Collection: Indoor Air Quality (IAQ) and Combo Sensors

Indoor Air Quality (IAQ) affects health and productivity, with pollutants like mold and VOCs causing issues, while good ventilation improves well-being, and sensors help manage these conditions by signaling systems to adjust for cleaner air, reducing headaches and fatigue. Combo Sensors measure room levels of varying conditions. Many models include temperature and relative humidity, while others incorporate these with air quality sensors for gases (CO2, CO, NO2) and/or particulate matter.

Greystone HTRC3NI Room Humidity/ Temperature Transmitter, 3%, Concealed LCD, 4-20 mA output

Greystone HTRC3NI Room Humidity/ Temperature Transmitter, 3%, Concealed LCD, 4-20 mA output

Regular price $236.04 USD

Regular price Sale price $236.04 USD
Greystone HTRC3LVS Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Greystone HTRC3LVS Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Regular price $267.52 USD

Regular price Sale price $267.52 USD
Greystone HTRC3LV Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Greystone HTRC3LV Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Regular price $262.20 USD

Regular price Sale price $262.20 USD
Greystone HTRC3LIS Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 4-20 mA output, Override switch (Includes OCC input)

Greystone HTRC3LIS Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 4-20 mA output, Override switch (Includes OCC input)

Regular price $267.52 USD

Regular price Sale price $267.52 USD
Greystone HTRC3LI Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 4-20 mA output

Greystone HTRC3LI Room Humidity/ Temperature Transmitter, 3%, Viewable LCD, 4-20 mA output

Regular price $262.20 USD

Regular price Sale price $262.20 USD
Greystone HTRC2NVS Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Greystone HTRC2NVS Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Regular price $267.52 USD

Regular price Sale price $267.52 USD
Greystone HTRC2NV Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Greystone HTRC2NV Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Regular price $262.20 USD

Regular price Sale price $262.20 USD
Greystone HTRC2NIS Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 4-20 mA output, Override switch (Includes OCC input)

Greystone HTRC2NIS Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 4-20 mA output, Override switch (Includes OCC input)

Regular price $267.52 USD

Regular price Sale price $267.52 USD
Greystone HTRC2NI Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 4-20 mA output

Greystone HTRC2NI Room Humidity/ Temperature Transmitter, 2%, Concealed LCD, 4-20 mA output

Regular price $262.20 USD

Regular price Sale price $262.20 USD
Greystone HTRC2LVS Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Greystone HTRC2LVS Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable, Override switch (Includes OCC input)

Regular price $293.67 USD

Regular price Sale price $293.67 USD
Greystone HTRC2LV Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Greystone HTRC2LV Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Jumper selectable

Regular price $288.44 USD

Regular price Sale price $288.44 USD
Greystone HTRC2LIS Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 4-20 mA output, Override switch (Includes OCC input)

Greystone HTRC2LIS Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 4-20 mA output, Override switch (Includes OCC input)

Regular price $293.67 USD

Regular price Sale price $293.67 USD
Greystone HTRC2LI Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 4-20 mA output

Greystone HTRC2LI Room Humidity/ Temperature Transmitter, 2%, Viewable LCD, 4-20 mA output

Regular price $288.44 USD

Regular price Sale price $288.44 USD
Greystone CD2RMCVXXXXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, No temperature sensor, No relay, No override, No setpoint

Greystone CD2RMCVXXXXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, No temperature sensor, No relay, No override, No setpoint

Regular price $318.97 USD

Regular price Sale price $318.97 USD
Greystone CD2RMCVXXRXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, No temperature sensor, Adjustable relay, No override, No setpoint

Greystone CD2RMCVXXRXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, No temperature sensor, Adjustable relay, No override, No setpoint

Regular price $334.30 USD

Regular price Sale price $334.30 USD
Greystone CD2RMCV24XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV24XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $327.38 USD

Regular price Sale price $327.38 USD
Greystone CD2RMCV24XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV24XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV24XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV24XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV24RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Greystone CD2RMCV24RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Regular price $342.72 USD

Regular price Sale price $342.72 USD
Greystone CD2RMCV20XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV20XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $327.38 USD

Regular price Sale price $327.38 USD
Greystone CD2RMCV20XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV20XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV20XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV20XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV20RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Greystone CD2RMCV20RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 20,000 Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Regular price $342.72 USD

Regular price Sale price $342.72 USD
Greystone CD2RMCV14XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, No override, No setpoint

Greystone CD2RMCV14XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, No override, No setpoint

Regular price $331.68 USD

Regular price Sale price $331.68 USD
Greystone CD2RMCV14XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV14XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, No override, 0 - 10,000 ohms

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV14XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, Override switch, No setpoint

Greystone CD2RMCV14XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, No relay, Override switch, No setpoint

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV14RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, Adjustable relay, No override, No setpoint

Greystone CD2RMCV14RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistor, Adjustable relay, No override, No setpoint

Regular price $347.01 USD

Regular price Sale price $347.01 USD
Greystone CD2RMCV13XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, No override, No setpoint

Greystone CD2RMCV13XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, No override, No setpoint

Regular price $331.68 USD

Regular price Sale price $331.68 USD
Greystone CD2RMCV13XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV13XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, No override, 0 - 10,000 ohms

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV13XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, Override switch, No setpoint

Greystone CD2RMCV13XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, No relay, Override switch, No setpoint

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV13RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, Adjustable relay, No override, No setpoint

Greystone CD2RMCV13RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Nickel, Class B, DIN 43760, Adjustable relay, No override, No setpoint

Regular price $347.01 USD

Regular price Sale price $347.01 USD
Greystone CD2RMCV12XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, No override, No setpoint

Greystone CD2RMCV12XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, No override, No setpoint

Regular price $331.68 USD

Regular price Sale price $331.68 USD
Greystone CD2RMCV12XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV12XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, No override, 0 - 10,000 ohms

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV12XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, Override switch, No setpoint

Greystone CD2RMCV12XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, No relay, Override switch, No setpoint

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV12RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, Adjustable relay, No override, No setpoint

Greystone CD2RMCV12RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin film, Adjustable relay, No override, No setpoint

Regular price $347.01 USD

Regular price Sale price $347.01 USD
Greystone CD2RMCV08XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV08XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $331.68 USD

Regular price Sale price $331.68 USD
Greystone CD2RMCV08XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV08XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV08XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV08XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $336.74 USD

Regular price Sale price $336.74 USD
Greystone CD2RMCV08RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Greystone CD2RMCV08RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 2.252K Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Regular price $347.01 USD

Regular price Sale price $347.01 USD
Greystone CD2RMCV07XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV07XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $327.38 USD

Regular price Sale price $327.38 USD
Greystone CD2RMCV07XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV07XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV07XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV07XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV07RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Greystone CD2RMCV07RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Regular price $342.72 USD

Regular price Sale price $342.72 USD
Greystone CD2RMCV06XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV06XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $327.38 USD

Regular price Sale price $327.38 USD
Greystone CD2RMCV06XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV06XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV06XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV06XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV06RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Greystone CD2RMCV06RXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 3000 Ohm, NTC Thermistor, ±0.2 C, Adjustable relay, No override, No setpoint

Regular price $342.72 USD

Regular price Sale price $342.72 USD
Greystone CD2RMCV05XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Greystone CD2RMCV05XXXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, No setpoint

Regular price $327.38 USD

Regular price Sale price $327.38 USD
Greystone CD2RMCV05XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Greystone CD2RMCV05XXP00 Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, No override, 0 - 10,000 ohms

Regular price $332.51 USD

Regular price Sale price $332.51 USD
Greystone CD2RMCV05XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Greystone CD2RMCV05XSXXX Room CO2 Sensor, 0-2,000 ppm, Viewable LCD, 1801 Ohm, NTC Thermistor, ±0.2 C, No relay, Override switch, No setpoint

Regular price $332.51 USD

Regular price Sale price $332.51 USD

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Collection: Indoor Air Quality (IAQ) and Combo Sensors

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