{"id":41637,"date":"2022-12-22T17:09:07","date_gmt":"2022-12-22T15:09:07","guid":{"rendered":"https:\/\/www.nordtec.se\/measurement-facts-and-theory\/facts-about-air-speed\/"},"modified":"2025-11-12T12:22:13","modified_gmt":"2025-11-12T10:22:13","slug":"facts-about-air-speed","status":"publish","type":"page","link":"https:\/\/www.nordtec.se\/en\/measurement-facts-and-theory\/facts-about-air-speed\/","title":{"rendered":"Facts about air speed"},"content":{"rendered":"\n<div class=\"wp-block-stackable-subtitle stk-block-subtitle stk-block stk-2a53052 topptitel-kalibrering\" data-block-id=\"2a53052\"><style>.stk-2a53052 {max-width:900px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><p class=\"stk-block-subtitle__text stk-subtitle has-text-align-center\"><span style=\"color: #00d084;\" class=\"stk-highlight\">AIR SPEED<\/span> FACTS<\/p><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-3fe0381\" data-block-id=\"3fe0381\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-3fe0381-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-f79b30b\" data-v=\"4\" data-block-id=\"f79b30b\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-f79b30b-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-f79b30b-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-d067bf6 fet-stor-rubrik\" id=\"fakta-om-lufthastighet-luftflode\" data-block-id=\"d067bf6\"><style>.stk-d067bf6 {max-width:900px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text has-text-align-center stk-block-heading--use-theme-margins\">Facts about air velocity \/ air flow<\/h2><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-65f4fbe\" data-block-id=\"65f4fbe\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-65f4fbe-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-e263332\" data-v=\"4\" data-block-id=\"e263332\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-e263332-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-e263332-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-c8e87d4\" data-block-id=\"c8e87d4\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-c8e87d4-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-b591531\" data-v=\"4\" data-block-id=\"b591531\"><style>.stk-b591531-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-b591531-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-b591531-inner-blocks\">\n<p class=\"has-text-align-center ingress\">About air velocity, air flow, supply and extract air, sensors for different types of measurements and practical tips on how to measure in ducts, over diffusers and grilles and make reference diffuser measurements.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"427\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px.jpg\" alt=\"\" class=\"wp-image-28332\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px.jpg 1000w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px-300x128.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px-768x328.jpg 768w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px-416x178.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/knowledgebase_measuring-parameter_Stromung_1000x427px-64x27.jpg 64w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n\n\n\n<p><strong>Air velocity<\/strong> is the speed of the air over a fixed point, e.g., the ground. a sensor. Usually expressed in m\/s (although the instruments are often referred to as air flow meters, as it is almost always the air flow that you want to measure).<\/p>\n\n\n\n<p><strong>Airflow <\/strong>is a defined amount of air (volume) passing a given point during a certain period of time and is usually expressed in l\/s or m\u00b3\/h.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<p><\/p>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-1884b43\" id=\"givare-for-matning-av-lufthastighet\" data-block-id=\"1884b43\"><style>.stk-1884b43 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Sensor for measuring air speed.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-18801b0\" id=\"varmtradsgivare\" data-block-id=\"18801b0\"><style>.stk-18801b0 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h3 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Hot wire sensors.<\/h3><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-dd9f494\" data-block-id=\"dd9f494\"><style>.stk-dd9f494 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-dd9f494-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-c14cc34\" data-v=\"4\" data-block-id=\"c14cc34\"><style>.stk-c14cc34-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-c14cc34-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-c14cc34-inner-blocks\">\n<p>The principle of hot wire sensors is based on a heated element, from which heat is dissipated by a cooler airflow.<\/p>\n\n\n\n<p>The temperature is kept constant via a control circuit. The control current is directly proportional to the air speed.<\/p>\n\n\n\n<p>When hot wire sensors are used in turbulent flows, the heated element is affected from several directions, which can affect the measurement result.<\/p>\n\n\n\n<p>This can largely be avoided by ensuring that there is a sufficiently long straight section of a channel before and after the measurement point.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-f68ba0f\" data-v=\"4\" data-block-id=\"f68ba0f\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-f68ba0f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-f68ba0f-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"492\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar.jpg\" alt=\"Air speed sensors and air supply arrows\" class=\"wp-image-27493\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar.jpg 800w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar-300x185.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar-768x472.jpg 768w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar-416x256.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/givare_och_luftflodespilar-64x39.jpg 64w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-9361748 avdelare\" data-block-id=\"9361748\"><style>.stk-9361748 hr.stk-block-divider__hr{width:100% !important;}.stk-9361748 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-5037e96\" id=\"pitotror-prandtlror\" data-block-id=\"5037e96\"><style>.stk-5037e96 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Pitot tube (prandtl tube).<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-1a7ac15\" data-block-id=\"1a7ac15\"><style>.stk-1a7ac15 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-1a7ac15-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-b691fcd\" data-v=\"4\" data-block-id=\"b691fcd\"><style>.stk-b691fcd-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-b691fcd-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-b691fcd-inner-blocks\">\n<p>The front opening of the pitot tube is subjected to the total pressure (dynamic + static pressure) in a channel and leads it to point (a) which is connected to the plus nipple of a diff-pressure measuring instrument or sensor.<\/p>\n\n\n\n<p>The static pressure is received through the side openings of the pitot tube and is conducted to point (b) which is connected to the negative nipple of the instrument. The resulting diff pressure is directly proportional to the air velocity in a duct and is converted according to the formula below.<\/p>\n\n\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-6588aaf\" data-block-id=\"6588aaf\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-6588aaf-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-a50d102\" data-v=\"4\" data-block-id=\"a50d102\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-a50d102-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-a50d102-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotrors-formel_300px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"130\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotrors-formel_300px.jpg\" alt=\"Air speed pitot tube formula\" class=\"wp-image-27496\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotrors-formel_300px.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotrors-formel_300px-64x28.jpg 64w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-3590ac0\" data-v=\"4\" data-block-id=\"3590ac0\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-3590ac0-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-3590ac0-inner-blocks\">\n<p>v = Air velocity in m\/s<br\/>s = Pitot tube factor<br\/>r = Air density in kg\/m3<br\/>p = Differential pressure in Pascal<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<p><strong>ATTENTION!<\/strong>  Air density is normally quite unaffected by humidity and absolute pressure. However, the temperature can have a significant impact if it is very different from the room temperature.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-62bd36a\" data-v=\"4\" data-block-id=\"62bd36a\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-62bd36a-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-62bd36a-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"800\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px.jpg\" alt=\"Air speed pitot tube pressure\" class=\"wp-image-27495\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px-225x300.jpg 225w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px-416x555.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/pitotror_text_600px-64x85.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-e7ce8f9 avdelare\" id=\"pitotror-prandtlror\" data-block-id=\"e7ce8f9\"><style>.stk-e7ce8f9 hr.stk-block-divider__hr{width:100% !important;}.stk-e7ce8f9 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-6c8ba95\" id=\"vinghjulsgivare\" data-block-id=\"6c8ba95\"><style>.stk-6c8ba95 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Flywheel sensors.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-8a9c53a\" id=\"pitotror-prandtlror\" data-block-id=\"8a9c53a\"><style>.stk-8a9c53a {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-8a9c53a-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ba3fb23\" data-v=\"4\" data-block-id=\"ba3fb23\"><style>.stk-ba3fb23-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ba3fb23-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ba3fb23-inner-blocks\">\n<p>The measuring principle of impeller sensors is based on the conversion of rotary motion into electrical signals.<\/p>\n\n\n\n<p>The fluid causes the impeller to rotate. An inductive limit switch &#8220;counts&#8221; the revolutions of the impeller and generates a pulse sequence which is converted in the measuring instrument to a speed value (usually m\/s).<\/p>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Large diameter impeller sensors (\u00f8 60 mm and \u00f8 100 mm) are suitable for measuring turbulent flows (e.g. at ventilation grilles) at lower or intermediate speeds.<\/li>\n\n\n\n<li data-block-type=\"core\">Small diameters are more suitable for measurements in channels, whose cross-sectional area must be 10 times larger than the diameter of the sensor.<\/li>\n\n\n\n<li data-block-type=\"core\">Sensor with 16 mm diameter. has proven to be very versatile. It is large enough to have good starting characteristics and small enough to withstand speeds of up to 50 m\/s.<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-8b7dae2\" data-v=\"4\" data-block-id=\"8b7dae2\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-8b7dae2-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-8b7dae2-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"578\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px.jpg\" alt=\"Air speed 2 different wing wheels\" class=\"wp-image-27499\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px-300x289.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px-416x401.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/2-olika-vinghjul_600px-64x62.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-479c3ac avdelare\" data-block-id=\"479c3ac\"><style>.stk-479c3ac hr.stk-block-divider__hr{width:100% !important;}.stk-479c3ac {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-8bf1c45\" id=\"span-style-color-var-stk-global-color-74992-dc-0514-class-stk-highlight-viktigt-span-givarnas-placering-i-luftstrommen\" data-block-id=\"8bf1c45\"><style>.stk-8bf1c45 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\"><span style=\"color: var(--stk-global-color-74992, #dc0514);\" class=\"stk-highlight\">Important!  <\/span>The position of the sensors in the air stream.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-90d1228\" id=\"pitotror-prandtlror\" data-block-id=\"90d1228\"><style>.stk-90d1228 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-90d1228-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-a55a1c2\" data-v=\"4\" data-block-id=\"a55a1c2\"><style>.stk-a55a1c2-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-a55a1c2-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-a55a1c2-inner-blocks\">\n<p>For all sensor types &#8211; hot wire, impeller and pitot tube &#8211; it is very important that they are angled straight towards the airflow. Therefore, turn the sensor until the maximum value is displayed on the meter. Only then can the measured value be read. Especially important is the right angle to the air stream when measuring with pitot tubes.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-3ddee88\" data-v=\"4\" data-block-id=\"3ddee88\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-3ddee88-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-3ddee88-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"523\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare.jpg\" alt=\"Air speed wing wheel direction\" class=\"wp-image-27498\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare-300x262.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare-416x363.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/vinghjul-riktning_600px_kortare-64x56.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-dade8a5 avdelare\" data-block-id=\"dade8a5\"><style>.stk-dade8a5 hr.stk-block-divider__hr{width:100% !important;}.stk-dade8a5 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-f84e858\" id=\"luftflodesmatning\" data-block-id=\"f84e858\"><style>.stk-f84e858 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-bottom:25px !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Air flow measurement.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-c5d590f\" data-block-id=\"c5d590f\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-c5d590f-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-0784fc4\" data-v=\"4\" data-block-id=\"0784fc4\"><style>.stk-0784fc4-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-0784fc4-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-0784fc4-inner-blocks\">\n<p>There are several methods to determine the volume of air (l\/s or m\u00b3\/h) passing through a ventilation duct or out or in from a diffuser or grille. In the case of duct measurement, it is most common to measure with hot-wire, pitot tube or vane wheel sensors in the absence of fixed measuring devices. For exhaust air diffusers, a connector with a sensor mounted in its narrow part is usually used. Measuring on supply air grilles requires a special supply air nozzle with large openings on each side, partly to cover the entire surface of the grille and partly to avoid creating an excessive pressure drop in the ventilation system.<br\/><\/p>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-540357f avdelare\" id=\"noggrannhet\" data-block-id=\"540357f\"><style>.stk-540357f hr.stk-block-divider__hr{width:100% !important;}.stk-540357f {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-5c40cb7\" id=\"matning-i-kanal\" data-block-id=\"5c40cb7\"><style>.stk-5c40cb7 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Measurement in canal.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-536345c\" id=\"vinghjulsgivare\" data-block-id=\"536345c\"><style>.stk-536345c {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-536345c-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-f9f4c6f\" data-v=\"4\" data-block-id=\"f9f4c6f\"><style>.stk-f9f4c6f-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-f9f4c6f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-f9f4c6f-inner-blocks\">\n<p>If possible, the measurement should take place on a straight section of the canal. The straight section of duct should be at least 5 times as long as the inside diameter of the duct before the measurement point and 2 times as long after the measurement point. The flow profile shall not be disturbed in any way by flaps, sloping sections, angles, etc. Since the airflow is different in different parts of the duct cross-section, measurements should be taken at several different points and averaged before converting to volume flow. Also note that the diameter of the sensor should not be greater than 1:30 of the duct diameter to minimize the impact of the sensor on the airflow.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-453c902\" data-v=\"4\" data-block-id=\"453c902\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-453c902-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-453c902-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"239\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px.jpg\" alt=\"Air speed duct measurement\" class=\"wp-image-27494\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px-300x120.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px-416x166.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/kanalmatning-3-600px-64x25.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-f07f791 avdelare\" id=\"noggrannhet\" data-block-id=\"f07f791\"><style>.stk-f07f791 hr.stk-block-divider__hr{width:100% !important;}.stk-f07f791 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-792c89b\" id=\"matning-over-don-och-galler\" data-block-id=\"792c89b\"><style>.stk-792c89b {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-bottom:25px !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Measurement over ducts and grids.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-fb10326\" id=\"vinghjulsgivare\" data-block-id=\"fb10326\"><style>.stk-fb10326 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-fb10326-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-d84b5b7\" data-v=\"4\" data-block-id=\"d84b5b7\"><style>.stk-d84b5b7-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (min-width: 768px){.stk-d84b5b7 {flex:var(--stk-flex-grow, 1) 1 calc(50.5% - var(--stk-column-gap, 0px) * 1 \/ 2 ) !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-d84b5b7-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-d84b5b7-inner-blocks\">\n<p>Most diffusers and grilles now have fixed measuring outlets where the air flow can be calculated by measuring the pressure. If these are not available or if it is difficult to find the specifications of the jack, measurements with different types of jacks are used.<\/p>\n\n\n\n<p><strong>Exhaust air diffuser: <\/strong>the air flow is measured across the diffuser with a combination of an exhaust air nozzle and an air velocity measuring instrument. The airflow is calculated in the instrument using a shock factor.<\/p>\n\n\n\n<p><strong>Air diffuser: <\/strong>requires a special nozzle with a certain length and large openings that minimize the influence of pressure drop and turbulence on the measurement. The measurement result is presented directly in l\/s or m\u00b3\/h.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-10bbafe\" data-v=\"4\" data-block-id=\"10bbafe\"><style>@media screen and (min-width: 768px){.stk-10bbafe {flex:var(--stk-flex-grow, 1) 1 calc(49.5% - var(--stk-column-gap, 0px) * 1 \/ 2 ) !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-10bbafe-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-10bbafe-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-6d21303\" data-block-id=\"6d21303\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-6d21303-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-59df406\" data-v=\"4\" data-block-id=\"59df406\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-59df406-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-59df406-inner-blocks\">\n<figure class=\"wp-block-image size-full is-resized\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/stosmatning_300px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"236\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/stosmatning_300px.jpg\" alt=\"Air speed impact measurement\" class=\"wp-image-27497\" style=\"width:208px;height:163px\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/stosmatning_300px.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/stosmatning_300px-64x50.jpg 64w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/420-stos_300px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"421\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/420-stos_300px.jpg\" alt=\"Air speed testo 420 stos\" class=\"wp-image-27500\" style=\"width:235px;height:329px\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/420-stos_300px.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/420-stos_300px-214x300.jpg 214w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/420-stos_300px-64x90.jpg 64w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-17f857b avdelare\" id=\"noggrannhet\" data-block-id=\"17f857b\"><style>.stk-17f857b hr.stk-block-divider__hr{width:100% !important;}.stk-17f857b {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-962c435\" id=\"referensdonsmatning\" data-block-id=\"962c435\"><style>.stk-962c435 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-bottom:25px !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Reference drone measurement.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-7bc3877\" id=\"vinghjulsgivare\" data-block-id=\"7bc3877\"><style>.stk-7bc3877 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-7bc3877-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-272bf42\" data-v=\"4\" data-block-id=\"272bf42\"><style>.stk-272bf42-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-272bf42-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-272bf42-inner-blocks\">\n<p>When adjusting slightly larger ventilation systems, you need to have control of the device that is furthest out in the system, the so-called reference device. Previously, you had to have a person who monitored this device and reported its readings to the adjuster. Now there is modern technology that continuously monitors the reference sensor and relays the measured values to the adjuster via the mobile network and apps that deliver customized information.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-54cb1ff\" data-v=\"4\" data-block-id=\"54cb1ff\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-54cb1ff-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-54cb1ff-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"345\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px.jpg\" alt=\"Air speed Celsivent\" class=\"wp-image-27491\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px-300x173.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px-416x239.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/celsivent_600px-64x37.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-c2deea5 avdelare\" id=\"noggrannhet\" data-block-id=\"c2deea5\"><style>.stk-c2deea5 hr.stk-block-divider__hr{width:100% !important;}.stk-c2deea5 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-f4f57cd\" id=\"svensk-standard-ss-en-16211-2024\" data-block-id=\"f4f57cd\"><style>.stk-f4f57cd {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-bottom:25px !important;margin-left:auto !important;}<\/style><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Swedish standard SS-EN 16211:2024.<\/h2><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-1535773\" id=\"referensdonsmatning\" data-block-id=\"1535773\"><style>.stk-1535773 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-1535773-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-e093a05\" data-v=\"4\" data-block-id=\"e093a05\"><style>.stk-e093a05-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-e093a05-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-e093a05-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-4b5b14b\" id=\"luftbehandling-faltmetoder-for-matning-av-luftfloden\" data-block-id=\"4b5b14b\"><h3 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Air treatment &#8211; Field methods for the measurement of air flow rates<\/h3><\/div>\n\n\n\n<p>This document describes the standards and methods for measuring air flows. Also covers more details and methods than described above. It can be ordered from SIS, the Swedish Standards Institute or from Svensk Byggtj\u00e4nst.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-96ac0e9\" data-v=\"4\" data-block-id=\"96ac0e9\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-96ac0e9-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-96ac0e9-inner-blocks\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><a href=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"350\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px.jpg\" alt=\"Air speed SS-EN 16211:2015 eu standard\" class=\"wp-image-27492\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px.jpg 600w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px-300x175.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px-416x243.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/12\/eu-standard_600px-64x37.jpg 64w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-divider stk-block-divider stk-block stk-ecb23e1\" data-block-id=\"ecb23e1\"><style>.stk-ecb23e1 hr.stk-block-divider__hr{width:100% !important;}.stk-ecb23e1 {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><hr class=\"stk-block-divider__hr\"\/><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-30a1e5b\" data-block-id=\"30a1e5b\"><style>.stk-30a1e5b {margin-bottom:0px !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-30a1e5b-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-1934b46\" data-v=\"4\" data-block-id=\"1934b46\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-1934b46-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-1934b46-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-5e6f639\" data-block-id=\"5e6f639\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-5e6f639-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-9cc3369\" data-v=\"4\" data-block-id=\"9cc3369\"><style>.stk-9cc3369-container{max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-9cc3369-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-9cc3369-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-0f86c34\" id=\"exempel-pa-luftflodesmatare-fran-nordtec\" data-block-id=\"0f86c34\"><h2 class=\"stk-block-heading__text stk-block-heading--use-theme-margins\">Example of an air flow meter from Nordtec.<\/h2><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-bc4a63c produktforslag\" data-block-id=\"bc4a63c\"><style>.stk-bc4a63c {max-width:800px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-bc4a63c-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-7ce8959\" data-v=\"4\" data-block-id=\"7ce8959\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-7ce8959-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-7ce8959-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-8ff5f70\" data-block-id=\"8ff5f70\"><style>.stk-8ff5f70 .stk-img-wrapper{height:135px !important;}.stk-8ff5f70 .stk-img-wrapper img{object-position:34% 65% !important;}@media screen and (max-width: 1023px){.stk-8ff5f70 .stk-img-wrapper{width:100% !important;height:171px !important;}}@media screen and (max-width: 767px){.stk-8ff5f70 .stk-img-wrapper{width:100% !important;height:200px !important;}}<\/style><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-17018\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px.jpg\" width=\"800\" height=\"800\" alt=\"testo 440 CO2 measurement kit - 0563 4405 - Environment 3\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px.jpg 800w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-300x300.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-150x150.jpg 150w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-768x768.jpg 768w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-324x324.jpg 324w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-416x416.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-100x100.jpg 100w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/testo-400-0632-1551-CO2-probe-with-Bluetooth-incl-temperature-and-humidity-sensor-V1-EN_800px-64x64.jpg 64w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/span><\/figure><\/div>\n\n\n\n<p><span style=\"color: #000000;\" class=\"stk-highlight\"><strong>Manual instrument<\/strong><\/span><\/p>\n\n\n\n<p>Testo has a wide range of portable handheld instruments for measuring air velocity and air flow. In addition, a wide range of sensors and accessories for almost every conceivable application.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/produkter\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/?lang=en\">See the range<\/a><\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-7da6708\" data-v=\"4\" data-block-id=\"7da6708\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-7da6708-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-7da6708-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-fd68cff\" data-block-id=\"fd68cff\"><style>.stk-fd68cff {align-items:center !important;display:flex !important;}.stk-fd68cff .stk-img-wrapper{width:100% !important;height:135px !important;}.stk-fd68cff .stk-img-wrapper img{object-position:77% 40% !important;}@media screen and (max-width: 1023px){.stk-fd68cff .stk-img-wrapper{width:100% !important;height:171px !important;}}@media screen and (max-width: 767px){.stk-fd68cff .stk-img-wrapper{width:100% !important;height:200px !important;}}<\/style><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-21970\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px.jpg\" width=\"800\" height=\"800\" alt=\"0554 4209 testo 420 stand 3\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px.jpg 800w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-300x300.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-150x150.jpg 150w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-768x768.jpg 768w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-324x324.jpg 324w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-416x416.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-100x100.jpg 100w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2022\/03\/0554-4209-testo-420_p_ap_vel_005610_DE_RETOUCH_800px-64x64.jpg 64w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/span><\/figure><\/div>\n\n\n\n<p><strong><span style=\"color: #000000;\" class=\"stk-highlight\">Stosar<\/span><\/strong><\/p>\n\n\n\n<p><span style=\"color: #000000;\" class=\"stk-highlight\">In addition to a number of smaller probes for exhaust air measurement, there is also the testo 420 which can be used for both supply and exhaust air measurement. Airflow rectifiers provide accurate measurement results.<\/span><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/produkt\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-420-volume-flow-hood-with-airflow-straightener\/?lang=en\">Read more about testo 420<\/a><\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-2903c0f\" data-v=\"4\" data-block-id=\"2903c0f\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-2903c0f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-2903c0f-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-82e2171\" data-block-id=\"82e2171\"><style>.stk-82e2171 .stk-img-wrapper{width:100% !important;height:135px !important;}@media screen and (max-width: 1023px){.stk-82e2171 .stk-img-wrapper{width:100% !important;height:171px !important;}}@media screen and (max-width: 767px){.stk-82e2171 .stk-img-wrapper{width:100% !important;height:200px !important;}}<\/style><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-55562\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px.jpg\" width=\"800\" height=\"450\" alt=\"0170 4000 CelsiVent Reference air outlet meter\" srcset=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px.jpg 800w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px-300x169.jpg 300w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px-768x432.jpg 768w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px-50x28.jpg 50w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px-416x234.jpg 416w, https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/10\/Celsicom-V600-NZ5A9479_800x450px-64x36.jpg 64w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/span><\/figure><\/div>\n\n\n\n<p><strong><span style=\"color: #000000;\" class=\"stk-highlight\">Reference sound level meter for ventilation adjustment<\/span><\/strong><\/p>\n\n\n\n<p><span style=\"color: #000000;\" class=\"stk-highlight\">Connected, reliable measurement. Measurement values updated in seconds.  Adjusting ventilation doesn&#8217;t get any easier than this.<\/span><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/campaign\/celsicom-v600\/?lang=en\" target=\"_blank\" rel=\"noreferrer noopener\">Read more about Celsicom V600<\/a><\/p>\n<\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>About air velocity, air flow, supply and extract air, sensors for different types of measurements and practical tips on how to measure in ducts, over diffusers and grilles and make reference diffuser measurements.<\/p>\n","protected":false},"author":1,"featured_media":40049,"parent":41629,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","footnotes":""},"class_list":["post-41637","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the 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