
Regular price $521.21 USDRegular priceSale price $521.21 USD -
Greystone CDD4B101T13S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT1000 Nickel RTD and override switch
Regular price $526.37 USDRegular priceSale price $526.37 USD -
Greystone CDD4B101T13R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT1000 Nickel RTD and relay
Regular price $536.49 USDRegular priceSale price $536.49 USD -
Greystone CDD4B101T13 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and PT1000 Nickel RTD
Regular price $521.21 USDRegular priceSale price $521.21 USD -
Greystone CDD4B101T12S Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT1000 ohm RTD and override switch
Regular price $528.19 USDRegular priceSale price $528.19 USD -
Greystone CDD4B101T12R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display, PT1000 ohm RTD and relay
Regular price $538.35 USDRegular priceSale price $538.35 USD -
Greystone CDD4B101T12 Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and PT1000 ohm RTD
Regular price $523.01 USDRegular priceSale price $523.01 USD -
Greystone CDD4B101R Room, CO2, NDIR dual beam, c/w analog outputs, exposed LCD display and relay
Regular price $525.75 USDRegular priceSale price $525.75 USD -
Greystone CDD4B101 Room, CO2, NDIR dual beam, c/w analog outputs, and exposed LCD display
Regular price $510.41 USDRegular priceSale price $510.41 USD -
Greystone CDD4B100T8S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 2.252K Ohm thermistor and override switch
Regular price $513.63 USDRegular priceSale price $513.63 USD -
Greystone CDD4B100T8R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 2.252K Ohm thermistor and relay
Regular price $523.78 USDRegular priceSale price $523.78 USD -
Greystone CDD4B100T8 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 2.252K Ohm thermistor
Regular price $508.55 USDRegular priceSale price $508.55 USD -
Greystone CDD4B100T7S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10,000 ohm type 3 thermistor and override switch
Regular price $511.14 USDRegular priceSale price $511.14 USD -
Greystone CDD4B100T7R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10,000 ohm type 3 thermistor and relay
Regular price $521.30 USDRegular priceSale price $521.30 USD -
Greystone CDD4B100T7 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 10,000 ohm type 3 thermistor
Regular price $505.99 USDRegular priceSale price $505.99 USD -
Greystone CDD4B100T6S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 3000 ohm thermistor and override switch
Regular price $509.38 USDRegular priceSale price $509.38 USD -
Greystone CDD4B100T6R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 3000 ohm thermistor and relay
Regular price $519.50 USDRegular priceSale price $519.50 USD -
Greystone CDD4B100T6 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 3000 ohm thermistor
Regular price $504.26 USDRegular priceSale price $504.26 USD -
Greystone CDD4B100T5S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 1800 ohm thermistor and override switch
Regular price $509.38 USDRegular priceSale price $509.38 USD -
Greystone CDD4B100T5R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 1800 ohm thermistor and relay
Regular price $519.50 USDRegular priceSale price $519.50 USD -
Greystone CDD4B100T5 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 1800 ohm thermistor
Regular price $504.26 USDRegular priceSale price $504.26 USD -
Greystone CDD4B100T2S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT100 ohm RTD and override switch
Regular price $513.63 USDRegular priceSale price $513.63 USD -
Greystone CDD4B100T2R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT100 ohm RTD and relay
Regular price $523.78 USDRegular priceSale price $523.78 USD -
Greystone CDD4B100T24S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10,000 ohm type 2 thermistor and override switch
Regular price $509.38 USDRegular priceSale price $509.38 USD -
Greystone CDD4B100T24R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10,000 ohm type 2 thermistor and relay
Regular price $519.50 USDRegular priceSale price $519.50 USD -
Greystone CDD4B100T24 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 10,000 ohm type 2 thermistor
Regular price $504.26 USDRegular priceSale price $504.26 USD -
Greystone CDD4B100T20S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 20,000 ohm thermistor and override switch
Regular price $509.38 USDRegular priceSale price $509.38 USD -
Greystone CDD4B100T20R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 20,000 ohm thermistor and relay
Regular price $519.50 USDRegular priceSale price $519.50 USD -
Greystone CDD4B100T20 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 20,000 ohm thermistor
Regular price $504.26 USDRegular priceSale price $504.26 USD -
Greystone CDD4B100T2 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and PT100 ohm RTD
Regular price $508.55 USDRegular priceSale price $508.55 USD