{"id":38023,"date":"2024-02-05T09:16:48","date_gmt":"2024-02-05T09:16:48","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=article&#038;p=38023"},"modified":"2026-02-16T22:32:12","modified_gmt":"2026-02-16T22:32:12","slug":"regelkreis-variablen-tutorial-das-zwischen-massenstrom-volumenstrom-oder-druckregelung-wechselt","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/control-loop-variable-tutorial-changing-between-mass-flow-volumetric-flow-or-pressure-control\/","title":{"rendered":"Tutorial zu Regelkreisvariablen: Wechseln zwischen Massendurchfluss-, Volumenstrom- oder Druckregelung"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_heading title=&#8221;Control loop variable tutorial: Changing between mass flow, volumetric flow, or pressure control&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<p>An Alicat <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/laminar-dp-mass-flow-controllers\/\" target=\"_blank\" rel=\"noopener\">mass flow controller<\/a> is usually set up to control <a href=\"https:\/\/www.alicat.com\/support\/what-is-mass-flow\/\" target=\"_blank\" rel=\"noopener\">mass flow rate<\/a>, but it can instead be set to <a href=\"https:\/\/www.alicat.com\/support\/controlling-pressure-with-an-alicat-mass-flow-controller\/\" rel=\"noopener\" target=\"_blank\">control pressure<\/a> or <a href=\"https:\/\/www.alicat.com\/support\/what-is-the-difference-between-mass-flow-and-volumetric-flow\/\" target=\"_blank\" rel=\"noopener\">volumetric flow rate<\/a>.<\/p>\n<p>See below for instructions on how to change the control variable.<\/p>\n<h2>Video tutorial<\/h2>\n<p><iframe title=\"Alicat Mass Flow Controller: Tutorial - Closed Loop Variable\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/5T3qmQbJTEg?feature=oembed&rel=0\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_accordion_item title=&#8221;Video transcript&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<p><span data-contrast=\"auto\">\u201cHello, my name is Michael Whiteside. I am an applications engineer here at Alicat Scientific. In this video, I\u2019m going to be showing you how to change the closed loop variable on your Alicat device. Now let\u2019s get started.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">In order to change the closed loop variable on your Alicat device, we will hit \u201cMENU\u201d (bottom right button), \u201cCONTROL\u201d (top left button), \u201cADV CONTROL\u201d (bottom middle button), \u201cLOOP SETUP&#8221; (top right button), <\/span><span data-contrast=\"auto\">and \u201cLOOP VAR\u201d at the top left here. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">As you can see, there are three variables in this list: &#8220;Mass Flow&#8221;, &#8220;Volumetric Flow&#8221;, and &#8220;Abs Pressure&#8221;. Whatever variable is selected here, the device will actively control to. Say we would like to set this to absolute pressure (top left button for &#8220;UP&#8221;, top middle button for &#8220;DOWN&#8221;), hit &#8220;SET&#8221; (bottom right button), and now this mass flow controller is actively controlling to pressure while measuring the mass flow. This specific mode is called closed loop pressure, or CLP. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">During CLP, we can establish a CLP max flow rate. This can be done by clicking \u201cMENU\u201d (bottom right button), \u201cCONTROL\u201d (top left button), \u201cADV CONTROL\u201d (bottom middle button), \u201cCONTROL OPTS\u201d\u00a0<br \/>(bottom middle button), and &#8220;CLP max flow&#8221; (top right button). <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">We click this top left button and we see the current CLP max flow is 2000 SCCM. We can really change this to whatever we would like. Say we change this to 1500 (top three buttons for &#8220;UP&#8221;, &#8220;DOWN&#8221; and &#8220;SELECT DIGIT&#8221;), hit &#8220;SET&#8221; (bottom right button). <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Now what this means is as the device is controlling to pressure, it will make sure to never exceed that 1500 SCCM or 1.5 SLPM. This limit gain<\/span><span data-contrast=\"auto\">\u00a0here<\/span><span data-contrast=\"auto\">\u00a0in the top right is a limiter P gain for the CLP maximum flow rate. What this does is it helps guide the valve behavior as the actual flow rate approaches the CLP max flow rate limit.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">That is how you change the closed loop variable on your Alicat device.\u201d\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_text _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<h2>Step-by-step instructions (front panel)<\/h2>\n<ol>\n<li>Press the bottom right button for \u201cMENU\u201d selection.<\/li>\n<li>Press the top left button for \u201cCONTROL\u201d selection.<\/li>\n<li>Press the bottom middle button for \u201cADV CONTROL\u201d selection.<\/li>\n<li>Press the top right button for \u201cLOOP SETUP\u201d selection.<\/li>\n<li>Press the top left button for \u201cLOOP VAR\u201d selection.<\/li>\n<li>Use the up and down buttons to select your desired variable.<\/li>\n<\/ol>\n<p>When switching from flow to pressure, it may be necessary to <a href=\"https:\/\/www.alicat.com\/support\/pid-tuning-pd-pdf-and-pd2i-tutorial\/\" target=\"_blank\" rel=\"noopener\">adjust the valve tuning parameters<\/a>.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"featured_media":46458,"parent":0,"template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1920","content-type":"","_searchwp_excluded":""},"categories":[],"class_list":["post-38023","support","type-support","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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