{"product_id":"arcus-sk20-tthc-co2-2b","title":"SK20-TTHC-CO2-2B - KNX Temperature, Humidity and CO2 Sensor with PT1000 Input, 2 Binary Inputs","description":"\u003cp\u003eThe SK20-TTHC-CO2-2B is a KNX room sensor that measures temperature, humidity and CO2 and includes an integrated room temperature controller (RTR). It is a practical choice for demand-controlled ventilation in offices, meeting rooms and classrooms. Absolute humidity, dew point and enthalpy are calculated on board. An extra input for an external PT1000 probe adds a second temperature measurement from -50 to +400 °C (-58 to 752 °F).\u003c\/p\u003e\u003cp\u003eThe complete white plastic unit measures 71 x 71 x 25 mm (2.8 x 2.8 x 0.98 in) and flush-mounts on a standard in-wall box. Two binary inputs accept local contacts, and the sensor runs on KNX bus power with no auxiliary supply.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTemperature -10 to +50 °C (14 to 122 °F), resolution 0.02 °C (0.04 °F), accuracy ±0.4 °C (±0.72 °F) (5 to 60 °C (41 to 140 °F)), else ±0.8 °C (±1.4 °F)\u003c\/li\u003e\n\u003cli\u003eRelative humidity 0 to 95 %, accuracy ±3 % (20 to 80 %); calculates absolute humidity, dew point and enthalpy\u003c\/li\u003e\n\u003cli\u003eCO2 400 to 5000 ppm, accuracy ±(50 ppm + 5 % of reading)\u003c\/li\u003e\n\u003cli\u003eExternal PT1000 input for a second temperature, -50 to +400 °C (-58 to 752 °F) (probe not included)\u003c\/li\u003e\n\u003cli\u003e2 binary inputs\u003c\/li\u003e\n\u003cli\u003eWhite plastic housing 71 x 71 x 25 mm (2.8 x 2.8 x 0.98 in), flush mount on standard in-wall box, IP20\u003c\/li\u003e\n\u003cli\u003eIntegrated bus coupler and RTR; bus powered, no auxiliary supply; ETS application HLK305\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eArticle no.\u003c\/th\u003e\n\u003ctd\u003e30542261\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKNX bus voltage\u003c\/th\u003e\n\u003ctd\u003eKNX 21-32 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower consumption\u003c\/th\u003e\n\u003ctd\u003eapprox. 240 mW at 24 VDC (bus powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAuxiliary supply\u003c\/th\u003e\n\u003ctd\u003eNot required (bus powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasuring\u003c\/th\u003e\n\u003ctd\u003eTemperature -10..+50 °C (14 to 122 °F), res. 0.02 °C (0.04 °F), ±0.4 °C (±0.72 °F) (5..60 °C (41 to 140 °F)) else ±0.8 °C (±1.4 °F); humidity 0..95 % rH, res. 0.02 %, ±3 % rH (20..80 %) else ±5 %; CO2 400..5000 ppm, accuracy ±(50 ppm + 5 % of reading); calculates abs. humidity, dew point, enthalpy; 2nd temperature: external PT1000 input -50..+400 °C (-58 to 752 °F) (accuracy depends on probe; probe not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs \/ outputs \u0026amp; connections\u003c\/th\u003e\n\u003ctd\u003e2 binary inputs; external PT1000 input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProtection rating\u003c\/th\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e71 x 71 x 25 mm (2.8 x 2.8 x 0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eFlush mount on standard in-wall box, indoor (complete white plastic unit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating temperature\u003c\/th\u003e\n\u003ctd\u003e-10 to +50 °C (14 to 122 °F) (storage -25 to +60 °C (-13 to 140 °F)); 0..95 % rH non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eApplication note:\u003c\/strong\u003e The PT1000 probe for the second temperature input is not included and is ordered separately.\u003c\/p\u003e\u003ch3\u003eDownloads\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.arcus-eds.de\/fileadmin\/download.arcus-eds.de\/2000_HLK\/2750_CO2_SK20\/2752_01_e4_SK20-TTHC-CO2-2B.pdf\" target=\"_blank\" rel=\"noopener\"\u003eProduct datasheet\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.arcus-eds.de\/fileadmin\/download.arcus-eds.de\/2000_HLK\/2000_HLK305_APP\/2000_e3_APB_HLK305.pdf\" target=\"_blank\" rel=\"noopener\"\u003eApplication manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.arcus-eds.de\/fileadmin\/download.arcus-eds.de\/2000_HLK\/2000_HLK305_APP\/HLK305_v10.zip\" target=\"_blank\" rel=\"noopener\"\u003eETS application\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e(CE certified; not UL\/NRTL listed — verify local code requirements before specifying in US installations)\u003c\/em\u003e\u003c\/p\u003e","brand":"ARCUS EDS","offers":[{"title":"Default Title","offer_id":50554320322816,"sku":"30542261","price":380.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/4161\/5360\/files\/2752_SK20-TTHC-CO2-2B.png?v=1791427889","url":"https:\/\/www.knxsupply.com\/products\/arcus-sk20-tthc-co2-2b","provider":"KNX Supply","version":"1.0","type":"link"}