{"id":8051,"date":"2026-08-24T19:03:35","date_gmt":"2026-08-25T03:03:35","guid":{"rendered":"https:\/\/szlmi.com\/?p=8051"},"modified":"2026-08-24T19:08:07","modified_gmt":"2026-08-25T03:08:07","slug":"seezol-oil-pressure-sensor-installation-guide-for-load-moment-indicators-onboard-weighing-systems","status":"publish","type":"post","link":"https:\/\/szlmi.com\/ru\/seezol-oil-pressure-sensor-installation-guide-for-load-moment-indicators-onboard-weighing-systems\/","title":{"rendered":"SeeZol Oil Pressure Sensor Installation Guide for Load Moment Indicators &#038; Onboard Weighing Systems"},"content":{"rendered":"<h2>1. Overview<\/h2>\n<p>The <a href=\"https:\/\/szlmi.com\/load-moment-indicator-lmi-for-cranes-heavy-machinery\/\">\u0418\u043d\u0434\u0438\u043a\u0430\u0442\u043e\u0440 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438<\/a> (LMI, also called a moment limiter) and the <a href=\"https:\/\/szlmi.com\/onboard-weighing-system-for-heavy-machinery\/\">Onboard Weighing System<\/a> are critical devices that keep excavators, loaders, truck cranes and other hydraulic engineering machines operating safely and efficiently. seezol Technology&#8217;s measurement principle is to install oil pressure sensors on the hydraulic circuit to capture cylinder working pressure in real time, then convert it \u2014 through a calibrated algorithm \u2014 into the current load mass and resultant moment, enabling overload warning and limiting.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-8052 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/\u5fae\u4fe1\u56fe\u7247_20251105150003.webp\" alt=\"\" width=\"600\" height=\"500\" \/><\/p>\n<p><a href=\"https:\/\/szlmi.com\/product\/hydraulic-pressure-sensor\/\">SeeZol oil pressure sensors<\/a> ship with a unified 1\/4-inch interface. This standardization means the field work is reduced to bridging the sensor&#8217;s 1\/4 end to the machine&#8217;s hydraulic end, which greatly simplifies model selection and spare-parts management.<\/p>\n<h2>2. Three Installation Methods by Hydraulic Line Connection Type<\/h2>\n<p>Depending on how the machine&#8217;s hydraulic lines are joined, field installation of the oil pressure sensor falls into three categories.<\/p>\n<h3>2.1 Tee-Joint Installation (threaded connection machines)<\/h3>\n<p><img decoding=\"async\" class=\"size-full wp-image-8053 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/WhatsApp-Image-2026-07-04-at-1.29.33-PM.webp\" alt=\"\" width=\"600\" height=\"750\" \/><\/p>\n<p><strong>Applies to:<\/strong> machines whose hydraulic pipes connect by threaded butt joints.<\/p>\n<p><strong>\u041f\u0440\u0438\u043d\u0446\u0438\u043f:<\/strong> A tee fitting is added at the original threaded joint, paralleling the oil pressure sensor into the circuit for pressure sampling without interrupting the main flow.<\/p>\n<p><strong>Steps:<\/strong><\/p>\n<ol>\n<li><strong>Measure the original joint thread.<\/strong> This is the most critical step \u2014 accurately measure the specification of both original threads (metric M, BSP\/G, NPT, etc., with exact dimensions) and select a tee whose top and bottom ends match exactly.<\/li>\n<\/ol>\n<ol>\n<li><strong>Handle the side port.<\/strong> The tee&#8217;s side port can either take an adapted 1\/4 adapter to connect the oil pressure sensor directly, or be welded with the 1\/4 elbow connector supplied by seezol before the sensor is screwed in.<\/li>\n<\/ol>\n<p><strong>\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435:<\/strong> Thread selection must be based on measurement; wrong selection causes seal failure.<\/p>\n<h3>2.2 Flange Installation (clamp \/ quick-coupler machines)<\/h3>\n<p><img decoding=\"async\" class=\"size-full wp-image-8054 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/Pressure-Sensor-1.webp\" alt=\"\" width=\"600\" height=\"750\" \/><\/p>\n<p><strong>Applies to:<\/strong> machines whose hydraulic pipes connect by clamp (quick coupler) joints.<\/p>\n<p><strong>\u041f\u0440\u0438\u043d\u0446\u0438\u043f:<\/strong> A dedicated flange is added at the clamp joint; the flange side carries a reserved 1\/4 sensor port.<\/p>\n<p><strong>Steps:<\/strong><\/p>\n<ol>\n<li>Measure the center-to-center spacing of the clamp&#8217;s four bolts and confirm the bolt thread size.<\/li>\n<\/ol>\n<ol>\n<li>Select or custom-make a matching flange from the measured data; its side carries a built-in 1\/4 port for the oil pressure sensor.<\/li>\n<\/ol>\n<p><strong>\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435:<\/strong> This method does not alter the clamp&#8217;s original seal structure \u2014 it only fixes the flange via the clamp&#8217;s bolt holes, giving a stable mount that is also easy to remove for maintenance.<\/p>\n<h3>2.3 Explosion-Proof Valve Installation (machines with burst valves)<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8055 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/\u5fae\u4fe1\u56fe\u7247_20260727113619_77_2.webp\" alt=\"\" width=\"600\" height=\"750\" \/><\/p>\n<p><strong>Applies to:<\/strong> machines whose hydraulic lines are equipped with an explosion-proof valve (also called a burst valve or balance valve).<\/p>\n<p><strong>\u041f\u0440\u0438\u043d\u0446\u0438\u043f:<\/strong> The explosion-proof valve normally reserves a main pressure-test port; the oil pressure sensor screws straight in, with no complex adapter needed.<\/p>\n<p><strong>Steps:<\/strong><\/p>\n<ol>\n<li>Locate the valve&#8217;s main pressure-test port.<\/li>\n<\/ol>\n<ol>\n<li>If the port is a standard 1\/4 interface, screw the oil pressure sensor in directly.<\/li>\n<\/ol>\n<ol>\n<li>If the port is non-standard, add a 1\/4 adapter interface first, then connect the sensor.<\/li>\n<\/ol>\n<p><strong>\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435:<\/strong> This is the simplest method, and because the test point is the system&#8217;s true pressure point, signal quality and response are excellent.<\/p>\n<h2>3. Mandatory Rule: Connector Dimensions Must Match Exactly<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8057 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/tee-joint-technician.webp\" alt=\"\" width=\"600\" height=\"500\" \/><\/p>\n<p>Whatever method is used, the first iron rule is: <strong>all connector dimensions must match exactly<\/strong>. A hydraulic line is a high-pressure sealed system, and any dimensional deviation must never be force-installed. Even a hairline mismatch force-threaded in leaves the threads under-engaged, breaking the seal and causing oil seepage. Seepage not only distorts the pressure sample and ruins measurement accuracy, it can also spray under high pressure and create a safety hazard; meanwhile force installation easily damages the machine&#8217;s original fittings, leading to costly repairs. Therefore, whenever dimensions are in doubt, always follow the sequence: <strong>measure first, select second, install last<\/strong>.<\/p>\n<h2>4. Sensor Position and Orientation<\/h2>\n<p>Position and orientation are based on ease of oil-pressure signal-cable routing, following these principles:<\/p>\n<ul>\n<li>Prefer <strong>inner-end mounting<\/strong> \u2014 place the sensor on the inner side of the structure to reduce exposure to impact.<\/li>\n<\/ul>\n<ul>\n<li>Fully assess the working range of the boom (arm) during operation; ensure that neither the machine body nor external obstacles can scrape the sensor or cable in any posture.<\/li>\n<\/ul>\n<ul>\n<li>Orient the sensor to favor cable exit, avoiding wrap-around by rotating or extending parts.<\/li>\n<\/ul>\n<h2>5. Signal Cable Protection and Routing<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8058 aligncenter\" src=\"https:\/\/szlmi.com\/wp-content\/uploads\/2026\/08\/precaution-cable-routing.webp\" alt=\"\" width=\"600\" height=\"500\" \/><\/p>\n<p>Job sites are harsh and cables are easily damaged; protect them as follows:<\/p>\n<ul>\n<li>Run the signal cable inside <strong>corrugated conduit<\/strong> throughout to resist abrasion, oil and impact.<\/li>\n<\/ul>\n<ul>\n<li>Route along the machine&#8217;s own hydraulic hoses, using existing channels and fixing points \u2014 neat and less likely to come loose.<\/li>\n<\/ul>\n<ul>\n<li>Leave <strong>appropriate slack<\/strong> so that boom lifting\/lowering, which stretches the hoses, does not pull the signal cable tight or snap it.<\/li>\n<\/ul>\n<h2>6. Limitations and Additional Notes<\/h2>\n<ul>\n<li>This guide is compiled from seezol Technology&#8217;s audit conclusions on typical models; special models or modified vehicles should be evaluated against their actual hydraulic circuits.<\/li>\n<\/ul>\n<ul>\n<li>After occupying the explosion-proof valve&#8217;s main test port, confirm it does not affect the valve&#8217;s original balancing and locking function.<\/li>\n<\/ul>\n<ul>\n<li>After installation, perform a pressure-hold and leak check before putting the load-measurement system into service.<\/li>\n<\/ul>\n<h2>7. Disclaimer<\/h2>\n<p>This technical guide is compiled by seezol Technology for reference by installation and maintenance personnel only. Installing pressure sensors involves high-pressure hydraulic systems; improper operation may cause personal injury or equipment loss. Actual work must be carried out by qualified personnel, strictly following the corresponding machine&#8217;s service manual and relevant safety standards. seezol Technology is not directly liable for any consequences arising from non-compliant operation.<\/p>","protected":false},"excerpt":{"rendered":"<p>The Load Moment Indicator (LMI, also called a moment limiter) and the Onboard Weighing System are critical devices that keep excavators, loaders, truck cranes and other hydraulic engineering machines operating safely and efficiently. seezol Technology&#8217;s measurement principle is to install oil pressure sensors on the hydraulic circuit to capture cylinder working pressure in real time, then convert it \u2014 through a calibrated algorithm \u2014 into the current load mass and resultant moment, enabling overload warning and limiting.<\/p>","protected":false},"author":1,"featured_media":8059,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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