{"id":16493,"date":"2024-12-21T18:28:42","date_gmt":"2024-12-21T15:28:42","guid":{"rendered":"https:\/\/eurosenstelematics.com\/news\/calibration-of-the-axle-load-sensors\/"},"modified":"2025-04-09T18:57:45","modified_gmt":"2025-04-09T15:57:45","slug":"calibration-of-the-axle-load-sensors","status":"publish","type":"news","link":"https:\/\/eurosenstelematics.com\/en\/news\/calibration-of-the-axle-load-sensors\/","title":{"rendered":"Calibration of the axle load sensors"},"content":{"rendered":"<p>Sensor calibration process always raises a number of questions. Below you\u2019ll find a thorough step-by-step calibration guide for any type of Mechatronics axle load sensors: Eurosens DDS, DPS or DSS.<br \/>\nLet\u2019s take a semitrailer truck with air spring suspension as an example. To calibrate the sensors, truck scales are a must: either platform scales or axial weighing pads. The below guide describes the calibration process using platform scales.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-16493 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/eurosenstelematics.com\/en\/axle-load-sensor-calibration\/v1\/'><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"349\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V1-400x349.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/eurosenstelematics.com\/en\/axle-load-sensor-calibration\/v2\/'><img decoding=\"async\" width=\"400\" height=\"400\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V2-400x400.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>The truck has two independent suspension circuits. The same is true for the semitrailer. Thus, they have the same type and number of axle load sensors installed: one <a href=\"https:\/\/eurosenstelematics.com\/en\/home-page\/products\/onboard-weighing-systems\/eurosens-dps\/\" target=\"_blank\" rel=\"noopener\">Eurosens DPS<\/a> axle load sensor on each suspension circuit for a truck (two sensors in total), and two Eurosens DPS for a semitrailer \u2013 one on each suspension circuit. To begin with, let\u2019s measure the actual axle load on each axle.<\/p>\n<ol>\n<li>Drive the truck front axle on the scales and measure the actual axle load on the front axle <strong>N1<\/strong> (kg). The output value of the left circuit sensor mark as <strong>Sens1L<\/strong>. <strong>Sens1R<\/strong> will have the output value of the right sensor.<\/li>\n<\/ol>\n<div id=\"attachment_10335\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-10335\" class=\"wp-image-10335 size-medium\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-600x319.png\" alt=\"\" width=\"600\" height=\"319\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-600x319.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-768x409.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-450x239.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-1000x532.png 1000w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4-200x106.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V4.png 1428w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-10335\" class=\"wp-caption-text\">The first step in front axle calibration<\/p>\n<p><\/p><\/div>\n<p>2. Further, we need to measure the actual axle load of the truck rear axle. The axle is paired and one axle can\u2019t be put on scales, so we\u2019ll measure the total load N2 (kg) of the paired axle. Also, we\u2019ll assume that the individual load of each of the paired axle is equal. Record the output value of the left loop sensor <strong>Sens2L<\/strong> and the right loop sensor <strong>Sens2R<\/strong> (they will differ slightly from the first measurement data). Record the readings of the scales <strong>N2<\/strong>.<\/p>\n<div id=\"attachment_10341\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10341\" class=\"wp-image-10341 size-medium\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5-600x379.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5-600x379.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5-768x486.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5-450x285.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5-200x126.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V5.png 974w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-10341\" class=\"wp-caption-text\">First calibration point for tractor rear axles<\/p><\/div>\n<p>3.Let\u2019s move on to the trailer axles. Measure the total axle load <strong>N3<\/strong> (kg) by placing the axle on the platform scales. Here, the individual loads can not be measured too. Thus, we\u2019ll again suppose that they are equal.<\/p>\n<div id=\"attachment_10343\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10343\" class=\"size-medium wp-image-10343\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-600x379.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-600x379.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-768x486.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-450x285.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-200x126.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3.png 974w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-10343\" class=\"wp-caption-text\">First calibration point of trailer axles<\/p><\/div>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>Mark the output sensor value of the trailer left circuit as <strong>Sens3L<\/strong> and <strong>Sens3R<\/strong> for the right.<br \/>\nAs soon as we are done with the measurements, let\u2019s proceed to the GPS tracking software and create a calibration table adding the first calibration point:<br \/>\n<strong>Axle 1 (left side): <\/strong>input value <strong>Sens1L<\/strong>; output value <strong>N1<\/strong><br \/>\n<strong>Axle 1 (right side):<\/strong> <strong>Sens1R;<\/strong> <strong>N1<\/strong><br \/>\nSince the output sensor value for the truck front axle was measured individually, the axle load is calculated as the average of the load values.<br \/>\n<strong>Load_axle1<\/strong>=<strong>(Axle 1 (left side) + Axle 1 (right side))\/2<\/strong><\/p>\n<p>To calculate the load for the second and the third axles, divide the actual measured load by 2, equally for each of the axles.<br \/>\n<strong>Axle 2 (left side)<\/strong>: <strong>Sens2L<\/strong>; <strong>N2\/2<\/strong><br \/>\n<strong>Axis 2 (right side):<\/strong> <strong>Sens2R<\/strong>; <strong>N2\/2<\/strong><br \/>\n<strong>Axis 3 (left side):<\/strong> <strong>Sens2L<\/strong>; <strong>N2\/2<\/strong><br \/>\n<strong>Axis 3 (right side):<\/strong> <strong>Sens2R<\/strong>; <strong>N2\/2<\/strong><br \/>\n<strong>Load_axle2<\/strong>=<strong>(Axle 2(left side)<\/strong> + <strong>Axle 2(right side))\/2<\/strong><\/p>\n<p><strong>Load_axle3<\/strong>=(<strong>Axle 3(left side)<\/strong> + <strong>Axle 3(right side)<\/strong>)\/2<\/p>\n<p>Follow the same algorithm for the semitrailer:<br \/>\n<strong>Axis_t_1 (left side) : <\/strong> <strong>Sens3L; <\/strong> <strong>N3\/3<\/strong><br \/>\n<strong>Axis_t_1 (right side): <\/strong> <strong> Sens3R; <\/strong> <strong> N3\/3<\/strong><br \/>\n<strong>Axis_t_2 (left side) : <\/strong> <strong>Sens3L; <\/strong> <strong>N3\/3<\/strong><br \/>\n<strong>Axis_t_2 (right side): <\/strong> <strong> Sens3R; <\/strong> <strong>N3\/3<\/strong><br \/>\n<strong>Axis_t_3 (left side) : <\/strong> <strong>Sens3L; <\/strong> <strong>N3\/3<\/strong><\/p>\n<p><strong>Axis_t_3 (right side): <\/strong> <strong>Sens3R; <\/strong> <strong>N3\/3<\/strong><\/p>\n<p><strong>Axis_trailer_1<\/strong>=( <strong>Axis_t_1 (left side)<\/strong> + <strong>Axis_t_1 (right side)<\/strong> )\/2<br \/>\n<strong>Axis_trailer_2<\/strong>=( <strong>Axis_t_2 (left side) <\/strong> + <strong>Axis_t_2 (right side)<\/strong>)\/2<br \/>\n<strong>Axis_trailer_3<\/strong>=( <strong>Axis_t_3 (left side) <\/strong> + <strong>Axis_t_3 (right side)<\/strong>)\/2<\/p>\n<\/div>\n<\/div>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>To calibrate the sensor, we need to make a calibration table with at least two calibration points: empty and full (fully-loaded). If possible, add more calibration points to increase the accuracy of sensor readings.<\/p>\n<\/div>\n<\/div>\n<p>The calibration table is programmed either by the sensor itself or on the server side (for example, in sensor properties in Wialon). The server-side calibration can be done remotely, it does not require a direct wired connection to the sensor.<\/p>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>Just like for air suspension, when using DSS load cells we need at least one more point in the calibration tables of all created sensors.<\/p>\n<\/div>\n<\/div>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>The calibration table is programmed either by the sensor itself or on the server side (for example, in sensor properties in Wialon). The server-side calibration can be done remotely, it does not require a direct wired connection to the sensor.<\/p>\n<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10347 aligncenter\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6-600x202.png\" alt=\"\" width=\"600\" height=\"202\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6-600x202.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6-768x259.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6-450x152.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6-200x67.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V6.png 992w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<\/div>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>Server-based calibration is convenient because it does not require a connection to the sensor. This means it can be done remotely. The output values of the sensors <strong>(Sens)<\/strong> are visible in the monitoring system, all that is required for calibration is to measure the actual axle loads <strong>N<\/strong> using scales as shown above. In this way, the vehicle can be calibrated in the normal course of business when transporting various loads.<\/p>\n<\/div>\n<\/div>\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>The sensor-side calibration is possible if the axle load sensors are connected to an on-board display, such as <a href=\"https:\/\/eurosenstelematics.com\/en\/home-page\/products\/onboard-displays\/\" target=\"_blank\" rel=\"noopener\">Eurosens Display CAN<\/a>. The display will calculate axle loads values in tons directly onboard.<\/p>\n<\/div>\n<\/div>\n<p>To perform the calibration onboard:<\/p>\n<ul>\n<li>Measure the axle loads several times using the truck scales. (with different weights)<\/li>\n<li>Stay connected to the sensor during the measurements.<\/li>\n<li>Enter the weight values of the truck scales in the field \u201cLoad, kg\u201d.<\/li>\n<li>After each measurement, add a line to the calibration table by pressing the \u201cCalibrate\u201d button.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10349 aligncenter\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V7-600x431.png\" alt=\"\" width=\"600\" height=\"431\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V7-600x431.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V7-450x324.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V7-200x144.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V7.png 619w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>As soon as you are ready with that, enter the current value of the detector together with the measured axle load to the calibration table. You can fill in the table partly, saving the intermediate results to the sensor.<\/p>\n<p><strong>Calibration tips for using weighing scales with a long platform.<\/strong><\/p>\n<p>Platform scales with a long platform to weigh the entre road-train are a bit more difficult to deal with. If the front axle load measurement is done as mentioned above, the remaining axles measurement needs the entire vehicle weighing.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10351 aligncenter\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-600x379.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-600x379.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-768x485.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-450x284.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-1000x632.png 1000w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8-200x126.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V8.png 1024w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<div class=\"elementor-element elementor-element-48f9e15 xts-scheme-inherit xts-textalign-inherit elementor-widget elementor-widget-text-editor\" data-id=\"48f9e15\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>Then subtract the front axle load from the entire vehicle load. Measure the trailer axle loads.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"elementor-element elementor-element-a957d92 elementor-widget elementor-widget-image\" data-id=\"a957d92\" data-element_type=\"widget\" data-widget_type=\"image.default\"><\/div>\n<div data-id=\"a957d92\" data-element_type=\"widget\" data-widget_type=\"image.default\"><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10345 aligncenter\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1-600x379.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1-600x379.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1-768x486.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1-450x285.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1-200x126.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V3-1.png 974w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<div data-id=\"a957d92\" data-element_type=\"widget\" data-widget_type=\"image.default\"><\/div>\n<p>The platform scales should preferably be installed on the same level with the road surface. A high ramp increases the measurement error when a vehicle enters the scales.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10355 aligncenter\" src=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-600x379.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-600x379.png 600w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-768x485.png 768w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-450x284.png 450w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-1000x632.png 1000w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10-200x126.png 200w, https:\/\/eurosenstelematics.com\/wp-content\/uploads\/2022\/12\/V10.png 1024w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<div class=\"xts-site-wrapper\">\n<div class=\"xts-site-content\">\n<div class=\"container\">\n<div class=\"row row-spacing-40 xts-sidebar-hidden-md\">\n<div class=\"elementor elementor-10299\" data-elementor-type=\"wp-post\" data-elementor-id=\"10299\">\n<section class=\"xts-negative-gap elementor-section elementor-top-section elementor-element elementor-element-6a0fe95 elementor-section-boxed elementor-section-height-default elementor-section-height-default xts-section-disabled\" data-id=\"6a0fe95\" data-element_type=\"section\">\n<div class=\"elementor-container elementor-column-gap-default\">\n<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-80eab5b\" data-id=\"80eab5b\" data-element_type=\"column\">\n<div class=\"elementor-widget-wrap elementor-element-populated\">\n<div class=\"elementor-element elementor-element-9b65292 xts-scheme-inherit xts-textalign-inherit elementor-widget elementor-widget-text-editor\" data-id=\"9b65292\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<p>The scales above are unpreferable for calibration, the ones below on the same level with the road are okay.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<footer class=\"xts-footer xts-scheme-default xts-with-html_block\"><\/footer>\n<\/div>\n<div class=\"xts-close-side xts-fill\"><\/div>\n<div><\/div>\n","protected":false},"featured_media":10334,"template":"","meta":{"_acf_changed":false},"eurosens-category":[509],"metka":[494,493,495,496],"class_list":["post-16493","news","type-news","status-publish","has-post-thumbnail","hentry","eurosens-category-axle-load-sensors","metka-eurosens-dds","metka-eurosens-dps","metka-eurosens-dss","metka-496"],"acf":[],"_links":{"self":[{"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/news\/16493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/types\/news"}],"version-history":[{"count":0,"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/news\/16493\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/media\/10334"}],"wp:attachment":[{"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/media?parent=16493"}],"wp:term":[{"taxonomy":"eurosens-category","embeddable":true,"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/eurosens-category?post=16493"},{"taxonomy":"metka","embeddable":true,"href":"https:\/\/eurosenstelematics.com\/en\/wp-json\/wp\/v2\/metka?post=16493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}