{"id":31401,"date":"2026-08-19T22:05:15","date_gmt":"2026-08-19T14:05:15","guid":{"rendered":"https:\/\/www.chimaytech.net\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/"},"modified":"2026-08-19T22:05:15","modified_gmt":"2026-08-19T14:05:15","slug":"procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should","status":"publish","type":"post","link":"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/","title":{"rendered":"Procuring Online Turbidity Sensors for Reservoir Intake Protection: What Specifiers Should Require from Shanghai ChiMay"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Procuring_Online_Turbidity_Sensors_for_Reservoir_Intake_Protection_What_Specifiers_Should_Require_from_Shanghai_ChiMay\" >Procuring Online Turbidity Sensors for Reservoir Intake Protection: What Specifiers Should Require from Shanghai ChiMay<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Why_Reservoir_Intake_Turbidity_Demands_Continuous_Monitoring\" >Why Reservoir Intake Turbidity Demands Continuous Monitoring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Technology_Comparison_Nephelometric_vs_Ratio_vs_Forward_Scatter\" >Technology Comparison: Nephelometric vs. Ratio vs. Forward Scatter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Specification_Requirements_for_Reservoir_Intake_Applications\" >Specification Requirements for Reservoir Intake Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Deployment_Configuration_at_Reservoir_Intakes\" >Deployment Configuration at Reservoir Intakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Lifecycle_Cost_Comparison\" >Lifecycle Cost Comparison<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.chimaytech.net\/fr\/procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should\/#Where_This_Leaves_Specifiers\" >Where This Leaves Specifiers<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"procuring-online-turbidity-sensors-for-reservoir-intake-protection-what-specifiers-should-require-from-shanghai-chimay\"><span class=\"ez-toc-section\" id=\"Procuring_Online_Turbidity_Sensors_for_Reservoir_Intake_Protection_What_Specifiers_Should_Require_from_Shanghai_ChiMay\"><\/span>Procuring Online Turbidity Sensors for Reservoir Intake Protection: What Specifiers Should Require from Shanghai ChiMay<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>Sudden turbidity spikes exceeding <strong>100 NTU<\/strong> at reservoir intakes occur an average of <strong>6\u201312 times per year<\/strong> due to storm events, sediment resuspension, and algal bloom collapse, each requiring immediate treatment adjustments (<strong>AWWA Source Water Monitoring Survey, 2025<\/strong>). Online nephelometric turbidity sensors with <strong>860 nm near-infrared<\/strong> light source achieve measurement accuracy of <strong>\u00b12%<\/strong> of reading in the <strong>0\u20131,000 NTU<\/strong> range, with resolution down to <strong>0.01 NTU<\/strong> for early-stage event detection (<strong>ISO 7027-1:2016 standard<\/strong>). This article covers what specifiers should require in a procurement document.<\/p>\n<h2 id=\"why-reservoir-intake-turbidity-demands-continuous-monitoring\"><span class=\"ez-toc-section\" id=\"Why_Reservoir_Intake_Turbidity_Demands_Continuous_Monitoring\"><\/span>Why Reservoir Intake Turbidity Demands Continuous Monitoring<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Reservoir intakes are the first line of defense in drinking water treatment. Raw water turbidity at the intake directly determines the loading on coagulation, flocculation, and filtration processes. When turbidity spikes\u2014whether from storm-driven sediment runoff, wind-induced sediment resuspension, or collapsing algal blooms\u2014the treatment plant must respond immediately to maintain filtered water quality within regulatory limits.<\/p>\n<p>The <strong>US EPA&rsquo;s Surface Water Treatment Rule<\/strong> requires that filtration plants maintain filtered water turbidity below <strong>0.3 NTU<\/strong> (combined filter effluent) at all times. Exceeding this limit triggers mandatory corrective action and potential regulatory reporting. The key to compliance is knowing when raw water quality changes\u2014before it reaches the filters.<\/p>\n<p>According to the <strong>AWWA Source Water Monitoring Survey (2025)<\/strong>, which polled <strong>340 utilities<\/strong> across North America, sudden turbidity events at reservoir intakes are surprisingly common:<\/p>\n<ul>\n<li><strong>68%<\/strong> of utilities reported at least <strong>6 high-turbidity events (&gt;50 NTU)<\/strong> per year<\/li>\n<li><strong>34%<\/strong> experienced at least one event exceeding <strong>200 NTU<\/strong><\/li>\n<li>The median duration of elevated turbidity events was <strong>4\u201318 hours<\/strong><\/li>\n<li><strong>42%<\/strong> of events were not detected until treated water quality was affected<\/li>\n<\/ul>\n<p>These findings underscore the gap between manual sampling programs and the real-time information operators need to protect the treatment process.<\/p>\n<h2 id=\"technology-comparison-nephelometric-vs-ratio-vs-forward-scatter\"><span class=\"ez-toc-section\" id=\"Technology_Comparison_Nephelometric_vs_Ratio_vs_Forward_Scatter\"><\/span>Technology Comparison: Nephelometric vs. Ratio vs. Forward Scatter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Three primary optical technologies are used for online turbidity measurement in source water:<\/p>\n<table>\n<thead>\n<tr>\n<th>Technology<\/th>\n<th>Measurement Range<\/th>\n<th>Accuracy<\/th>\n<th>Best Suited For<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>90\u00b0 Nephelometric (860 nm)<\/strong><\/td>\n<td>0\u20131,000 NTU<\/td>\n<td>\u00b12% of reading<\/td>\n<td>General source water monitoring<\/td>\n<\/tr>\n<tr>\n<td><strong>Ratio (90\u00b0 + forward scatter)<\/strong><\/td>\n<td>0\u20134,000 NTU<\/td>\n<td>\u00b13% of reading<\/td>\n<td>High-turbidity storm events<\/td>\n<\/tr>\n<tr>\n<td><strong>Forward scatter<\/strong><\/td>\n<td>0\u20135,000 NTU<\/td>\n<td>\u00b15% of reading<\/td>\n<td>Industrial wastewater, very high loads<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For reservoir intake protection, the <strong>90\u00b0 nephelometric<\/strong> method (per ISO 7027-1:2016 and EPA Method 180.1) offers the best combination of sensitivity at low turbidity levels and adequate range for most storm events. This is the technology used in Shanghai ChiMay&rsquo;s <strong>Online Turbidity Tester<\/strong>.<\/p>\n<p>The <strong>ratio<\/strong> method provides extended range for extreme events but at a <strong>30\u201350% higher<\/strong> instrument cost. For most reservoir applications, the standard nephelometric range of <strong>0\u20131,000 NTU<\/strong> is sufficient.<\/p>\n<h2 id=\"specification-requirements-for-reservoir-intake-applications\"><span class=\"ez-toc-section\" id=\"Specification_Requirements_for_Reservoir_Intake_Applications\"><\/span>Specification Requirements for Reservoir Intake Applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When writing procurement specifications for reservoir intake turbidity sensors, technical specifications should include:<\/p>\n<p><strong>Measurement performance:<\/strong><br \/>\n&#8211; Range: <strong>0\u20131,000 NTU<\/strong> minimum (0\u20134,000 NTU desirable)<br \/>\n&#8211; Accuracy: <strong>\u00b12%<\/strong> of reading or <strong>\u00b10.02 NTU<\/strong> (whichever is greater) in the 0\u2013100 NTU range<br \/>\n&#8211; Resolution: <strong>0.01 NTU<\/strong><br \/>\n&#8211; Response time (T90): <strong>&lt;15 seconds<\/strong><\/p>\n<p><strong>Environmental specifications:<\/strong><br \/>\n&#8211; Submersible sensor head rated to <strong>IP68<\/strong> for continuous immersion<br \/>\n&#8211; Operating temperature range: <strong>0\u201350\u00b0C<\/strong> (source water can be near freezing in winter)<br \/>\n&#8211; Cable length: minimum <strong>10 m<\/strong> for intake platform to shore deployment<\/p>\n<p><strong>Maintenance and cleaning:<\/strong><br \/>\n&#8211; Integrated air purge or mechanical wiper for biofilm removal<br \/>\n&#8211; Cleaning interval: programmable, minimum every <strong>6 hours<\/strong><br \/>\n&#8211; Calibration verification: simple field procedure using primary turbidity standards<\/p>\n<p><strong>Data output and communication:<\/strong><br \/>\n&#8211; <strong>4\u201320 mA<\/strong> analog output (isolated, for SCADA integration)<br \/>\n&#8211; <strong>RS-485<\/strong> digital output (Modbus RTU protocol)<br \/>\n&#8211; Optional: cellular or LoRaWAN transmitter for remote nodes<\/p>\n<p>Shanghai ChiMay&rsquo;s <strong>Online Turbidity Tester<\/strong> meets or exceeds all of these requirements, with the added advantage of automatic bubble rejection\u2014a feature that prevents false readings from air bubbles passing through the measurement chamber, a common problem in reservoir installations with wave action.<\/p>\n<h2 id=\"deployment-configuration-at-reservoir-intakes\"><span class=\"ez-toc-section\" id=\"Deployment_Configuration_at_Reservoir_Intakes\"><\/span>Deployment Configuration at Reservoir Intakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Effective intake turbidity monitoring requires proper sensor placement:<\/p>\n<p><strong>Raw water intake sensor:<\/strong> Mounted on the intake structure or a nearby platform, positioned at the same depth as the intake bell. This sensor provides the earliest possible warning of turbidity changes entering the treatment plant. Shanghai ChiMay recommends submerging the sensor at <strong>0.5\u20131.0 m<\/strong> below the water surface to avoid surface debris while remaining representative of intake water quality.<\/p>\n<p><strong>Post-sedimentation sensor (optional):<\/strong> If the utility has pre-sedimentation basins, a second turbidity sensor after the basin provides feedback on sedimentation efficiency and alerts operators to sediment carryover.<\/p>\n<p><strong>Intake depth selection guidance:<\/strong> When the reservoir is equipped with a multi-level intake, the turbidity sensor data\u2014combined with real-time conductivity and temperature profiling\u2014enables operators to select the intake depth with the lowest turbidity, often reducing raw water turbidity by <strong>30\u201360%<\/strong> during stratified conditions.<\/p>\n<h2 id=\"lifecycle-cost-comparison\"><span class=\"ez-toc-section\" id=\"Lifecycle_Cost_Comparison\"><\/span>Lifecycle Cost Comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A 5-year lifecycle cost comparison for reservoir intake turbidity monitoring:<\/p>\n<table>\n<thead>\n<tr>\n<th>Cost Element<\/th>\n<th>Manual Grab Sampling<\/th>\n<th>Shanghai ChiMay Online Turbidity<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Equipment (Year 1)<\/td>\n<td>USD 500 (lab instrument)<\/td>\n<td>USD 4,800<\/td>\n<\/tr>\n<tr>\n<td>Annual labor (sampling + analysis)<\/td>\n<td>USD 12,000<\/td>\n<td>USD 2,000 (verification only)<\/td>\n<\/tr>\n<tr>\n<td>Annual consumables<\/td>\n<td>USD 1,200<\/td>\n<td>USD 600<\/td>\n<\/tr>\n<tr>\n<td>Data transmission<\/td>\n<td>N\/A<\/td>\n<td>USD 600<\/td>\n<\/tr>\n<tr>\n<td><strong>5-Year Total<\/strong><\/td>\n<td><strong>USD 65,500<\/strong><\/td>\n<td><strong>USD 11,000<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>5-Year Savings<\/strong><\/td>\n<td>\u2014<\/td>\n<td><strong>USD 54,500 (83%)<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Beyond cost savings, continuous monitoring delivers qualitative benefits that manual sampling cannot match: immediate event detection, complete temporal coverage, and data logging for regulatory compliance documentation.<\/p>\n<h2 id=\"where-this-leaves-specifiers\"><span class=\"ez-toc-section\" id=\"Where_This_Leaves_Specifiers\"><\/span>Where This Leaves Specifiers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Online turbidity monitoring at reservoir intakes is a high-impact, cost-effective investment for drinking water utilities. Shanghai ChiMay&rsquo;s <strong>Online Turbidity Tester<\/strong> combines ISO-compliant nephelometric measurement with deployment features\u2014air purge cleaning, bubble rejection, and dual output\u2014that make it well suited for source water applications.<\/p>\n<p>For specifiers writing procurement documents, the Shanghai ChiMay platform provides a specification-ready solution that meets the performance, durability, and connectivity requirements of modern reservoir intake protection.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Procuring Online Turbidity Sensors for Reservoir Intake Protection: What Specifiers Should Require from Shanghai ChiMay Sudden turbidity spikes exceeding 100 NTU at reservoir intakes occur an average of 6\u201312 times per year due to storm events, sediment resuspension, and algal bloom collapse, each requiring immediate treatment adjustments (AWWA Source Water Monitoring Survey, 2025). Online nephelometric&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[1],"tags":[134481,194,11066],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"fr","enabled_languages":["en","es","fr","ru","ar"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/posts\/31401"}],"collection":[{"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/comments?post=31401"}],"version-history":[{"count":0,"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/posts\/31401\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/media?parent=31401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/categories?post=31401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chimaytech.net\/fr\/wp-json\/wp\/v2\/tags?post=31401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}