{"id":5055,"date":"2025-10-02T10:55:56","date_gmt":"2025-10-02T09:55:56","guid":{"rendered":"https:\/\/atten2.com\/?post_type=knowledge&#038;p=5055"},"modified":"2025-10-06T11:45:27","modified_gmt":"2025-10-06T10:45:27","slug":"seeing-the-whole-picture-comparing-rh-and-ppm-in-oil-moisture-monitoring","status":"publish","type":"knowledge","link":"https:\/\/atten2.com\/en\/knowledge\/seeing-the-whole-picture-comparing-rh-and-ppm-in-oil-moisture-monitoring\/","title":{"rendered":"Seeing the whole picture: Comparing %RH and PPM in oil moisture monitoring"},"content":{"rendered":"<section class=\"l-section wpb_row height_small\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-12 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h3><span class=\"TextRun SCXW200549742 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW200549742 BCX8\">Water contamination is one of the most critical factors affecting lubricant reliability and machine performance.<\/span><\/span><\/h3>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span data-contrast=\"auto\">Even small amounts can accelerate oxidation, deplete additives, promote corrosion, and cause premature component failure. Studies show that bearing lifetime can be reduced by up to 75% with contamination levels as low as 1,000 ppm*.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Traditional laboratory methods, such as Karl Fischer titration, provide accurate results but are <strong>offline<\/strong> and unsuitable for <a href=\"https:\/\/atten2.com\/sensores-opticos\/\"><strong>continuous monitoring<\/strong><\/a>. This has led to the adoption of online moisture sensors, with two main approaches: relative humidity (%RH) sensors and absolute moisture (ppm) sensors.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Both technologies provide valuable insights, but their roles in maintenance are different:<strong> %RH offers an early signal<\/strong>, while <strong>ppm provides the actionable measurement needed for standardized decision-making.<\/strong><\/span><strong>\u00a0<\/strong><\/p>\n<\/div><\/div><div class=\"w-btn-wrapper align_none\"><a class=\"w-btn us-btn-style_1\" href=\"https:\/\/atten2.com\/en\/sensor\/oilmoisture\/\"><span class=\"w-btn-label\">Detect water with Atten[2]<\/span><\/a><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h2><span class=\"TextRun SCXW129143526 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW129143526 BCX8\">Principles of measurement<\/span><\/span><\/h2>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h3><span class=\"TextRun SCXW67122686 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW67122686 BCX8\">Relative Humidity Sensors (%RH)<\/span><\/span><\/h3>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span data-contrast=\"auto\"><a href=\"https:\/\/atten2.com\/en\/knowledge\/water-a-challenge-in-the-lubrication-of-critical-paper-machinery\/\">Relative humidity<\/a> sensors measure the ratio between the actual amount of dissolved water in oil and the maximum that oil can dissolve at a given temperature.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">0% RH indicates completely dry oil.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">100% RH indicates saturation, beyond which emulsified or free water cannot be quantified.<\/span><\/li>\n<\/ul>\n<p><strong>Key characteristics:\u00a0<\/strong><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Extremely sensitive to the earliest traces of water, ideal for detecting initial ingress in systems that should remain dry.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Provide trend information that can serve as an early-warning tool.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Most useful where the lubricant is expected to operate close to dry conditions.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<\/div><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h3><span class=\"TextRun SCXW197429801 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW197429801 BCX8\">PPM Sensors (Absolute Moisture Measurement)<\/span><\/span><\/h3>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span data-contrast=\"auto\">PPM sensors measure the total water content in oil in absolute terms, including:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Dissolved water.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Emulsified water (droplets suspended in oil).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Free water (separated phase).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Modern ppm-based probes, such as the <a href=\"https:\/\/atten2.com\/en\/sensor\/oilmoisture\/\">Atten2 OilMoisture Probe<\/a>, provide continuous measurements up to 25,000 ppm. They detect reliably from around 200 ppm, making them essential for quantifying contamination and supporting preventive<\/span><b><span data-contrast=\"auto\"> maintenance in critical assets.<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h2><span class=\"TextRun SCXW206532679 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW206532679 BCX8\">Comparative perspective<\/span><\/span><span class=\"EOP SCXW206532679 BCX8\" data-ccp-props=\"{}\">\u00a0<\/span><\/h2>\n<\/div><\/div><div class=\"w-separator size_large\"><\/div><div class=\"w-image align_center\"><div class=\"w-image-h\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1980\" src=\"https:\/\/atten2.com\/wp-content\/uploads\/2025\/10\/Aspecto-1-scaled.png\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/atten2.com\/wp-content\/uploads\/2025\/10\/Aspecto-1-scaled.png 2560w, https:\/\/atten2.com\/wp-content\/uploads\/2025\/10\/Aspecto-1-300x232.png 300w, https:\/\/atten2.com\/wp-content\/uploads\/2025\/10\/Aspecto-1-1024x792.png 1024w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span class=\"TextRun SCXW213569202 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW213569202 BCX8\">%RH sensors are valuable as early indicators, particularly in systems that are designed to remain dry. They can detect the very first traces of moisture that would otherwise go unnoticed. <\/span><\/span><\/p>\n<p><span class=\"TextRun SCXW213569202 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW213569202 BCX8\">However, when water levels rise above minimal contamination, ppm sensors become essential. Only ppm delivers absolute values that can be compared across systems, aligned with OEM or ISO thresholds, and used as a reliable basis for maintenance decisions. <\/span><\/span><\/p>\n<p><span class=\"TextRun SCXW213569202 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW213569202 BCX8\">In this sense, <strong>%RH provides the alert, but ppm provides the full picture and the confidence to act.<\/strong><\/span><\/span><strong><span class=\"EOP SCXW213569202 BCX8\" data-ccp-props=\"{}\">\u00a0<\/span><\/strong><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h2><span class=\"NormalTextRun SpellingErrorV2Themed SCXW208479830 BCX8\" data-ccp-parastyle=\"heading 2\"><span class=\"TextRun SCXW6092147 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW6092147 BCX8\">Practical Applications<\/span><\/span><\/span><\/h2>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span data-contrast=\"auto\">Different industries and lubrication systems benefit from one or both approaches:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\"><strong>Steel mills:<\/strong> Continuous exposure to cooling water requires ppm monitoring to quantify contamination levels.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\"><strong>Pulp &amp; Paper:<\/strong> High-humidity environments where emulsified water can rapidly compromise performance.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\"><strong>Steam turbines:<\/strong> Benefit from both early detection (via %RH) and absolute quantification (via ppm).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\"><strong>Lubrication systems with heat exchangers:<\/strong> Vulnerable to condensation and water ingress, requiring continuous monitoring.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">By combining early warnings from %RH with the absolute certainty of ppm, operators can tailor maintenance strategies to the criticality of each asset.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><h2><span class=\"TextRun SCXW245643436 BCX8\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SpellingErrorV2Themed SCXW245643436 BCX8\" data-ccp-parastyle=\"heading 2\">Conclusion<\/span><\/span><\/h2>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><div class=\"vc_col-sm-6 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p><span data-contrast=\"auto\">Relative humidity sensors have a clear role: they are effective for <strong>early detection in low-moisture environments<\/strong>, offering valuable trend information that signals when water first appears.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Yet when it comes to critical assets, harsh environments, or applications where water ingress is more than a rare event, ppm sensors stand out as the superior choice. By quantifying dissolved, emulsified, and free water in absolute terms\u2014up to 25,000 ppm\u2014they provide the actionable data that maintenance teams need to set alarms, compare systems, and plan interventions with certainty.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">In practice:<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\"> %RH sensors tell you that water has appeared. <\/span><\/li>\n<li><span data-contrast=\"auto\">PPM sensors tell you how much is there, how serious it is, and when you need to act.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<\/div><\/div><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p data-start=\"40\" data-end=\"111\"><strong data-start=\"40\" data-end=\"109\">Are you ready to take action exactly when your machine needs it?<\/strong><\/p>\n<p data-start=\"113\" data-end=\"260\" data-is-last-node=\"\" data-is-only-node=\"\">\ud83d\udcac Do you have questions about how to apply this technology in your plant?<br data-start=\"187\" data-end=\"190\" \/>Let\u2019s talk. A technical specialist can help you evaluate your case.<\/p>\n<\/div><\/div><div class=\"w-btn-wrapper align_none\"><a class=\"w-btn us-btn-style_1\" href=\"https:\/\/atten2.com\/en\/about-us\/#contact\"><span class=\"w-btn-label\">Ask for a meeting<\/span><\/a><\/div><\/div><\/div><\/div><\/div><div class=\"w-separator size_medium\"><\/div><div class=\"g-cols wpb_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-12 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p>Bibliography:<\/p>\n<ul>\n<li data-start=\"272\" data-end=\"485\">\n<p data-start=\"274\" data-end=\"485\">Machinery Lubrication. (s.f.). <em data-start=\"305\" data-end=\"327\">Bearing water damage<\/em>. <a class=\"decorated-link\" href=\"https:\/\/www.machinerylubrication.com\/Read\/29649\/bearing-water-damage\" target=\"_new\" rel=\"noopener\" data-start=\"343\" data-end=\"483\">https:\/\/www.machinerylubrication.com\/Read\/29649\/bearing-water-damage<\/a><\/p>\n<\/li>\n<li data-start=\"486\" data-end=\"727\">\n<p data-start=\"488\" data-end=\"727\">Oil Testing Labs. (s.f.). <em data-start=\"514\" data-end=\"563\">Understanding the impact of water in lubricants<\/em>. <a class=\"decorated-link\" href=\"https:\/\/oil-testing.com\/understanding-the-impact-of-water-in-lubricants\" target=\"_new\" rel=\"noopener\" data-start=\"579\" data-end=\"725\">https:\/\/oil-testing.com\/understanding-the-impact-of-water-in-lubricants<\/a><\/p>\n<\/li>\n<\/ul>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"Water contamination is one of the most critical factors affecting lubricant reliability and machine performance. Even small amounts can accelerate oxidation, deplete additives, promote corrosion, and cause premature component failure. Studies show that bearing lifetime can be reduced by up to 75% with contamination levels as low as 1,000 ppm*.\u00a0 Traditional laboratory methods, such as...","protected":false},"author":3,"featured_media":5072,"parent":0,"menu_order":0,"template":"","tags":[165,167],"sensor-padre":[27],"knowledge_cat":[91],"class_list":["post-5055","knowledge","type-knowledge","status-publish","has-post-thumbnail","hentry","tag-humedad-en","tag-humidity-en","sensor-padre-oilmoisture-en","knowledge_cat-tribology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Atten[2] &middot; Seeing the whole picture: Comparing %RH and PPM in oil moisture monitoring<\/title>\n<meta name=\"description\" content=\"%RH sensors detect the initial presence of water, while ppm sensors quantify its level and severity.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atten2.com\/en\/knowledge\/seeing-the-whole-picture-comparing-rh-and-ppm-in-oil-moisture-monitoring\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Atten[2] &middot; 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