{"id":690,"date":"2015-11-02T21:09:25","date_gmt":"2015-11-02T20:09:25","guid":{"rendered":"http:\/\/jes-2015.projekt.gastropoint.com\/en\/?post_type=portfolio&#038;p=690"},"modified":"2025-07-04T22:02:16","modified_gmt":"2025-07-04T20:02:16","slug":"tfl-us-air-flow-measuring-system-ultrasonic","status":"publish","type":"portfolio","link":"https:\/\/www.tunnelsicherheit.at\/en\/product\/tfl-us-air-flow-measuring-system-ultrasonic\/","title":{"rendered":"t\/FL-USX Air flow monitoring system &#8211; Ultrasonic cross-section<br>"},"content":{"rendered":"<div  class='flex_column av-6hgti5-41e60f65dc39a5afceab6ddf9b830932 av_one_full  avia-builder-el-0  el_before_av_three_fourth  avia-builder-el-first  first flex_column_div  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-6cjv4t-a8966344f4733d7be7e9cb60a137fcb1\">\n.avia-image-container.av-6cjv4t-a8966344f4733d7be7e9cb60a137fcb1 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-6cjv4t-a8966344f4733d7be7e9cb60a137fcb1 .av-image-caption-overlay-center{\ncolor:#ffffff;\nfont-size:30px;\n}\n<\/style>\n<div  class='avia-image-container av-6cjv4t-a8966344f4733d7be7e9cb60a137fcb1 av-styling- avia-align-center  avia-builder-el-1  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-852 avia-img-lazy-loading-not-852 avia_image ' src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?fit=1210%2C564&ssl=1\" alt='' title='tASUS_Slider'  height=\"564\" width=\"1210\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?w=1210&amp;ssl=1 1210w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?resize=300%2C140&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?resize=1030%2C480&amp;ssl=1 1030w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?resize=705%2C329&amp;ssl=1 705w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?resize=450%2C210&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/07\/tASUS_Slider1.jpg?resize=800%2C373&amp;ssl=1 800w\" sizes=\"(max-width: 1210px) 100vw, 1210px\" \/><\/div><\/div><\/div><\/div>\n<div  class='flex_column av-68v1hx-48764e486dcc79502253df006b3e7b96 av_three_fourth  avia-builder-el-2  el_after_av_one_full  el_before_av_one_fourth  first flex_column_div  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-62pp4t-661f2be1f80936c3157a5d5a0d5ca7b7\">\n#top .av-special-heading.av-62pp4t-661f2be1f80936c3157a5d5a0d5ca7b7{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-62pp4t-661f2be1f80936c3157a5d5a0d5ca7b7 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-62pp4t-661f2be1f80936c3157a5d5a0d5ca7b7 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-62pp4t-661f2be1f80936c3157a5d5a0d5ca7b7 av-special-heading-h3  avia-builder-el-3  el_before_av_textblock  avia-builder-el-first '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Air flow measurement based on difference of transition times of ultrasonic pulses<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-5xp5wl-a23083b2370557daae292f39f6b279d1 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>The t\/FL-USX ultrasonic air flow measurement system measures the air flow using the ultrasonic transit time difference method. The air flow is measured across the entire tunnel cross-section. The method therefore offers a much more reliable determination of the average flow velocity than single or two-point measurements.  <\/p>\n<p>Two sensors are mounted below the tunnel ceiling, cross section with an angle of 30\u00b0 to 60\u00b0 (usually 45\u00b0) such that a vector component of the air flow overlaps the direction of the ultrasonic sound pulses exchanged by the two sensors. <\/p>\n<p>Air flow in the tunnel influences the transition time of the pulses between sender and receiver. Based on the difference in transition times of ultra-sonic pulses sent in one or the other direction the measured values are calculated. Measured values are air speed, air flow rate, direction of air flow and air temperature.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-cx9fh-de30b98032ea4d8b9730abb95d10fa7a\">\n#top .av-special-heading.av-cx9fh-de30b98032ea4d8b9730abb95d10fa7a{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-cx9fh-de30b98032ea4d8b9730abb95d10fa7a .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-cx9fh-de30b98032ea4d8b9730abb95d10fa7a .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-cx9fh-de30b98032ea4d8b9730abb95d10fa7a av-special-heading-h3  avia-builder-el-5  el_after_av_textblock  el_before_av_tab_container '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >t\/FL-USX Air flow monitoring system &#8211; Ultrasonic cross-section<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<div  class='tabcontainer av-4pk345-c8ff457f04a43caeb35b2b36253679de top_tab  avia-builder-el-6  el_after_av_heading  el_before_av_heading '>\n<section class='av_tab_section av_tab_section av-4la01p-cbaaaa999cc60e7b86985d5796dc10a5'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div id='tab-id-1-tab' class='tab active_tab' role='tab' aria-selected=\"true\" tabindex=\"0\" data-fake-id='#tab-id-1' aria-controls='tab-id-1-content'  itemprop=\"headline\" ><span class='tab_icon avia-iconfont avia-font-entypo-fontello' data-av_icon='\ue81e' data-av_iconfont='entypo-fontello' ><\/span>Features<\/div><div id='tab-id-1-content' class='tab_content active_tab_content' role='tabpanel' aria-labelledby='tab-id-1-tab' aria-hidden=\"false\"><div class='tab_inner_content invers-color'  itemprop=\"text\" ><ul>\n<li>Accurate ultrasonic air flow measuring system based on different transition times of ultrasonic pulses<\/li>\n<li><strong>Measurement of average air flow over the whole tunnel cross section<\/strong><\/li>\n<li>Sensor setup via service interface<\/li>\n<li>\u2022 Suitable for <strong>tunnel cross sections up to 18 m<\/strong> (Measuring path up to 25 m)<\/li>\n<li>Connection to tunnel control system either via <strong>analogue output and relays<\/strong>or via <strong>RS-485 MODBUS RTU<\/strong><\/li>\n<li>Visible LEDs to indicate sensor status<\/li>\n<li><strong>Corrosion-resistant non-wearing polyamide membranes<\/strong><\/li>\n<li>Optional, remote touch operating unit to display measured values and to modify parameters<\/li>\n<\/ul>\n<\/div><\/div><\/section>\n<section class='av_tab_section av_tab_section av-4dydb1-acef2c8eeeadd92f8e0a0379dd493575'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div id='tab-id-2-tab' class='tab' role='tab' aria-selected=\"false\" tabindex=\"0\" data-fake-id='#tab-id-2' aria-controls='tab-id-2-content'  itemprop=\"headline\" ><span class='tab_icon avia-iconfont avia-font-entypo-fontello' data-av_icon='\ue856' data-av_iconfont='entypo-fontello' ><\/span>System<\/div><div id='tab-id-2-content' class='tab_content' role='tabpanel' aria-labelledby='tab-id-2-tab' aria-hidden=\"true\"><div class='tab_inner_content invers-color'  itemprop=\"text\" ><ul>\n<li><strong>Two sensors (master &amp; slave)<\/strong>with mounting clamps mounted below the tunnel ceiling in an angle of30\u00b0 to 60\u00b0 to the tunnel axis<\/li>\n<li><strong>Terminal box for master<\/strong> to connect the power supply and the connections to the tunnel control system and the slave<\/li>\n<li><strong>Terminal box for slave<\/strong><\/li>\n<li>Optional remote touch operating unit<\/li>\n<\/ul>\n<\/div><\/div><\/section>\n<section class='av_tab_section av_tab_section av-49c7tp-ef0fa154b2f5a896638206b68d9d8cbb'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div id='tab-id-3-tab' class='tab' role='tab' aria-selected=\"false\" tabindex=\"0\" data-fake-id='#tab-id-3' aria-controls='tab-id-3-content'  itemprop=\"headline\" ><span class='tab_icon avia-iconfont avia-font-entypo-fontello' data-av_icon='\ue82b' data-av_iconfont='entypo-fontello' ><\/span>Advantages<\/div><div id='tab-id-3-content' class='tab_content' role='tabpanel' aria-labelledby='tab-id-3-tab' aria-hidden=\"true\"><div class='tab_inner_content invers-color'  itemprop=\"text\" ><ul>\n<li>Specifically designed for application in tunnels<\/li>\n<li><strong>No control unit required<\/strong><\/li>\n<li>Easy configuration<\/li>\n<li>Corrosion resistant against aggressive tunnel atmosphere<\/li>\n<li><strong>Sensors can be replaced quickly with no tools and no realignment required<\/strong><\/li>\n<li><strong>Proven in high speed train tunnels with train speeds up to 350 km\/h<\/strong><\/li>\n<li><strong>No expendables<\/strong> (e.g. ultrasonic membranes)<\/li>\n<li>Extremely low maintenance requirements<\/li>\n<\/ul>\n<\/div><\/div><\/section>\n<section class='av_tab_section av_tab_section av-ak7p9-cea9dca3e9a14e323d0db39a4e047d5f'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div id='tab-id-4-tab' class='tab' role='tab' aria-selected=\"false\" tabindex=\"0\" data-fake-id='#tab-id-4' aria-controls='tab-id-4-content'  itemprop=\"headline\" ><span class='tab_icon avia-iconfont avia-font-entypo-fontello' data-av_icon='\ue84b' data-av_iconfont='entypo-fontello' ><\/span>Technical Specifications<\/div><div id='tab-id-4-content' class='tab_content' role='tabpanel' aria-labelledby='tab-id-4-tab' aria-hidden=\"true\"><div class='tab_inner_content invers-color'  itemprop=\"text\" ><div id=\"rdp-we-main\" data-resource=\"https:\/\/doc.tunnelsafety.at\/tfl-usx-techdata_EN\">\n<div class=\"dokuwiki export\">\n\n\n\n<p>\n<img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=600&amp;tok=699343&amp;media=media:tfl-usx:d-fl220t.png\" class=\"mediacenter\" loading=\"lazy\" title=\" t\/FL-USX Air Flow Monitoring System\" alt=\" t\/FL-USX Air Flow Monitoring System\" style=\"width: 100%;max-width: 400px;height: auto;\" \/>\n<br style=\"page-break-after:always;\">\n<\/p>\n\n\n\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;Application&quot;,&quot;hid&quot;:&quot;application&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:6,&quot;range&quot;:&quot;2507-4339&quot;} -->\n<h2 class=\"sectionedit7\" id=\"rdp-we-technical_specifications\">Technical Specifications<\/h2>\n<div class=\"level2\">\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"2\">Air flow measurement<\/th>\n<\/tr>\n<tr>\n<td>Type<\/td>\n<td>JES t\/FL-USX<\/td>\n<\/tr>\n<tr>\n<td>Measuring method<\/td>\n<td>Determination of direction dependant differential transi-tion times of ultrasonic pulses<\/td>\n<\/tr>\n<tr>\n<td>Measured values<\/td>\n<td>Air speed <br\/>\nAir flow rate <br\/>\nDirection of air flow <br\/>\nAir temperature<\/td>\n<\/tr>\n<tr>\n<td>Measuring range<\/td>\n<td> -40 .. 40 m\/s<\/td>\n<\/tr>\n<tr>\n<td>Resolution<\/td>\n<td>0.1 m\/s, accuracy depending on measuring distance, flow profile, installation, typically &lt;\u00b10.2 m\/s at 3 m\/s<\/td>\n<\/tr>\n<tr>\n<td>Response time<\/td>\n<td>&gt; 1s \u2026 180 s, configurable<\/td>\n<\/tr>\n<tr>\n<td>Measurement path length<\/td>\n<td>1.2 - 25 m<\/td>\n<\/tr>\n<tr>\n<td>Alignment<\/td>\n<td>30 - 60\u00b0 to tunnel longitudinal axis, typically 45\u00b0<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"2\">Outputs<\/th>\n<\/tr>\n<tr>\n<td>Analogue output<\/td>\n<td>1 x 4-20 mA, 400 \u03a9, isolated <br\/>\ncan be assigned any measured value and output range<\/td>\n<\/tr>\n<tr>\n<td>Output range<\/td>\n<td>configurable, typically: -20 to 20 m\/s<\/td>\n<\/tr>\n<tr>\n<td>Relay contacts<\/td>\n<td>1 x fault indication (NC) <br\/>\n1 x direction of air flow (NC) <br\/>\n(max. 48 V \/ 0.5 A)<\/td>\n<\/tr>\n<tr>\n<td>Digital interfaces<\/td>\n<td>1x RS 485 MODBUS RTU to control system, bidirectional <br\/>\n1x Intercom RS 485 master-slave<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<p>\n<br style=\"page-break-after:always;\">\n<\/p>\n\n<\/div>\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;Technical Specifications&quot;,&quot;hid&quot;:&quot;technical_specifications&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:7,&quot;range&quot;:&quot;4340-5710&quot;} -->\n<h3 class=\"sectionedit8\" id=\"rdp-we-ultrasonic_transceiver_sensor\">Ultrasonic transceiver (sensor)<\/h3>\n<div class=\"level3\">\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"3\">Sensor<\/th>\n<\/tr>\n<tr>\n<td>Type<\/td>\n<td>DURAG D-FL 220T M<\/td>\n<td rowspan=\"15\" class=\"image\"><a href=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/detail.php?id=en%3Adatasheets%3Atfl-usx&media=media:tfl-usx:d-fl220t.png\" class=\"media wiki-link\" title=\"media:tfl-usx:d-fl220t.png\" target=\"_new\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=200&amp;tok=0c4660&amp;media=media:tfl-usx:d-fl220t.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"200\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td>Operating voltage<\/td>\n<td>24 <abbr title=\"Volts Direct Current\">VDC<\/abbr> \u00b1 10 %<\/td>\n<\/tr>\n<tr>\n<td>Current consumption<\/td>\n<td>1 A<\/td>\n<\/tr>\n<tr>\n<td>Appliance class<\/td>\n<td>Class III<\/td>\n<\/tr>\n<tr>\n<td>Service interface<\/td>\n<td>USB 1.1<\/td>\n<\/tr>\n<tr>\n<td>MTBF<\/td>\n<td>&gt; 170.000 h within service life if used within specifications<\/td>\n<\/tr>\n<tr>\n<td>Material<\/td>\n<td>Sensor housing: Polyamide RAL5017, Flammability rating: B1 (UL 94 V0) <br\/>\nWall bracket: Stainless steel 1.4404 (AISI 316L) or 1.4571 (AISI 316Ti)<\/td>\n<\/tr>\n<tr>\n<td>IP rating<\/td>\n<td>IP 69<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>270 x 130 x 95 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>Sensor 2.2 kg <br\/>\nWall bracket 1.6 kg<\/td>\n<\/tr>\n<tr>\n<td>Indoor\/Outdoor use<\/td>\n<td>Indoor use (tunnel)<\/td>\n<\/tr>\n<tr>\n<td>Altitude<\/td>\n<td>up to 2,000 m<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td> -40 .. +70 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Humidity range<\/td>\n<td>0 .. 100% relative humidity (non-condensing)<\/td>\n<\/tr>\n<tr>\n<td>Pollution degree<\/td>\n<td>4 (intended environment)\n<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<p>\n<br style=\"page-break-after:always;\">\n<\/p>\n\n<\/div>\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;Ultrasonic transceiver (sensor)&quot;,&quot;hid&quot;:&quot;ultrasonic_transceiver_sensor&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:8,&quot;range&quot;:&quot;5711-6721&quot;} -->\n<h3 class=\"sectionedit9\" id=\"rdp-we-t_fl-usx-tbx_terminal_boxes\">t\/FL-USX-TBX terminal boxes<\/h3>\n<div class=\"level3\">\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"3\">Terminal box A - JES t\/FL-USX-TBX-A<\/th>\n<\/tr>\n<tr>\n<td>Type<\/td>\n<td>t\/FL-USX-TBX-A<\/td>\n<td rowspan=\"17\" class=\"image\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=200&amp;tok=7bf969&amp;media=media:tfl-usx:430007-00_t-fl-usx-tbx-a-blank-std_asm_front2.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"200\" \/><\/td>\n<\/tr>\n<tr>\n<td>System cable port<\/td>\n<td>1 (for D-FL 220 T M Sensor A)<\/td>\n<\/tr>\n<tr>\n<td>Power supply<\/td>\n<td>100 to 240 <abbr title=\"Volts Alternating Current\">VAC<\/abbr>, 50\/60 <abbr title=\"Hertz\">Hz<\/abbr><\/td>\n<\/tr>\n<tr>\n<td>Supply voltage fluctuations<\/td>\n<td>\u00b1 10 %<\/td>\n<\/tr>\n<tr>\n<td>Overvoltage category<\/td>\n<td>II<\/td>\n<\/tr>\n<tr>\n<td>Power rating<\/td>\n<td>60 W<\/td>\n<\/tr>\n<tr>\n<td>Appliance class<\/td>\n<td>Class I<\/td>\n<\/tr>\n<tr>\n<td>Material<\/td>\n<td>Stainless steel 1.4404 (AISI 316L)<\/td>\n<\/tr>\n<tr>\n<td>Mounting<\/td>\n<td>incl. mounting clamp made from Stainless steel 1.4404 for wall mounting<\/td>\n<\/tr>\n<tr>\n<td>IP rating<\/td>\n<td>IP 69<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>250 x 160 x 110 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>approx. 3.2 kg<\/td>\n<\/tr>\n<tr>\n<td>Indoor\/Outdoor use<\/td>\n<td>Indoor use (tunnel)<\/td>\n<\/tr>\n<tr>\n<td>Altitude<\/td>\n<td>up to 2,000 m<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td> -40 .. +60 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Humidity range<\/td>\n<td>0 .. 100% relative humidity (non-condensing)<\/td>\n<\/tr>\n<tr>\n<td>Pollution degree<\/td>\n<td>4 (intended environment) \/ 2 (when cover removed)\n<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"3\">Terminal box B - t\/FL-USX-TBX-B<\/th>\n<\/tr>\n<tr>\n<td>Type<\/td>\n<td>t\/FL-USX-TBX-B<\/td>\n<td rowspan=\"14\" class=\"image\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=150&amp;tok=d9473b&amp;media=media:tfl-usx:430009-00_t-fl-usx-tbx-b-blank-std_asm_front1.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"150\" \/><\/td>\n<\/tr>\n<tr>\n<td>System cable port<\/td>\n<td>1 (for D-FL 220 T M Sensor B)<\/td>\n<\/tr>\n<tr>\n<td>Power supply<\/td>\n<td>24 <abbr title=\"Volts Direct Current\">VDC<\/abbr> \u00b110 %<\/td>\n<\/tr>\n<tr>\n<td>Current rating<\/td>\n<td>1 A<\/td>\n<\/tr>\n<tr>\n<td>Appliance class<\/td>\n<td>Class III<\/td>\n<\/tr>\n<tr>\n<td>Material<\/td>\n<td>Stainless steel 1.4404 (AISI 316L)<\/td>\n<\/tr>\n<tr>\n<td>Mounting<\/td>\n<td>incl. mounting clamp made from Stainless steel 1.4404 for wall mounting<\/td>\n<\/tr>\n<tr>\n<td>IP rating<\/td>\n<td>IP 69<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>160 x 160 x 110 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>approx. 1.9 kg<\/td>\n<\/tr>\n<tr>\n<td>Indoor\/Outdoor use<\/td>\n<td>Indoor use (tunnel)<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td> -40 .. +60 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Humidity range<\/td>\n<td>0 .. 100% relative humidity (non-condensing)<\/td>\n<\/tr>\n<tr>\n<td>Pollution degree<\/td>\n<td>4 (intended environment) \/ 2 (when cover removed)\n<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<p>\n<br style=\"page-break-after:always;\">\n<\/p>\n\n<\/div>\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;t\\\/FL-USX-TBX terminal boxes&quot;,&quot;hid&quot;:&quot;t_fl-usx-tbx_terminal_boxes&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:9,&quot;range&quot;:&quot;6722-8728&quot;} -->\n<h3 class=\"sectionedit10\" id=\"rdp-we-smart_box-s-fl-usx_gateway_instead_of_t_fl-usx-tbx-a_for_ethernet_connection\">smart\/BOX-S-FL-USX gateway (instead of t\/FL-USX-TBX-A for Ethernet connection)<\/h3>\n<div class=\"level3\">\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"3\">smart\/Architecture gateway for t\/FL-USX - smart\/BOX-S-FL-USX<\/th>\n<\/tr>\n<tr>\n<td>Type<\/td>\n<td>smart\/BOX-S-FL-USX<\/td>\n<td rowspan=\"18\" class=\"image\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=200&amp;tok=7bf969&amp;media=media:tfl-usx:430007-00_t-fl-usx-tbx-a-blank-std_asm_front2.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"200\" \/><\/td>\n<\/tr>\n<tr>\n<td>System cable port<\/td>\n<td>1 (for D-FL 220 T M sensor)<\/td>\n<\/tr>\n<tr>\n<td>Power supply<\/td>\n<td>100 to 240 <abbr title=\"Volts Alternating Current\">VAC<\/abbr>, 50\/60 <abbr title=\"Hertz\">Hz<\/abbr><\/td>\n<\/tr>\n<tr>\n<td>Supply voltage fluctuations<\/td>\n<td>\u00b1 10 %<\/td>\n<\/tr>\n<tr>\n<td>Overvoltage category<\/td>\n<td>II<\/td>\n<\/tr>\n<tr>\n<td>Power rating<\/td>\n<td>60 W<\/td>\n<\/tr>\n<tr>\n<td>Appliance class<\/td>\n<td>Class I<\/td>\n<\/tr>\n<tr>\n<td>Digital interfaces<\/td>\n<td>MODBUS RTU (RS-485) <br\/>\nMODBUS\/TCP (Ethernet) <br\/>\nWebserver for configuration (Ethernet)<\/td>\n<\/tr>\n<tr>\n<td>Material<\/td>\n<td>Stainless steel 1.4404 (AISI 316L)<\/td>\n<\/tr>\n<tr>\n<td>Mounting<\/td>\n<td>incl. mounting clamp made from Stainless steel 1.4404 for wall mounting<\/td>\n<\/tr>\n<tr>\n<td>IP rating<\/td>\n<td>IP 69<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>250 x 160 x 110 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>approx. 3.2 kg<\/td>\n<\/tr>\n<tr>\n<td>Indoor\/Outdoor use<\/td>\n<td>Indoor use (tunnel)<\/td>\n<\/tr>\n<tr>\n<td>Altitude<\/td>\n<td>up to 2,000 m<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td> -40 .. +60 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Humidity range<\/td>\n<td>0 .. 100% relative humidity (non-condensing)<\/td>\n<\/tr>\n<tr>\n<td>Pollution degree<\/td>\n<td>4 (intended environment) \/ 2 (when cover removed)\n<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<\/div>\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;smart\\\/BOX-S-FL-USX gateway (instead of t\\\/FL-USX-TBX-A for Ethernet connection)&quot;,&quot;hid&quot;:&quot;smart_box-s-fl-usx_gateway_instead_of_t_fl-usx-tbx-a_for_ethernet_connection&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:10,&quot;range&quot;:&quot;8729-9999&quot;} -->\n<h3 class=\"sectionedit11\" id=\"rdp-we-conformities\">Conformities<\/h3>\n<div class=\"level3\">\n\n<p>\n<table class=\"techdata\" style=\"\">\n<tr>\n<th colspan=\"2\">Conformities<\/th>\n<\/tr>\n<tr>\n<td>Markings<\/td>\n<td><a href=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/detail.php?id=en%3Adatasheets%3Atfl-usx&media=media:common:ce_logo.png\" class=\"media wiki-link\" title=\"media:common:ce_logo.png\" target=\"_new\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=50&amp;tok=740819&amp;media=media:common:ce_logo.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"50\" \/><\/a>  <a href=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/detail.php?id=en%3Adatasheets%3Atfl-usx&media=media:common:ccsaus_mark_transparent.png\" class=\"media wiki-link\" title=\"media:common:ccsaus_mark_transparent.png\" target=\"_new\"><img decoding=\"async\" src=\"https:\/\/doc.tunnelsafety.at\/lib\/exe\/fetch.php?w=50&amp;tok=82beda&amp;media=media:common:ccsaus_mark_transparent.png\" class=\"media\" loading=\"lazy\" alt=\"\" width=\"50\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td>Electrical standards<\/td>\n<td>2014\/35\/EU Low Voltage Directive (<abbr title=\"Low Voltage Directive\">LVD<\/abbr>) <br\/>\n\n2014\/30\/EU Electromagnetic compatibility (<abbr title=\"Electromagnetic Compatibility\">EMC<\/abbr>) <br\/>\n\nEN 61010-1 Safety requirements for electrical equipment for measurement, control and laboratory use <br\/>\n\nEN 61326-1 Electrical equipment for measurement, control and laboratory use - <abbr title=\"Electromagnetic Compatibility\">EMC<\/abbr> requirements<\/td>\n<\/tr>\n<tr>\n<td>Tunnel safety standards<\/td>\n<td>Austria: <abbr title=\"Richtlinien und Vorschriften f\u00fcr das Stra\u00dfenwesen (Guidelines and provisions for the road sector)\">RVS<\/abbr> 09.02.22 <br\/>\n\nGermany: <abbr title=\"Richtlinien f\u00fcr die Ausstattung und den Betrieb von Stra\u00dfentunneln (Guidelines for the equipment and operation of road tunnels)\">RABT<\/abbr> 2006 <br\/>\n\nSwitzerland: ASTRA RL 13001, Fachhandbuch BSA <br\/>\n\nNorway: Norwegian Public Roads Administration Handbook No. 021 Road Tunnels <br\/>\n\nInternational: ISO 23431 Measurement of road tunnel air quality<\/td>\n<\/tr>\n<\/table>\n\n<\/p>\n\n<\/div>\n<!-- EDIT{&quot;target&quot;:&quot;section&quot;,&quot;name&quot;:&quot;Conformities&quot;,&quot;hid&quot;:&quot;conformities&quot;,&quot;codeblockOffset&quot;:0,&quot;secid&quot;:11,&quot;range&quot;:&quot;10000-&quot;} --><\/div>\n<\/div><!-- #rdp-we-main -->\n<\/div><\/div><\/section>\n<\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2h4xt1-e4bd0dd3c4efe46d0f59e34d18320b0f\">\n#top .av-special-heading.av-2h4xt1-e4bd0dd3c4efe46d0f59e34d18320b0f{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-2h4xt1-e4bd0dd3c4efe46d0f59e34d18320b0f .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-2h4xt1-e4bd0dd3c4efe46d0f59e34d18320b0f .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-2h4xt1-e4bd0dd3c4efe46d0f59e34d18320b0f av-special-heading-h3  avia-builder-el-7  el_after_av_tab_container  el_before_av_image_hotspot  avia-builder-el-last '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >System setup<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-sub-av-28d2nx-30ee0178683bd3fe99e3891bc939b77a\">\n.av-hotspot-image-container .av-image-hotspot.av-254y3x-25aea978f56222e6e590a8234ff1530f{\ntop:61.7%;\nleft:46.9%;\n}\n.av-hotspot-image-container .av-image-hotspot.av-1y2x1p-c3f8ddcae9e1861675d2a1ff6bff6e04{\ntop:3.7%;\nleft:62.6%;\n}\n.av-hotspot-image-container .av-image-hotspot.av-1sdjj1-acfb43ea0b659104825e22fc4371566b{\ntop:64.8%;\nleft:57.2%;\n}\n.av-hotspot-image-container .av-image-hotspot.av-1n5dlx-c92b183e7f31a1d8e6628bb24a8a27a4{\ntop:3.9%;\nleft:73.8%;\n}\n.av-hotspot-image-container .av-image-hotspot.av-1e9zx9-d10495dc1827bdc22ff4cd75c264b2ad{\ntop:74.9%;\nleft:64.6%;\n}\n.av-hotspot-image-container .av-image-hotspot.av-16rcv9-aed20890552e3ce0c127b94826fc3fc9{\ntop:86.2%;\nleft:56.8%;\n}\n<\/style>\n<div  class='av-hotspot-image-container av-28d2nx-30ee0178683bd3fe99e3891bc939b77a  avia-builder-el-8  el_after_av_heading  avia-builder-el-last  av-hotspot-numbered av-mobile-fallback-active  av-non-fullwidth-hotspot-image'  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class='av-hotspot-container'><div class='av-hotspot-container-inner-cell'><div class='av-hotspot-container-inner-wrap'><div class='av-image-hotspot av-254y3x-25aea978f56222e6e590a8234ff1530f av-image-hotspot-1 ' data-avia-tooltip-position='right' data-avia-tooltip-alignment='bottom' data-avia-tooltip-class='av-tt-large-width av-tt-pos-right av-tt-align-bottom  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Air flow sensor A (Master)&lt;\/strong&gt;&lt;\/p&gt;\n&lt;p&gt;The master sensor is mounted on one tunnel wall and aligned with the slave on the opposite wall.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>1<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><div class='av-image-hotspot av-1y2x1p-c3f8ddcae9e1861675d2a1ff6bff6e04 av-image-hotspot-2 ' data-avia-tooltip-position='right' data-avia-tooltip-alignment='bottom' data-avia-tooltip-class='av-tt-large-width av-tt-pos-right av-tt-align-bottom  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Air flow sensor B (Slave)&lt;br \/&gt;\n&lt;\/strong&gt;&lt;br \/&gt;\nThe slave sensor is mounted on the other tunnel wall and aligned with the master.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>2<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><div class='av-image-hotspot av-1sdjj1-acfb43ea0b659104825e22fc4371566b av-image-hotspot-3 ' data-avia-tooltip-position='right' data-avia-tooltip-alignment='bottom' data-avia-tooltip-class='av-tt-large-width av-tt-pos-right av-tt-align-bottom  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Terminal box Master&lt;\/strong&gt;&lt;\/p&gt;\n&lt;p&gt;The terminal box on the master side is used to connect the power supply and the connections to the slave as well as the tunnel control system.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>3<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><div class='av-image-hotspot av-1n5dlx-c92b183e7f31a1d8e6628bb24a8a27a4 av-image-hotspot-4 ' data-avia-tooltip-position='top' data-avia-tooltip-alignment='left' data-avia-tooltip-class='av-tt-large-width av-tt-pos-above av-tt-align-left  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Terminal box Slave&lt;\/strong&gt;&lt;\/p&gt;\n&lt;p&gt;The connection box on the slave interconnects to the master&#8217;s terminal box.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>4<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><div class='av-image-hotspot av-1e9zx9-d10495dc1827bdc22ff4cd75c264b2ad av-image-hotspot-5 ' data-avia-tooltip-position='right' data-avia-tooltip-alignment='bottom' data-avia-tooltip-class='av-tt-large-width av-tt-pos-right av-tt-align-bottom  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Connection to the tunnel control system&lt;\/strong&gt;&lt;\/p&gt;\n&lt;p&gt;The tunnel control can be connected by analogue outputs and relay contacts or RS-485 MODBUS RTU.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>5<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><div class='av-image-hotspot av-16rcv9-aed20890552e3ce0c127b94826fc3fc9 av-image-hotspot-6 ' data-avia-tooltip-position='top' data-avia-tooltip-alignment='left' data-avia-tooltip-class='av-tt-large-width av-tt-pos-above av-tt-align-left  av-mobile-fallback-active  main_color av-tt-hotspot' data-avia-tooltip='&lt;p&gt;&lt;strong&gt;Touch operating unit (optional)&lt;\/strong&gt;&lt;\/p&gt;\n&lt;p&gt;The touch operating unit displays measured values and status. It can also be used to configure the system. One operating unit can connect up to 3 air flow monitoring systems.&lt;\/p&gt;\n'><div class='av-image-hotspot_inner'>6<\/div><div class='av-image-hotspot-pulse'><\/div><\/div><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-874 avia-img-lazy-loading-not-874 avia_image' src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?fit=1030%2C401&ssl=1\" alt='' title='FL_Grafik_2015-08-05'  height=\"401\" width=\"1030\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?w=3155&amp;ssl=1 3155w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=300%2C117&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=1030%2C401&amp;ssl=1 1030w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=1500%2C583&amp;ssl=1 1500w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=705%2C274&amp;ssl=1 705w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=450%2C175&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?resize=800%2C311&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/FL_Grafik_2015-08-05.png?w=3000&amp;ssl=1 3000w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/div><\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-1 '><div class=\"av-hotspot-fallback-tooltip-count\">1<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Air flow sensor A (Master)<\/strong><\/p>\n<p>The master sensor is mounted on one tunnel wall and aligned with the slave on the opposite wall.<\/p>\n<\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-2 '><div class=\"av-hotspot-fallback-tooltip-count\">2<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Air flow sensor B (Slave)<br \/>\n<\/strong><br \/>\nThe slave sensor is mounted on the other tunnel wall and aligned with the master.<\/p>\n<\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-3 '><div class=\"av-hotspot-fallback-tooltip-count\">3<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Terminal box Master<\/strong><\/p>\n<p>The terminal box on the master side is used to connect the power supply and the connections to the slave as well as the tunnel control system.<\/p>\n<\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-4 '><div class=\"av-hotspot-fallback-tooltip-count\">4<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Terminal box Slave<\/strong><\/p>\n<p>The connection box on the slave interconnects to the master&#8217;s terminal box.<\/p>\n<\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-5 '><div class=\"av-hotspot-fallback-tooltip-count\">5<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Connection to the tunnel control system<\/strong><\/p>\n<p>The tunnel control can be connected by analogue outputs and relay contacts or RS-485 MODBUS RTU.<\/p>\n<\/div><\/div><div class='av-hotspot-fallback-tooltip av-image-hotspot-6 '><div class=\"av-hotspot-fallback-tooltip-count\">6<div class=\"avia-arrow\"><\/div><\/div><div class=\"av-hotspot-fallback-tooltip-inner clearfix\"><p>\n<strong>Touch operating unit (optional)<\/strong><\/p>\n<p>The touch operating unit displays measured values and status. It can also be used to configure the system. One operating unit can connect up to 3 air flow monitoring systems.<\/p>\n<\/div><\/div><\/div><\/p><\/div><div  class='flex_column av-5p0ff1-297e6ddb673639b610743044cbca6d3f av_one_fourth  avia-builder-el-9  el_after_av_three_fourth  el_before_av_one_full  flex_column_div  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-5mcnvx-b94d84533f86efa55a9301594be83845\">\n#top .av-special-heading.av-5mcnvx-b94d84533f86efa55a9301594be83845{\npadding-bottom:0;\n}\nbody .av-special-heading.av-5mcnvx-b94d84533f86efa55a9301594be83845 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-5mcnvx-b94d84533f86efa55a9301594be83845 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-5mcnvx-b94d84533f86efa55a9301594be83845 av-special-heading-h3  avia-builder-el-10  el_before_av_promobox  avia-builder-el-first '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Request quotation<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<div  class='av_promobox av-5ch9wl-a76e1627d7c98522e91a8630ffaacff7 avia-button-no  avia-builder-el-11  el_after_av_heading  el_before_av_button_big  avia-builder-el-last '><div class='avia-promocontent'><p>\nWould you like to request a quote for any of our products or services?<\/p>\n<p>Please click below and leave your details. We will contact you as soon as possible.<\/p>\n<\/div><\/div><br \/>\n<div  class='avia-button-wrap avia-button-center  avia-builder-el-12  el_after_av_promobox  el_before_av_hr '>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-5902yl-29fa83709e1687a526ecb42e958cf63e\">\n#top #wrap_all .avia-button.av-5902yl-29fa83709e1687a526ecb42e958cf63e:hover{\ncolor:#ffffff;\ntransition:all 0.4s ease-in-out;\n}\n#top #wrap_all .avia-button.av-5902yl-29fa83709e1687a526ecb42e958cf63e:hover .avia-svg-icon svg:first-child{\nfill:#ffffff;\nstroke:#ffffff;\n}\n<\/style>\n<a href='https:\/\/www.tunnelsicherheit.at\/en\/contact\/inquiry\/' class='avia-color-theme-color avia-button avia-button-fullwidth av-5902yl-29fa83709e1687a526ecb42e958cf63e avia-icon_select-no avia-color-theme-color'   aria-label=\"Request\"><span class='avia_iconbox_title' >Request<\/span><span class='avia_button_background avia-button avia-button-fullwidth avia-color-theme-color'><\/span><\/a><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-be9hp-9562fe3f3724cd9c2cd5568fc5898dc7\">\n#top .hr.hr-invisible.av-be9hp-9562fe3f3724cd9c2cd5568fc5898dc7{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-be9hp-9562fe3f3724cd9c2cd5568fc5898dc7 hr-invisible  avia-builder-el-13  el_after_av_button_big  el_before_av_heading  avia-builder-el-first '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3oe1d1-5af021325826d96c7d41ad9b7bf934ff\">\n#top .av-special-heading.av-3oe1d1-5af021325826d96c7d41ad9b7bf934ff{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-3oe1d1-5af021325826d96c7d41ad9b7bf934ff .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-3oe1d1-5af021325826d96c7d41ad9b7bf934ff .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-3oe1d1-5af021325826d96c7d41ad9b7bf934ff av-special-heading-h3  avia-builder-el-14  el_after_av_hr  el_before_av_font_icon '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Downloads<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3jztdh-813863d8efd5675d0507100bc2ce2c6b\">\n.av_font_icon.av-3jztdh-813863d8efd5675d0507100bc2ce2c6b .av-icon-char{\nfont-size:25px;\nline-height:25px;\nwidth:25px;\n}\n<\/style>\n<span  class='av_font_icon av-3jztdh-813863d8efd5675d0507100bc2ce2c6b avia_animate_when_visible av-icon-style-border avia-icon-pos-center avia-iconfont avia-font-entypo-fontello av-no-color avia-icon-animate'><a href='https:\/\/doc.tunnelsafety.at\/tFL-USX-datasheet_DE'   class='av-icon-char' data-av_icon='\ue84b' data-av_iconfont='entypo-fontello' aria-hidden=\"false\" ><\/a><span class='av_icon_caption av-special-font'>Datenblatt DE (PDF)<\/span><\/span><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3g7r85-c7f026decedf22e46c6c051defdffbb3\">\n#top .hr.hr-invisible.av-3g7r85-c7f026decedf22e46c6c051defdffbb3{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-3g7r85-c7f026decedf22e46c6c051defdffbb3 hr-invisible  avia-builder-el-16  el_after_av_font_icon  el_before_av_font_icon '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3akb5h-511007cc944712304ecf5c5ba611bba7\">\n.av_font_icon.av-3akb5h-511007cc944712304ecf5c5ba611bba7 .av-icon-char{\nfont-size:25px;\nline-height:25px;\nwidth:25px;\n}\n<\/style>\n<span  class='av_font_icon av-3akb5h-511007cc944712304ecf5c5ba611bba7 avia_animate_when_visible av-icon-style-border avia-icon-pos-center avia-iconfont avia-font-entypo-fontello av-no-color avia-icon-animate'><a href='https:\/\/doc.tunnelsafety.at\/tFL-USX-datasheet_EN'   class='av-icon-char' data-av_icon='\ue84b' data-av_iconfont='entypo-fontello' aria-hidden=\"false\" ><\/a><span class='av_icon_caption av-special-font'>Datasheet EN (PDF)<\/span><\/span><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-31f3at-6e7dc36a21444e70a44893139e70f5d8\">\n#top .hr.hr-invisible.av-31f3at-6e7dc36a21444e70a44893139e70f5d8{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-31f3at-6e7dc36a21444e70a44893139e70f5d8 hr-invisible  avia-builder-el-18  el_after_av_font_icon  el_before_av_heading '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-wdxyt-45d3dcd8cd40674d76c0d3b95a22b6cd\">\n#top .av-special-heading.av-wdxyt-45d3dcd8cd40674d76c0d3b95a22b6cd{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-wdxyt-45d3dcd8cd40674d76c0d3b95a22b6cd .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-wdxyt-45d3dcd8cd40674d76c0d3b95a22b6cd .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-wdxyt-45d3dcd8cd40674d76c0d3b95a22b6cd av-special-heading-h3  avia-builder-el-19  el_after_av_hr  el_before_av_gallery '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Gallery<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-qpt79-4002de6846e93f72487c7529428b6764\">\n#top .avia-gallery.av-qpt79-4002de6846e93f72487c7529428b6764 .avia-gallery-thumb a{\nwidth:50%;\n}\n<\/style>\n<div  class='avia-gallery av-qpt79-4002de6846e93f72487c7529428b6764 avia_animate_when_visible  avia-builder-el-20  el_after_av_heading  avia-builder-el-last  avia_lazyload avia-gallery-animate avia-gallery-1'  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><meta itemprop=\"contentURL\" content=\"https:\/\/www.tunnelsicherheit.at\/en\/product\/tfl-us-air-flow-measuring-system-ultrasonic\/\"><div class='avia-gallery-thumb'><a href=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?fit=813%2C1030&amp;ssl=1\" data-srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?w=1242&amp;ssl=1 1242w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=237%2C300&amp;ssl=1 237w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=813%2C1030&amp;ssl=1 813w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=1184%2C1500&amp;ssl=1 1184w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=556%2C705&amp;ssl=1 556w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=450%2C570&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=800%2C1014&amp;ssl=1 800w\" data-sizes=\"(max-width: 813px) 100vw, 813px\" data-rel='gallery-1' data-prev-img='https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=495%2C400&ssl=1' class='first_thumb lightbox ' data-onclick='1' title='D-FL220T Sensor'  itemprop=\"thumbnailUrl\"  ><img decoding=\"async\" fetchpriority=\"high\" class=\"wp-image-878 avia-img-lazy-loading-not-878\"  data-avia-tooltip='D-FL220T Sensor' src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=80%2C80&ssl=1\" width=\"80\" height=\"80\"  title='D-FL220T Sensor' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=80%2C80&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=36%2C36&amp;ssl=1 36w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=180%2C180&amp;ssl=1 180w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=120%2C120&amp;ssl=1 120w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=450%2C450&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?zoom=3&amp;resize=80%2C80&amp;ssl=1 240w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><div class='big-prev-fake'><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-878 avia-img-lazy-loading-878\"  width=\"495\" height=\"400\" src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=495%2C400&ssl=1\" title='D-FL220T Sensor' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=495%2C400&amp;ssl=1 495w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?resize=845%2C684&amp;ssl=1 845w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/D-FL220T.png?zoom=2&amp;resize=495%2C400&amp;ssl=1 990w\" sizes=\"auto, (max-width: 495px) 100vw, 495px\" \/><\/div><\/a><a href=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?fit=1030%2C773&amp;ssl=1\" data-srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?w=2048&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=1030%2C773&amp;ssl=1 1030w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=1500%2C1125&amp;ssl=1 1500w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=705%2C529&amp;ssl=1 705w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=450%2C338&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=800%2C600&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?w=1200&amp;ssl=1 1200w\" data-sizes=\"(max-width: 1030px) 100vw, 1030px\" data-rel='gallery-1' data-prev-img='https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=495%2C400&ssl=1' class='lightbox ' data-onclick='2' title='D-FL 220T mounted on tunnel wall'  itemprop=\"thumbnailUrl\"  ><img decoding=\"async\" fetchpriority=\"high\" class=\"wp-image-880 avia-img-lazy-loading-not-880\"  data-avia-tooltip='D-FL 220T mounted on tunnel wall' src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=80%2C80&ssl=1\" width=\"80\" height=\"80\"  title='D-FL 220T an Tunnelulm montiert' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=80%2C80&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=36%2C36&amp;ssl=1 36w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=180%2C180&amp;ssl=1 180w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=120%2C120&amp;ssl=1 120w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=450%2C450&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?zoom=3&amp;resize=80%2C80&amp;ssl=1 240w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><div class='big-prev-fake'><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-880 avia-img-lazy-loading-880\"  width=\"495\" height=\"400\" src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=495%2C400&ssl=1\" title='D-FL 220T an Tunnelulm montiert' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=495%2C400&amp;ssl=1 495w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?resize=845%2C684&amp;ssl=1 845w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?zoom=2&amp;resize=495%2C400&amp;ssl=1 990w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2015\/08\/IMG_0028.jpg?zoom=3&amp;resize=495%2C400&amp;ssl=1 1485w\" sizes=\"auto, (max-width: 495px) 100vw, 495px\" \/><\/div><\/a><a href=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?fit=1030%2C646&amp;ssl=1\" data-srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?w=3350&amp;ssl=1 3350w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=300%2C188&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=1030%2C646&amp;ssl=1 1030w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=768%2C481&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=1536%2C963&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=2048%2C1284&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=1500%2C940&amp;ssl=1 1500w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=705%2C442&amp;ssl=1 705w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=800%2C501&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?w=3000&amp;ssl=1 3000w\" data-sizes=\"(max-width: 1030px) 100vw, 1030px\" data-rel='gallery-1' data-prev-img='https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=495%2C400&ssl=1' class='first_thumb lightbox ' data-onclick='3' title='t\/FL-US-TB-A Terminal Box A'  itemprop=\"thumbnailUrl\"  ><img decoding=\"async\" fetchpriority=\"high\" class=\"wp-image-3554 avia-img-lazy-loading-not-3554\"  data-avia-tooltip='t\/FL-US-TB-A Terminal Box A' src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=80%2C80&ssl=1\" width=\"80\" height=\"80\"  title='smartAQM-TBX_perspektive' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=80%2C80&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=36%2C36&amp;ssl=1 36w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=180%2C180&amp;ssl=1 180w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=600%2C600&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?zoom=3&amp;resize=80%2C80&amp;ssl=1 240w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><div class='big-prev-fake'><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-3554 avia-img-lazy-loading-3554\"  width=\"495\" height=\"400\" src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=495%2C400&ssl=1\" title='smartAQM-TBX_perspektive' alt='' srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=495%2C400&amp;ssl=1 495w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?resize=845%2C684&amp;ssl=1 845w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?zoom=2&amp;resize=495%2C400&amp;ssl=1 990w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM-TBX_perspektive.png?zoom=3&amp;resize=495%2C400&amp;ssl=1 1485w\" sizes=\"auto, (max-width: 495px) 100vw, 495px\" \/><\/div><\/a><\/div><\/div><\/p><\/div><div  class='flex_column av-28zbp-3e9c683d2542d84bebc794ad4c964d93 av_one_full  avia-builder-el-21  el_after_av_one_fourth  avia-builder-el-last  first flex_column_div  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-fxey5-1f88d5447ad5acbe84c539491804c540\">\n#top .av-special-heading.av-fxey5-1f88d5447ad5acbe84c539491804c540{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-fxey5-1f88d5447ad5acbe84c539491804c540 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-fxey5-1f88d5447ad5acbe84c539491804c540 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-fxey5-1f88d5447ad5acbe84c539491804c540 av-special-heading-h3  avia-builder-el-22  el_before_av_portfolio  avia-builder-el-no-sibling '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Related products<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<div  id=\"av-sc-portfolio-1\"  class=' grid-sort-container isotope   no_margin-container with-title-container grid-total-even 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no_margin post-entry post-entry-3607 grid-entry-overview grid-loop-2 grid-parity-even  air_sort  av_one_fourth  default_av_fullwidth '><article class='main_color inner-entry'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><a href=\"https:\/\/www.tunnelsicherheit.at\/en\/product\/smart-aqm-air-quality-monitor\/\" title='smart\/AQM Air Quality Monitor'  data-rel='grid-1' class='grid-image avia-hover-fx'> <img decoding=\"async\" fetchpriority=\"high\" width=\"260\" height=\"185\" src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM_Portfolio.png?resize=260%2C185&amp;ssl=1\" class=\"wp-image-3594 avia-img-lazy-loading-not-3594 attachment-portfolio_small size-portfolio_small wp-post-image\" alt=\"\" srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2021\/08\/smartAQM_Portfolio.png?w=450&amp;ssl=1 450w, 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'><article class='main_color inner-entry'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><a href=\"https:\/\/www.tunnelsicherheit.at\/en\/product\/t-fl-dp-air-flow-monitoring-system-differential-pressure\/\" title='t\/FL-DP Air flow monitoring system &#8211; Differential pressure'  data-rel='grid-1' class='grid-image avia-hover-fx'> <img decoding=\"async\" fetchpriority=\"high\" width=\"260\" height=\"185\" src=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2018\/09\/tFL-DP_Portfolio.jpg?resize=260%2C185&amp;ssl=1\" class=\"wp-image-2179 avia-img-lazy-loading-not-2179 attachment-portfolio_small size-portfolio_small wp-post-image\" alt=\"\" srcset=\"https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2018\/09\/tFL-DP_Portfolio.jpg?w=450&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2018\/09\/tFL-DP_Portfolio.jpg?resize=300%2C213&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.tunnelsicherheit.at\/wp-content\/uploads\/2018\/09\/tFL-DP_Portfolio.jpg?resize=260%2C185&amp;ssl=1 260w\" sizes=\"(max-width: 260px) 100vw, 260px\" data-wp-pid=\"2179\" \/><\/a><div class='grid-content'><div class='avia-arrow'><\/div><header class=\"entry-content-header\" aria-label=\"Portfolio: t\/FL-DP Air flow monitoring system &#8211; Differential pressure\"><h3 class='grid-entry-title entry-title '  itemprop=\"headline\" ><a href='https:\/\/www.tunnelsicherheit.at\/en\/product\/t-fl-dp-air-flow-monitoring-system-differential-pressure\/' title='t\/FL-DP Air flow monitoring system &#8211; Differential pressure'>t\/FL-DP Air flow monitoring system &#8211; Differential pressure<\/a><\/h3><\/header><\/div><footer class=\"entry-footer\"><\/footer><\/article><\/div><\/div><\/p><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":851,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"tags":[149,33,148,25,167,169,168,157,160],"portfolio_entries":[119],"class_list":["post-690","portfolio","type-portfolio","status-publish","has-post-thumbnail","hentry","tag-air-flow-sensor","tag-air-velocity","tag-air-velocity-sensor","tag-flow","tag-flow-direction","tag-flow-probe","tag-flow-sensor","tag-rabt-2006-en","tag-rvs-09-02-22-en","portfolio_entries-air"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>t\/FL-USX Air flow monitoring system - Ultrasonic cross-section - JES tunnelsafety.at<\/title>\n<meta name=\"description\" content=\"The air flow monitoring system t\/FL-US accurately and reliably measures the average air velocity 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