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 CDD4B100T14S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10K ohm Thermistor+11K shunt resistor and override switch
Regular price $513.63 USDRegular priceSale price $513.63 USD -
Greystone CDD4B100T14R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, 10K ohm Thermistor+11K shunt resistor and relay
Regular price $523.78 USDRegular priceSale price $523.78 USD -
Greystone CDD4B100T14 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and 10K ohm Thermistor+11K shunt resistor
Regular price $508.55 USDRegular priceSale price $508.55 USD -
Greystone CDD4B100T13S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT1000 Nickel RTD and override switch
Regular price $513.63 USDRegular priceSale price $513.63 USD -
Greystone CDD4B100T13R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT1000 Nickel RTD and relay
Regular price $523.78 USDRegular priceSale price $523.78 USD -
Greystone CDD4B100T13 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and PT1000 Nickel RTD
Regular price $508.55 USDRegular priceSale price $508.55 USD -
Greystone CDD4B100T12S Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT1000 ohm RTD and override switch
Regular price $515.41 USDRegular priceSale price $515.41 USD -
Greystone CDD4B100T12R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display, PT1000 ohm RTD and relay
Regular price $525.60 USDRegular priceSale price $525.60 USD -
Greystone CDD4B100T12 Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and PT1000 ohm RTD
Regular price $510.30 USDRegular priceSale price $510.30 USD -
Greystone CDD4B100R Room, CO2, NDIR dual beam, c/w analog outputs, concealed LCD display and relay
Regular price $512.97 USDRegular priceSale price $512.97 USD -
Greystone CDD4B100 Room, CO2, NDIR dual beam, c/w analog outputs, and concealed LCD display
Regular price $497.63 USDRegular priceSale price $497.63 USD -
Greystone CDD5B101S Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD, Exposed push button momentary switch - N.O.
Regular price $426.19 USDRegular priceSale price $426.19 USD -
Greystone CDD5B101R Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD, Relay Output
Regular price $436.38 USDRegular priceSale price $436.38 USD -
Greystone CDD5B101PS Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD, Linear slide pot for set point control, Exposed push button momentary switch - N.O.
Regular price $431.33 USDRegular priceSale price $431.33 USD -
Greystone CDD5B101PR Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD, Linear slide pot for set point control, Relay Output
Regular price $441.52 USDRegular priceSale price $441.52 USD -
Greystone CDD5B101P Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD, Linear slide pot for set point control
Regular price $426.19 USDRegular priceSale price $426.19 USD -
Greystone CDD5B101 Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Viewable LCD
Regular price $421.12 USDRegular priceSale price $421.12 USD -
Greystone CDD5B100S Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD, Exposed push button momentary switch - N.O.
Regular price $413.44 USDRegular priceSale price $413.44 USD -
Greystone CDD5B100R Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD
Regular price $423.63 USDRegular priceSale price $423.63 USD -
Greystone CDD5B100PS Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD, Linear slide pot for set point control, Exposed push button momentary switch - N.O.
Regular price $418.53 USDRegular priceSale price $418.53 USD -
Greystone CDD5B100PR Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD, Linear slide pot for set point control, Relay Output
Regular price $428.74 USDRegular priceSale price $428.74 USD -
Greystone CDD5B100P Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD, Linear slide pot for set point control
Regular price $413.44 USDRegular priceSale price $413.44 USD -
Greystone CDD5B100 Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 0-5 or 0-10 Vdc, Concealed LCD
Regular price $408.33 USDRegular priceSale price $408.33 USD -
Greystone CDD5A101S Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD, Exposed push button momentary switch - N.O.
Regular price $426.19 USDRegular priceSale price $426.19 USD -
Greystone CDD5A101R Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD, Relay Output
Regular price $436.38 USDRegular priceSale price $436.38 USD -
Greystone CDD5A101PS Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD, Linear slide pot for set point control, Exposed push button momentary switch - N.O.
Regular price $431.33 USDRegular priceSale price $431.33 USD -
Greystone CDD5A101PR Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD, Linear slide pot for set point control, Relay Output
Regular price $441.52 USDRegular priceSale price $441.52 USD -
Greystone CDD5A101P Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD, Linear slide pot for set point control
Regular price $426.19 USDRegular priceSale price $426.19 USD -
Greystone CDD5A101 Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Viewable LCD
Regular price $421.12 USDRegular priceSale price $421.12 USD -
Greystone CDD5A100S Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD
Regular price $413.44 USDRegular priceSale price $413.44 USD -
Greystone CDD5A100R Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD
Regular price $423.63 USDRegular priceSale price $423.63 USD -
Greystone CDD5A100PS Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD, Linear slide pot for set point control
Regular price $418.53 USDRegular priceSale price $418.53 USD -
Greystone CDD5A100PR Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD, Linear slide pot for set point control, Relay Output
Regular price $428.74 USDRegular priceSale price $428.74 USD -
Greystone CDD5A100P Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD
Regular price $413.44 USDRegular priceSale price $413.44 USD -
Greystone CDD5A100 Room Carbon Dioxide Detector, 0-2000 ppm, Temperature & Humidity, 4-20 mA, Concealed LCD
Regular price $408.33 USDRegular priceSale price $408.33 USD -
Greystone CMD5B5110-MOD Duct Carbon Monoxide Detector, two Form C relays, Modbus communications, LCD and test switch
Regular price $399.34 USDRegular priceSale price $399.34 USD -
Greystone CMD5B5110-BAC Duct Carbon Monoxide Detector, two Form C relays, BACnet communications, LCD and test switch
Regular price $399.34 USDRegular priceSale price $399.34 USD -
Greystone CMD5B5110 Duct Carbon Monoxide Detector, two Form C relays, LCD and test switch
Regular price $335.76 USDRegular priceSale price $335.76 USD -
Greystone CMD5B5100-MOD Duct Carbon Monoxide Detector, one Form C relay, Modbus communications, LCD and test switch
Regular price $384.04 USDRegular priceSale price $384.04 USD -
Greystone CMD5B5100-BAC Duct Carbon Monoxide Detector, one Form C relay, BACnet communications, LCD and test switch
Regular price $384.04 USDRegular priceSale price $384.04 USD -
Greystone CMD5B5100 Duct Carbon Monoxide Detector, one Form C relay, LCD and test switch
Regular price $320.52 USDRegular priceSale price $320.52 USD -
Greystone CMD5B5000-MOD Duct Carbon Monoxide Detector, Modbus communications, LCD and test switch
Regular price $368.76 USDRegular priceSale price $368.76 USD -
Greystone CMD5B5000-BAC Duct Carbon Monoxide Detector, BACnet communications, LCD and test switch
Regular price $368.76 USDRegular priceSale price $368.76 USD -
Greystone CMD5B5000 Duct Carbon Monoxide Detector, LCD and test switch
Regular price $305.24 USDRegular priceSale price $305.24 USD -
Greystone CMD5B1100 Wall/Surface-Mount Carbon Monoxide Detector, 0-300 ppm range, 4-20 mA output, Form C alarm relay
Regular price $206.08 USDRegular priceSale price $206.08 USD -
Greystone CMD5B1000-010 Wall/Surface-Mount Carbon Monoxide Detector, 0-300 ppm range, 0-10 Vdc output
Regular price $188.04 USDRegular priceSale price $188.04 USD -
Greystone CMD5B1000 Wall/Surface-Mount Carbon Monoxide Detector, 0-300 ppm range, 4-20 mA output
Regular price $190.80 USDRegular priceSale price $190.80 USD -
Greystone RH110B05C1A2 5% designer humidity & temp transmitter, 24 Vdc supply, 4-20mA output and 0-50C(32-122F) temperature range.
Regular price $182.93 USDRegular priceSale price $182.93 USD -
Greystone RH110B05C1A1 5% designer humidity & temp transmitter, 24 Vdc supply, 4-20mA output and 0-35C(32-95F) temperature range.
Regular price $182.93 USDRegular priceSale price $182.93 USD -
Greystone RH110B03C1A2 3% designer humidity & temp transmitter, 24 Vdc supply, 4-20mA output and 0-50C(32-122F) temperature range.
Regular price $235.23 USDRegular priceSale price $235.23 USD