{"id":40057,"date":"2024-04-22T18:25:56","date_gmt":"2024-04-22T18:25:56","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=article&#038;p=40057"},"modified":"2026-01-23T20:42:55","modified_gmt":"2026-01-23T20:42:55","slug":"barometer-faq","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/barometer-faq\/","title":{"rendered":"Internes Barometer (-IB Sensor) FAQ"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; custom_css_free_form=&#8221;@media (max-width: 375px) {||  .et-db #et-boc .et-l .et_pb_post_content_0_tb_body {||  width:100% !important;||  }}&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#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; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;Internal barometer (-IB sensor) FAQ&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;|700|||||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<div class=\"link-with-icons-wrap m-b\"><span>Alicat mass flow and absolute pressure devices can be equipped with a barometer (-IB sensor) that provides barometric and gauge pressure information. Please contact us at 888-290-6060 or\u00a0<\/span><a href=\"mailto:info@alicat.com\">info@alicat.com<\/a><span>\u00a0with any questions<\/span><\/div>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; toggle_font=&#8221;|700|||||||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_accordion_item title=&#8221;What devices can have a barometer added?&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221;]<ul>\n\t<li>Alicat\u2019s differential pressure based mass flow <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/laminar-dp-mass-flow-meters\/\">meters<\/a> and\u00a0<a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/laminar-dp-mass-flow-controllers\/\">controllers<\/a>.<\/li>\n\t<li>Alicat\u2019s absolute pressure\u00a0<a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-meter\/\">gauges<\/a>,\u00a0<a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-controller\/pressure-controllers\/\">controllers<\/a>, and\u00a0<a href=\"https:\/\/www.alicat.com\/products\/pressure\/pressure-controller\/dual-valve-pressure-controllers\/\">dual-valve controllers<\/a>.<\/li>\n<\/ul>\n<em>Note: All portable devices come with a barometer by default.<\/em>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What are the primary features of an -IB unit?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<ul>\n<li>Measures barometric pressure<\/li>\n<li>Calculates gauge pressure using readings from barometric pressure and absolute pressure sensors<\/li>\n<li>Controllers can control gauge pressure instead of flow rate<\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Does adding an -IB sensor affect accuracy of my device?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>No, the accuracy of the device will not be affected.\u00a0However, the uncertainty of the gauge pressure reading will be affected, as it is the sum of the barometer and absolute pressure uncertainties.<\/p>\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;How do I use my -IB sensor to calibrate my absolute pressure sensor?&#8221; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n\nWhen the device is open to atmosphere, tare the pressure either with the\u00a0<a href=\"https:\/\/www.alicat.com\/support\/taring-auto-taring-tutorial\/\" target=\"_blank\" rel=\"noopener\">front panel<\/a>\u00a0or over\u00a0<a href=\"https:\/\/documents.alicat.com\/Alicat-Serial-Primer.pdf\" target=\"_blank\" rel=\"noopener\">serial communication<\/a>.\n\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Can I look at both absolute pressure and gauge pressure on a device that has an -IB sensor?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p>Yes. On the display, either can be selected.<\/p>\n<p>By default, only the absolute pressure will be shown in the serial data frame, but this can be replaced with gauge pressure (\u201cGP\u201d adder code) or barometric pressure (\u201cBP\u201d adder code). It is also possible to have absolute pressure, gauge pressure, and barometric pressure all show in the data frame (\u201cAGB\u201d adder code).<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What is the full scale range of absolute pressure for an -IB unit?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<ul>\n<li>For standard or anti-corrosive units: 11.5 to 160 PSIA<\/li>\n<li>For whisper units: 11.5 to 60 PSIA<\/li>\n<li>For high pressure units:\u00a0 11.5 to 320 PSIA<\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What is the full scale range of gauge pressure for an -IB unit?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<ul>\n<li>For standard or anti-corrosive units: 0 to 160 PSIG<\/li>\n<li>For whisper units: 0 to 60 PSIG.<\/li>\n<li>For high pressure units: 0 to 320 PSIG<\/li>\n<\/ul>\n<p><em>Note:\u00a0 Bidirectional flow devices will also have bidirectional gauge pressure ranges. For example, an <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/laminar-dp-mass-flow-controllers\/\" target=\"_blank\" rel=\"noopener\">MCD-Series<\/a>\u00a0unit will have a range of -160 PSIG to +160 PSIG.<\/em><\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What control loops are added on an -IB unit?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>Closed-loop pressure control on gauge pressure (\u201cCLPG\u201d adder code).<\/p>\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Is barometric pressure on my RS232 data frame? Gauge pressure? Absolute pressure?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>Absolute pressure is on the RS-232 data frame by default. This can be substituted with gauge or barometric pressure, or they can be added separately.<\/p>\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Do I have an analog output of absolute pressure, gauge pressure, or barometric pressure?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p>Most electrical connectors allow for two analog outputs.<\/p>\n<ol>\n<li>For a <u>primary analog output<\/u>, you can output:<br \/><br \/>\n<ol type=\"a\">\n<li>Absolute pressure: 5P, 10P, 1P, or CP<\/li>\n<li>Gauge pressure : 5PG, 10PG, 1PG, or CPG<\/li>\n<li>Barometric pressure : 5PB, 10PB, 1PB, or CPB<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol start=\"2\">\n<li>For a <u>secondary analog output<\/u>, you can output:<\/li>\n<li>\n<ol type=\"a\">\n<li>Absolute pressure: 52P, 102P, 12P, or C2P<\/li>\n<li>Gauge pressure : 52PG, 102PG, 12PG, or C2PG<\/li>\n<li>Barometric pressure : 52PB, 102PB, 12PB, or C2PB<\/li>\n<\/ol>\n<\/li>\n<\/ol>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What engineering units are the pressure readings given in?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<ul>\n<li>Barometric pressure and absolute pressure are given in absolute pressure units.<\/li>\n<li>Gauge pressure is given in gauge pressure units.<\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;How do I change between barometric, absolute, and gauge pressure?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>All three can beset separately using the <a href=\"https:\/\/www.alicat.com\/support\/changing-engineering-units-tutorial\/\" target=\"_blank\" rel=\"noopener\">front stand-up interface<\/a>.<\/p>\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Do I need to order custom pressure ranges when I order an -IB unit?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p>No. Since the pressure accuracy is dependent on reading, a smaller range will not make the pressure reading more accurate.<\/p>\n<p>If you need a higher range than the default offers, please <a href=\"https:\/\/www.alicat.com\/contact\/\" target=\"_blank\" rel=\"noopener\">contact an applications engineer<\/a>.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What is the barometric pressure accuracy?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>\u00b10.00725 PSI<\/p>\n<\/div>\n<\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-title\" role=\"button\" tabindex=\"0\"><\/div>\n<\/div>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;What is the gauge pressure accuracy? Absolute pressure?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<ul>\n<li>The gauge pressure accuracy is the uncertainty of the absolute pressure reading plus an additional 0.00725 PSI.<\/li>\n<li>The absolute pressure accuracy can be found in the appropriate <a href=\"https:\/\/www.alicat.com\/technical-reference\/\" target=\"_blank\" rel=\"noopener\">specification sheet.<\/a><\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;I ordered an \u2013IB unit but forgot to order it in closed-loop pressure mode. What do I do?&#8221; _builder_version=&#8221;4.24.3&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<div class=\"main\">\n<section class=\"section-over-top-bg\">\n<div class=\"container width-1130 bg-white\">\n<div class=\"top-text-block-wrap d-flex\">\n<div class=\"text-block\">\n<div id=\"eckb-article-page-container-v2\" class=\"eckb-article-page-content-counter eckb_ap_active_theme_allicat \" data-mobile_breakpoint=\"1000\">\n<div id=\"eckb-article-body\">\n<article id=\"eckb-article-content\" data-article-id=\"21520\">\n<div id=\"eckb-article-content-body\">\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-chevron\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>The control loop variable can easily be changed using the <a href=\"https:\/\/www.alicat.com\/support\/control-loop-variable-tutorial-changing-between-mass-flow-volumetric-flow-or-pressure-control\/\" target=\"_blank\" rel=\"noopener\">front stand-up interface<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>[\/et_pb_accordion_item][\/et_pb_accordion][\/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-40057","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) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Internal Barometer (-IB Sensor) FAQ - Alicat Scientific<\/title>\n<meta name=\"description\" content=\"This article provides answers to common questions regarding Alicat -IB sensors. Fixes, tips, and resources to get your devices running Alicat fast.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alicat.com\/de\/unterstutzung\/barometer-faq\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Internal Barometer (-IB Sensor) FAQ\" \/>\n<meta property=\"og:description\" content=\"This article provides answers to common questions regarding Alicat -IB sensors. 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