{"id":2686,"date":"2022-07-18T15:28:56","date_gmt":"2022-07-18T07:28:56","guid":{"rendered":"https:\/\/sj-gauge.com\/?p=2686"},"modified":"2026-04-25T22:16:42","modified_gmt":"2026-04-25T14:16:42","slug":"pressure-gauge-accuracy","status":"publish","type":"post","link":"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-accuracy\/","title":{"rendered":"\u0110\u1ed9 ch\u00ednh x\u00e1c v\u00e0 sai s\u1ed1 dung sai c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t kim"},"content":{"rendered":"<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t kim l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p v\u00e0 qu\u00e1 tr\u00ecnh ra quy\u1ebft \u0111\u1ecbnh!<\/strong><\/p>\n\n\n\n<p>C\u00e1c \u0111\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t kh\u00f4ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn sai s\u00f3t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p ho\u1eb7c c\u00e1c quy\u1ebft \u0111\u1ecbnh li\u00ean quan \u0111\u1ebfn gi\u1edbi h\u1ea1n ph\u1ea1m vi \u00e1p su\u1ea5t, c\u00f3 th\u1ec3 g\u00e2y ra h\u1eadu qu\u1ea3 th\u1ea3m kh\u1ed1c. D\u00f9 quy tr\u00ecnh \u0111o l\u01b0\u1eddng c\u00f3 ch\u00ednh x\u00e1c \u0111\u1ebfn \u0111\u00e2u hay ng\u01b0\u1eddi v\u1eadn h\u00e0nh c\u00f3 c\u1ea9n th\u1eadn \u0111\u1ebfn m\u1ee9c n\u00e0o, n\u1ebfu \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t b\u1ecb \u1ea3nh h\u01b0\u1edfng, sai s\u00f3t s\u1ebd x\u1ea3y ra.<\/p>\n\n\n\n<p>\u0110\u00e2y l\u00e0 l\u00fac m\u1ed9t nh\u00e0 cung c\u1ea5p thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng chuy\u00ean nghi\u1ec7p s\u1ebd th\u1ef1c hi\u1ec7n vi\u1ec7c hi\u1ec7u chu\u1ea9n \u00e1p su\u1ea5t cho b\u1ea1n.<\/p>\n\n\n\n<p>B\u1ea1n quan t\u00e2m \u0111\u1ebfn vi\u1ec7c t\u00ecm hi\u1ec3u c\u00e1ch hi\u1ec7u chu\u1ea9n c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t b\u1eb1ng \u0111\u1ed3ng h\u1ed3?<\/p>\n\n\n\n<p>Trong b\u00e0i vi\u1ebft sau \u0111\u00e2y, SJ Gauge s\u1ebd gi\u1edbi thi\u1ec7u cho b\u1ea1n v\u1ec1 c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 sai s\u1ed1 dung sai c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t kim, gi\u1ea3i th\u00edch t\u1ea1i sao \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n. Ch\u00fang t\u00f4i s\u1ebd k\u00e8m theo nh\u1eefng v\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 hi\u1ec3u \u0111\u1ec3 gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n.<\/p>\n\n\n\n<p>N\u1ebfu b\u1ea1n quan t\u00e2m, b\u1ea1n c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c \u0111\u1ecdc b\u00e0i vi\u1ebft n\u00e0y ho\u1eb7c li\u00ean h\u1ec7 tr\u1ef1c ti\u1ebfp v\u1edbi ch\u00fang t\u00f4i. \u0110\u1ed9i ng\u0169 b\u00e1n h\u00e0ng chuy\u00ean nghi\u1ec7p c\u1ee7a SJ Gauge c\u0169ng c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p \u0111o \u00e1p su\u1ea5t ph\u00f9 h\u1ee3p nh\u1ea5t cho \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n!<\/p>\n<\/blockquote>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"B\u1eadt\/t\u1eaft M\u1ee5c l\u1ee5c\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">B\u1eadt\/T\u1eaft<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #7b1e1c;color:#7b1e1c\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #7b1e1c;color:#7b1e1c\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-accuracy\/#1-what-does-%e2%80%9caccuracy%e2%80%9d-mean-in-dial-pressure-gauges-understanding-the-definitions-of-terms-related-to-pressure-calibration\" >1. \u201c\u0110\u1ed9 ch\u00ednh x\u00e1c\u201d c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t? Hi\u1ec3u c\u00e1c \u0111\u1ecbnh ngh\u0129a c\u1ee7a c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan \u0111\u1ebfn hi\u1ec7u chu\u1ea9n \u00e1p su\u1ea5t.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-accuracy\/#2-what-is-pressure-calibration-why-do-instruments-need-calibration\" >2. Calibration \u00e1p su\u1ea5t l\u00e0 g\u00ec? T\u1ea1i sao c\u00e1c thi\u1ebft b\u1ecb c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-accuracy\/#3-introduction-to-sj-gauges-comprehensive-instrument-calibration-process-before-and-after-delivery\" >3. Gi\u1edbi thi\u1ec7u v\u1ec1 quy tr\u00ecnh hi\u1ec7u chu\u1ea9n thi\u1ebft b\u1ecb to\u00e0n di\u1ec7n c\u1ee7a SJ Gauge tr\u01b0\u1edbc v\u00e0 sau khi giao h\u00e0ng.<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-53b883f0ef6d6a809a03144b3f527ab6\" id=\"h-1-what-does-accuracy-mean-in-dial-pressure-gauges-understanding-the-definitions-of-terms-related-to-pressure-calibration\"><span class=\"ez-toc-section\" id=\"1-what-does-%e2%80%9caccuracy%e2%80%9d-mean-in-dial-pressure-gauges-understanding-the-definitions-of-terms-related-to-pressure-calibration\"><\/span>1. \u201c\u0110\u1ed9 ch\u00ednh x\u00e1c\u201d c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t? Hi\u1ec3u c\u00e1c \u0111\u1ecbnh ngh\u0129a c\u1ee7a c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan \u0111\u1ebfn hi\u1ec7u chu\u1ea9n \u00e1p su\u1ea5t.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-accuracy-what-does-accuracy-mean-in-a-dial-pressure-gauge\">a. \u0110\u1ed9 ch\u00ednh x\u00e1c<br>\u0110\u1ed9 ch\u00ednh x\u00e1c c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t kim?<\/h3>\n\n\n\n<p>\u0110\u1ed9 ch\u00ednh x\u00e1c l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa \u201c\u0111\u1ed9 ch\u00ednh x\u00e1c\u201d v\u00e0 \u201c\u0111\u1ed9 l\u1eb7p l\u1ea1i\u201d, th\u1ec3 hi\u1ec7n m\u1ee9c \u0111\u1ed9 g\u1ea7n \u0111\u00fang ho\u1eb7c sai l\u1ec7ch gi\u1eefa gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t \u0111\u01b0\u1ee3c \u0111o (gi\u00e1 tr\u1ecb quan s\u00e1t ho\u1eb7c \u0111\u1ecdc \u0111\u01b0\u1ee3c) v\u00e0 gi\u00e1 tr\u1ecb th\u1ef1c c\u1ee7a n\u00f3.<\/p>\n\n\n\n<p>\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng ph\u1ea7n tr\u0103m c\u1ee7a \u0111\u1ed9 ch\u00ednh x\u00e1c to\u00e0n thang \u0111o (F.S.) (\u00b1 \u0111\u1ed9 ch\u00ednh x\u00e1c %). \u0110\u1ed9 ch\u00ednh x\u00e1c cao \u0111\u1ed3ng ngh\u0129a v\u1edbi m\u1ee9c \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-b-accuracy-grade-what-does-accuracy-grade-mean-in-a-dial-pressure-gauge\">b. \u0110\u1ed9 ch\u00ednh x\u00e1c<br>\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ea5p \u0111\u1ed9 c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t?<\/h3>\n\n\n\n<p>\u0110\u1ed9 ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m dung sai cho ph\u00e9p trong ph\u1ea1m vi \u0111o c\u1ee7a thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng. Vi\u1ec7n Ti\u00eau chu\u1ea9n Anh (BSI) th\u01b0\u1eddng chia th\u00e0nh b\u1ea3y c\u1ea5p \u0111\u1ed9 ph\u1ea7n tr\u0103m: 0,5, 1, 1,5 (ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u 1,6), 2, 2,5, 3, 4, v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb nh\u1ecf h\u01a1n cho th\u1ea5y \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n. Theo Hi\u1ec7p h\u1ed9i K\u1ef9 s\u01b0 C\u01a1 kh\u00ed Hoa K\u1ef3 (ASME), c\u00f3 th\u00eam b\u1ea3y c\u1ea5p \u0111\u1ed9: 4A, 3A, 2A, A, B, C, D.<\/p>\n\n\n\n<p>T\u1ef7 l\u1ec7 ch\u00ednh x\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00e8m theo k\u00fd hi\u1ec7u R (\u0111\u1ecdc) ho\u1eb7c F.S.. N\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c ghi ch\u00fa c\u1ee5 th\u1ec3, n\u00f3 \u0111\u01b0\u1ee3c coi l\u00e0 \u00b1 ch\u00ednh x\u00e1c % F.S. Vi\u1ec7c s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u R \u0111\u01b0\u1ee3c d\u00e0nh ri\u00eang cho c\u00e1c thi\u1ebft b\u1ecb y\u00eau c\u1ea7u \u0111o l\u01b0\u1eddng ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-european-standard\">Ti\u00eau chu\u1ea9n Ch\u00e2u \u00c2u:<\/h3>\n\n\n\n<p>Ti\u00eau chu\u1ea9n BS EN 837-1 quy \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t v\u00e0 c\u00e1c c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c (nh\u01b0 \u0111\u01b0\u1ee3c chi ti\u1ebft trong b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y).<\/p>\n\n\n\n<figure class=\"wp-block-flexible-table-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td colspan=\"8\">K\u00edch th\u01b0\u1edbc danh ngh\u0129a so v\u1edbi l\u1edbp ch\u00ednh x\u00e1c<\/td><\/tr><tr><td rowspan=\"2\">K\u00edch th\u01b0\u1edbc danh ngh\u0129a<br>(mm)<\/td><td colspan=\"7\">L\u1edbp ch\u00ednh x\u00e1c (Ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u)<\/td><\/tr><tr><td>0.1<\/td><td>0.25<\/td><td>0.5<\/td><td>1.0<\/td><td>1.6<\/td><td>2.5<\/td><td>4<\/td><\/tr><tr><td>40, 50<\/td><td><\/td><td><\/td><td><\/td><td><\/td><td>V<\/td><td>V<\/td><td>V<\/td><\/tr><tr><td>63<\/td><td><\/td><td><\/td><td><\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><\/tr><tr><td>80<\/td><td><\/td><td><\/td><td><\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><\/tr><tr><td>100<\/td><td><\/td><td><\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><td><\/td><\/tr><tr><td>150, 100<\/td><td><\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><td><\/td><td><\/td><\/tr><tr><td>250<\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><td>V<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-american-standard\">Ti\u00eau chu\u1ea9n M\u1ef9:<\/h3>\n\n\n\n<p>Tham kh\u1ea3o b\u1ea3ng ph\u00e2n lo\u1ea1i \u0111\u1ed9 ch\u00ednh x\u00e1c th\u00f4ng d\u1ee5ng \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ASME B40.100:<\/p>\n\n\n\n<figure class=\"wp-block-flexible-table-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td colspan=\"5\">C\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c<\/td><\/tr><tr><td rowspan=\"3\">\u0110\u1ed9 ch\u00ednh x\u00e1c<br>(Ti\u00eau chu\u1ea9n M\u1ef9)<\/td><td colspan=\"3\">L\u1ed7i cho ph\u00e9p<br>(Ph\u1ea7n tr\u0103m c\u1ee7a d\u1ea3i \u0111o \u00b1 % so v\u1edbi gi\u00e1 tr\u1ecb \u0111\u1ea7y \u0111\u1ee7)<br>(Kh\u00f4ng bao g\u1ed3m ma s\u00e1t)<\/td><td rowspan=\"3\">K\u00edch th\u01b0\u1edbc gauge t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb<br>(Cung kim \u0111\u1ed3ng h\u1ed3 270 \u0111\u1ed9)<\/td><\/tr><tr><td colspan=\"3\">Ph\u1ea1m vi quy m\u00f4<\/td><\/tr><tr><td>1\/4 d\u01b0\u1edbi c\u00f9ng c\u1ee7a thang \u0111o<\/td><td>N\u1eeda gi\u1eefa c\u1ee7a thang \u0111o<\/td><td>1\/4 ph\u1ea7n tr\u00ean c\u1ee7a t\u1ef7 l\u1ec7<\/td><\/tr><tr><td>4A<\/td><td colspan=\"3\">\u21900,1\u2192<\/td><td>8\u00bd (8,5 inch ho\u1eb7c 216 mm)<\/td><\/tr><tr><td>3A<\/td><td colspan=\"3\">\u21900,25\u2192<\/td><td>4\u00bd (4,5 inch ho\u1eb7c 114 mm)<\/td><\/tr><tr><td>2A<\/td><td colspan=\"3\">\u21900,5\u2192<\/td><td>2\u00bd (2,5 inch ho\u1eb7c 63 mm)<\/td><\/tr><tr><td>A<\/td><td colspan=\"3\">\u21901.0\u2192<\/td><td rowspan=\"4\">1\u00bd (1,5 inch ho\u1eb7c 40 mm)<\/td><\/tr><tr><td>B<\/td><td>3.0<\/td><td>2.0<\/td><td>3.0<\/td><\/tr><tr><td>C<\/td><td>4.0<\/td><td>3.0<\/td><td>4.0<\/td><\/tr><tr><td>D<\/td><td colspan=\"3\">5.0<\/td><\/tr><\/tbody><\/table><figcaption>L\u01b0u \u00fd: C\u00e1c \u0111\u1ed3ng h\u1ed3 \u0111o c\u1ea5p 4A ph\u1ea3i n\u1eb1m trong gi\u1edbi h\u1ea1n dung sai quy \u0111\u1ecbnh tr\u01b0\u1edbc v\u00e0 sau khi \u0111\u01b0\u1ee3c g\u00f5 nh\u1eb9.<\/figcaption><\/figure>\n\n\n\n<p>Tham kh\u1ea3o b\u1ea3ng tr\u00ean, ch\u00fang ta h\u00e3y t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c t\u1ed1i \u01b0u\/c\u00e1c c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c theo ti\u00eau chu\u1ea9n M\u1ef9 v\u00e0 Ch\u00e2u \u00c2u \u0111\u1ed1i v\u1edbi k\u00edch th\u01b0\u1edbc m\u1eb7t \u0111\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t li\u00ean quan \u0111\u1ebfn d\u1ea3i \u00e1p su\u1ea5t. H\u00e3y l\u1ea5y m\u1ed9t v\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 minh h\u1ecda:<\/p>\n\n\n\n<p><strong>K\u00edch th\u01b0\u1edbc m\u1eb7t s\u1ed1: 100mm<\/strong><br>\u0110\u1ed1i v\u1edbi \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u00f3 m\u1eb7t s\u1ed1 k\u00edch th\u01b0\u1edbc 100mm, \u0111\u1ed9 ch\u00ednh x\u00e1c t\u1ed1i \u01b0u c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u00e0 0.25% theo ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u v\u00e0 2A theo ti\u00eau chu\u1ea9n M\u1ef9.<\/p>\n\n\n\n<p><strong>K\u00edch th\u01b0\u1edbc m\u1eb7t s\u1ed1: 250mm<\/strong><br>\u0110\u1ed1i v\u1edbi \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u00f3 \u0111\u01b0\u1eddng k\u00ednh m\u1eb7t \u0111\u1ed3ng h\u1ed3 250mm, \u0111\u1ed9 ch\u00ednh x\u00e1c t\u1ed1i \u01b0u c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u00e0 0,1% theo ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u v\u00e0 4A theo ti\u00eau chu\u1ea9n M\u1ef9.<\/p>\n\n\n\n<p>T\u1eeb hai v\u00ed d\u1ee5 n\u00e0y, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf v\u00e0 \u0111\u1ed9 l\u1edbn c\u1ee7a sai s\u1ed1 dung sai kh\u00f4ng ch\u1ec9 li\u00ean quan \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c m\u00e0 c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o d\u1ea3i \u0111o v\u00e0 k\u00edch th\u01b0\u1edbc m\u1eb7t s\u1ed1 c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t.<br>Khi ph\u1ea1m vi v\u00e0 k\u00edch th\u01b0\u1edbc \u0111\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t gi\u1ed1ng nhau, \u0111\u1ed9 ch\u00ednh x\u00e1c c\u00e0ng cao th\u00ec sai s\u1ed1 cho ph\u00e9p c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t c\u00e0ng nh\u1ecf.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-c-tolerance-permissible-error\">c. \u0110\u1ed9 dung sai (L\u1ed7i cho ph\u00e9p)<\/h3>\n\n\n\n<p>\u0110\u1ed9 dung sai \u0111\u1ea1i di\u1ec7n cho \u201cl\u1ed7i t\u1ed1i \u0111a cho ph\u00e9p c\u1ee7a d\u1eef li\u1ec7u \u0111o so v\u1edbi gi\u00e1 tr\u1ecb chu\u1ea9n\u201d v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u0111\u01a1n v\u1ecb \u0111o \u00e1p su\u1ea5t.<br>V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u00f3 d\u1ea3i \u0111o t\u1eeb 0 \u0111\u1ebfn 100 psi v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c \u00b11% F.S. c\u00f3 \u0111\u1ed9 dung sai \u00b11.0 psi t\u1ea1i b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o tr\u00ean thang \u0111o.<br>Tham kh\u1ea3o ti\u00eau chu\u1ea9n BS EN 837-1, quy \u0111\u1ecbnh gi\u1edbi h\u1ea1n dung sai t\u1ed1i \u0111a cho t\u1eebng c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<figure class=\"wp-block-flexible-table-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td colspan=\"2\">L\u1ed7i t\u1ed1i \u0111a cho ph\u00e9p<\/td><\/tr><tr><td>C\u00e1c l\u1edbp \u0111\u1ed9 ch\u00ednh x\u00e1c (Ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u)<\/td><td>Gi\u1edbi h\u1ea1n sai s\u1ed1 cho ph\u00e9p <br>(t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m c\u1ee7a kho\u1ea3ng c\u00e1ch)<\/td><\/tr><tr><td>0.1<\/td><td>\u00b1 0,1 % F.S.<\/td><\/tr><tr><td>0.25<\/td><td>\u00b1 0,25 % F.S.<\/td><\/tr><tr><td>0.6<\/td><td>\u00b1 0,6 % F.S.<\/td><\/tr><tr><td>1.0<\/td><td>\u00b1 1.0 % F.S.<\/td><\/tr><tr><td>1.6<\/td><td>\u00b1 1,6 % F.S.<\/td><\/tr><tr><td>2.5<\/td><td>\u00b1 2,5 % F.S.<\/td><\/tr><tr><td>4.0<\/td><td>\u00b1 4,01 TP3T F.S.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>T\u00f3m l\u1ea1i, ch\u00fang ta c\u00f3 th\u1ec3 minh h\u1ecda s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c thu\u1eadt ng\u1eef n\u00e0y b\u1eb1ng m\u1ed9t v\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1ea3i \u0111o: 0 \u2026 10 psi<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: \u00b11.5% F.S.<\/li>\n<\/ul>\n\n\n\n<p>C\u00e1ch t\u00ednh dung sai \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u01b0 sau:<\/p>\n\n\n\n<p>10 psi (D\u1ea3i \u0111o) \u00d7 \u00b11,51 TP3T F.S. (\u0110\u1ed9 ch\u00ednh x\u00e1c) = \u00b10,15 psi (\u0110\u1ed9 dung sai).<\/p>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 khi \u00e1p su\u1ea5t th\u1ef1c t\u1ebf l\u00e0 6 psi, ph\u1ea1m vi dung sai cho ph\u00e9p n\u1eb1m trong kho\u1ea3ng t\u1eeb 5,85 psi \u0111\u1ebfn 6,15 psi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-a0a24754607382e43c54b54546405406\" id=\"h-2-what-is-pressure-calibration-why-do-instruments-need-calibration\"><span class=\"ez-toc-section\" id=\"2-what-is-pressure-calibration-why-do-instruments-need-calibration\"><\/span>2. Calibration \u00e1p su\u1ea5t l\u00e0 g\u00ec? T\u1ea1i sao c\u00e1c thi\u1ebft b\u1ecb c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-pressure-calibration\">\u0110\u1ecbnh chu\u1ea9n \u00e1p su\u1ea5t l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p>\u0110i\u1ec1u ch\u1ec9nh l\u00e0 qu\u00e1 tr\u00ecnh \u0111i\u1ec1u ch\u1ec9nh v\u00e0 ki\u1ec3m tra \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u00e1p su\u1ea5t hi\u1ec3n th\u1ecb tr\u00ean thi\u1ebft b\u1ecb n\u1eb1m trong ph\u1ea1m vi \u0111\u1ed9 ch\u00ednh x\u00e1c quy \u0111\u1ecbnh.<\/p>\n\n\n\n<p>Trong qu\u00e1 tr\u00ecnh hi\u1ec7u chu\u1ea9n, ch\u00fang t\u00f4i \u0111\u1eb7t \u0111\u1ed3ng h\u1ed3 \u0111o n\u00e0y v\u00e0 m\u1ed9t \u0111\u1ed3ng h\u1ed3 \u0111o kh\u00e1c (\u0111\u1ed3ng h\u1ed3 \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n) v\u00e0o m\u1ed9t h\u1ec7 th\u1ed1ng ri\u00eang bi\u1ec7t, n\u01a1i c\u1ea3 hai \u0111\u1ec1u ch\u1ecbu c\u00f9ng m\u1ed9t \u00e1p su\u1ea5t. Sau \u0111\u00f3, ch\u00fang t\u00f4i so s\u00e1nh c\u00e1c gi\u00e1 tr\u1ecb hi\u1ec3n th\u1ecb c\u1ee7a ch\u00fang. B\u1ea5t k\u1ef3 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0o gi\u1eefa ch\u00fang \u0111\u1ec1u \u0111\u01b0\u1ee3c ghi ch\u00fa v\u00e0 bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng ph\u1ea7n tr\u0103m c\u1ee7a d\u1ea3i \u0111o to\u00e0n ph\u1ea7n c\u1ee7a \u0111\u1ed3ng h\u1ed3.<\/p>\n\n\n\n<p>Hi\u1ec7p h\u1ed9i K\u1ef9 s\u01b0 C\u01a1 kh\u00ed Hoa K\u1ef3 (ASME) khuy\u1ebfn ngh\u1ecb r\u1eb1ng th\u01b0\u1edbc \u0111o chu\u1ea9n d\u00f9ng \u0111\u1ec3 hi\u1ec7u chu\u1ea9n ph\u1ea3i c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao g\u1ea5p \u00edt nh\u1ea5t b\u1ed1n l\u1ea7n so v\u1edbi th\u01b0\u1edbc \u0111o \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra. Ch\u00fang ta th\u01b0\u1eddng g\u1ecdi \u0111\u00e2y l\u00e0 t\u1ef7 l\u1ec7 4:1. \u0110i\u1ec1u n\u00e0y t\u01b0\u01a1ng t\u1ef1 nh\u01b0 vi\u1ec7c \u0111\u1ea3m b\u1ea3o c\u00f4ng c\u1ee5 \u0111o l\u01b0\u1eddng c\u1ee7a ch\u00fang ta c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ef1c cao \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a thi\u1ebft b\u1ecb \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-instrument-under-test\">Thi\u1ebft b\u1ecb \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1ea3i \u0111o: 0 \u2026 10 psi<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: \u00b11.0% F.S.<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: 10 psi (D\u1ea3i \u0111o) \u00d7 \u00b11,01 TP3T F.S. (\u0110\u1ed9 ch\u00ednh x\u00e1c) = \u00b10,1 psi (\u0110\u1ed9 ch\u00ednh x\u00e1c)<\/li>\n\n\n\n<li>1\/4 c\u1ee7a \u0110\u1ed9 dung sai: \u00b10.1 psi (\u0110\u1ed9 dung sai) \u00d7 1\/4 = \u00b10.025 psi<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-calibration-standard-gauge-a\">Thi\u1ebft b\u1ecb \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n A<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1ea3i \u0111o: 0 \u2026 30 psi<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: \u00b10.1% F.S.<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: 30 psi (D\u1ea3i \u0111o) \u00d7 \u00b10,11 TP3T F.S. (\u0110\u1ed9 ch\u00ednh x\u00e1c) = \u00b10,03 psi (\u0110\u1ed9 ch\u00ednh x\u00e1c)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-calibration-standard-gauge-b\">Thi\u1ebft b\u1ecb \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n B<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1ea3i \u0111o: 0 \u2026 20 psi<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: \u00b10.1% F.S.<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: 20 psi (D\u1ea3i \u0111o) \u00d7 \u00b10,11 TP3T F.S. (\u0110\u1ed9 ch\u00ednh x\u00e1c) = \u00b10,02 psi (\u0110\u1ed9 ch\u00ednh x\u00e1c)<\/li>\n<\/ul>\n\n\n\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a Th\u01b0\u1edbc \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n A kh\u00f4ng nh\u1ecf h\u01a1n 1\/4 gi\u00e1 tr\u1ecb \u0111\u1ed9 ch\u00ednh x\u00e1c cho ph\u00e9p (\u00b10.025psi), nh\u01b0ng Th\u01b0\u1edbc \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n B \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u.<\/p>\n\n\n\n<p>Do \u0111\u00f3, n\u00ean s\u1eed d\u1ee5ng Th\u01b0\u1edbc \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n B \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u hi\u1ec7u chu\u1ea9n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-do-pressure-instruments-need-calibration\">T\u1ea1i sao c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n?<\/h3>\n\n\n\n<p>C\u00e1c \u0111o l\u01b0\u1eddng \u0111\u00e1ng tin c\u1eady v\u00e0 d\u1eef li\u1ec7u \u00e1p su\u1ea5t ch\u00ednh x\u00e1c g\u00f3p ph\u1ea7n n\u00e2ng cao hi\u1ec7u qu\u1ea3 s\u1ea3n xu\u1ea5t, gi\u1ea3m thi\u1ec3u r\u1ee7i ro ng\u1eebng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9t ng\u1ed9t v\u00e0 t\u1ea1o n\u1ec1n t\u1ea3ng \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u m\u00f4i tr\u01b0\u1eddng. \u0110i\u1ec1u n\u00e0y, t\u1eeb \u0111\u00f3, t\u1ed1i \u01b0u h\u00f3a l\u1ee3i nhu\u1eadn th\u00f4ng qua s\u1ea3n xu\u1ea5t hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n\n\n\n<p>Ngay c\u1ea3 nh\u1eefng \u0111\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t ch\u1ea5t l\u01b0\u1ee3ng cao nh\u1ea5t c\u0169ng c\u00f3 th\u1ec3 m\u1ea5t \u0111i m\u1ed9t ph\u1ea7n \u0111\u1ed9 ch\u00ednh x\u00e1c theo th\u1eddi gian. \u0110\u1ec3 duy tr\u00ec \u0111\u1ed9 tin c\u1eady t\u1ed1i \u01b0u cho c\u00e1c thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n, vi\u1ec7c hi\u1ec7u chu\u1ea9n \u0111\u1ecbnh k\u1ef3 v\u00e0 b\u1ea3o d\u01b0\u1ee1ng chuy\u00ean nghi\u1ec7p l\u00e0 \u0111i\u1ec1u kh\u00f4ng th\u1ec3 thi\u1ebfu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-when-should-pressure-instruments-undergo-calibration\">Khi n\u00e0o c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n?<\/h3>\n\n\n\n<p>M\u1ed9t s\u1ed1 t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn y\u00eau c\u1ea7u hi\u1ec7u chu\u1ea9n:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u00e1c thi\u1ebft b\u1ecb m\u1edbi: M\u1edbi ra kh\u1ecfi nh\u00e0 m\u00e1y, ch\u00fang c\u1ea7n \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n.<\/li>\n\n\n\n<li>C\u00e1c thi\u1ebft b\u1ecb \u0111\u00e3 qua s\u1eed d\u1ee5ng: C\u1ea7n hi\u1ec7u chu\u1ea9n \u0111\u1ecbnh k\u1ef3 n\u1ebfu s\u1eed d\u1ee5ng qu\u00e1 m\u1ed9t n\u0103m.<\/li>\n\n\n\n<li>C\u00e1c ph\u00e9p \u0111o quan tr\u1ecdng: C\u00e2n ch\u1ec9nh tr\u01b0\u1edbc v\u00e0 sau khi thu th\u1eadp d\u1eef li\u1ec7u quan tr\u1ecdng.<\/li>\n\n\n\n<li>T\u00e1c \u0111\u1ed9ng m\u00f4i tr\u01b0\u1eddng: C\u1ea7n hi\u1ec7u chu\u1ea9n c\u00e1c thi\u1ebft b\u1ecb sau khi ti\u1ebfp x\u00fac v\u1edbi c\u00e1c s\u1ef1 c\u1ed1 nh\u01b0 rung \u0111\u1ed9ng m\u1ea1nh ho\u1eb7c va ch\u1ea1m.<\/li>\n\n\n\n<li>Hi\u1ec3n th\u1ecb nghi ng\u1edd: N\u1ebfu b\u1ea1n nghi ng\u1edd c\u00f3 sai s\u00f3t, n\u00ean hi\u1ec7u chu\u1ea9n.<\/li>\n\n\n\n<li>Y\u00eau c\u1ea7u c\u1ee5 th\u1ec3: Vi\u1ec7c hi\u1ec7u chu\u1ea9n c\u00f3 th\u1ec3 c\u1ea7n thi\u1ebft theo y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng ho\u1eb7c nh\u00e0 s\u1ea3n xu\u1ea5t.<\/li>\n<\/ul>\n\n\n\n<p>Trong t\u1ea5t c\u1ea3 c\u00e1c t\u00ecnh hu\u1ed1ng n\u00e0y, c\u00f3 kh\u1ea3 n\u0103ng x\u1ea3y ra sai s\u1ed1 trong k\u1ebft qu\u1ea3 \u0111o. N\u00ean g\u1eedi ngay c\u00e1c thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n \u0111\u1ebfn m\u1ed9t nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 \u0111\u00e1ng tin c\u1eady nh\u01b0 SJ Gauge \u0111\u1ec3 hi\u1ec7u chu\u1ea9n v\u00e0 b\u1ea3o tr\u00ec thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-45c78580ed8c0fbcf22c44709f4b7fd4\" id=\"h-3-introduction-to-sj-gauge-s-comprehensive-instrument-calibration-process-before-and-after-delivery\"><span class=\"ez-toc-section\" id=\"3-introduction-to-sj-gauges-comprehensive-instrument-calibration-process-before-and-after-delivery\"><\/span>3. Gi\u1edbi thi\u1ec7u v\u1ec1 quy tr\u00ecnh hi\u1ec7u chu\u1ea9n thi\u1ebft b\u1ecb to\u00e0n di\u1ec7n c\u1ee7a SJ Gauge tr\u01b0\u1edbc v\u00e0 sau khi giao h\u00e0ng.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-calibration-process-at-sj-gauge\">Quy tr\u00ecnh hi\u1ec7u chu\u1ea9n t\u1ea1i SJ Gauge:<\/h3>\n\n\n\n<p>Ch\u00fang t\u00f4i trang b\u1ecb c\u00e1c thi\u1ebft b\u1ecb sau \u0111\u00e2y cho qu\u00e1 tr\u00ecnh hi\u1ec7u chu\u1ea9n:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M\u00f4i tr\u01b0\u1eddng th\u1eed nghi\u1ec7m \u0111\u00e1p \u1ee9ng nhi\u1ec7t \u0111\u1ed9 tham chi\u1ebfu 20\u2103.<\/li>\n\n\n\n<li>B\u01a1m tay c\u00f3 c\u00e1c d\u1ea3i \u00e1p su\u1ea5t kh\u00e1c nhau.<\/li>\n\n\n\n<li>Th\u01b0\u1edbc \u0111o chu\u1ea9n hi\u1ec7u chu\u1ea9n.<\/li>\n\n\n\n<li>C\u00e1c b\u1ed9 chuy\u1ec3n \u0111\u1ed5i k\u1ebft n\u1ed1i quy tr\u00ecnh (ren).<\/li>\n\n\n\n<li>C\u1ea7n hi\u1ec7u chu\u1ea9n \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t.<\/li>\n<\/ul>\n\n\n\n<p>Sau khi t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i, ch\u00fang ta t\u1eeb t\u1eeb \u00e1p d\u1ee5ng \u00e1p su\u1ea5t b\u1eb1ng b\u01a1m \u00e1p su\u1ea5t. N\u1ebfu \u0111\u1ed3ng h\u1ed3 c\u1ea7n hi\u1ec7u chu\u1ea9n c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, c\u1ea3 \u0111\u1ed3ng h\u1ed3 chu\u1ea9n hi\u1ec7u chu\u1ea9n v\u00e0 \u0111\u1ed3ng h\u1ed3 c\u1ea7n hi\u1ec7u chu\u1ea9n s\u1ebd hi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb gi\u1ed1ng h\u1ec7t nhau.<\/p>\n\n\n\n<p>S\u1ed1 l\u01b0\u1ee3ng \u0111i\u1ec3m ki\u1ec3m tra \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho vi\u1ec7c hi\u1ec7u chu\u1ea9n \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t, d\u1ef1a tr\u00ean ti\u00eau chu\u1ea9n BS EN 837-1 c\u1ee7a Vi\u1ec7n Ti\u00eau chu\u1ea9n Anh (British Standards Institution), \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n\n\n<figure class=\"wp-block-flexible-table-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td colspan=\"2\">C\u00e1c \u0111i\u1ec3m ki\u1ec3m tra \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho vi\u1ec7c hi\u1ec7u chu\u1ea9n \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t \u1edf c\u00e1c l\u1edbp ch\u00ednh x\u00e1c kh\u00e1c nhau<\/td><\/tr><tr><td>\u0110\u1ed9 ch\u00ednh x\u00e1c<br>(\u00b1 % F.S.)<\/td><td>C\u00e1c \u0111i\u1ec3m ki\u1ec3m tra \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb<\/td><\/tr><tr><td>\u00b10,11 TP3T<\/td><td>10<\/td><\/tr><tr><td>\u00b10,251 TP3T<\/td><td>10<\/td><\/tr><tr><td>\u00b10,51 TP3T<\/td><td>10<\/td><\/tr><tr><td>\u00b11.0%<\/td><td>5<\/td><\/tr><tr><td>\u00b11,61 TP3T<\/td><td>5<\/td><\/tr><tr><td>\u00b14,01 TP3T<\/td><td>3<\/td><\/tr><tr><td colspan=\"2\">*M\u1ed7i \u0111i\u1ec3m ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u1edbi \u00e1p su\u1ea5t t\u0103ng v\u00e0 gi\u1ea3m.<br>*Gi\u00e1 tr\u1ecb thang \u0111o t\u1ed1i \u0111a l\u00e0 \u0111i\u1ec3m ki\u1ec3m tra.<br>*Zero l\u00e0 \u0111i\u1ec3m ki\u1ec3m tra khi n\u00f3 \u1edf tr\u1ea1ng th\u00e1i t\u1ef1 do.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>N\u1ebfu c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u1ea7n hi\u1ec7u chu\u1ea9n nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1ea3i \u0111o: 0 \u2026 100 bar<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: \u00b11.0% F.S.<\/li>\n\n\n\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c: A<\/li>\n<\/ul>\n\n\n\n<p>Sau \u0111\u00f3, vi\u1ec7c ki\u1ec3m tra v\u00e0 so s\u00e1nh n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i n\u0103m \u0111i\u1ec3m ki\u1ec3m tra kh\u00e1c nhau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0 bar (*\u0110i\u1ec3m 0 ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra khi kim kh\u00f4ng b\u1ecb c\u1ea3n tr\u1edf)<\/li>\n\n\n\n<li>20 bar<\/li>\n\n\n\n<li>40 bar<\/li>\n\n\n\n<li>60 bar<\/li>\n\n\n\n<li>80 bar<\/li>\n\n\n\n<li>100 bar<\/li>\n<\/ul>\n\n\n\n<p>N\u1ebfu \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t sau khi hi\u1ec7u chu\u1ea9n v\u1eabn th\u1ea5p h\u01a1n \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ed3ng h\u1ed3 cam k\u1ebft ban \u0111\u1ea7u, n\u00ean li\u00ean h\u1ec7 v\u1edbi nh\u00e0 s\u1ea3n xu\u1ea5t ho\u1eb7c xem x\u00e9t vi\u1ec7c thay th\u1ebf tr\u1ef1c ti\u1ebfp.<\/p>\n\n\n\n<p>L\u1ee3i \u00edch khi l\u1ef1a ch\u1ecdn SJ Gauge l\u00e0m nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t c\u1ee7a b\u1ea1n:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m cao v\u00e0 \u1ed5n \u0111\u1ecbnh<\/li>\n\n\n\n<li>Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n v\u00e0 quy \u0111\u1ecbnh c\u1ee7a ng\u00e0nh.<\/li>\n\n\n\n<li>T\u1ed1i \u01b0u h\u00f3a quy tr\u00ecnh v\u00e0 n\u00e2ng cao n\u0103ng su\u1ea5t<\/li>\n\n\n\n<li>Ph\u00f2ng ng\u1eeba th\u1eddi gian ng\u1eebng s\u1ea3n xu\u1ea5t kh\u00f4ng mong mu\u1ed1n<\/li>\n\n\n\n<li>Hi\u1ec7u qu\u1ea3 chi ph\u00ed cao<\/li>\n\n\n\n<li>Ch\u1ea5t l\u01b0\u1ee3ng so v\u1edbi hi\u1ec7u qu\u1ea3 chi ph\u00ed<\/li>\n<\/ul>\n\n\n\n<p>V\u1edbi g\u1ea7n ba th\u1eadp k\u1ef7 kinh nghi\u1ec7m chuy\u00ean m\u00f4n trong l\u0129nh v\u1ef1c \u0111o l\u01b0\u1eddng, B\u1ed9 ph\u1eadn Nghi\u00ean c\u1ee9u K\u1ef9 thu\u1eadt c\u1ee7a SJ Gauge cam k\u1ebft cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p \u0111o l\u01b0\u1eddng t\u00f9y ch\u1ec9nh \u0111\u1ed9c quy\u1ec1n. D\u00f9 l\u00e0 vi\u1ec7c l\u1ef1a ch\u1ecdn th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t, l\u1eafp r\u00e1p linh ki\u1ec7n, hi\u1ec7u chu\u1ea9n hay b\u1ea3o tr\u00ec \u0111\u1ecbnh k\u1ef3, ch\u00fang t\u00f4i lu\u00f4n n\u1ed7 l\u1ef1c mang \u0111\u1ebfn s\u1ea3n ph\u1ea9m ch\u1ea5t l\u01b0\u1ee3ng cao v\u00e0 d\u1ecbch v\u1ee5 h\u1ed7 tr\u1ee3 t\u1eadn t\u00e2m.<\/p>\n\n\n\n<p>Nh\u1ea5p v\u00e0o \u0111\u00e2y \u0111\u1ec3 li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i v\u00e0 \u0111\u1ec3 SJ Gauge cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p \u0111o l\u01b0\u1eddng t\u00f9y ch\u1ec9nh t\u1ed1t nh\u1ea5t cho \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p c\u1ee7a b\u1ea1n.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p v\u00e0 qu\u00e1 tr\u00ecnh ra quy\u1ebft \u0111\u1ecbnh! \u0110\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t kh\u00f4ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn sai s\u00f3t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p ho\u1eb7c c\u00e1c quy\u1ebft \u0111\u1ecbnh li\u00ean quan \u0111\u1ebfn gi\u1edbi h\u1ea1n ph\u1ea1m vi \u00e1p su\u1ea5t, c\u00f3 th\u1ec3 g\u00e2y ra h\u1eadu qu\u1ea3 nghi\u00eam tr\u1ecdng. D\u00f9 quy tr\u00ecnh \u0111o l\u01b0\u1eddng c\u00f3 ch\u00ednh x\u00e1c \u0111\u1ebfn \u0111\u00e2u hay ng\u01b0\u1eddi v\u1eadn h\u00e0nh c\u00f3 c\u1ea9n th\u1eadn \u0111\u1ebfn m\u1ee9c n\u00e0o, n\u1ebfu \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t [\u2026]<\/p>","protected":false},"author":2,"featured_media":2689,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[71],"class_list":["post-2686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-pressure"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Accuracy Class and Allowable Error of Analog Pressure Gauges, and How to Calibrate a Pressure Gauge<\/title>\n<meta name=\"description\" content=\"Learn the accuracy classes and allowable errors of analog pressure gauges, and explore proper calibration methods to ensure precise measurement, reliability, and optimal performance in industrial applications.\" \/>\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.sj-gauge.com\/vi\/pressure-gauge-accuracy\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Accuracy Grade and Tolerance Error of Dial Pressure Gauges\" \/>\n<meta property=\"og:description\" content=\"Learn the accuracy classes and allowable errors of analog pressure gauges, and explore proper calibration methods to ensure precise measurement, reliability, and optimal performance in industrial applications.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-accuracy\/\" \/>\n<meta property=\"og:site_name\" content=\"SJ Gauge | Pressure Gauges, Thermometers &amp; Pressure Sensors\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-18T07:28:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-25T14:16:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.sj-gauge.com\/wp-content\/uploads\/2025\/12\/SJ-Gauge-pressure-gauge-accuracy.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"SJ Gauge\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"SJ Gauge\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/\"},\"author\":{\"name\":\"SJ Gauge\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/#\\\/schema\\\/person\\\/cbc9e642e49a53b18b3eb832486bd52c\"},\"headline\":\"The Accuracy Grade and Tolerance Error of Dial Pressure Gauges\",\"datePublished\":\"2022-07-18T07:28:56+00:00\",\"dateModified\":\"2026-04-25T14:16:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/\"},\"wordCount\":1550,\"publisher\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.sj-gauge.com\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/SJ-Gauge-pressure-gauge-accuracy.jpg\",\"keywords\":[\"Pressure\"],\"articleSection\":[\"Knowledge\"],\"inLanguage\":\"vi\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/\",\"url\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/\",\"name\":\"Accuracy Class and Allowable Error of Analog Pressure Gauges, and How to Calibrate a Pressure Gauge\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.sj-gauge.com\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/SJ-Gauge-pressure-gauge-accuracy.jpg\",\"datePublished\":\"2022-07-18T07:28:56+00:00\",\"dateModified\":\"2026-04-25T14:16:42+00:00\",\"description\":\"Learn the accuracy classes and allowable errors of analog pressure gauges, and explore proper calibration methods to ensure precise measurement, reliability, and optimal performance in industrial applications.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#breadcrumb\"},\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.sj-gauge.com\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/SJ-Gauge-pressure-gauge-accuracy.jpg\",\"contentUrl\":\"https:\\\/\\\/www.sj-gauge.com\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/SJ-Gauge-pressure-gauge-accuracy.jpg\",\"width\":800,\"height\":500},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/pressure-gauge-accuracy\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.sj-gauge.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"The Accuracy Grade and Tolerance Error of Dial Pressure Gauges\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.sj-gauge.com\\\/#website\",\"url\":\"https:\\\/\\\/www.sj-gauge.com\\\/\",\"name\":\"SJ Gauge | Pressure Gauges, Thermometers &amp; 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