{"id":4223,"date":"2024-04-13T23:36:00","date_gmt":"2024-04-13T15:36:00","guid":{"rendered":"https:\/\/www.sj-gauge.com\/?p=4223"},"modified":"2026-04-20T20:25:55","modified_gmt":"2026-04-20T12:25:55","slug":"pressure-gauge-vacuum-issues","status":"publish","type":"post","link":"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/","title":{"rendered":"T\u1ea1i sao \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c -760 mmHg? \u0110\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t \u0111o ch\u00e2n kh\u00f4ng nh\u01b0 th\u1ebf n\u00e0o?"},"content":{"rendered":"<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>M\u00e1y \u0111o ch\u00e2n kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o m\u1ee9c \u0111\u1ed9 ch\u00e2n kh\u00f4ng b\u00ean trong m\u1ed9t h\u1ec7 th\u1ed1ng. Th\u00f4ng th\u01b0\u1eddng, \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n \u0111\u01b0\u1ee3c l\u1ea5y l\u00e0m \u0111i\u1ec3m 0 tham chi\u1ebfu, do \u0111\u00f3, d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n ti\u00eau chu\u1ea9n \u1edf m\u1ef1c n\u01b0\u1edbc bi\u1ec3n, gi\u00e1 tr\u1ecb \u0111\u1ecdc t\u1ed1i \u0111a c\u1ee7a m\u00e1y \u0111o ch\u00e2n kh\u00f4ng l\u00e0 kho\u1ea3ng -760 mmHg (ho\u1eb7c -76 cmHg), t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111i\u1ec1u ki\u1ec7n ch\u00e2n kh\u00f4ng g\u1ea7n nh\u01b0 ho\u00e0n h\u1ea3o. Tuy nhi\u00ean, trong th\u1ef1c t\u1ebf s\u1eed d\u1ee5ng, nhi\u1ec1u ng\u01b0\u1eddi nh\u1eadn th\u1ea5y r\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng th\u01b0\u1eddng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn -760 mmHg. \u0110i\u1ec1u n\u00e0y kh\u00f4ng nh\u1ea5t thi\u1ebft c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ed3ng h\u1ed3 b\u1ecb h\u1ecfng. Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, n\u00f3 c\u00f3 th\u1ec3 li\u00ean quan \u0111\u1ebfn t\u00ecnh tr\u1ea1ng c\u1ee7a thi\u1ebft b\u1ecb, vi\u1ec7c l\u1eafp \u0111\u1eb7t ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u00fd do ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/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-vacuum-issues\/#1-the-vacuum-gauge-itself-is-faulty\" >1. Ch\u00ednh \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng b\u1ecb h\u1ecfng<\/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-vacuum-issues\/#2-the-piping-or-fittings-are-not-completely-sealed\" >2. H\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn ho\u1eb7c c\u00e1c ph\u1ee5 ki\u1ec7n kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ecbt k\u00edn ho\u00e0n to\u00e0n<\/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-vacuum-issues\/#3-the-vacuum-pump-or-vacuum-motor-has-performance-limitations\" >3. M\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng ho\u1eb7c \u0111\u1ed9ng c\u01a1 ch\u00e2n kh\u00f4ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf v\u1ec1 hi\u1ec7u su\u1ea5t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/#4-the-pressure-inside-the-gauge-case-is-not-balanced-with-ambient-pressure\" >4. \u00c1p su\u1ea5t b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3 kh\u00f4ng c\u00e2n b\u1eb1ng v\u1edbi \u00e1p su\u1ea5t m\u00f4i tr\u01b0\u1eddng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/#5-the-effect-of-atmospheric-pressure-and-altitude\" >5. \u1ea2nh h\u01b0\u1edfng c\u1ee7a \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n v\u00e0 \u0111\u1ed9 cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/#conclusion\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-36f2f2ff83901a7e1dd62cd567f955f8\" id=\"h-1-the-vacuum-gauge-itself-is-faulty\"><span class=\"ez-toc-section\" id=\"1-the-vacuum-gauge-itself-is-faulty\"><\/span>1. Ch\u00ednh \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng b\u1ecb h\u1ecfng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u00e1y \u0111o ch\u00e2n kh\u00f4ng l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ea1y c\u1ea3m v\u00e0 kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c va \u0111\u1eadp. N\u1ebfu b\u1ecb va ch\u1ea1m ho\u1eb7c r\u01a1i r\u1edbt trong qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n, l\u1eafp \u0111\u1eb7t ho\u1eb7c s\u1eed d\u1ee5ng, c\u00f3 th\u1ec3 x\u1ea3y ra c\u00e1c s\u1ef1 c\u1ed1 nh\u01b0 kh\u00f4ng tr\u1edf v\u1ec1 m\u1ee9c 0, ch\u1ec9 s\u1ed1 kh\u00f4ng ch\u00ednh x\u00e1c ho\u1eb7c sai l\u1ec7ch k\u1ebft qu\u1ea3 \u0111o. V\u00ec l\u00fd do n\u00e0y, m\u1ed7i \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra tr\u01b0\u1edbc khi v\u1eadn chuy\u1ec3n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. \u0110\u1ed3ng h\u1ed3 c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 c\u1ea9n th\u1eadn trong qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n v\u00e0 l\u1eafp \u0111\u1eb7t \u0111\u1ec3 tr\u00e1nh h\u01b0 h\u1ecfng do va ch\u1ea1m. N\u1ebfu ch\u00ednh \u0111\u1ed3ng h\u1ed3 b\u1ecb h\u01b0 h\u1ecfng, n\u00f3 c\u00f3 th\u1ec3 kh\u00f4ng hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb \u0111o ch\u00ednh x\u00e1c ngay c\u1ea3 khi m\u1ee9c ch\u00e2n kh\u00f4ng c\u1ee7a h\u1ec7 th\u1ed1ng \u1edf tr\u1ea1ng th\u00e1i b\u00ecnh th\u01b0\u1eddng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-72f66da7a7e89bf3d305b60db3740c47\" id=\"h-2-the-piping-or-fittings-are-not-completely-sealed\"><span class=\"ez-toc-section\" id=\"2-the-piping-or-fittings-are-not-completely-sealed\"><\/span>2. H\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn ho\u1eb7c c\u00e1c ph\u1ee5 ki\u1ec7n kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ecbt k\u00edn ho\u00e0n to\u00e0n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Vi\u1ec7c \u0111o ch\u00e2n kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn b\u1edfi \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n. Ngay c\u1ea3 khi h\u1ec7 th\u1ed1ng ch\u00e2n kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t l\u1ed7 r\u00f2 r\u1ec9 r\u1ea5t nh\u1ecf khi\u1ebfn kh\u00f4ng kh\u00ed l\u1ecdt v\u00e0o \u0111\u01b0\u1eddng \u1ed1ng, h\u1ec7 th\u1ed1ng c\u0169ng s\u1ebd kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee9c ch\u00e2n kh\u00f4ng mong mu\u1ed1n. Do \u0111\u00f3, n\u1ebfu b\u1ea1n mu\u1ed1n \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng \u0111\u1ea1t g\u1ea7n m\u1ee9c ch\u00e2n kh\u00f4ng t\u1ed1i \u0111a, b\u1ea1n ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng to\u00e0n b\u1ed9 quy tr\u00ecnh, t\u1eeb m\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng v\u00e0 \u0111\u01b0\u1eddng \u1ed1ng \u0111\u1ebfn c\u00e1c ph\u1ee5 ki\u1ec7n v\u00e0 ch\u00ednh \u0111\u1ed3ng h\u1ed3 \u0111o, \u0111\u1ec1u \u0111\u01b0\u1ee3c b\u1ecbt k\u00edn ho\u00e0n to\u00e0n. Ngay c\u1ea3 m\u1ed9t l\u1ed7 r\u00f2 r\u1ec9 nh\u1ecf t\u1ea1i m\u1ed9t \u0111i\u1ec3m k\u1ebft n\u1ed1i c\u0169ng c\u00f3 th\u1ec3 ng\u0103n \u0111\u1ed3ng h\u1ed3 \u0111o \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c -760 mmHg.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-8ae3487328c853785c3237935cbb4304\" id=\"h-3-the-vacuum-pump-or-vacuum-motor-has-performance-limitations\"><span class=\"ez-toc-section\" id=\"3-the-vacuum-pump-or-vacuum-motor-has-performance-limitations\"><\/span>3. M\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng ho\u1eb7c \u0111\u1ed9ng c\u01a1 ch\u00e2n kh\u00f4ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf v\u1ec1 hi\u1ec7u su\u1ea5t<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t s\u1ed1 m\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ec9 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u1ea1ng th\u00e1i g\u1ea7n ch\u00e2n kh\u00f4ng thay v\u00ec ch\u00e2n kh\u00f4ng ho\u00e0n to\u00e0n theo l\u00fd thuy\u1ebft. Ngo\u00e0i ra, n\u1ebfu m\u00e1y b\u01a1m \u0111\u00e3 c\u0169, b\u1ecb m\u00f2n ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o d\u01b0\u1ee1ng \u0111\u00fang c\u00e1ch, hi\u1ec7u su\u1ea5t ch\u00e2n kh\u00f4ng c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 gi\u1ea3m d\u1ea7n theo th\u1eddi gian. N\u00f3i c\u00e1ch kh\u00e1c, ngay c\u1ea3 khi \u0111\u1ed3ng h\u1ed3 \u0111o ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng v\u00e0 h\u1ec7 th\u1ed1ng kh\u00f4ng b\u1ecb r\u00f2 r\u1ec9, m\u1ee9c ch\u00e2n kh\u00f4ng v\u1eabn c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb l\u00fd t\u01b0\u1edfng n\u1ebfu ch\u00ednh m\u00e1y b\u01a1m kh\u00f4ng th\u1ec3 ho\u1ea1t \u0111\u1ed9ng h\u1ebft c\u00f4ng 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-67b4bc342eac86e3222a57f36076ca41\" id=\"h-4-the-pressure-inside-the-gauge-case-is-not-balanced-with-ambient-pressure\"><span class=\"ez-toc-section\" id=\"4-the-pressure-inside-the-gauge-case-is-not-balanced-with-ambient-pressure\"><\/span>4. \u00c1p su\u1ea5t b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3 kh\u00f4ng c\u00e2n b\u1eb1ng v\u1edbi \u00e1p su\u1ea5t m\u00f4i tr\u01b0\u1eddng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1ea5n \u0111\u1ec1 n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng ng\u0103n c\u1ea3n \u0111\u1ed3ng h\u1ed3 \u0111o \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c -760 mmHg, nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c k\u1ebft qu\u1ea3 \u0111o kh\u00f4ng ch\u00ednh x\u00e1c. N\u1ebfu b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3 \u0111\u01b0\u1ee3c b\u1ecbt k\u00edn v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 th\u00f4ng gi\u00f3 v\u1edbi m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i, \u00e1p su\u1ea5t b\u00ean trong v\u1ecf c\u00f3 th\u1ec3 kh\u00e1c v\u1edbi \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n xung quanh, d\u1eabn \u0111\u1ebfn \u0111i\u1ec3m 0 c\u1ee7a ph\u00e9p \u0111o b\u1ecb l\u1ec7ch. Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, n\u1ebfu nhi\u1ec7t \u0111\u1ed9 b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3 t\u0103ng l\u00ean v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 trao \u0111\u1ed5i kh\u00f4ng kh\u00ed, \u00e1p su\u1ea5t b\u00ean trong c\u00f3 th\u1ec3 cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi \u00e1p su\u1ea5t b\u00ean ngo\u00e0i, khi\u1ebfn kim ch\u1ec9 th\u1ecb kh\u00f4ng quay v\u1ec1 v\u1ecb tr\u00ed 0 ho\u1eb7c d\u1eabn \u0111\u1ebfn sai s\u1ed1 \u0111o. Trong nh\u1eefng t\u00ecnh hu\u1ed1ng n\u00e0y, gi\u1ea3i ph\u00e1p th\u01b0\u1eddng r\u1ea5t \u0111\u01a1n gi\u1ea3n: m\u1edf n\u1eafp n\u1ea1p ho\u1eb7c l\u1ed7 th\u00f4ng h\u01a1i \u0111\u1ec3 \u00e1p su\u1ea5t b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3 c\u00e2n b\u1eb1ng v\u1edbi \u00e1p su\u1ea5t m\u00f4i tr\u01b0\u1eddng xung quanh, gi\u00fap \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-88c9970c20c2b36711b9e6bd3b49b200\" id=\"h-5-the-effect-of-atmospheric-pressure-and-altitude\"><span class=\"ez-toc-section\" id=\"5-the-effect-of-atmospheric-pressure-and-altitude\"><\/span>5. \u1ea2nh h\u01b0\u1edfng c\u1ee7a \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n v\u00e0 \u0111\u1ed9 cao<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Nhi\u1ec1u ng\u01b0\u1eddi cho r\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng ph\u1ea3i hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb -760 mmHg m\u1edbi \u0111\u01b0\u1ee3c coi l\u00e0 b\u00ecnh th\u01b0\u1eddng, nh\u01b0ng th\u1ef1c t\u1ebf con s\u1ed1 n\u00e0y d\u1ef1a tr\u00ean \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n chu\u1ea9n \u1edf m\u1ef1c n\u01b0\u1edbc bi\u1ec3n. \u00c1p su\u1ea5t kh\u00ed quy\u1ec3n ti\u00eau chu\u1ea9n \u0111\u1ec1 c\u1eadp \u0111\u1ebfn \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u01b0\u1ee3c \u0111o t\u1ea1i m\u1ef1c n\u01b0\u1edbc bi\u1ec3n, kho\u1ea3ng 760 mmHg. Tuy nhi\u00ean, v\u00ec \u0111i\u1ec3m 0 c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng d\u1ef1a tr\u00ean \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n xung quanh, n\u00f3 s\u1ebd thay \u0111\u1ed5i t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ed9 cao c\u1ee7a v\u1ecb tr\u00ed \u0111o. V\u00ed d\u1ee5, \u1edf \u0111\u1ed9 cao kho\u1ea3ng 240 m\u00e9t, \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng c\u00f3 th\u1ec3 ch\u1ec9 kho\u1ea3ng 740 mmHg. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, ngay c\u1ea3 khi b\u00ean trong \u0111\u01b0\u1eddng \u1ed1ng \u0111\u00e3 \u0111\u1ea1t \u0111\u1ebfn tr\u1ea1ng th\u00e1i ch\u00e2n kh\u00f4ng g\u1ea7n nh\u01b0 ho\u00e0n to\u00e0n, \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng c\u00f3 th\u1ec3 ch\u1ec9 hi\u1ec3n th\u1ecb -740 mmHg thay v\u00ec -760 mmHg. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u1ec9 s\u1ed1 \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng d\u01b0\u1edbi -760 mmHg kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 c\u1ed1 thi\u1ebft b\u1ecb; n\u00f3 c\u00f3 th\u1ec3 ch\u1ec9 ph\u1ea3n \u00e1nh t\u00e1c \u0111\u1ed9ng t\u1ef1 nhi\u00ean c\u1ee7a \u0111i\u1ec1u ki\u1ec7n kh\u00ed quy\u1ec3n \u0111\u1ecba ph\u01b0\u01a1ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-palette-color-2-color has-text-color has-link-color wp-elements-6421794a017bba9c18be30b5cea78077\" id=\"h-conclusion\"><span class=\"ez-toc-section\" id=\"conclusion\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Nh\u00ecn chung, \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng nh\u1ea1y c\u1ea3m, c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1 b\u00ean ngo\u00e0i, bao g\u1ed3m t\u00ecnh tr\u1ea1ng c\u1ee7a ch\u00ednh \u0111\u1ed3ng h\u1ed3, kh\u1ea3 n\u0103ng k\u00edn kh\u00ed c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng \u1ed1ng, c\u00f4ng su\u1ea5t c\u1ee7a m\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng, s\u1ef1 c\u00e2n b\u1eb1ng \u00e1p su\u1ea5t b\u00ean trong v\u1ecf \u0111\u1ed3ng h\u1ed3, v\u00e0 nh\u1eefng thay \u0111\u1ed5i v\u1ec1 \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n do \u0111\u1ed9 cao g\u00e2y ra. Do \u0111\u00f3, khi \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c -760 mmHg, kh\u00f4ng n\u00ean t\u1ef1 \u0111\u1ed9ng k\u1ebft lu\u1eadn r\u1eb1ng \u0111\u1ed3ng h\u1ed3 b\u1ecb h\u1ecfng. Thay v\u00ec li\u00ean t\u1ee5c thay th\u1ebf \u0111\u1ed3ng h\u1ed3, t\u1ed1t h\u01a1n h\u1ebft l\u00e0 n\u00ean ki\u1ec3m tra c\u00e1c nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 n\u00eau tr\u00ean tr\u01b0\u1edbc ti\u00ean \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u1ea5n \u0111\u1ec1 th\u1ef1c s\u1ef1 v\u00e0 tr\u00e1nh t\u1ed1n th\u1eddi gian v\u00e0 chi ph\u00ed kh\u00f4ng c\u1ea7n thi\u1ebft.<br><\/p>","protected":false},"excerpt":{"rendered":"<p>A vacuum gauge is used to measure the vacuum level inside a system. In general, atmospheric pressure is taken as the reference zero point, so under standard atmospheric pressure at sea level, the maximum reading of a vacuum gauge is about -760 mmHg (or -76 cmHg), which represents a near-perfect vacuum condition. However, in actual [&hellip;]<\/p>","protected":false},"author":2,"featured_media":4309,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[71],"class_list":["post-4223","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>Why Can\u2019t a Vacuum Gauge Reach -760 mmHg? 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Nguy\u00ean nh\u00e2n v\u00e0 gi\u1ea3i ph\u00e1p\uff5cSJ Gauge","description":"Trong \u0111i\u1ec1u ki\u1ec7n l\u00fd t\u01b0\u1edfng, \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng n\u00ean \u0111\u1ea1t m\u1ee9c -760 mmHg, nh\u01b0ng trong th\u1ef1c t\u1ebf, gi\u00e1 tr\u1ecb n\u00e0y th\u01b0\u1eddng kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c. H\u00e3y t\u00ecm hi\u1ec3u c\u00e1c nguy\u00ean nh\u00e2n g\u00e2y ra t\u00ecnh tr\u1ea1ng n\u00e0y, ch\u1eb3ng h\u1ea1n nh\u01b0 r\u00f2 r\u1ec9, \u0111\u1ed3ng h\u1ed3 \u0111o b\u1ecb h\u1ecfng v\u00e0 c\u00e1c h\u1ea1n ch\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng, c\u0169ng nh\u01b0 c\u00e1ch c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t ch\u00e2n kh\u00f4ng.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/","og_locale":"vi_VN","og_type":"article","og_title":"Why Can`t a Vacuum Gauge Reach -760 mmHg? How Does a Pressure Gauge Measure Vacuum?","og_description":"A vacuum gauge should reach -760 mmHg under ideal conditions, but in real applications, it often falls short. 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