{"id":26962,"date":"2023-09-01T15:33:56","date_gmt":"2023-09-01T20:33:56","guid":{"rendered":"https:\/\/test.kele.com\/content\/?page_id=26962"},"modified":"2024-07-12T13:16:16","modified_gmt":"2024-07-12T18:16:16","slug":"scaling-bas-inputs-for-compound-vacuum-pressure-transmitters","status":"publish","type":"page","link":"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters","title":{"rendered":"Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.26.0&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h1>Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters<\/h1>\n<p>Q. Your pressure transmitters which are available in compound ranges are calibrated in inches Hg over the vacuum portion of their range, and in psig over the pressure portion. How do I scale my BAS input using two engineering units?<\/p>\n<p>A. Vacuum is usually measured in inches of mercury (&#8221;Hg), while positive pressure is measured in pounds per square inch gauge (psig). To interpret the output of your pressure transmitter, the entire range must be measured in the same units, usually psig. 30&#8221; Hg vacuum is equivalent to 14.73 psig. To determine pressure from the 4-20 mA output of a compound pressure transmitter,<br \/>you may use the formula:<\/p>\n<p>Pressure (psig) = [(mA-4)\/16 x Range] + Offset<\/p>\n<p>Where Range = Total pressure range of transmitter in psig<br \/>Offset = -14.73<\/p>\n<p>Example: A PTX1-15 (30&#8221; Hg to 30 psig) is outputting 16 mA. What is the pressure?<\/p>\n<p>Pressure (psig) = [(16-4)\/16 x [30 psig &#8211; (-14.73) + (-14.73 psig) = 18.8 psig<\/p>\n<p>What is the pressure at 6 mA output?<br \/>Pressure (psig) = [(6-4)\/16 [30 psig &#8211; (-14.73)+ (-14.73 psig) = -9.14 psig<\/p>\n<p>This may be easily converted into &#8221; Hg vacuum: (-9.14\/-14.73 ) 30&#8221; Hg = 18.6&#8221; Hg vacuum<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scaling BAS Inputs for Compound Vacuum \/ Pressure&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"full-width.php","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"folder":[251],"class_list":["post-26962","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters - kele.com<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters - kele.com\" \/>\r\n<meta property=\"og:description\" content=\"Scaling BAS Inputs for Compound Vacuum \/ Pressure...\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters\" \/>\r\n<meta property=\"og:site_name\" content=\"kele.com\" \/>\r\n<meta property=\"article:modified_time\" content=\"2024-07-12T18:16:16+00:00\" \/>\r\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\r\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\r\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters\",\"url\":\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters\",\"name\":\"Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters - kele.com\",\"isPartOf\":{\"@id\":\"https:\/\/www.kele.com\/content\/#website\"},\"datePublished\":\"2023-09-01T20:33:56+00:00\",\"dateModified\":\"2024-07-12T18:16:16+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.kele.com\/content\/technical-reference\/pressure\/scaling-bas-inputs-for-compound-vacuum-pressure-transmitters#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.kele.com\/content\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Scaling BAS Inputs for Compound Vacuum \/ Pressure Transmitters\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.kele.com\/content\/#website\",\"url\":\"https:\/\/www.kele.com\/content\/\",\"name\":\"kele.com\",\"description\":\"Kele is a single source supplier with a huge inventory for all your building automation requirements. 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