ABB Stotz S&J Air Quality Sensor with Room Temperature Controller LGS/A1.2 2CDG120059R0011

Experience precise indoor climate management with the ABB Stotz S&J Air Quality Sensor LGS/A1.2, engineered to monitor CO2, VOC, temperature, and humidity while integrating a room temperature controller on the KNX bus. Its CO2 measurement accuracy of ±50 ppm + 3% ensures reliable ventilation control for healthy and productive spaces.

Overview

The LGS/A1.2 is a flush-mounted KNX sensor designed for wall installation in standard boxes. It continuously measures carbon dioxide (0–2000 ppm), volatile organic compounds (relative air quality index), temperature (0–50 °C), and relative humidity (0–100% RH). With an integrated room temperature controller (RTR), it can directly manage heating or cooling actuators based on the measured values, optimizing comfort and energy efficiency.

What stands out

• Multi-parameter sensing: CO2, VOC, temperature, and humidity in one compact device.
• Integrated room temperature controller for direct HVAC control via KNX.
• High accuracy: CO2 ±50 ppm + 3% of reading, temperature ±0.5 K, humidity ±3% RH.
• Flush-mounted design fits standard wall boxes, blending seamlessly into any interior.
• Powered directly from the KNX bus (21–30 V DC), no external supply needed.
• Studio white thermoplastic housing for a clean, modern look.

Technical details

• Sensor types: CO2, VOC, temperature, humidity
• CO2 measurement range: 0–2000 ppm
• CO2 accuracy: ±50 ppm + 3% of measured value
• Temperature measurement range: 0–50 °C
• Temperature accuracy: ±0.5 K
• Humidity measurement range: 0–100% RH
• Humidity accuracy: ±3% RH
• Communication: KNX bus (TP)
• Power supply: KNX bus, 21–30 V DC
• Bus current consumption: max. 10 mA
• Mounting: flush-mounted in standard wall box
• Protection class: IP20
• Operating temperature: 0 °C to +45 °C
• Storage temperature: -25 °C to +70 °C
• Housing material: thermoplastic
• Colour: studio white
• Display: none
• ETS product family: Sensors / Air Quality

Our verdict

The ABB LGS/A1.2 is a versatile and accurate air quality sensor with integrated room temperature control, ideal for KNX smart buildings. Its multi-sensor capability and bus-powered design simplify installation while delivering reliable data for demand-controlled ventilation and climate management.