{"id":17215,"date":"2026-10-29T09:19:22","date_gmt":"2026-10-29T08:19:22","guid":{"rendered":"https:\/\/ventsystems.de\/lexikon\/co2-sensor\/"},"modified":"2026-10-29T09:19:22","modified_gmt":"2026-10-29T08:19:22","slug":"co2-sensor","status":"publish","type":"page","link":"https:\/\/ventsystems.de\/en\/lexikon\/co2-sensor\/","title":{"rendered":"CO\u2082 sensor"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A <strong>CO\u2082 sensor<\/strong> measures the carbon dioxide content of the indoor air in <strong>ppm<\/strong> (parts per million). If the value rises, the air is stale \u2013 a good reason to ventilate automatically.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Guide values<\/h2>\n\n\n<ul class=\"wp-block-list\"><li>Outdoor air: around 400 ppm<\/li><li>up to 1,000 ppm: good indoor air (the so-called Pettenkofer value)<\/li><li>1,000 to 2,000 ppm: ventilation recommended<\/li><li>above 2,000 ppm: inadequate air quality<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">CO\u2082 sensor and window actuator<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Combined with a suitable ventilation control, the window opens when the air is poor and closes again once the value has dropped. Whether a control has a sensor input is stated in the data sheet. Wind and rain sensors ensure that it still closes in bad weather.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n<h3 class=\"wp-block-heading\">Where does CO\u2082-controlled ventilation make sense?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">In rooms with many people: classrooms, meeting rooms, offices, nurseries.<\/p>\n\n\n<h3 class=\"wp-block-heading\">Do I need a building management system for this?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Not necessarily. There are ventilation controls with sensor inputs. For larger buildings, integration into the building management system is an option \u2013 with the i-series actuators, for example, via Modbus.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Read more<\/h2>\n\n\n<ul class=\"wp-block-list\"><li><a href=\"\/en\/dictionary\/ventilation-control\/\">Glossary: Ventilation control<\/a><\/li><li><a href=\"\/en\/dictionary\/rain-sensor\/\">Glossary: Rain sensor<\/a><\/li><li><a href=\"\/en\/integrating-window-drives-into-building-management-systems\/\">Guide: Integrating window actuators into building management<\/a><\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">Not sure which actuator fits? Call us at <a href=\"tel:+494050694631\">040 50694631<\/a> (Mon\u2013Fri 8 am\u20135 pm) or use the <a href=\"\/en\/drive-finder\/\">actuator finder<\/a>.<\/p>\n\n\n<p class=\"wp-block-paragraph\"><a href=\"\/en\/dictionary\/\">\u2190 Back to the glossary<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>How a CO\u2082 sensor can control window ventilation according to air quality.<\/p>","protected":false},"author":9,"featured_media":0,"parent":16230,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-17215","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/17215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/comments?post=17215"}],"version-history":[{"count":0,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/17215\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/pages\/16230"}],"wp:attachment":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/media?parent=17215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}