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Thermokon SR04 CO2 Room Sensor – Temperature & CO2

SR04 CO2 Room Sensor – Temperature & CO2

  • Temperature Sensor
  • CO2 Sensor
  • Available with or without LCD display
  • Available with 3 LEDs showing levels of CO2 concentration



Radio room sensor for measuring CO2 content, temperature and relative humidity (optionally) in living and office spaces. The device to be mounted via adhesive pad or screws sends its measured values unidirectionally to corresponding receivers or gateways, which process the information directly or – depending on the application – forward it to a central control unit.


SR04_CO2_EasySens_Datasheet_en (601KB)


Measuring valuesCO2, temperature, humidity, depending on the device
Radio technologyEnOcean (IEC 14543-3-10)
Frequency868 MHz, optional:, 902 MHz (Americas)
Power supply15..24 V = (±10%) or 24 V ~ (±10%) SELV
Power consumptionmax. 1,5 W (24 V =) | 3,6 VA (24 V ~)
Measuring range temp.0..+51 °C
Measuring range humidity0..100% rH non-condensing
Measuring range CO20..2550 ppm
Accuracy temperature±1% of measuring range (typ. at 21 °C)
Accuracy humidity±3% between 20..80% rH (typ. at 21 °C)
Accuracy CO2±75 ppm, >750 ppm: ±10% (typ. at 21 °C, 1015 hPa)
Measuring intervalWakeUp time = 100 sec. (default)
Calibrationself-calibration, Dual Channel
DisplayLCD 29×12 mm, monochrome, optional, 3 LEDs indicating air quality (CO2, traffic light function ‘TLF’), optional
EnclosurePC, pure white
ProtectionIP30 according to EN 60529
Cable entrybreaking points top/bottom, rear entry
Connection electricalterminal block, max. 1,5 mm²
Ambient condition0..+50 °C, max. 85% rH non-condensing
Weight90 g
Mountingsurface mounted on flush-mounting box (Ø=60 mm), screw mounted onto flat surface
Notesoptional with display “LCD”, optional with traffic light function “TLF”

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