Temperature sensor, humidity sensor, CO₂ sensor, surface-mounted

Information

Datasheet

SK20-THC-CO2-2B KNX Surface-Mounted Sensor for Indoor Air Quality

The SK20-THC-CO2-2B by Arcus-EDS is a versatile KNX sensor for surface mounting, designed to measure and control indoor air parameters such as temperature, relative humidity, and CO₂ concentration. This compact device provides accurate readings and calculates absolute humidity, dew point, and enthalpy. With advanced HVAC control functions, it is ideal for ventilation management, energy efficiency, and climate regulation in KNX-based building automation systems.

Availability:

• Article number: 30532261
• EAN code: 642125990905

Applications:

• Monitoring and control of room temperature
• Detection of CO₂ concentration in indoor air
• Decentralized control of KNX valves or thermal actuators
• Automatic ventilation control based on air quality
• Switching functions via external push buttons or switches

Features and functions:

• Sensors for temperature, humidity, and CO₂ integrated in the housing
• Calculated values: absolute humidity, dew point, enthalpy
• Control for heating and cooling (combinable)
• Setpoint temperatures for Comfort, Standby, Economy, and Protection via KNX objects
• Setpoint adjustment via KNX communication
• Storage of minimum and maximum temperatures
• Heat and frost alarm
• Configurable limits for temperature and humidity
• Fan control based on humidity thresholds and external inputs
• Dew point monitoring with alarm and control in case of condensation risk
• Controller output 0–100% or PWM (programmable) for thermal actuators
• Valve rinsing function
• Secondary temperature controller available as auxiliary control
• 2 potential-free binary inputs
• 4 logic blocks for linking internal and external signals

Technical specifications:

• Measured values: Temperature, Relative Humidity, CO₂ concentration
• Calculated values: Absolute Humidity, Dew Point, Enthalpy
• Control: Integrated
• Temperature range: -10 to +50 °C
• Temperature resolution: 0.02 °C
• Temperature accuracy: ±0.4 °C (5–60 °C), otherwise ±0.8 °C
• Humidity range: 0–95% RH, resolution 0.02%, accuracy ±3% (20–80%)
• CO₂ measurement range: 400–5000 ppm
• CO₂ accuracy: ±(50 ppm + 3% of measured value)
• Binary inputs: 2 (potential-free)
• Operating voltage: KNX bus 21–32 VDC
• Power consumption: approx. 240 mW at 24 VDC
• Ambient temperature: -10 to +50 °C (operation), -25 to +60 °C (storage)
• Ambient humidity: 0–95% RH (non-condensing)
• Auxiliary supply: Not required
• Bus coupler: Integrated
• ETS compatibility: From version 4 (HLK305)
• Connection: KNX 2-pole terminal (red/black)
• Protection class: IP20
• Housing: Plastic, white
• Dimensions: 71 x 71 x 25 mm

Important note:

This is a surface-mounted sensor with integrated measuring elements. No external power supply is required. The device is designed for direct integration into KNX systems without additional sensors or modules.