{"id":8201,"date":"2026-05-20T15:42:42","date_gmt":"2026-05-20T15:42:42","guid":{"rendered":"https:\/\/www.yunrui-controls.com\/?p=8201"},"modified":"2026-05-20T16:49:49","modified_gmt":"2026-05-20T16:49:49","slug":"understanding-gauge-and-absolute-pressure","status":"publish","type":"post","link":"https:\/\/www.yunrui-controls.com\/vi\/understanding-gauge-and-absolute-pressure\/","title":{"rendered":"Hi\u1ec3u v\u1ec1 \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i: H\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n"},"content":{"rendered":"

Trong s\u1ea3n xu\u1ea5t c\u00f4ng nghi\u1ec7p, \u0111i\u1ec1u khi\u1ec3n quy tr\u00ecnh v\u00e0 b\u1ea3o tr\u00ec thi\u1ebft b\u1ecb, \u0111o \u00e1p su\u1ea5t l\u00e0 m\u1ed9t trong nh\u1eefng bi\u1ebfn s\u1ed1 c\u01a1 b\u1ea3n nh\u01b0ng quan tr\u1ecdng nh\u1ea5t. Tuy nhi\u00ean, c\u00e1c k\u1ef9 s\u01b0 v\u00e0 k\u1ef9 thu\u1eadt vi\u00ean quy tr\u00ecnh th\u01b0\u1eddng hi\u1ec3u sai c\u00e1c ch\u1ec9 s\u1ed1 \u00e1p su\u1ea5t trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh th\u1eed nghi\u1ec7m ho\u1eb7c t\u00ednh to\u00e1n d\u1eef li\u1ec7u. Nh\u1ea7m l\u1eabn gi\u1eefa \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i (Gauge Pressure) v\u00e0 \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i (Absolute Pressure) th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn sai s\u00f3t trong \u0111o l\u01b0u l\u01b0\u1ee3ng, v\u1eadn h\u00e0nh van kh\u00f4ng ch\u00ednh x\u00e1c v\u00e0 ti\u1ec1m \u1ea9n r\u1ee7i ro an to\u00e0n. H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd ph\u00e2n t\u00edch chi ti\u1ebft s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i, c\u00f4ng th\u1ee9c v\u00e0 h\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c sai l\u1ec7ch trong \u0111o \u00e1p su\u1ea5t t\u1ea1i ch\u1ed7.<\/p>\n

01 C\u00e1c \u0111\u1ecbnh ngh\u0129a c\u1ed1t l\u00f5i: \u00c1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i so v\u1edbi \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i<\/h2>\n

S\u1ef1 kh\u00e1c bi\u1ec7t c\u01a1 b\u1ea3n gi\u1eefa \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i n\u1eb1m ho\u00e0n to\u00e0n \u1edf vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111i\u1ec3m tham chi\u1ebfu b\u1eb1ng kh\u00f4ng.<\/p>\n\n\n\n\n\n\n\n
Lo\u1ea1i \u00e1p su\u1ea5t<\/strong><\/td>\nH\u1eadu t\u1ed1 th\u00f4ng d\u1ee5ng<\/strong><\/td>\n\u0110i\u1ec3m tham chi\u1ebfu s\u1ed1 kh\u00f4ng<\/strong><\/td>\n\u0110\u1ecdc s\u00e1ch ngo\u00e0i tr\u1eddi<\/strong><\/td>\n\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\n<\/tr>\n<\/thead>\n
\u00c1p su\u1ea5t \u0111o<\/span><\/td>\nG, barg, psig<\/span><\/td>\n\u00c1p su\u1ea5t kh\u00ed quy\u1ec3n \u0111\u1ecba ph\u01b0\u01a1ng<\/span><\/td>\n0<\/span><\/td>\nM\u1ee9c n\u01b0\u1edbc trong b\u1ec3 h\u1edf, \u0111\u01b0\u1eddng \u1ed1ng ti\u00eau chu\u1ea9n c\u1ee7a nh\u00e0 m\u00e1y<\/span><\/td>\n<\/tr>\n
\u00c1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i<\/span><\/td>\nA, bara, psia<\/span><\/td>\nCh\u00e2n kh\u00f4ng tuy\u1ec7t \u0111\u1ed1i (Kh\u00f4ng \u0111\u1ed9 tuy\u1ec7t \u0111\u1ed1i)<\/span><\/td>\n\u2248 101,3 kPa (14,7 psi)<\/span><\/td>\nM\u1eadt \u0111\u1ed9 kh\u00ed, h\u1ec7 th\u1ed1ng ch\u00e2n kh\u00f4ng, h\u01a1i n\u01b0\u1edbc<\/span><\/td>\n<\/tr>\n
\u0110\u1ed3ng h\u1ed3 \u0111o k\u00edn<\/span><\/td>\nS, bargS<\/span><\/td>\nB\u1ed9 tham chi\u1ebfu \u0111\u01b0\u1ee3c ni\u00eam phong b\u00ean trong b\u1ed9 ph\u00e1t.<\/span><\/td>\nT\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ecba \u0111i\u1ec3m s\u1ea3n xu\u1ea5t.<\/span><\/td>\nM\u00f4i tr\u01b0\u1eddng nh\u1edbt, m\u00e1y r\u1eeda \u00e1p l\u1ef1c cao<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n
  • \n

    \u00c1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i (G): \u00c1p su\u1ea5t n\u00e0y \u0111\u01b0\u1ee3c \u0111o so v\u1edbi \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng. N\u00f3 ho\u00e0n to\u00e0n b\u1ecf qua \u00e1p su\u1ea5t do kh\u00ed quy\u1ec3n xung quanh g\u00e2y ra, coi m\u00f4i tr\u01b0\u1eddng hi\u1ec7n t\u1ea1i l\u00e0 \u0111i\u1ec3m xu\u1ea5t ph\u00e1t b\u1eb1ng kh\u00f4ng.<\/p>\n<\/li>\n

  • \n

    \u00c1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i (A): \u00c1p su\u1ea5t n\u00e0y \u0111\u01b0\u1ee3c \u0111o t\u1eeb tr\u1ea1ng th\u00e1i ch\u00e2n kh\u00f4ng tuy\u1ec7t \u0111\u1ed1i (tr\u1ea1ng th\u00e1i ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 ph\u00e2n t\u1eed kh\u00f4ng kh\u00ed ho\u1eb7c chuy\u1ec3n \u0111\u1ed9ng ph\u00e2n t\u1eed). N\u00f3 kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi \u0111i\u1ec1u ki\u1ec7n th\u1eddi ti\u1ebft ho\u1eb7c thay \u0111\u1ed5i \u0111\u1ed9 cao, th\u1ec3 hi\u1ec7n \u00e1p su\u1ea5t v\u1eadt l\u00fd th\u1ef1c s\u1ef1 t\u00e1c \u0111\u1ed9ng l\u00ean m\u1ed9t b\u1ec1 m\u1eb7t.<\/p>\n<\/li>\n<\/ul>\n

    02 M\u1ed1i quan h\u1ec7 to\u00e1n h\u1ecdc v\u00e0 chuy\u1ec3n \u0111\u1ed5i<\/h2>\n

    Hi\u1ec3u \u0111\u01b0\u1ee3c m\u1ed1i quan h\u1ec7 to\u00e1n h\u1ecdc gi\u1eefa c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho vi\u1ec7c l\u1eadp tr\u00ecnh DCS\/PLC v\u00e0 c\u00e1c t\u00ednh to\u00e1n k\u1ef9 thu\u1eadt:<\/p>\n

    \u00c1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i = \u00c1p su\u1ea5t d\u01b0 + \u00c1p su\u1ea5t kh\u00ed quy\u1ec3n t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng<\/p>\n

    Ho\u1eb7c \u0111\u01b0\u1ee3c di\u1ec5n \u0111\u1ea1t nh\u01b0 sau: Pabs = Pgauge + Patm<\/p>\n

    M\u1ed9t l\u1ed7i th\u01b0\u1eddng g\u1eb7p \u1edf c\u00e1c k\u1ef9 s\u01b0 m\u1edbi v\u00e0o ngh\u1ec1 l\u00e0 s\u1eed d\u1ee5ng 101,325 kPa (1 atm) l\u00e0m h\u1eb1ng s\u1ed1 c\u1ed1 \u0111\u1ecbnh cho \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n xung quanh trong t\u1ea5t c\u1ea3 c\u00e1c ph\u00e9p t\u00ednh. Trong m\u00f4i tr\u01b0\u1eddng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao, c\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y s\u1ebd g\u00e2y ra sai s\u1ed1 nghi\u00eam tr\u1ecdng v\u00ec \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n l\u00e0 m\u1ed9t bi\u1ebfn s\u1ed1 \u0111\u1ed9ng:<\/p>\n

      \n
    • \n

      \u1ea2nh h\u01b0\u1edfng c\u1ee7a \u0111\u1ed9 cao: \u00c1p su\u1ea5t kh\u00ed quy\u1ec3n gi\u1ea3m kho\u1ea3ng 12 kPa cho m\u1ed7i 1000 m\u00e9t \u0111\u1ed9 cao t\u0103ng th\u00eam.<\/p>\n<\/li>\n

    • \n

      T\u00e1c \u0111\u1ed9ng c\u1ee7a th\u1eddi ti\u1ebft: H\u1ec7 th\u1ed1ng \u00e1p su\u1ea5t cao mang \u0111\u1ebfn b\u1ea7u tr\u1eddi quang \u0111\u00e3ng, trong khi h\u1ec7 th\u1ed1ng \u00e1p su\u1ea5t th\u1ea5p g\u00e2y ra m\u01b0a, l\u00e0m thay \u0111\u1ed5i \u0111\u01b0\u1eddng c\u01a1 s\u1edf c\u1ee5c b\u1ed9.<\/p>\n<\/li>\n

    • \n

      Th\u1ef1c ti\u1ec5n k\u1ef9 thu\u1eadt: \u0110\u1ed1i v\u1edbi vi\u1ec7c chuy\u1ec3n giao quy\u1ec1n s\u1edf h\u1eefu ho\u1eb7c \u0111o l\u01b0\u1eddng kh\u00ed v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao, c\u1ea7n t\u00edch h\u1ee3p b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n v\u00e0o h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng b\u00f9 tr\u1eeb cho nh\u1eefng thay \u0111\u1ed5i c\u1ee7a kh\u00ed quy\u1ec3n.<\/p>\n<\/li>\n<\/ul>\n

      03 \u1ee8ng d\u1ee5ng quan tr\u1ecdng \u0111\u00f2i h\u1ecfi \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i<\/h2>\n

      M\u1eb7c d\u00f9 c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i d\u1ec5 ch\u1ebf t\u1ea1o v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed h\u01a1n, nh\u01b0ng c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i l\u1ea1i l\u00e0 y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt trong m\u1ed9t s\u1ed1 quy tr\u00ecnh chuy\u00ean bi\u1ec7t:<\/p>\n

        \n
      1. \n

        \u0110o l\u01b0u l\u01b0\u1ee3ng kh\u00ed c\u00f4ng nghi\u1ec7p<\/p>\n

        Theo \u0111\u1ecbnh lu\u1eadt kh\u00ed l\u00fd t\u01b0\u1edfng (PV=nRT), th\u1ec3 t\u00edch v\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a m\u1ed9t ch\u1ea5t kh\u00ed t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i c\u1ee7a n\u00f3. N\u1ebfu s\u1eed d\u1ee5ng \u00e1p su\u1ea5t d\u01b0 \u0111\u1ec3 t\u00ednh to\u00e1n l\u01b0u l\u01b0\u1ee3ng ti\u00eau chu\u1ea9n (Nm\u00b3\/h) \u1edf v\u00f9ng n\u00fai cao ho\u1eb7c trong \u0111i\u1ec1u ki\u1ec7n th\u1eddi ti\u1ebft thay \u0111\u1ed5i, sai s\u1ed1 t\u00ednh to\u00e1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng v\u01b0\u1ee3t qu\u00e1 15%.<\/p>\n<\/li>\n

      2. \n

        H\u1ec7 th\u1ed1ng ch\u00e2n kh\u00f4ng c\u00f4ng nghi\u1ec7p<\/p>\n

        Trong qu\u00e1 tr\u00ecnh s\u1ea5y ch\u00e2n kh\u00f4ng d\u01b0\u1ee3c ph\u1ea9m, s\u1ea3n xu\u1ea5t ch\u1ea5t b\u00e1n d\u1eabn ho\u1eb7c c\u00e1c c\u1ed9t ch\u01b0ng c\u1ea5t ch\u00e2n kh\u00f4ng h\u00f3a ch\u1ea5t, \u00e1p su\u1ea5t ho\u1ea1t \u0111\u1ed9ng th\u1ea5p h\u01a1n \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n. Vi\u1ec7c s\u1eed d\u1ee5ng \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i (hi\u1ec3n th\u1ecb d\u01b0\u1edbi d\u1ea1ng \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i \u00e2m ho\u1eb7c ph\u1ea7n tr\u0103m ch\u00e2n kh\u00f4ng) c\u00f3 th\u1ec3 g\u00e2y ra dao \u0111\u1ed9ng trong v\u00f2ng \u0111i\u1ec1u khi\u1ec3n do s\u1ef1 thay \u0111\u1ed5i th\u1eddi ti\u1ebft b\u00ean ngo\u00e0i. C\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u1ea3m b\u1ea3o m\u1ed9t t\u00edn hi\u1ec7u tham chi\u1ebfu \u0111i\u1ec1u khi\u1ec3n ho\u00e0n to\u00e0n \u1ed5n \u0111\u1ecbnh.<\/p>\n<\/li>\n

      3. \n

        Ki\u1ec3m so\u00e1t ch\u1ed1ng t\u0103ng \u00e1p m\u00e1y n\u00e9n<\/p>\n

        \u0110\u01b0\u1eddng gi\u1edbi h\u1ea1n xung \u00e1p c\u1ee7a m\u00e1y n\u00e9n ly t\u00e2m \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng t\u1ef7 l\u1ec7 ch\u00ednh x\u00e1c gi\u1eefa \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u1ea7u v\u00e0o v\u00e0 \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u1ea7u ra. Vi\u1ec7c d\u1ef1a v\u00e0o c\u00e1c gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t \u0111o khi\u1ebfn h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n ch\u1ed1ng xung \u00e1p d\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi s\u1ef1 thay \u0111\u1ed5i kh\u00ed quy\u1ec3n, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ph\u1ea3n \u1ee9ng van ch\u1eadm tr\u1ec5 v\u00e0 h\u01b0 h\u1ecfng c\u01a1 kh\u00ed nghi\u00eam tr\u1ecdng.<\/p>\n<\/li>\n<\/ol>\n

        04 H\u01b0\u1edbng d\u1eabn tham kh\u1ea3o v\u1ec1 c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t c\u00f4ng nghi\u1ec7p<\/h2>\n

        \u0110\u1ed1i v\u1edbi c\u00e1c d\u1ef1 \u00e1n qu\u1ed1c t\u1ebf v\u00e0 t\u00e0i li\u1ec7u mua s\u1eafm to\u00e0n c\u1ea7u, b\u1ea3ng quy \u0111\u1ed5i sau \u0111\u00e2y li\u1ec7t k\u00ea c\u00e1c \u0111\u01a1n v\u1ecb \u00e1p su\u1ea5t ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean to\u00e0n th\u1ebf gi\u1edbi:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
        T\u00ean \u0111\u01a1n v\u1ecb<\/strong><\/td>\nK\u00fd hi\u1ec7u ti\u00eau chu\u1ea9n<\/strong><\/td>\nGi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u0111\u01b0\u01a1ng ch\u00ednh x\u00e1c<\/strong><\/td>\nQuy \u0111\u1ed5i x\u1ea5p x\u1ec9 sang h\u1ec7 \u0111o l\u01b0\u1eddng Anh<\/strong><\/td>\n<\/tr>\n<\/thead>\n
        Megapascal<\/span><\/td>\nMPa<\/span><\/td>\n1 MPa = 10 bar = 1000 kPa<\/span><\/td>\n1 MPa \u2248 145,038 psi<\/span><\/td>\n<\/tr>\n
        Thanh<\/span><\/td>\nthanh<\/span><\/td>\n1 bar = 100 kPa = 0,1 MPa<\/span><\/td>\n1 bar \u2248 14,5038 psi<\/span><\/td>\n<\/tr>\n
        Kilopascal<\/span><\/td>\nkPa<\/span><\/td>\n1 kPa = 1000 Pa = 0,01 bar<\/span><\/td>\n1 kPa \u2248 0,145 psi<\/span><\/td>\n<\/tr>\n
        Kh\u00f4ng kh\u00ed ti\u00eau chu\u1ea9n<\/span><\/td>\nATM<\/span><\/td>\n1 atm = 101,325 kPa<\/span><\/td>\n1 atm = 760 mmHg<\/span><\/td>\n<\/tr>\n
        Milim\u00e9t th\u1ee7y ng\u00e2n<\/span><\/td>\nmmHg<\/span><\/td>\n760 mmHg = 1 atm<\/span><\/td>\n1 mmHg \u2248 133,322 Pa<\/span><\/td>\n<\/tr>\n
        Tr\u1ecdng l\u01b0\u1ee3ng tr\u00ean m\u1ed7i inch vu\u00f4ng<\/span><\/td>\npsi<\/span><\/td>\n1 psi \u2248 6,895 kPa<\/span><\/td>\n14,5038 psi \u2248 1 bar<\/span><\/td>\n<\/tr>\n
        Kilogram l\u1ef1c tr\u00ean cm vu\u00f4ng<\/span><\/td>\nkgf\/cm\u00b2<\/span><\/td>\n1 kgf\/cm2 \u2248 0,098 MPa \u2248 1 bar<\/span><\/td>\nTh\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 1 kg \u00e1p su\u1ea5t<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        05 B\u1ea3o tr\u00ec v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/h2>\n

        \u0110\u1ec3 ng\u0103n ng\u1eeba sai s\u00f3t trong qu\u00e1 tr\u00ecnh mua s\u1eafm v\u00e0 gi\u1ea3m thi\u1ec3u s\u1ef1 sai l\u1ec7ch c\u1ee7a thi\u1ebft b\u1ecb trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh l\u00e2u d\u00e0i, h\u00e3y \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc k\u1ef9 thu\u1eadt sau:<\/p>\n

          \n
        • \n

          Ki\u1ec3m tra nh\u00e3n m\u00e1c: Lu\u00f4n ki\u1ec3m tra h\u1eadu t\u1ed1 m\u00e3 hi\u1ec7u s\u1ea3n ph\u1ea9m tr\u01b0\u1edbc khi x\u00e1c nh\u1eadn \u0111\u01a1n \u0111\u1eb7t h\u00e0ng. V\u00ed d\u1ee5, trong chu\u1ed7i l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m c\u1ee7a Rosemount ho\u1eb7c Endress+Hauser (E+H), h\u1eadu t\u1ed1 G (v\u00ed d\u1ee5: Rosemount 3051GP) bi\u1ec3u th\u1ecb b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i, trong khi h\u1eadu t\u1ed1 A (v\u00ed d\u1ee5: Rosemount 3051TA) bi\u1ec3u th\u1ecb b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i th\u01b0\u1eddng \u0111\u1eaft h\u01a1n t\u1eeb 10% \u0111\u1ebfn 20% do quy tr\u00ecnh ni\u00eam phong ch\u00e2n kh\u00f4ng si\u00eau nh\u1ecf t\u1ea1i nh\u00e0 m\u00e1y c\u1ea7n thi\u1ebft cho bu\u1ed3ng c\u1ea3m bi\u1ebfn tham chi\u1ebfu.<\/p>\n<\/li>\n

        • \n

          C\u1ea5u h\u00ecnh \u0111\u01b0\u1eddng \u1ed1ng xung v\u00e0 l\u1ed7 th\u00f4ng h\u01a1i: C\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i ph\u1ea3i c\u00f3 ph\u00eda \u00e1p su\u1ea5t th\u1ea5p (ph\u00eda L) ho\u1eb7c v\u1ecf \u0111i\u1ec7n t\u1eed \u0111\u01b0\u1ee3c th\u00f4ng h\u01a1i ra kh\u00ed quy\u1ec3n th\u00f4ng qua m\u1ed9t m\u00e0ng ch\u1ed1ng th\u1ea5m, tho\u00e1ng kh\u00ed chuy\u00ean d\u1ee5ng. N\u1ebfu c\u1ed5ng th\u00f4ng h\u01a1i n\u00e0y b\u1ecb t\u1eafc ngh\u1ebdn b\u1edfi b\u1ee5i b\u1ea9n, d\u1ea7u m\u1ee1 ho\u1eb7c s\u01a1n phun th\u1eeba, ch\u1ec9 s\u1ed1 c\u1ee7a b\u1ed9 truy\u1ec1n s\u1ebd b\u1ecb sai l\u1ec7ch theo th\u1eddi gian. C\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i c\u00f3 ph\u00eda \u00e1p su\u1ea5t th\u1ea5p \u0111\u01b0\u1ee3c h\u00fat ch\u00e2n kh\u00f4ng v\u00e0 b\u1ecbt k\u00edn v\u0129nh vi\u1ec5n t\u1ea1i nh\u00e0 m\u00e1y, ch\u1ec9 c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn ph\u00eda k\u1ebft n\u1ed1i v\u1edbi quy tr\u00ecnh \u00e1p su\u1ea5t cao.<\/p>\n<\/li>\n

        • \n

          Quy tr\u00ecnh hi\u1ec7u chu\u1ea9n: C\u00e1c d\u1ee5ng c\u1ee5 \u0111o \u00e1p su\u1ea5t c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111i\u1ec3m 0 m\u1ed7i 6 \u0111\u1ebfn 12 th\u00e1ng. M\u1ed9t b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n v\u1ec1 0 khi \u0111\u01b0\u1ee3c th\u00f4ng h\u01a1i ho\u00e0n to\u00e0n ra kh\u00f4ng kh\u00ed. Tuy nhi\u00ean, m\u1ed9t b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i s\u1ebd t\u1ef1 \u0111\u1ed9ng \u0111\u1ecdc \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n c\u1ee5c b\u1ed9 (kho\u1ea3ng 101,3 kPa) khi ti\u1ebfp x\u00fac v\u1edbi kh\u00f4ng kh\u00ed. \u0110\u1ec3 x\u00e1c minh \u0111i\u1ec3m 0 th\u1ef1c s\u1ef1 c\u1ee7a n\u00f3, c\u1ea7n ph\u1ea3i k\u1ebft n\u1ed1i n\u00f3 v\u1edbi m\u1ed9t b\u01a1m ch\u00e2n kh\u00f4ng ch\u00ednh x\u00e1c v\u00e0 h\u00fat ch\u00e2n kh\u00f4ng \u0111\u1ebfn m\u1ee9c ho\u00e0n to\u00e0n ch\u00e2n kh\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n

          06 Qu\u1ea3n l\u00fd mua s\u1eafm v\u00e0 chu\u1ed7i cung \u1ee9ng<\/h2>\n

          C\u00f4ng ty TNHH Th\u01b0\u01a1ng m\u1ea1i Xi'an Yunrui (Yunrui) chuy\u00ean ph\u00e2n ph\u1ed1i qu\u1ed1c t\u1ebf c\u00e1c thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t ch\u00ednh x\u00e1c cao v\u00e0 b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh quy tr\u00ecnh cho c\u00e1c ng\u00e0nh d\u1ea7u kh\u00ed, h\u00f3a ch\u1ea5t v\u00e0 s\u1ea3n xu\u1ea5t \u0111i\u1ec7n.<\/p>\n

          B\u1ed9 ph\u1eadn k\u1ef9 thu\u1eadt c\u1ee7a ch\u00fang t\u00f4i h\u1ed7 tr\u1ee3 kh\u00e1ch h\u00e0ng to\u00e0n c\u1ea7u trong vi\u1ec7c \u0111\u00e1nh gi\u00e1 ma tr\u1eadn l\u1ef1a ch\u1ecdn m\u00f4 h\u00ecnh, \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c m\u00e3 b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o, tuy\u1ec7t \u0111\u1ed1i ho\u1eb7c vi sai ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng. B\u1eb1ng c\u00e1ch t\u1eadn d\u1ee5ng kho d\u1ef1 tr\u1eef chi\u1ebfn l\u01b0\u1ee3c t\u1ea1i c\u01a1 s\u1edf h\u1eadu c\u1ea7n T\u00e2y An, ch\u00fang t\u00f4i gi\u1ea3m \u0111\u00e1ng k\u1ec3 th\u1eddi gian giao h\u00e0ng cho c\u00e1c c\u1ea5u h\u00ecnh ti\u00eau chu\u1ea9n. Nh\u00e2n vi\u00ean chu\u1ed7i cung \u1ee9ng c\u1ee7a ch\u00fang t\u00f4i th\u00f4ng th\u1ea1o c\u00e1c \u0111i\u1ec1u kho\u1ea3n Incoterms qu\u1ed1c t\u1ebf (nh\u01b0 DAP v\u00e0 DDP) v\u00e0 x\u1eed l\u00fd c\u00e1c th\u1ee7 t\u1ee5c h\u1ea3i quan ph\u1ee9c t\u1ea1p, ch\u1ee9ng nh\u1eadn truy xu\u1ea5t ngu\u1ed3n g\u1ed1c v\u1eadt li\u1ec7u v\u00e0 tu\u00e2n th\u1ee7 \u0111\u1ecba ch\u1ec9 k\u1ef9 thu\u1eadt s\u1ed1 khu v\u1ef1c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o giao h\u00e0ng su\u00f4n s\u1ebb tr\u00ean kh\u1eafp \u0110\u00f4ng Nam \u00c1 v\u00e0 Trung \u0110\u00f4ng.<\/p>","protected":false},"excerpt":{"rendered":"

          In industrial production, process control, and equipment maintenance, pressure measurement is one of the most fundamental yet critical variables. However, process engineers and technicians frequently misinterpret pressure readings during site commissioning or data calculations. Confusing gauge pressure (Gauge Pressure) with absolute pressure (Absolute Pressure) often leads to flow measurement errors, incorrect valve operations, and potential […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[384,1],"tags":[411,427,412,413,414,415,416,417,418,419,420,421,422,407,423,408,424,409,425,410,426,285],"class_list":["post-8201","post","type-post","status-publish","format-standard","hentry","category-news","category-blogs","tag-process-control","tag-b2b-industrial-supply","tag-pressure-transmitter","tag-rosemount","tag-fisher-valves","tag-eh","tag-pressure-unit-conversion","tag-differential-pressure","tag-vacuum-systems","tag-compressor-control","tag-flow-measurement","tag-industrial-automation","tag-oil-and-gas","tag-gauge-pressure","tag-chemical-processing","tag-absolute-pressure","tag-power-generation","tag-pressure-measurement","tag-instrument-calibration","tag-industrial-instrumentation","tag-xian-yunrui","tag-endresshauser"],"acf":[],"yoast_head":"\nGauge Pressure vs Absolute Pressure: Industrial Measurement Guide | Xi'an Yunrui<\/title>\n<meta name=\"description\" content=\"Learn the critical differences between gauge pressure and absolute pressure for industrial applications. Includes formulas, unit conversions, and instrument selection tips from Xi'an Yunrui Trading Co., Ltd.\" \/>\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.yunrui-controls.com\/vi\/understanding-gauge-and-absolute-pressure\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding Gauge and Absolute Pressure: A Comprehensive Technical Guide\" \/>\n<meta property=\"og:description\" content=\"Learn the critical differences between gauge pressure and absolute pressure for industrial applications. 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