Greystone AIR4100 Room Air Quality Transmitter


(GST 18% Exclusive)

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Greystone AIR4100 Room Air Quality Transmitter is a device used to identify bad air quality. The AIR4100 Air Quality Sensor makes use of a cutting-edge MEMS metal oxide semiconductor sensor. The sensor responds swiftly to a wide variety of VOCs, including smoke, culinary aromas, bio-effluence, external contaminants, and from human activities. All VOC emissions that are entirely undetectable by CO2 sensors are captured by the sensor. The Air Quality Sensor has been calibrated to offer a “CO2-equivalent” ppm measurement value, enabling full compliance to existing HVAC CO2 ventilation regulations. Extensive studies and research have demonstrated that there is a direct association between CO2 levels and VOC levels.

Applications: Paint Booth, Confined Space Entry, Hazmat/Homeland Security, Industrial Hygiene and Confined Space, Airlines (wing-tank passage), Landfills, Oil and Gas, Chemical Plants, Hotels, Schools, Ambient Workplace, Indoor Air Quality Monitoring, Hospitals.

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Greystone AIR4100 Room Air Quality Transmitter Provides an output of 0-5 or 0-10 Vdc linear analog signal output for connecting to a building automation system as well as analog 0-10Vdc output that is stepped. There are add-on features available, including a temperature sensor, manual override, and adjustable relay output.

Features of Room Air Quality Monitor:

  • Direct correlation to CO2 levels
  • High sensitivity and fast response
  • Stable long-term operation
  • 0 to 2000 ppm CO2 equivalent output signal
  • LCD to display air quality information
  • Internal menu for easy setup
  • Analog stepped output for damper control
  • Linear output for logging and control
  • Tri-color LED to indicate IAQ level

Additional information

Weight 1 kg


Model No


Sensor Type

MEMS metal oxide semiconductor VOC sensor

Measurable Range

450-2000 ppm CO2 equivalent or 0-100% (menu selectable)

Power Supply

20-28 Vac/dc (non-isolated half-wave rectified)

Current consumption

35 mA max @ 24 Vdc

Operating Temperature

0 to 50°C (32 to 122°F)

Operating Humidity

15-95% RH non-condensing

Warm-up Time

5 minutes

LCD Display

35mm W x 15mm H x (1.4” x 0.6”) alpha-numeric 2 line x 8 characters

LED Indicator

Tri-color (Good = Green, Fair = Blue, Poor = Red), enable or disable via menu


84mm W x 119mm H x 29mm D (3.3” x 4.7” x 1.15”)


122 gm

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Greystone AIR4100 Room Air Quality Transmitter

Greystone AIR4100 Room Air Quality Transmitter


(GST 18% Exclusive)

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