{"id":44676,"date":"2019-08-17T09:27:26","date_gmt":"2019-08-17T03:57:26","guid":{"rendered":"https:\/\/ye1o34zhk8.onrocket.site\/?p=44676"},"modified":"2020-03-27T10:05:35","modified_gmt":"2020-03-27T04:35:35","slug":"interface-level-calculation","status":"publish","type":"post","link":"https:\/\/instrumentationtools.com\/interface-level-calculation\/","title":{"rendered":"How to do Interface Level Calculation using DP Transmitter ?"},"content":{"rendered":"<p><strong>Interface level calculation<\/strong> is not complicated.<\/p>\n<p>If we just have our basics concepts clear it is very straight forward.<\/p>\n<h4>First simple pressure measurement formula<\/h4>\n<p><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44679 size-full\" title=\"Pressure Measurement Formula\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2019\/08\/Pressure-Measurement-Formula.jpg\" alt=\"Pressure Measurement Formula\" width=\"698\" height=\"295\" \/><\/p>\n<div class=\"slate-resizable-image-embed slate-image-embed__resize-full-width\"><\/div>\n<p>The pic above shows a Container of Height 100 Inches<\/p>\n<p>And this tank contains Liquid of Specific gravity 0.9<\/p>\n<p>So what is the pressure at the bottom?<\/p>\n<h4>Height x Specific gravity = InH2O<\/h4>\n<p>100 (inches) X 0.9 = 90 inH2O<\/p>\n<p>This Formula is adapted from <a href=\"https:\/\/www.emerson.com\/documents\/automation\/technical-data-sheet-interface-measurement-pressure-en-74330.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Rosemount<\/a> technical Datasheet (paper no :- 00816-0100-3207)<\/p>\n<p>Note :- Specific gravity :- It compares with Density of substance with that of WATER (H2O)<\/p>\n<p>Hence when we multiply ,<\/p>\n<p>Height (Inches)\u00a0x S.G ( Comparing with Density of substance with that of WATER (H2O))<\/p>\n<p>= inH2O (<strong>The unit we get as product<\/strong>)<\/p>\n<p>This our Simple Formula that we will be using.<\/p>\n<h2>Interface Level Calculation<\/h2>\n<p><em>One prerequisite recommended for this system is to fill impulse lines with Heavier fill fluid<\/em>.<\/p>\n<h3>At 4mA Case ( Zero interface level ) :-<\/h3>\n<p><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44681 size-full\" title=\"Zero Interface Level Calculation\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2019\/08\/Zero-Interface-Level-Calculation.jpg\" alt=\"Zero Interface Level Calculation\" width=\"799\" height=\"352\" \/><\/p>\n<p>In this case the entire portion we are measuring will be filled with \u201cLighter fluid\u201d .<\/p>\n<p>So as per our formula<\/p>\n<h4><strong>Pressure at HP tapping<\/strong>\u00a0=\u00a0<strong>Height<\/strong>\u00a0X\u00a0<strong>Specific gravity<\/strong><\/h4>\n<h4>Pressure at HP tapping = 100 inches X 0.5 = 50 inH2O<\/h4>\n<p>(One prerequisite recommended for this system is to fill LP impulse lines with Heavier fill fluid to get stable reading at 20mA )<\/p>\n<p>Hence<\/p>\n<h4>Pressure at LP tapping = Height\u00a0X Specific gravity<\/h4>\n<h4>Pressure at LP tapping = 100 inches X 1 = 100 inH2O<\/h4>\n<h4>Differential pressure of Transmitter = H.P \u2013 L.P<\/h4>\n<h4>Differential pressure of Transmitter = 50 inH2O \u2013 100 inH2O = -50 inH2O<\/h4>\n<h4>It means at -50 inH2O transmitter will give 4mA<\/h4>\n<p>Hurry we are already half way !!!!!<\/p>\n<h3>At 20mA Case ( When tank is full with Heavy fluid)<\/h3>\n<p><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44682 size-full\" title=\"Full Interface Level Calculation\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2019\/08\/Full-Interface-Level-Calculation.jpg\" alt=\"Full Interface Level Calculation\" width=\"829\" height=\"345\" \/><\/p>\n<div class=\"slate-resizable-image-embed slate-image-embed__resize-full-width\"><\/div>\n<p>As per our formula<\/p>\n<h4>Pressure at HP tapping\u00a0=\u00a0Height\u00a0X\u00a0Specific gravity<\/h4>\n<h4>Pressure at HP tapping\u00a0= 100 inches X 1 =100 inH2O<\/h4>\n<h4>Pressure at LP tapping = Height\u00a0X Specific gravity<\/h4>\n<h4>Pressure at LP tapping = 100 inches X 1 =100 inH2O (as LP tapping is filled with Heavier fluid)<\/h4>\n<h4>Differential pressure of Transmitter = H.P \u2013 L.P<\/h4>\n<h4>Differential pressure of Transmitter = 100 inH2O \u2013 100 inH2O = 0 inH2O<\/h4>\n<h4>It means at 0 inH2O transmitter will give 20mA<\/h4>\n<h3>So here\u2019s our calibration range \u201c-50 inH<sub>2<\/sub>O to 0 inH<sub>2<\/sub>O\u201d<\/h3>\n<p>For Extra information, what if we need to know what would transmitter give at 50% of Interface<\/p>\n<h3>Case 3 ( 50% is filled with Lighter fluid and 50% is filled with heavier fluid)<\/h3>\n<p><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44683 size-full\" title=\"Interface Level Calculation\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2019\/08\/Interface-Level-Calculation.jpg\" alt=\"Interface Level Calculation\" width=\"891\" height=\"342\" \/><\/p>\n<div class=\"slate-resizable-image-embed slate-image-embed__resize-full-width\"><\/div>\n<p>50 % of transmitter output will be 12mA transmitter at-25inH2O (Half of total calibration range -50inH2O to 0inH2O )<\/p>\n<h4>Interface = { (D.P by transmitter \u2013 Lower calibration range)\/Span } X Total C-C distance<\/h4>\n<p>Here C-C distance nothing but center to center of measuring distance, as shown in above picture.<\/p>\n<p>I = { ( -25 inH2O \u2013 (-50 inH2O)\u00a0) X 50inH2O } X 100 inH2O<\/p>\n<p><strong>Interface = 50 inH2O<\/strong><\/p>\n<p><em>Cross checking<\/em><\/p>\n<p><em>Our total distance is 100 inches of H2O<\/em><\/p>\n<p><em>When interface is at 50% means Interface between Lighter and heavier fluid will be at 50 inH2O<\/em><\/p>\n<p><em>Thanks for reading !<\/em><\/p>\n<h4>Author : Asad Shaikh<\/h4>\n<p>Profile : <a href=\"https:\/\/www.linkedin.com\/in\/asad-shaikh-a558b5105\/\" target=\"_blank\" rel=\"noopener noreferrer\">Linkedin<\/a><\/p>\n<h4>Articles You May Like<\/h4>\n<p><a href=\"https:\/\/instrumentationtools.com\/basics-cable-shields\/\" target=\"_blank\" rel=\"noopener noreferrer\">Types of\u00a0 Cable Shields<\/a><\/p>\n<p><a href=\"https:\/\/instrumentationtools.com\/instrument-air-system\/\" target=\"_blank\" rel=\"noopener noreferrer\">Instrument Air System Design<\/a><\/p>\n<p><a href=\"https:\/\/instrumentationtools.com\/multiple-thermowell-installations-problems\/\" target=\"_blank\" rel=\"noopener noreferrer\">Thermowell Installation Problem<\/a><\/p>\n<p><a href=\"https:\/\/instrumentationtools.com\/cable-screen-shall-not-be-grounded-at-field-device\/\" target=\"_blank\" rel=\"noopener noreferrer\">Cable Screen Grounding<\/a><\/p>\n<p><a href=\"https:\/\/instrumentationtools.com\/how-to-select-a-fuse\/\" target=\"_blank\" rel=\"noopener 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If we just have our basics concepts clear it is very straight forward. First simple pressure measurement formula The pic above shows a Container of Height 100 Inches And this tank contains Liquid of Specific gravity 0.9 So what is the pressure at the bottom? Height x Specific gravity [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":44681,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","footnotes":""},"categories":[22],"tags":[52009,52243,41997,8527,27673,34931,45436,3776,52028,565,45402,3778,3773,45074,52005,52001,45400,52003,52016,52020,41998],"class_list":{"0":"post-44676","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-level-measurement","8":"tag-best-interface-level-measurement","9":"tag-calibration-for-interface-level-measurement","10":"tag-closed-tank-interface-level-measurement","11":"tag-differential-pressure-interface-level","12":"tag-differential-pressure-transmitter-for-interface-level-measurement","13":"tag-displacer-interface-level-measurement","14":"tag-displacer-interface-level-measurement-calculations","15":"tag-dp-interface-level-calculation","16":"tag-dp-transmitter-interface-level-transmitter","17":"tag-interface-level","18":"tag-interface-level-calculation","19":"tag-interface-level-calculation-of-dp","20":"tag-interface-level-dp","21":"tag-interface-level-measurement-calculation","22":"tag-interface-level-measurement-calibration","23":"tag-interface-level-measurement-dp-transmitter","24":"tag-interface-level-measurement-formula","25":"tag-interface-level-measurement-techniques","26":"tag-liquid-interface-level-measurement","27":"tag-measurement-of-interface-level","28":"tag-tank-interface-level-measurement"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to do Interface Level Calculation using DP Transmitter ?<\/title>\n<meta name=\"description\" content=\"DP Transmitter used for interface level measurement. 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