{"id":1472,"date":"2023-09-29T15:25:49","date_gmt":"2023-09-29T20:25:49","guid":{"rendered":"http:\/\/blog.wika.com\/us\/\/?p=1472"},"modified":"2023-09-29T15:45:14","modified_gmt":"2023-09-29T20:45:14","slug":"absolute-pressure-gauges-advantages","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/us\/products\/pressure-products\/absolute-pressure-gauges-advantages\/","title":{"rendered":"Absolute Pressure Gauges: Advantages and When to Use Them"},"content":{"rendered":"<p style=\"font-weight: 400\"><strong>While measuring gauge pressure is sufficient for most industrial applications, sometimes it is necessary to use an instrument that displays absolute pressure, as this reading does not fluctuate depending on altitude or weather conditions.<\/strong><\/p>\n<ul>\n<li>The two sides of a filter, to monitor its condition.<\/li>\n<li>Before and after an orifice plate, to measure a liquid\u2019s velocity.<\/li>\n<li>The difference of high pressure and low-pressure tap in a sealed vessel, to measure the liquid level.<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">What might be harder is deciding whether to use an instrument that measures gauge pressure or absolute pressure.<\/p>\n<h2><strong>Comparing Gauge Pressure and Absolute Pressure<\/strong><\/h2>\n<p style=\"font-weight: 400\">Pressure is usually measured by quantifying the deformation of a sensing element, where one side of the element is exposed to a reference pressure and the other side is in contact with the process media. If the reference pressure is atmospheric pressure (also referred to as ambient pressure, air pressure, and barometric pressure), the measurement is called gauge pressure or relative pressure.<\/p>\n<p style=\"font-weight: 400\">If the reference side of the sensor is subjected to a vacuum, the measured value is called absolute pressure. In other words, gauge pressure is zeroed against the atmospheric air pressure (~14.5 psi \/ ~1 bar at sea level) while absolute pressure is zero-referenced against vacuum pressure (0 psi\/bar).<\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:846px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/us\/\/files\/2016\/09\/comparing-gauge-pressure-and-absolute-pressure_5-838x471.png\" \/><p class=\"wp-caption-text\">Comparing gauge pressure and absolute pressure<\/p><\/div>\n    \n<p style=\"font-weight: 400\">\nIn the above graph, if the applied pressure is 100 psi, a pressure gauge would read 100 psi while an absolute pressure gauge would read 114.5 psi absolute.<\/p>\n<p style=\"font-weight: 400\">Thus:<\/p>\n<ul>\n<li>A pressure gauge displays just the applied pressure (above or below the atmospheric pressure).<\/li>\n<li>An absolute pressure gauge displays atmospheric pressure + applied pressure.<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">In countries that use imperial units (mainly the US), the typical unit for pressure is psi (pounds per square inch). This designation usually defaults to gauge pressure, and is sometimes labeled psig (psi gauge).<span> Absolute pressure must be labeled as psia (psi absolute)<\/span>. Regardless of the unit used, WIKA\u2019s absolute pressure gauges have \u201cabsolute pressure\u201d printed on the dial face.<\/p>\n<h2><strong>When to Use a Pressure Gauge vs. Absolute Pressure Gauge<\/strong><\/h2>\n<p style=\"font-weight: 400\">Atmospheric pressure fluctuates depending on a location\u2019s temperature, humidity, and altitude. <span>\u00a0<\/span>For pressure applications that are not affected by changes in atmospheric pressure, a standard pressure gauge should be used. Such applications include h<span>ydraulic pressure, pneumatic pressure, and hydrostatic pressure.<\/span><\/p>\n<p style=\"font-weight: 400\">However, use an absolute pressure gauge when any changes in temperature, humidity, and altitude must be factored into the measurement. These include:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.wika.com\/en-us\/lp_aerospace.WIKA\" rel=\"external\" target=\"_blank\">Aviation and aerospace<\/a> applications<\/li>\n<li>Research, scientific, and <a href=\"https:\/\/www.wika.com\/en-us\/calibration_services.WIKA\" rel=\"external\" target=\"_blank\">calibration<\/a> labs<\/li>\n<li>Vacuum packaging in the <a href=\"https:\/\/www.wika.com\/en-us\/food_and_beverages.WIKA\" rel=\"external\" target=\"_blank\">food and beverage<\/a> and <a href=\"https:\/\/www.wika.com\/en-us\/pharmaceuticals_and_biotechnology.WIKA\" rel=\"external\" target=\"_blank\">pharmaceutical<\/a> industries<\/li>\n<\/ul>\n<p style=\"font-weight: 400\"><span>Ideal for monitoring the high end of a vacuum<\/span>, absolute pressure gauges are referenced to a perfect vacuum. This reference can be either a capsule element inside the gauge, or a gas-tight chamber between the media and the gauge.<\/p>\n<h2><strong>WIKA\u2019s Absolute Pressure Gauges<\/strong><\/h2>\n<p style=\"font-weight: 400\">To ensure proper measurements and the integrity of high-precision process, use a high-quality absolute pressure gauge that fits your application\u2019s conditions.<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:358px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/us\/\/files\/2016\/09\/300_2.75-ab-gauge.png\" \/><p class=\"wp-caption-text\">300-2.75A absolute pressure test gauge<\/p><\/div>\n    \n<p style=\"font-weight: 400\"><strong>Series 300 absolute pressure gauges<br \/>\n<\/strong><span>Available in two nominal sizes, models <\/span><a href=\"https:\/\/www.wika.com\/en-us\/300_2_75a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>300-2.75A<\/span><\/a><span> (2.75<\/span>&#8220;) and <a href=\"https:\/\/www.wika.com\/en-us\/300_6a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>300-6A<\/span><\/a> (6&#8243;) are capsule-type gauges for production and routine testing. The <span>2.75<\/span>&#8221; gauge measure up to 100 psia, while the <span>6<\/span>&#8221; one measures up to 30 psia.<\/p>\n<p style=\"font-weight: 400\"><strong>Series 1000 absolute pressure gauge<br \/>\n<\/strong><span>The <\/span><a href=\"https:\/\/www.wika.com\/en-us\/1000_6a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>1000-6A<\/span><\/a><span> is a heavy-duty 6-inch absolute pressure gauge that can measure up to 500 psia. The references are an evacuated capsule for measurements in the 50 psia range, or an evacuated <\/span><a href=\"https:\/\/blog.wika.com\/us\/\/products\/pressure-products\/eugene-bourdon-history-bourdon-gauge\/\"><span>Bourdon tube<\/span><\/a><span> for measurements in the 100 \u2026 500 psia range.<\/span><\/p>\n<p style=\"font-weight: 400\"><strong>Series 1500 absolute pressure gauge<br \/>\n<\/strong><span>The <\/span><a href=\"https:\/\/www.wika.com\/en-us\/1500_8_5a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>1500-8.5A<\/span><\/a><span> is our largest <\/span>(8.5&#8243;)<span>, top-of-the-line capsule-type absolute pressure gauge. It is rugged enough to maintain a \u00b10.067% FS accuracy for high-sensitivity testing and production.<\/span><\/p>\n<p style=\"font-weight: 400\"><span>Note: Capsule-type gauges are used with dry gaseous media only, as liquids trapped inside the sensing element can create a hydrostatic load that inflates the pressure reading.<\/span><\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/us\/\/files\/2016\/09\/absolute-pressure-gauge-with-diaphragm-element-388x410.png\" \/><p class=\"wp-caption-text\">Absolute pressure gauge with diaphragm element<\/p><\/div>\n    \n<p style=\"font-weight: 400\"><strong>Absolute pressure gauge with diaphragm element<br \/>\n<\/strong><span style=\"font-size: 1rem\">To measure the absolute pressure of wet gases, liquids, or aggressive media, use an absolute pressure gauge whose vacuum reference is isolated from the sensing element. Model <\/span><a style=\"font-size: 1rem\" href=\"https:\/\/www.wika.com\/en-us\/532_52_532_53_532_54.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\">532.5X<\/a><span style=\"font-size: 1rem\">, a specialized type of <\/span><a style=\"font-size: 1rem\" href=\"https:\/\/blog.wika.com\/us\/\/knowhow\/three-reasons-to-use-a-diaphragm-pressure-gauge\/\">diaphragm pressure gauge<\/a><span style=\"font-size: 1rem\">, are stainless-steel absolute pressure gauge with ranges as low as 0 \u2026 20 mmHg absolute up to 0 \u2026 300 psia and with high overload safety.<\/span><\/p>\n<p style=\"font-weight: 400\"><span>The diaphragm element is located beneath an evacuated (vacuum) reference chamber. As the gas or liquid travels up the stem and enters the media chamber, it deflects the diaphragm, which pushes the link that moves the instrument pointer.<\/span><\/p>\n<p style=\"font-weight: 400\"><span>For extra functionality, WIKA pairs the 532.5X absolute pressure gauge with switch contacts. Model <\/span><a href=\"https:\/\/www.wika.com\/en-us\/532_53_8xx.WIKA?36449=36449_2\" rel=\"external\" target=\"_blank\"><span>532.53+8xx<\/span><\/a><span> is ideal for monitoring and controlling vacuum pumps, packing machines, and applications that need to determine the vapor pressure in liquids. Model <\/span><a href=\"https:\/\/www.wika.com\/en-us\/apgt43_100_apgt43_160.WIKA?36410=36410_2\" rel=\"external\" target=\"_blank\"><span>APGT43<\/span><\/a><span> is our 532.54 absolute pressure gauge integrated with an electronic sensor for signal transmission. Dubbed the intelliGAUGE\u00ae, this device combines mA and V signal output with a local mechanical display that remains readable during power outages.<\/span><\/p>\n<h2><strong>Smart Pressure Solutions for Industrial Applications<\/strong><\/h2>\n<p style=\"font-weight: 400\">In addition to these high-quality <span>absolute pressure gauges, WIKA also offers an array of <\/span><a href=\"https:\/\/www.wika.com\/en-us\/digital_pressure_gauges-2.WIKA\" rel=\"external\" target=\"_blank\"><span>digital pressure gauges<\/span><\/a><span>, <\/span><a href=\"https:\/\/www.wika.com\/en-us\/pressure_sensors.WIKA?36407=36407_0\" rel=\"external\" target=\"_blank\"><span>pressure sensors<\/span><\/a><span>, and <\/span><a href=\"https:\/\/www.wika.com\/en-us\/process_transmitters.WIKA?36468=36468_0\" rel=\"external\" target=\"_blank\"><span>pressure transmitters<\/span><\/a><span> that can measure absolute pressure. <\/span><\/p>\n<p style=\"font-weight: 400\"><span>We understand that with all the variables that go into selecting pressure instruments, it can be difficult to decide which ones are right for your particular application. For customized advice, contact the pressure specialists at WIKA USA.<\/span><\/p>\n<p style=\"font-weight: 400\"><span>\u00a0<\/span><\/p>\n<p><strong>Products mentioned in this blog:<br \/>\n\u2022 <\/strong><span style=\"font-weight: 400\"><a href=\"https:\/\/www.wika.com\/en-us\/300_2_75a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>300-2.75A<\/span><\/a><span> (2.75<\/span><\/span><span style=\"font-weight: 400\">&#8220;) absolute pressure gauge<br \/>\n<\/span><strong>\u2022 <\/strong><span style=\"font-weight: 400\"><a href=\"https:\/\/www.wika.com\/en-us\/300_6a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>300-6A<\/span><\/a><\/span><span style=\"font-weight: 400\"> (6&#8243;) absolute pressure gauge<br \/>\n<\/span><span style=\"font-weight: 400\">\u2022 <\/span><span style=\"font-weight: 400\"><a href=\"https:\/\/www.wika.com\/en-us\/1000_6a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>1000-6A<\/span><\/a> <\/span><span style=\"font-weight: 400\">(6&#8243;) absolute pressure gauge<br \/>\n\u2022 <\/span><span style=\"font-weight: 400\"><a href=\"https:\/\/www.wika.com\/en-us\/1500_8_5a.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>1500-8.5A<\/span><\/a> <\/span><span style=\"font-weight: 400\">(8.5&#8243;)<\/span><span style=\"font-weight: 400\"> absolute pressure gauge<br \/>\n\u2022 <\/span><span style=\"font-weight: 400\"><a href=\"https:\/\/www.wika.com\/en-us\/532_52_532_53_532_54.WIKA?36398=36398_2\" rel=\"external\" target=\"_blank\"><span>532.52, 532.53, 532.54<\/span><\/a><span> stainless-steel absolute pressure gauge<br \/>\n\u2022 <\/span><a href=\"https:\/\/www.wika.com\/en-us\/532_53_8xx.WIKA?36449=36449_2\" rel=\"external\" target=\"_blank\"><span>532.53+8xx<\/span><\/a><span> absolute pressure gauge with switch contacts<br \/>\n\u2022 <\/span><a href=\"https:\/\/www.wika.com\/en-us\/apgt43_100_apgt43_160.WIKA?36410=36410_2\" rel=\"external\" target=\"_blank\"><span>APGT43<\/span><\/a><span> absolute pressure gauge with output signal (intelliGAUGE<sup>\u00ae<\/sup>)<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span>[contact-form-7 id=&#8221;14552&#8243; title=&#8221;Blog Contact Form&#8221;]<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>While measuring gauge pressure is sufficient for most industrial applications, sometimes it is necessary to use an instrument that displays absolute pressure, as this reading does not fluctuate depending on altitude or weather conditions. The two sides of a filter, to monitor its condition. Before and after an orifice plate, to measure a liquid\u2019s velocity. [&hellip;]<\/p>\n","protected":false},"author":187,"featured_media":17267,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5,220],"tags":[676,550,411,687],"class_list":["post-1472","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","category-pressure-products","tag-applications","tag-pressure","tag-pressure-gauges","tag-pressure-measurement"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Absolute Pressure Gauges: Advantages and When to Use Them - WIKA blog<\/title>\n<meta name=\"description\" content=\"Gauges that measure absolute pressure \u2013 rather than gauge pressure \u2013 are essential instruments in test laboratories, vacuum packaging, aviation\/aerospace, and closed systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/us\/products\/pressure-products\/absolute-pressure-gauges-advantages\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Absolute Pressure Gauges: Advantages and When to Use Them - 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