{"id":26850,"date":"2019-03-26T15:19:34","date_gmt":"2019-03-26T09:49:34","guid":{"rendered":"https:\/\/3-inst.toejvy8-liquidwebsites.com\/?p=26850"},"modified":"2019-09-07T07:00:47","modified_gmt":"2019-09-07T01:30:47","slug":"liquid-flow-control-loop-controller-action","status":"publish","type":"post","link":"https:\/\/instrumentationtools.com\/liquid-flow-control-loop-controller-action\/","title":{"rendered":"Liquid Flow Control Loop Controller Action"},"content":{"rendered":"<p style=\"text-align: justify;\">A <strong>liquid flow control loop<\/strong> consisting of a <a href=\"https:\/\/instrumentationtools.com\/flow-transmitters-questions-and-answers\/\" target=\"_blank\" rel=\"noopener noreferrer\">flow transmitter<\/a> (FT) to sense liquid flow rate through the pipe and output an electronic signal corresponding to the flow.<\/p>\n<p style=\"text-align: justify;\">A flow controller (FC) to sense the flow signal (from FT) and decide which way the <a href=\"https:\/\/instrumentationtools.com\/control-valve-working-animation\/\" target=\"_blank\" rel=\"noopener noreferrer\">control valve<\/a> should move, a <a href=\"https:\/\/instrumentationtools.com\/current-pressure-ip-converter-principle\/\" target=\"_blank\" rel=\"noopener noreferrer\">current-to-air (I\/P) transducer<\/a> (FY) to convert the controller\u2019s electronic output signal into a variable air pressure, and an air-operated flow control valve (FV) to throttle the liquid flow:<\/p>\n<h2 style=\"text-align: left;\">Flow Control Loop<\/h2>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-26851 size-full\" title=\"Liquid Flow Control Loop Controller Action\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2018\/04\/liquid-flow-control-loop.png\" alt=\"liquid flow control loop\" width=\"916\" height=\"506\" \/><\/p>\n<h5 style=\"text-align: justify;\">The actions of each instrument are shown here:<\/h5>\n<ul style=\"text-align: justify;\">\n<li>FT: increasing liquid flow = increasing current signal<\/li>\n<li>FC: increasing process variable (input) signal = decreasing output signal<\/li>\n<li>FY: increasing current input signal = increasing pneumatic output signal<\/li>\n<li>FV: increasing pneumatic signal = open more<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Describe what will happen to all signals in this c<a href=\"https:\/\/instrumentationforum.com\/t\/basics-of-control-loop-in-p-id\/7079\" target=\"_blank\" rel=\"noopener noreferrer\">ontrol loop<\/a> with the controller in \u201cautomatic\u201d mode (ready to compensate for any changes in flow rate by automatically moving the valve) if the pump were to suddenly spin faster and create more fluid pressure, causing an increase in flow rate.<\/p>\n<p style=\"text-align: justify;\">Also describe what will happen to all signals in this control loop with the controller in \u201cmanual\u201d mode (where the output signal remains set at whatever level the human operator sets it at) if the pump were to suddenly spin faster and create more fluid pressure, causing an increase in flow rate.<\/p>\n<p style=\"text-align: justify;\"><strong>Extra Question :<\/strong><\/p>\n<p style=\"text-align: justify;\">Explain the practical benefit of having a \u201cmanual\u201d mode in a process loop controller. When might we intentionally use manual mode in an operating process condition?<\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #ff0000;\">Answer :<\/span><\/h3>\n<h4 style=\"text-align: justify;\">In automatic mode:<\/h4>\n<p style=\"text-align: justify;\">Process flow rate (increase) \u2192 FT output signal (increase milliamps) \u2192 FC output signal (decrease milliamps) \u2192 FY output signal (decrease PSI) \u2192 FV position (moves further closed, pinching off liquid flow).<\/p>\n<h4 style=\"text-align: justify;\">In manual mode:<\/h4>\n<p style=\"text-align: justify;\">Process flow rate (increase) \u2192 FT output signal (increase milliamps) \u2192 FC output signal (remains steady) \u2192 FY output signal (remains steady) \u2192 FV position (holds position).<\/p>\n<p style=\"text-align: justify;\">The important part of this question is the difference in response between \u201cautomatic\u201d and \u201cmanual\u201d controller modes. In automatic control mode, the <a href=\"https:\/\/instrumentationtools.com\/air-to-open-air-to-close-valves-and-direction-of-control-action\/\" target=\"_blank\" rel=\"noopener noreferrer\">controller<\/a> takes action to bring the process back to<a href=\"https:\/\/instrumentationtools.com\/setpoints-alarms\/\" target=\"_blank\" rel=\"noopener noreferrer\"> setpoint<\/a>. In manual control mode, the controller just lets the process drift and takes no action to stop it.<\/p>\n<p style=\"text-align: justify;\">At first, having a \u201cmanual\u201d mode in a control system seems pointless. However, giving human operators the ability to manually override the otherwise automatic actions of a control system is important for start-up, <a href=\"https:\/\/instrumentationtools.com\/emergency-shutdown-system-philosophy\/\" target=\"_blank\" rel=\"noopener noreferrer\">shut-down<\/a>, and handling emergency (unusual) conditions in a process system.<\/p>\n<p style=\"text-align: justify;\">Manual mode is also a very important diagnostic tool for instrument technicians and operators alike. Being able to \u201cturn off the brain\u201d of an automatic <a href=\"https:\/\/instrumentationtools.com\/process-control-systems\/\" target=\"_blank\" rel=\"noopener noreferrer\">control system<\/a> and watch process response to manual changes in manipulated variable (final control element) signals gives technical personnel opportunity to test for unusual control valve behavior, process quirks, and other behaviors in a system that can lead to poor automatic control.<\/p>\n<h5><span style=\"color: #339966;\">Share Your Answers via Comments<\/span><\/h5>\n","protected":false},"excerpt":{"rendered":"<p>A liquid flow control loop consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and output an electronic signal corresponding to the flow. A flow controller (FC) to sense the flow signal (from FT) and decide which way the control valve should move, a current-to-air (I\/P) transducer (FY) to convert [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":26851,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","footnotes":""},"categories":[12,42328],"tags":[38301,42419,42412,50557,38245,50555,42420,42421,26376,10869,42422,42423,10891,42424,38298,38324,38296,38295,38297,26454,26469,42415,26491,42416,26493,42417,26523,26525,26528,42425,50556,38302,42426,26585,42427,42428,42429,42430,38299,42418,42431,42432,42433,26377,42434,42435,38300],"class_list":{"0":"post-26850","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-control-systems","8":"category-question-for-you","9":"tag-advanced-process-control-interview-questions","10":"tag-chemical-process-control-questions-and-answers","11":"tag-electrical-instrumentation-and-process-control-objective-questions","12":"tag-industrial-process-control-questions","13":"tag-instrumentation-and-process-control-interview-questions-pdf","14":"tag-practical-control-systems-questions","15":"tag-process-control-and-instrumentation-questions-and-answers","16":"tag-process-control-aptitude-questions","17":"tag-process-control-basic-questions","18":"tag-process-control-engineer-interview-questions","19":"tag-process-control-exam-questions","20":"tag-process-control-exam-questions-and-answers","21":"tag-process-control-gate-questions","22":"tag-process-control-important-questions","23":"tag-process-control-instrumentation-interview-questions","24":"tag-process-control-instrumentation-viva-questions","25":"tag-process-control-interview-questions-and-answers","26":"tag-process-control-interview-questions-and-answers-pdf","27":"tag-process-control-interview-questions-pdf","28":"tag-process-control-lab-viva-questions","29":"tag-process-control-multiple-choice-questions","30":"tag-process-control-objective-questions","31":"tag-process-control-objective-questions-and-answers-pdf","32":"tag-process-control-objective-questions-pdf","33":"tag-process-control-objective-type-questions-and-answers","34":"tag-process-control-objective-type-questions-and-answers-pdf","35":"tag-process-control-questions","36":"tag-process-control-questions-and-answers","37":"tag-process-control-questions-and-answers-pdf","38":"tag-process-control-quiz-questions","39":"tag-process-control-system-questions","40":"tag-process-control-technician-interview-questions","41":"tag-process-control-test-questions","42":"tag-process-control-viva-questions","43":"tag-process-dynamics-and-control-exam-questions","44":"tag-process-dynamics-and-control-questions","45":"tag-questions-on-process-control","46":"tag-statistical-process-control-exam-questions","47":"tag-statistical-process-control-interview-questions","48":"tag-statistical-process-control-multiple-choice-questions","49":"tag-statistical-process-control-practice-questions","50":"tag-statistical-process-control-questions-and-answers","51":"tag-statistical-process-control-quiz-questions","52":"tag-statistical-process-control-related-basic-questions-and-answers","53":"tag-statistical-process-control-test-questions","54":"tag-viva-questions-for-process-control-timer","55":"tag-water-process-control-interview-questions"},"yoast_head":"<!-- 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