{"id":8619,"date":"2026-06-26T19:00:36","date_gmt":"2026-06-26T19:00:36","guid":{"rendered":"https:\/\/www.yunrui-controls.com\/?p=8619"},"modified":"2026-06-26T19:00:36","modified_gmt":"2026-06-26T19:00:36","slug":"pressure-transmitter-working-principle","status":"publish","type":"post","link":"https:\/\/www.yunrui-controls.com\/vi\/pressure-transmitter-working-principle\/","title":{"rendered":"Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t: T\u1eeb l\u1ef1c t\u00e1c \u0111\u1ed9ng trong qu\u00e1 tr\u00ecnh \u0111\u1ebfn t\u00edn hi\u1ec7u 4-20mA."},"content":{"rendered":"<h2>B\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t th\u1ef1c ch\u1ea5t l\u00e0m nhi\u1ec7m v\u1ee5 g\u00ec?<\/h2>\n<p>A <strong>b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t<\/strong> l\u00e0 m\u1ed9t tr\u00ecnh th\u00f4ng d\u1ecbch ba b\u01b0\u1edbc: n\u00f3 <strong>c\u1ea3m nh\u1eadn l\u1ef1c v\u1eadt l\u00fd<\/strong>, N\u00f3 chuy\u1ec3n \u0111\u1ed5i l\u1ef1c \u0111\u00f3 th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n v\u00e0 cung c\u1ea5p t\u00edn hi\u1ec7u \u0111\u1ea7u ra k\u1ef9 thu\u1eadt s\u1ed1 ho\u1eb7c t\u01b0\u01a1ng t\u1ef1 ti\u00eau chu\u1ea9n cho h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n. Hi\u1ec3u \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y... <strong>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t<\/strong> \u0110\u00e2y l\u00e0 th\u00f4ng tin thi\u1ebft y\u1ebfu cho b\u1ea5t k\u1ef3 ai l\u1ef1a ch\u1ecdn, l\u1eafp \u0111\u1eb7t ho\u1eb7c kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng quy tr\u00ecnh. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, n\u00f3 cho h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n ph\u00e2n t\u00e1n (DCS) ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n l\u1eadp tr\u00ecnh (PLC) bi\u1ebft ch\u00ednh x\u00e1c l\u1ef1c \u0111\u1ea9y m\u00e0 ch\u1ea5t l\u1ecfng trong quy tr\u00ecnh \u0111ang t\u1ea1o ra.<\/p>\n<p>H\u00e3y h\u00ecnh dung n\u00f3 gi\u1ed1ng nh\u01b0 m\u1ed9t c\u00e1i c\u00e2n l\u00f2 xo c\u00f3 th\u00eam ch\u1ee9c n\u0103ng ph\u00e1t \u00e2m thanh. M\u00f4i ch\u1ea5t c\u1ea7n x\u1eed l\u00fd t\u00e1c \u0111\u1ed9ng l\u00ean m\u1ed9t b\u1ed9 ph\u1eadn c\u1ea3m bi\u1ebfn. B\u1ed9 ph\u1eadn \u0111\u00f3 s\u1ebd bi\u1ebfn d\u1ea1ng nh\u1eb9. B\u1ed9 ph\u00e1t t\u00edn hi\u1ec7u \u0111o s\u1ef1 bi\u1ebfn d\u1ea1ng \u0111\u00f3, chuy\u1ec3n \u0111\u1ed5i n\u00f3 th\u00e0nh d\u00f2ng \u0111i\u1ec7n 4-20 mA ho\u1eb7c giao th\u1ee9c k\u1ef9 thu\u1eadt s\u1ed1, v\u00e0 g\u1eedi t\u00edn hi\u1ec7u xu\u1ed1ng m\u1ed9t m\u1ea1ch hai d\u00e2y. Ng\u01b0\u1eddi v\u1eadn h\u00e0nh s\u1ebd th\u1ea5y gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t t\u00ednh b\u1eb1ng MPa, bar ho\u1eb7c psi \u2014 ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t mi\u1ebfng kim lo\u1ea1i b\u1ecb u\u1ed1n cong.<\/p>\n<div style=\"background: #f0f7ff; border-left: 4px solid #0066cc; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\ud83d\udd0d T\u00f3m l\u1ea1i trong m\u1ed9t c\u00e2u:<\/strong> B\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u201cl\u1ef1c \u0111\u1ea9y l\u00e0 bao nhi\u00eau?\u201d th\u00e0nh \u201c4,00 mA\u201d \u2014 m\u1ed9t ng\u00f4n ng\u1eef m\u00e0 h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n hi\u1ec3u \u0111\u01b0\u1ee3c.<\/p>\n<\/div>\n<h2>\u00c1p su\u1ea5t tr\u1edf th\u00e0nh t\u00edn hi\u1ec7u nh\u01b0 th\u1ebf n\u00e0o: Chu\u1ed7i c\u1ea3m bi\u1ebfn<\/h2>\n<h3>M\u00e0ng ng\u0103n c\u00e1ch ly: \u0110i\u1ec3m ti\u1ebfp x\u00fac \u0111\u1ea7u ti\u00ean<\/h3>\n<p>B\u1ed9 ph\u1eadn duy nh\u1ea5t c\u1ee7a b\u1ed9 ph\u00e1t ti\u1ebfp x\u00fac v\u1edbi quy tr\u00ecnh c\u1ee7a b\u1ea1n l\u00e0... <strong>m\u00e0ng ng\u0103n c\u00e1ch ly<\/strong>. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb th\u00e9p kh\u00f4ng g\u1ec9 316L, Hastelloy ho\u1eb7c tantali, m\u00e0ng kim lo\u1ea1i m\u1ecfng n\u00e0y ch\u1ec9 bi\u1ebfn d\u1ea1ng v\u00e0i micromet d\u01b0\u1edbi \u00e1p l\u1ef1c \u2014 nh\u1ecf h\u01a1n chi\u1ec1u r\u1ed9ng c\u1ee7a m\u1ed9t s\u1ee3i t\u00f3c ng\u01b0\u1eddi. S\u1ef1 chuy\u1ec3n \u0111\u1ed9ng nh\u1ecf b\u00e9 \u0111\u00f3 ch\u00ednh l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u cho to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh \u0111o.<\/p>\n<div style=\"background: #fff8f0; border-left: 4px solid #ff8800; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\u26a1 Th\u00f4ng tin nhanh:<\/strong> M\u00e0ng ng\u0103n c\u00e1ch ly \u0111i\u1ec3n h\u00ecnh ch\u1ec9 d\u00e0y 0,1 mm. D\u01b0\u1edbi \u00e1p su\u1ea5t t\u1ed1i \u0111a, n\u00f3 ch\u1ec9 di chuy\u1ec3n ch\u01b0a \u0111\u1ebfn 0,05 mm \u2014 kho\u1ea3ng b\u1eb1ng m\u1ed9t n\u1eeda \u0111\u1ed9 d\u00e0y c\u1ee7a m\u1ed9t t\u1edd gi\u1ea5y.<\/p>\n<\/div>\n<p>Ph\u00eda sau m\u00e0ng ng\u0103n l\u00e0 m\u1ed9t khoang ch\u1ee9a \u0111\u1ea7y ch\u1ea5t l\u1ecfng. <strong>d\u1ea7u silicon<\/strong> (ho\u1eb7c ch\u1ea5t l\u00e0m \u0111\u1ea7y fluorocarbon cho d\u1ecbch v\u1ee5 oxy). D\u1ea7u kh\u00f4ng n\u00e9n \u0111\u01b0\u1ee3c, do \u0111\u00f3 b\u1ea5t k\u1ef3 s\u1ef1 d\u1ecbch chuy\u1ec3n n\u00e0o c\u1ee7a m\u00e0ng ng\u0103n \u0111\u1ec1u \u0111\u01b0\u1ee3c truy\u1ec1n ch\u00ednh x\u00e1c \u0111\u1ebfn chip c\u1ea3m bi\u1ebfn b\u00ean trong th\u00e2n b\u1ed9 ph\u00e1t. Kh\u1edbp n\u1ed1i th\u1ee7y l\u1ef1c n\u00e0y gi\u00fap c\u00e1ch ly c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed kh\u1ecfi m\u00f4i tr\u01b0\u1eddng x\u1eed l\u00fd \u0103n m\u00f2n, n\u00f3ng ho\u1eb7c nh\u1edbt.<\/p>\n<h3>T\u1eeb s\u1ef1 d\u1ecbch chuy\u1ec3n v\u1eadt li\u1ec7u \u0111\u1ebfn \u0111i\u1ec7n n\u0103ng: Hai c\u00f4ng ngh\u1ec7 c\u1ed1t l\u00f5i<\/h3>\n<p>Khi ch\u1ea5t l\u1ecfng \u0111\u01b0\u1ee3c b\u01a1m v\u00e0o t\u1ea1o \u00e1p su\u1ea5t cho c\u1ea3m bi\u1ebfn b\u00ean trong, b\u1ed9 ph\u00e1t ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i bi\u1ebfn d\u1ea1ng c\u01a1 h\u1ecdc th\u00e0nh t\u00edn hi\u1ec7u m\u00e0 m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c. Hai c\u00f4ng ngh\u1ec7 ch\u00ednh chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p:<\/p>\n<h4>1. C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t \u0111i\u1ec7n tr\u1edf (Silicon khu\u1ebfch t\u00e1n)<\/h4>\n<p>M\u1ed9t t\u1ea5m silicon \u0111\u01b0\u1ee3c gia c\u00f4ng vi m\u00f4 \u0111\u1ec3 t\u1ea1o ra m\u1ed9t m\u00e0ng m\u1ecfng. B\u1ed1n \u0111i\u1ec7n tr\u1edf \u00e1p \u0111i\u1ec7n \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n l\u00ean m\u00e0ng n\u00e0y theo m\u1ed9t quy tr\u00ecnh nh\u1ea5t \u0111\u1ecbnh. <strong>C\u1ea7u Wheatstone<\/strong> C\u1ea5u h\u00ecnh nh\u01b0 sau: Khi \u00e1p su\u1ea5t l\u00e0m u\u1ed1n cong silicon, c\u00e1c \u0111i\u1ec7n tr\u1edf s\u1ebd thay \u0111\u1ed5i gi\u00e1 tr\u1ecb t\u1ef7 l\u1ec7 thu\u1eadn. M\u1ea1ch c\u1ea7u xu\u1ea5t ra t\u00edn hi\u1ec7u \u1edf m\u1ee9c milivolt \u2014 th\u01b0\u1eddng l\u00e0 100 mV ho\u1eb7c cao h\u01a1n \u1edf m\u1ee9c t\u1ed1i \u0111a.<\/p>\n<p>M\u1ea1ch \u0111i\u1ec7n t\u1eed t\u00edch h\u1ee3p khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u y\u1ebfu n\u00e0y, \u00e1p d\u1ee5ng b\u00f9 nhi\u1ec7t \u0111\u1ed9 v\u00e0 tuy\u1ebfn t\u00ednh h\u00f3a t\u00edn hi\u1ec7u \u0111\u1ea7u ra. K\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u \u1ed5n \u0111\u1ecbnh t\u1eeb 4-20 mA thay \u0111\u1ed5i m\u01b0\u1ee3t m\u00e0 t\u1eeb 0 \u0111\u1ebfn to\u00e0n thang \u0111o. C\u00f4ng ngh\u1ec7 n\u00e0y ti\u1ebft ki\u1ec7m chi ph\u00ed, mang l\u1ea1i \u0111\u1ed9 l\u1eb7p l\u1ea1i tuy\u1ec7t v\u1eddi v\u00e0 chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c \u1ee9ng d\u1ee5ng quy tr\u00ecnh chung.<\/p>\n<h4>2. C\u1ea3m bi\u1ebfn \u0111i\u1ec7n dung<\/h4>\n<p>Trong c\u00e1c thi\u1ebft k\u1ebf t\u1ee5 \u0111i\u1ec7n, \u00e1p su\u1ea5t l\u00e0m bi\u1ebfn d\u1ea1ng m\u1ed9t m\u00e0ng kim lo\u1ea1i \u0111\u00f3ng vai tr\u00f2 l\u00e0 m\u1ed9t b\u1ea3n c\u1ef1c c\u1ee7a t\u1ee5 \u0111i\u1ec7n. B\u1ea3n c\u1ef1c c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh. Khi kho\u1ea3ng c\u00e1ch gi\u1eefa hai b\u1ea3n c\u1ef1c thay \u0111\u1ed5i, \u0111i\u1ec7n dung thay \u0111\u1ed5i theo t\u1ef7 l\u1ec7 ngh\u1ecbch. M\u1ed9t m\u1ea1ch t\u1ea7n s\u1ed1 cao s\u1ebd \u0111o s\u1ef1 thay \u0111\u1ed5i \u0111i\u1ec7n dung n\u00e0y v\u00e0 chuy\u1ec3n \u0111\u1ed5i n\u00f3 th\u00e0nh \u0111i\u1ec7n \u00e1p t\u1ef7 l\u1ec7 thu\u1eadn.<\/p>\n<p>C\u1ea3m bi\u1ebfn \u0111i\u1ec7n dung c\u00f3 \u01b0u \u0111i\u1ec3m v\u01b0\u1ee3t tr\u1ed9i \u1edf c\u00e1c kh\u00eda c\u1ea1nh sau: <strong>\u0111o \u00e1p su\u1ea5t th\u1ea5p v\u00e0 \u00e1p su\u1ea5t ch\u00eanh l\u1ec7ch<\/strong> Trong tr\u01b0\u1eddng h\u1ee3p c\u1ea7n ph\u1ea3i gi\u1ea3i quy\u1ebft nh\u1eefng bi\u1ebfn d\u1ea1ng nh\u1ecf v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao. Ch\u00fang c\u0169ng ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c s\u1ef1 ki\u1ec7n qu\u00e1 \u00e1p t\u1ed1t h\u01a1n so v\u1edbi c\u00e1c thi\u1ebft k\u1ebf \u0111i\u1ec7n tr\u1edf \u00e1p su\u1ea5t trong m\u1ed9t s\u1ed1 c\u1ea5u h\u00ecnh.<\/p>\n<p><strong>Chu\u1ed7i n\u00e0y lu\u00f4n lu\u00f4n gi\u1ed1ng nhau:<\/strong> \u00c1p su\u1ea5t qu\u00e1 tr\u00ecnh \u2192 d\u1ecbch chuy\u1ec3n m\u00e0ng ng\u0103n \u2192 truy\u1ec1n ch\u1ea5t l\u1ecfng l\u00e0m \u0111\u1ea7y \u2192 bi\u1ebfn d\u1ea1ng c\u1ea3m bi\u1ebfn \u2192 thay \u0111\u1ed5i \u0111i\u1ec7n \u2192 t\u00edn hi\u1ec7u \u0111\u1ea7u ra 4-20 mA ho\u1eb7c t\u00edn hi\u1ec7u s\u1ed1 \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 x\u1eed l\u00fd.<\/p>\n<h2>\u0110i\u1ec3m 0, Kho\u1ea3ng \u0111o v\u00e0 Gi\u1ea3m \u00e2m l\u01b0\u1ee3ng: Thi\u1ebft l\u1eadp c\u1eeda s\u1ed5 \u0111o<\/h2>\n<p>M\u1ed7i b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o cho m\u1ed9t ph\u1ea1m vi \u0111o c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi hai gi\u00e1 tr\u1ecb:<\/p>\n<ul>\n<li><strong>S\u1ed1 kh\u00f4ng (LRV \u2014 Gi\u00e1 tr\u1ecb ph\u1ea1m vi d\u01b0\u1edbi):<\/strong> \u00c1p su\u1ea5t t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n 4 mA. Trong b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o \u00e1p su\u1ea5t 0-1 MPa, \u0111i\u1ec3m 0 t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n (0 MPaG).<\/li>\n<li><strong>Nh\u1ecbp (URV \u2013 LRV):<\/strong> S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa gi\u00e1 tr\u1ecb ph\u1ea1m vi tr\u00ean v\u00e0 ph\u1ea1m vi d\u01b0\u1edbi. M\u1ed9t b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u 0-1 MPa c\u00f3 d\u1ea3i \u0111o 1 MPa.<\/li>\n<\/ul>\n<p>Ng\u00f5 ra 4-20 mA bi\u1ebfn thi\u00ean tuy\u1ebfn t\u00ednh tr\u00ean to\u00e0n d\u1ea3i n\u00e0y. \u1ede v\u1ecb tr\u00ed 0,% c\u1ee7a d\u1ea3i \u0111o, b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c 4 mA. \u1ede v\u1ecb tr\u00ed 10,0%, b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c 20 mA. \u1ede v\u1ecb tr\u00ed 50,0%, b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c 12 mA. \u0110\u01a1n gi\u1ea3n, d\u1ec5 d\u1ef1 \u0111o\u00e1n, ph\u1ed5 qu\u00e1t.<\/p>\n<h3>T\u1ef7 l\u1ec7 gi\u1ea3m t\u1ea3i: T\u00ednh linh ho\u1ea1t c\u00f3 gi\u1edbi h\u1ea1n<\/h3>\n<p>C\u00e1c thi\u1ebft b\u1ecb ph\u00e1t t\u00edn hi\u1ec7u th\u00f4ng minh cho ph\u00e9p b\u1ea1n <strong>s\u1eafp x\u1ebfp l\u1ea1i<\/strong> Thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n t\u1eed. M\u1ed9t b\u1ed9 ph\u00e1t t\u00edn hi\u1ec7u c\u00f3 \u0111\u1ecbnh m\u1ee9c 0-1 MPa c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh l\u1ea1i cho d\u1ea3i \u0111o 0-100 kPa \u2014 t\u1ef7 l\u1ec7 \u0111i\u1ec1u ch\u1ec9nh 10:1. M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb hi\u1ec7n \u0111\u1ea1i cung c\u1ea5p t\u1ef7 l\u1ec7 \u0111i\u1ec1u ch\u1ec9nh 100:1, v\u1edbi c\u00e1c thi\u1ebft k\u1ebf chuy\u00ean d\u1ee5ng \u0111\u1ea1t t\u1ef7 l\u1ec7 cao h\u01a1n.<\/p>\n<div style=\"background: #f5fff5; border-left: 4px solid #00aa44; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\ud83d\udcca V\u00ed d\u1ee5:<\/strong> B\u1ed9 ph\u00e1t t\u00edn hi\u1ec7u 0-1 MPa \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh l\u1ea1i ph\u1ea1m vi \u0111o th\u00e0nh 0-100 kPa v\u1eabn s\u1eed d\u1ee5ng to\u00e0n b\u1ed9 d\u1ea3i t\u00edn hi\u1ec7u 16 mA (4-20 mA) \u2014 nh\u01b0ng gi\u1edd \u0111\u00e2y m\u1ed7i mA ch\u1ec9 \u0111\u1ea1i di\u1ec7n cho 6,25 kPa thay v\u00ec 62,5 kPa. \u0110\u1ed9 ph\u00e2n gi\u1ea3i \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n, nh\u01b0ng \u0111\u1ed3ng th\u1eddi kh\u1ea3 n\u0103ng b\u1ecb nhi\u1ec5u \u0111i\u1ec7n c\u0169ng t\u0103ng l\u00ean.<\/p>\n<\/div>\n<p>Nh\u01b0ng c\u00f3 m\u1ed9t s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i. Khi b\u1ea1n thu h\u1eb9p d\u1ea3i \u0111o, b\u1ea1n c\u0169ng l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean nhi\u1ec5u. T\u1ef7 l\u1ec7 thu h\u1eb9p 100:1 c\u00f3 ngh\u0129a l\u00e0 m\u1ea1ch \u0111i\u1ec7n t\u1eed ph\u1ea3i ph\u00e2n gi\u1ea3i \u0111\u01b0\u1ee3c 1% c\u1ee7a thang \u0111o \u0111\u1ea7y \u0111\u1ee7 v\u1edbi c\u00f9ng \u0111\u1ed9 ch\u00ednh x\u00e1c tuy\u1ec7t \u0111\u1ed1i. \u0110\u1ed9 ch\u00ednh x\u00e1c tham chi\u1ebfu, th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng ph\u1ea7n tr\u0103m c\u1ee7a d\u1ea3i \u0111o \u0111\u00e3 hi\u1ec7u chu\u1ea9n, s\u1ebd gi\u1ea3m theo t\u1ef7 l\u1ec7 thu\u1eadn. B\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 linh ho\u1ea1t; nh\u01b0ng ph\u1ea3i hy sinh m\u1ed9t ch\u00fat \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n<div style=\"background: #fff0f0; border-left: 4px solid #cc0000; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\u26a0\ufe0f Quy t\u1eafc quan tr\u1ecdng:<\/strong> B\u1ea1n lu\u00f4n c\u00f3 th\u1ec3 thu h\u1eb9p ph\u1ea1m vi \u0111o. Nh\u01b0ng b\u1ea1n kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c ph\u00e9p v\u01b0\u1ee3t qu\u00e1 \u00e1p su\u1ea5t t\u1ed1i \u0111a m\u00e0 c\u1ea3m bi\u1ebfn cho ph\u00e9p m\u1ed9t c\u00e1ch an to\u00e0n. \u00c1p su\u1ea5t qu\u00e1 cao s\u1ebd g\u00e2y bi\u1ebfn d\u1ea1ng m\u00e0ng ch\u1eafn v\u0129nh vi\u1ec5n \u2014 m\u1ed9t s\u1ef1 sai l\u1ec7ch hi\u1ec7u chu\u1ea9n m\u00e0 kh\u00f4ng c\u00f3 c\u00e1ch n\u00e0o kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh l\u1ea1i ph\u1ea1m vi \u0111o.<\/p>\n<\/div>\n<h2>\u00c1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i, \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i v\u00e0 \u00e1p su\u1ea5t ch\u00eanh l\u1ec7ch: Ba c\u00e1ch \u0111o \u00e1p su\u1ea5t.<\/h2>\n<p>\u0110\u00e2y l\u00e0 \u0111i\u1ec3m m\u00e0 c\u00e1c k\u1ef9 s\u01b0 hi\u1ec7n tr\u01b0\u1eddng th\u01b0\u1eddng g\u1eb7p kh\u00f3 kh\u0103n. C\u00f9ng m\u1ed9t t\u00edn hi\u1ec7u 4-20 mA l\u1ea1i mang \u00fd ngh\u0129a ho\u00e0n to\u00e0n kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o t\u00edn hi\u1ec7u m\u00e0 b\u1ed9 ph\u00e1t \u0111ang so s\u00e1nh.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>\u0110i\u1ec3m tham chi\u1ebfu<\/th>\n<th>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<th>Quy \u01b0\u1edbc \u0111\u01a1n v\u1ecb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Th\u01b0\u1edbc \u0111o (G)<\/strong><\/td>\n<td>\u00c1p su\u1ea5t kh\u00ed quy\u1ec3n<\/td>\n<td>\u00c1p su\u1ea5t trong b\u1ed3n, \u00e1p su\u1ea5t \u0111\u01b0\u1eddng \u1ed1ng, l\u01b0u l\u01b0\u1ee3ng b\u01a1m<\/td>\n<td>MPaG, barG, psig<\/td>\n<\/tr>\n<tr>\n<td><strong>Tuy\u1ec7t \u0111\u1ed1i (A)<\/strong><\/td>\n<td>Ch\u00e2n kh\u00f4ng ho\u00e0n h\u1ea3o (\u00e1p su\u1ea5t b\u1eb1ng kh\u00f4ng)<\/td>\n<td>H\u1ec7 th\u1ed1ng ch\u00e2n kh\u00f4ng, \u0111o \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n, \u00e1p su\u1ea5t h\u01a1i<\/td>\n<td>MPaA, barA, psia<\/td>\n<\/tr>\n<tr>\n<td><strong>Vi ph\u00e2n (DP)<\/strong><\/td>\n<td>M\u1ed9t \u0111i\u1ec3m \u00e1p l\u1ef1c kh\u00e1c c\u1ee7a quy tr\u00ecnh<\/td>\n<td>\u0110o l\u01b0u l\u01b0\u1ee3ng qua l\u1ed7, gi\u00e1m s\u00e1t b\u1ed9 l\u1ecdc, m\u1ee9c ch\u1ea5t l\u1ecfng<\/td>\n<td>kPaDP, mbarDP, inH2O<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>M\u1ed1i quan h\u1ec7 quan tr\u1ecdng nh\u1ea5t<\/h3>\n<p><strong>\u00c1p su\u1ea5t d\u01b0 = \u00c1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u2013 \u00c1p su\u1ea5t kh\u00ed quy\u1ec3n<\/strong><\/p>\n<div style=\"background: #f0f7ff; border-left: 4px solid #0066cc; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\ud83e\uddee V\u00ed d\u1ee5 th\u1ef1c t\u1ebf:<\/strong> \u1ede m\u1ef1c n\u01b0\u1edbc bi\u1ec3n, \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n x\u1ea5p x\u1ec9 101,3 kPaA (14,7 psia). M\u1ed9t t\u00e0u c\u00f3 \u00e1p su\u1ea5t 200 kPaG th\u1ef1c t\u1ebf \u0111ang \u1edf m\u1ee9c 301,3 kPaA. N\u1ebfu b\u1ea1n di chuy\u1ec3n c\u00f9ng m\u1ed9t thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t \u0111\u00f3 l\u00ean v\u00f9ng n\u00fai c\u00f3 \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n l\u00e0 80 kPaA, n\u00f3 v\u1eabn hi\u1ec3n th\u1ecb 200 kPaG \u2014 v\u00ec n\u00f3 lu\u00f4n tr\u1eeb \u0111i \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n tham chi\u1ebfu t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng. M\u1ed9t thi\u1ebft b\u1ecb \u0111o \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u1eb7t tr\u00ean c\u00f9ng t\u00e0u \u0111\u00f3 s\u1ebd hi\u1ec3n th\u1ecb 301,3 kPaA b\u1ea5t k\u1ec3 \u0111\u1ed9 cao.<\/p>\n<\/div>\n<div style=\"background: #f8f8f8; border: 1px solid #ddd; padding: 15px 20px; margin: 20px 0; border-radius: 4px;\">\n<p style=\"margin: 0 0 10px 0; font-weight: bold;\">\ud83e\udde0 M\u1eb9o ghi nh\u1edb:<\/p>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li><strong>\u0110\u1ed3ng h\u1ed3 \u0111o<\/strong> H\u1ecfi &quot;cao h\u01a1n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng bao nhi\u00eau?&quot;\u201c<\/li>\n<li><strong>Tuy\u1ec7t \u0111\u1ed1i<\/strong> H\u1ecfi &quot;cao h\u01a1n ch\u00e2n kh\u00f4ng bao nhi\u00eau?&quot;\u201c<\/li>\n<li><strong>Vi ph\u00e2n<\/strong> C\u00e2u h\u1ecfi \u0111\u1eb7t ra l\u00e0 \u201cS\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa hai \u0111i\u1ec3m n\u00e0y l\u00e0 g\u00ec?\u201d<\/li>\n<\/ul>\n<\/div>\n<h3>Ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t: Y\u1ebfu t\u1ed1 then ch\u1ed1t trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh l\u01b0u l\u01b0\u1ee3ng v\u00e0 m\u1ee9c \u0111\u1ed9.<\/h3>\n<p>C\u00e1c b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u DP x\u1ee9ng \u0111\u00e1ng \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp \u0111\u1eb7c bi\u1ec7t v\u00ec ch\u00fang gi\u1ea3i quy\u1ebft hai trong s\u1ed1 nh\u1eefng v\u1ea5n \u0111\u1ec1 \u0111o l\u01b0\u1eddng ph\u1ed5 bi\u1ebfn nh\u1ea5t trong c\u00e1c nh\u00e0 m\u00e1y ch\u1ebf bi\u1ebfn:<\/p>\n<ul>\n<li><strong>\u0110o l\u01b0u l\u01b0\u1ee3ng:<\/strong> M\u1ed9t t\u1ea5m ch\u1eafn l\u1ed7, \u1ed1ng Venturi ho\u1eb7c \u1ed1ng Pitot t\u1ea1o ra s\u1ef1 gi\u1ea3m \u00e1p su\u1ea5t t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng l\u01b0u l\u01b0\u1ee3ng. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u DP \u0111o s\u1ef1 gi\u1ea3m \u00e1p su\u1ea5t \u0111\u00f3. Ph\u00e9p l\u1ea5y c\u0103n b\u1eadc hai (\u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u ho\u1eb7c DCS) chuy\u1ec3n \u0111\u1ed5i DP th\u00e0nh l\u01b0u l\u01b0\u1ee3ng.<\/li>\n<li><strong>\u0110o m\u1ee9c:<\/strong> Trong m\u1ed9t b\u1ec3 k\u00edn, chi\u1ec1u cao ch\u1ea5t l\u1ecfng t\u1ea1o ra \u00e1p su\u1ea5t th\u1ee7y t\u0129nh. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t (DP transmitter) so s\u00e1nh \u00e1p su\u1ea5t \u1edf \u0111\u00e1y b\u1ec3 v\u1edbi \u00e1p su\u1ea5t kh\u00ed \u1edf \u0111\u1ec9nh b\u1ec3. S\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y ch\u00ednh l\u00e0 c\u1ed9t \u00e1p ch\u1ea5t l\u1ecfng. Khi bi\u1ebft m\u1eadt \u0111\u1ed9 ch\u1ea5t l\u1ecfng, b\u1ea1n c\u00f3 th\u1ec3 t\u00ednh to\u00e1n m\u1ef1c ch\u1ea5t l\u1ecfng tr\u1ef1c ti\u1ebfp.<\/li>\n<\/ul>\n<h2>M\u1ea1ch v\u00f2ng hai d\u00e2y: Ngu\u1ed3n v\u00e0 t\u00edn hi\u1ec7u tr\u00ean c\u00f9ng m\u1ed9t c\u1eb7p d\u00e2y.<\/h2>\n<p>H\u1ea7u h\u1ebft c\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t trong th\u1ef1c t\u1ebf s\u1eed d\u1ee5ng <strong>hai d\u00e2y 4-20 mA<\/strong> K\u1ebft n\u1ed1i. Hai d\u00e2y d\u1eabn ch\u1ea1y t\u1eeb th\u1ebb \u0111\u1ea7u v\u00e0o analog c\u1ee7a h\u1ec7 th\u1ed1ng DCS \u0111\u1ebfn b\u1ed9 ph\u00e1t. H\u1ec7 th\u1ed1ng DCS cung c\u1ea5p \u0111i\u1ec7n \u00e1p 24 VDC. B\u1ed9 ph\u00e1t l\u1ea5y d\u00f2ng \u0111i\u1ec7n t\u1eeb m\u1ea1ch n\u00e0y \u0111\u1ec3 c\u1ea5p ngu\u1ed3n cho c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed c\u1ee7a n\u00f3 \u2014 th\u00f4ng th\u01b0\u1eddng t\u1ed1i thi\u1ec3u l\u00e0 3,6-4 mA. L\u01b0\u1ee3ng d\u00f2ng \u0111i\u1ec7n c\u00f2n l\u1ea1i, t\u1eeb 4 mA \u0111\u1ebfn 20 mA, \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o.<\/p>\n<p>Thi\u1ebft k\u1ebf n\u00e0y r\u1ea5t thanh l\u1ecbch. Kh\u00f4ng c\u1ea7n d\u00e2y ngu\u1ed3n ri\u00eang. Kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u v\u00f2ng n\u1ed1i \u0111\u1ea5t do nhi\u1ec1u b\u1ed9 ngu\u1ed3n g\u00e2y ra. Ch\u1ec9 c\u1ea7n m\u1ed9t c\u1eb7p d\u00e2y l\u00e0 \u0111\u1ee7.<\/p>\n<p>B\u00ean trong h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n ph\u00e2n t\u00e1n (DCS), m\u1ed9t \u0111i\u1ec7n tr\u1edf ch\u00ednh x\u00e1c 250 \u03a9 chuy\u1ec3n \u0111\u1ed5i d\u00f2ng \u0111i\u1ec7n 4-20 mA th\u00e0nh \u0111i\u1ec7n \u00e1p 1-5 V. B\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u01b0\u01a1ng t\u1ef1 sang s\u1ed1 s\u1ebd \u0111\u1ecdc \u0111i\u1ec7n \u00e1p \u0111\u00f3. \u1ede d\u00f2ng \u0111i\u1ec7n 4 mA, b\u1ea1n s\u1ebd th\u1ea5y 1 V. \u1ede d\u00f2ng \u0111i\u1ec7n 20 mA, b\u1ea1n s\u1ebd th\u1ea5y 5 V. H\u1ec7 th\u1ed1ng DCS s\u1ebd chuy\u1ec3n \u0111\u1ed5i gi\u00e1 tr\u1ecb n\u00e0y sang c\u00e1c \u0111\u01a1n v\u1ecb k\u1ef9 thu\u1eadt \u2014 MPa, bar, inch c\u1ed9t n\u01b0\u1edbc \u2014 cho ng\u01b0\u1eddi v\u1eadn h\u00e0nh.<\/p>\n<h3>T\u1ea1i sao 4 mA l\u00e0 m\u1ee9c t\u1ed1i thi\u1ec3u, ch\u1ee9 kh\u00f4ng ph\u1ea3i 0 mA?<\/h3>\n<p>4 mA kh\u00f4ng ph\u1ea3i l\u00e0 con s\u1ed1 ng\u1eabu nhi\u00ean. \u0110\u00f3 l\u00e0 <strong>s\u1ed1ng kh\u00f4ng<\/strong> M\u1ea1ch n\u00e0y duy tr\u00ec ngu\u1ed3n \u0111i\u1ec7n cho m\u00e1y ph\u00e1t \u1edf m\u1ee9c t\u00edn hi\u1ec7u t\u1ed1i thi\u1ec3u. N\u1ebfu d\u00f2ng \u0111i\u1ec7n gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 3,6 mA, h\u1ec7 th\u1ed1ng DCS s\u1ebd bi\u1ebft c\u00f3 v\u1ea5n \u0111\u1ec1 \u2014 d\u00e2y b\u1ecb \u0111\u1ee9t, c\u1ea7u ch\u00ec b\u1ecb ch\u00e1y ho\u1eb7c m\u00e1y ph\u00e1t b\u1ecb h\u1ecfng. <strong>c\u1ea3nh b\u00e1o l\u1ed7i m\u1ee9c th\u1ea5p<\/strong> \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o ti\u00eau chu\u1ea9n. D\u00f2ng \u0111i\u1ec7n 0 mA th\u1ef1c s\u1ef1 s\u1ebd kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c v\u1edbi m\u1ed9t v\u00f2ng l\u1eb7p ch\u1ebft.<\/p>\n<div style=\"background: #f5fff5; border-left: 4px solid #00aa44; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0; font-size: 15px;\"><strong>\ud83d\udca1 Sao kh\u00f4ng ph\u1ea3i l\u00e0 0-20 mA?<\/strong> V\u1edbi m\u1ee9c 0 mA, d\u00e2y b\u1ecb \u0111\u1ee9t v\u00e0 ch\u1ec9 s\u1ed1 \u00e1p su\u1ea5t b\u1eb1ng 0 h\u1ee3p l\u1ec7 tr\u00f4ng gi\u1ed1ng h\u1ec7t nhau. M\u1ee9c 4 mA khi c\u00f3 t\u00edn hi\u1ec7u 0 t\u1ea1o ra &quot;nh\u1ecbp tim&quot; \u2014 mi\u1ec5n l\u00e0 m\u1ea1ch v\u00f2ng hi\u1ec3n th\u1ecb 4 mA tr\u1edf l\u00ean, b\u1ea1n bi\u1ebft r\u1eb1ng b\u1ed9 ph\u00e1t \u0111ang ho\u1ea1t \u0111\u1ed9ng v\u00e0 truy\u1ec1n t\u00edn hi\u1ec7u.<\/p>\n<\/div>\n<p>C\u00e1c b\u1ed9 ph\u00e1t th\u00f4ng minh hi\u1ec7n \u0111\u1ea1i c\u0169ng c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n <strong>d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1<\/strong> \u2014 th\u01b0\u1eddng l\u00e0 3,6 mA ho\u1eb7c 22 mA \u2014 \u0111\u1ec3 b\u00e1o hi\u1ec7u r\u00f5 r\u00e0ng l\u1ed7i c\u1ea3m bi\u1ebfn, t\u00ecnh tr\u1ea1ng v\u01b0\u1ee3t qu\u00e1 ph\u1ea1m vi ho\u1eb7c c\u1ea3nh b\u00e1o ch\u1ea9n \u0111o\u00e1n.<\/p>\n<h2>Khi m\u00e0ng ng\u0103n b\u1ecb h\u1ecfng: Ch\u1ea9n \u0111o\u00e1n t\u1ea1i ch\u1ed7<\/h2>\n<p>M\u00e0ng ng\u0103n c\u00e1ch ly v\u1eeba l\u00e0 \u0111i\u1ec3m m\u1ea1nh v\u1eeba l\u00e0 \u0111i\u1ec3m y\u1ebfu c\u1ee7a m\u00e1y ph\u00e1t. \u0110\u00e2y l\u00e0 b\u1ed9 ph\u1eadn duy nh\u1ea5t ti\u1ebfp x\u00fac v\u1edbi ch\u1ea5t l\u1ecfng v\u00e0 l\u1ea1i r\u1ea5t m\u1ecfng. C\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0102n m\u00f2n:<\/strong> C\u00e1c h\u00f3a ch\u1ea5t m\u1ea1nh t\u1ea5n c\u00f4ng v\u1eadt li\u1ec7u m\u00e0ng ng\u0103n. M\u1ed9t l\u1ed7 nh\u1ecf r\u00f2 r\u1ec9 cho ph\u00e9p ch\u1ea5t l\u1ecfng tr\u00e0n v\u00e0o h\u1ec7 th\u1ed1ng. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u b\u1ecb l\u1ec7ch, sau \u0111\u00f3 b\u1ecb k\u1eb9t, do m\u1ea5t k\u1ebft n\u1ed1i th\u1ee7y l\u1ef1c.<\/li>\n<li><strong>\u00c1p su\u1ea5t qu\u00e1 cao:<\/strong> \u00c1p su\u1ea5t t\u0103ng \u0111\u1ed9t ng\u1ed9t v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n c\u1ee7a c\u1ea3m bi\u1ebfn s\u1ebd l\u00e0m bi\u1ebfn d\u1ea1ng v\u0129nh vi\u1ec5n m\u00e0ng ng\u0103n. Hi\u1ec7n t\u01b0\u1ee3ng d\u1ecbch chuy\u1ec3n \u0111i\u1ec3m 0. D\u1ea3i \u0111o thay \u0111\u1ed5i. B\u1ed9 ph\u00e1t c\u00f3 th\u1ec3 v\u1eabn ph\u00e1t ra t\u00edn hi\u1ec7u, nh\u01b0ng t\u00edn hi\u1ec7u \u0111\u00f3 kh\u00f4ng c\u00f2n \u0111\u00e1ng tin c\u1eady n\u1eefa.<\/li>\n<li><strong>L\u1edbp ph\u1ee7 v\u00e0 s\u1ef1 b\u00e1m b\u1ea9n:<\/strong> C\u00e1c ch\u1ea5t c\u00f3 \u0111\u1ed9 nh\u1edbt ho\u1eb7c k\u1ebft tinh t\u00edch t\u1ee5 tr\u00ean m\u00e0ng ng\u0103n. Kh\u1ed1i l\u01b0\u1ee3ng t\u0103ng th\u00eam l\u00e0m gi\u1ea3m \u0111\u1ed9 nh\u1ea1y. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u ph\u1ea3n h\u1ed3i ch\u1eadm h\u01a1n so v\u1edbi s\u1ef1 thay \u0111\u1ed5i \u00e1p su\u1ea5t th\u1ef1c t\u1ebf. Trong tr\u01b0\u1eddng h\u1ee3p nghi\u00eam tr\u1ecdng, l\u1edbp ph\u1ee7 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t l\u1edbp c\u1ee9ng v\u00e0 b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u tr\u1edf n\u00ean kh\u00f4ng ph\u1ea3n h\u1ed3i.<\/li>\n<li><strong>H\u01b0 h\u1ecfng c\u01a1 h\u1ecdc:<\/strong> C\u00e1c tia l\u1eeda h\u00e0n, m\u1ea3nh v\u1ee5n kim lo\u1ea1i ho\u1eb7c thao t\u00e1c kh\u00f4ng \u0111\u00fang c\u00e1ch c\u00f3 th\u1ec3 l\u00e0m l\u00f5m ho\u1eb7c x\u01b0\u1edbc m\u00e0ng ng\u0103n. S\u1ef1 t\u1eadp trung \u1ee9ng su\u1ea5t c\u1ee5c b\u1ed9 t\u1ea1o ra h\u00e0nh vi kh\u00f3 l\u01b0\u1eddng.<\/li>\n<\/ul>\n<h3>Ki\u1ec3m tra nhanh t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/h3>\n<p>Khi k\u1ebft qu\u1ea3 \u0111o \u00e1p su\u1ea5t c\u00f3 v\u1ebb b\u1ea5t th\u01b0\u1eddng, h\u00e3y c\u00e1ch ly b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u v\u00e0 x\u1ea3 kh\u00ed t\u1eeb \u0111\u01b0\u1eddng \u1ed1ng k\u1ebft n\u1ed1i ra m\u00f4i tr\u01b0\u1eddng. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o \u00e1p su\u1ea5t ph\u1ea3i hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb b\u1eb1ng kh\u00f4ng (ho\u1eb7c r\u1ea5t g\u1ea7n b\u1eb1ng kh\u00f4ng). N\u1ebfu n\u00f3 hi\u1ec3n th\u1ecb m\u1ed9t gi\u00e1 tr\u1ecb l\u1ec7ch c\u1ed1 \u0111\u1ecbnh, m\u00e0ng ng\u0103n c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng ho\u1eb7c c\u1ea3m bi\u1ebfn \u0111\u00e3 b\u1ecb d\u1ecbch chuy\u1ec3n v\u1ec1 0.<\/p>\n<div style=\"background: #f8f8f8; border: 1px solid #ddd; padding: 15px 20px; margin: 20px 0; border-radius: 4px;\">\n<p style=\"margin: 0 0 10px 0; font-weight: bold;\">\ud83d\udd27 Quy tr\u00ecnh ch\u1ea9n \u0111o\u00e1n hai b\u01b0\u1edbc:<\/p>\n<ol style=\"margin: 0; padding-left: 20px;\">\n<li><strong>Ki\u1ec3m tra s\u1ed1 0:<\/strong> X\u1ea3 kh\u00ed ra ngo\u00e0i m\u00f4i tr\u01b0\u1eddng. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o ph\u1ea3i hi\u1ec3n th\u1ecb 0. \u0110\u1ed9 l\u1ec7ch c\u1ed1 \u0111\u1ecbnh = m\u00e0ng ng\u0103n b\u1ecb h\u1ecfng ho\u1eb7c tr\u00f4i v\u1ec1 0.<\/li>\n<li><strong>Ki\u1ec3m tra v\u00f2ng l\u1eb7p:<\/strong> C\u1ea5p d\u00f2ng \u0111i\u1ec7n 12 mA t\u1eeb b\u1ed9 hi\u1ec7u chu\u1ea9n tr\u1ef1c ti\u1ebfp v\u00e0o k\u00eanh DCS. N\u1ebfu DCS \u0111\u1ecdc \u0111\u01b0\u1ee3c 50%, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf ph\u00eda tr\u01b0\u1edbc (b\u1ed9 ph\u00e1t, \u0111\u01b0\u1eddng d\u00e2y xung, k\u1ebft n\u1ed1i quy tr\u00ecnh). N\u1ebfu DCS \u0111\u1ecdc sai, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf bo m\u1ea1ch, c\u1ea5u h\u00ecnh ho\u1eb7c d\u00e2y d\u1eabn.<\/li>\n<\/ol>\n<\/div>\n<p>S\u1eed d\u1ee5ng b\u1ed9 hi\u1ec7u chu\u1ea9n v\u00f2ng l\u1eb7p \u0111\u1ec3 \u0111\u01b0a tr\u1ef1c ti\u1ebfp t\u00edn hi\u1ec7u 4-20 mA \u0111\u00e3 bi\u1ebft v\u00e0o k\u00eanh DCS. N\u1ebfu DCS \u0111\u1ecdc \u0111\u00fang, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf ph\u00eda tr\u01b0\u1edbc \u2014 b\u1ed9 ph\u00e1t, \u0111\u01b0\u1eddng d\u00e2y xung ho\u1eb7c k\u1ebft n\u1ed1i quy tr\u00ecnh. N\u1ebfu DCS v\u1eabn \u0111\u1ecdc sai, v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf bo m\u1ea1ch, c\u1ea5u h\u00ecnh ho\u1eb7c d\u00e2y d\u1eabn.<\/p>\n<h3>Quy t\u1eafc x\u1eed l\u00fd<\/h3>\n<div style=\"background: #fff0f0; border-left: 4px solid #cc0000; padding: 15px 20px; margin: 20px 0;\">\n<p style=\"margin: 0 0 10px 0; font-weight: bold;\">\ud83d\udeab Kh\u00f4ng bao gi\u1edd:<\/p>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li>D\u00f9ng d\u1ee5ng c\u1ee5, ng\u00f3n tay ho\u1eb7c v\u1eadt c\u1ee9ng \u1ea5n v\u00e0o m\u00e0ng rung \u2014 ngay c\u1ea3 l\u1ef1c \u1ea5n nh\u1eb9 c\u0169ng c\u00f3 th\u1ec3 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n \u0111\u00e0n h\u1ed3i.<\/li>\n<li>D\u00f9ng kh\u00ed n\u00e9n ho\u1eb7c nit\u01a1 \u00e1p su\u1ea5t cao th\u1ed5i v\u00e0o m\u00e0ng loa \u2014 l\u1ef1c t\u00e1c \u0111\u1ed9ng c\u1ee5c b\u1ed9 c\u00f3 th\u1ec3 l\u00e0m l\u00f5m ho\u1eb7c r\u00e1ch m\u00e0ng loa.<\/li>\n<li>C\u1ea1o ho\u1eb7c s\u1eed d\u1ee5ng ch\u1ea5t m\u00e0i m\u00f2n khi v\u1ec7 sinh \u2014 m\u00e0ng ng\u0103n b\u1ecb tr\u1ea7y x\u01b0\u1edbc l\u00e0 m\u00e0ng ng\u0103n b\u1ecb h\u1ecfng.<\/li>\n<\/ul>\n<\/div>\n<ul>\n<li>Khi th\u00e1o b\u1ed9 ph\u00e1t, h\u00e3y b\u1ea3o v\u1ec7 m\u00e0ng loa b\u1eb1ng m\u1ed9t l\u1edbp v\u1ecf m\u1ec1m. Lau s\u1ea1ch nh\u1eb9 nh\u00e0ng b\u1eb1ng v\u1ea3i kh\u00f4ng x\u01a1 v\u00e0 dung m\u00f4i ph\u00f9 h\u1ee3p.<\/li>\n<\/ul>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p: C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p trong th\u1ef1c \u0111\u1ecba<\/h2>\n<h3>H\u1ecfi: B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o \u0111\u1ed9 cao c\u00f3 cho k\u1ebft qu\u1ea3 kh\u00e1c nhau \u1edf \u0111\u1ed9 cao l\u1edbn kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u \u0111o \u00e1p su\u1ea5t tham chi\u1ebfu \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n t\u1ea1i ch\u1ed7, v\u00ec v\u1eady n\u00f3 lu\u00f4n hi\u1ec3n th\u1ecb s\u1ed1 0 khi x\u1ea3 kh\u00ed \u2014 d\u00f9 \u1edf m\u1ef1c n\u01b0\u1edbc bi\u1ec3n hay \u0111\u1ed9 cao 3.000 m\u00e9t. B\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u tuy\u1ec7t \u0111\u1ed1i s\u1ebd hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb th\u1ea5p h\u01a1n \u1edf \u0111\u1ed9 cao v\u00ec \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i c\u1ee7a kh\u00ed quy\u1ec3n \u0111\u00e3 gi\u1ea3m.<\/p>\n<h3>H\u1ecfi: T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ea7u ra \u00e1p su\u1ea5t th\u1ea5p c\u1ee7a b\u1ed9 ph\u00e1t DP l\u00e0m \u0111\u01b0\u1eddng tho\u00e1t kh\u00ed ra m\u00f4i tr\u01b0\u1eddng kh\u00f4ng?<\/h3>\n<p>V\u00e2ng, nh\u01b0ng h\u00e3y hi\u1ec3u r\u00f5 nh\u1eefng g\u00ec b\u1ea1n \u0111ang \u0111o. Khi \u0111\u1ea7u ra \u00e1p su\u1ea5t th\u1ea5p h\u1edf ra m\u00f4i tr\u01b0\u1eddng, b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u s\u1ebd \u0111o \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i \u2014 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa \u00e1p su\u1ea5t qu\u00e1 tr\u00ecnh v\u00e0 \u00e1p su\u1ea5t m\u00f4i tr\u01b0\u1eddng xung quanh. N\u1ebfu \u00e1p su\u1ea5t qu\u00e1 tr\u00ecnh gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n, s\u1ef1 ch\u00eanh l\u1ec7ch s\u1ebd tr\u1edf th\u00e0nh \u00e2m v\u00e0 t\u00edn hi\u1ec7u \u0111\u1ea7u ra c\u00f3 th\u1ec3 gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 4 mA. M\u1ed9t s\u1ed1 b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 x\u1eed l\u00fd tr\u01b0\u1eddng h\u1ee3p n\u00e0y; m\u1ed9t s\u1ed1 kh\u00e1c s\u1ebd b\u1ecb b\u00e3o h\u00f2a \u1edf m\u1ee9c 4 mA. H\u00e3y b\u1ea3o v\u1ec7 \u0111\u1ea7u ra \u00e1p su\u1ea5t th\u1ea5p kh\u1ecfi m\u01b0a, m\u1ea3nh v\u1ee5n v\u00e0 c\u00f4n tr\u00f9ng.<\/p>\n<h3>H\u1ecfi: C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t c\u00f3 th\u1ec3 \u0111o ch\u00e2n kh\u00f4ng kh\u00f4ng?<\/h3>\n<p>C\u00f3, n\u1ebfu l\u1ef1a ch\u1ecdn \u0111\u00fang. C\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c \u00e1p su\u1ea5t \u00e2m nh\u1eb9 (-0,1 barG ho\u1eb7c t\u01b0\u01a1ng t\u1ef1). \u0110\u1ed1i v\u1edbi ch\u00e2n kh\u00f4ng s\u00e2u, h\u00e3y s\u1eed d\u1ee5ng b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho m\u00f4i tr\u01b0\u1eddng ch\u00e2n kh\u00f4ng. M\u00e0ng ng\u0103n ph\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u01b0\u1ee3c \u0111\u1ed9 l\u1ec7ch h\u01b0\u1edbng v\u00e0o trong, v\u00e0 ch\u1ea5t l\u1ecfng b\u00ean trong kh\u00f4ng \u0111\u01b0\u1ee3c tho\u00e1t kh\u00ed d\u01b0\u1edbi \u00e1p su\u1ea5t th\u1ea5p. Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t \u0111\u1ec1u \u0111\u1ed1i x\u1ee9ng \u2014 h\u00e3y ki\u1ec3m tra kh\u1ea3 n\u0103ng ch\u1ecbu \u00e1p su\u1ea5t \u00e2m trong b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt.<\/p>\n<h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n ghi nh\u1edb<\/h2>\n<ul>\n<li>B\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t chuy\u1ec3n \u0111\u1ed5i l\u1ef1c c\u01a1 h\u1ecdc th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n ti\u00eau chu\u1ea9n th\u00f4ng qua m\u1ed9t chu\u1ed7i: m\u00e0ng ng\u0103n \u2192 ch\u1ea5t l\u1ecfng b\u00ean trong \u2192 chip c\u1ea3m bi\u1ebfn \u2192 m\u1ea1ch \u0111i\u1ec1u ch\u1ec9nh t\u00edn hi\u1ec7u \u2192 \u0111\u1ea7u ra 4-20 mA ho\u1eb7c t\u00edn hi\u1ec7u s\u1ed1.<\/li>\n<li>C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t \u0111i\u1ec7n tr\u1edf chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c \u1ee9ng d\u1ee5ng th\u00f4ng th\u01b0\u1eddng. C\u1ea3m bi\u1ebfn \u0111i\u1ec7n dung l\u1ea1i v\u01b0\u1ee3t tr\u1ed9i trong c\u00e1c ph\u00e9p \u0111o \u1edf \u00e1p su\u1ea5t th\u1ea5p v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/li>\n<li>C\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i, \u00e1p su\u1ea5t tuy\u1ec7t \u0111\u1ed1i v\u00e0 \u00e1p su\u1ea5t ch\u00eanh l\u1ec7ch kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau. H\u00e3y x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m tham chi\u1ebfu c\u1ee7a b\u1ea1n tr\u01b0\u1edbc khi l\u1ef1a ch\u1ecdn b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u.<\/li>\n<li>M\u1ea1ch v\u00f2ng hai d\u00e2y 4-20 mA v\u1eeba l\u00e0 ngu\u1ed3n c\u1ea5p \u0111i\u1ec7n v\u1eeba l\u00e0 \u0111\u01b0\u1eddng d\u1eabn t\u00edn hi\u1ec7u. M\u1ea1ch ng\u1eaft m\u1ea1ch 4 mA cho ph\u00e9p ph\u00e1t hi\u1ec7n d\u00e2y b\u1ecb \u0111\u1ee9t.<\/li>\n<li>M\u00e0ng ng\u0103n c\u00e1ch ly l\u00e0 b\u1ed9 ph\u1eadn d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng nh\u1ea5t. C\u1ea7n b\u1ea3o v\u1ec7 n\u00f3 kh\u1ecfi s\u1ef1 \u0103n m\u00f2n, \u00e1p su\u1ea5t qu\u00e1 cao v\u00e0 h\u01b0 h\u1ecfng c\u01a1 h\u1ecdc.<\/li>\n<\/ul>\n<h2>B\u00e0i \u0111\u1ecdc li\u00ean quan<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.yunrui-controls.com\/vi\/4-20ma-signal-industrial-automation\/\">V\u00ec sao 4-20mA l\u00e0 ng\u00f4n ng\u1eef chung c\u1ee7a t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p<\/a><\/li>\n<li><a href=\"https:\/\/www.yunrui-controls.com\/vi\/rosemount-3051-pressure-transmitter-selection-guide\/\">H\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t Rosemount 3051: Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/a><\/li>\n<li><a href=\"https:\/\/www.yunrui-controls.com\/vi\/understanding-gauge-and-absolute-pressure\/\">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<\/a><\/li>\n<li><a href=\"https:\/\/www.yunrui-controls.com\/vi\/transmitter-zero-migration-guide\/\">H\u01b0\u1edbng d\u1eabn v\u1ec1 qu\u00e1 tr\u00ecnh di chuy\u1ec3n m\u00e1y ph\u00e1t s\u1ed1 0: Gi\u1ea3i th\u00edch v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa di chuy\u1ec3n t\u00edch c\u1ef1c v\u00e0 ti\u00eau c\u1ef1c<\/a><\/li>\n<li><a href=\"https:\/\/www.yunrui-controls.com\/vi\/temperature-transmitter-how-it-works\/\">C\u00e1ch c\u00e1c b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed5i nhi\u1ec7t n\u0103ng th\u00e0nh d\u1eef li\u1ec7u<\/a><\/li>\n<\/ul>\n<h2>B\u1ea1n c\u1ea7n tr\u1ee3 gi\u00fap trong vi\u1ec7c l\u1ef1a ch\u1ecdn c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t ph\u00f9 h\u1ee3p?<\/h2>\n<p>YUNRUI cung c\u1ea5p c\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t ch\u00ednh h\u00e3ng t\u1eeb... <a href=\"https:\/\/www.yunrui-controls.com\/vi\/brands\/rosemount\/\">Rosemount<\/a>, <a href=\"https:\/\/www.yunrui-controls.com\/vi\/brands\/endress-hauser\/\">Endress+Hauser<\/a>, <a href=\"https:\/\/www.yunrui-controls.com\/vi\/brands\/yokogawa\/\">Yokogawa<\/a>, <a href=\"https:\/\/www.yunrui-controls.com\/vi\/brands\/honeywell\/\">Honeywell<\/a>, v\u00e0 c\u00e1c th\u01b0\u01a1ng hi\u1ec7u h\u00e0ng \u0111\u1ea7u kh\u00e1c d\u00e0nh cho c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p ch\u1ebf bi\u1ebfn tr\u00ean to\u00e0n th\u1ebf gi\u1edbi. Cho d\u00f9 b\u1ea1n c\u1ea7n \u0111o \u00e1p su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i, tuy\u1ec7t \u0111\u1ed1i hay ch\u00eanh l\u1ec7ch, c\u00e1c k\u1ef9 s\u01b0 \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n l\u1ef1a ch\u1ecdn b\u1ed9 truy\u1ec1n t\u00edn hi\u1ec7u ph\u00f9 h\u1ee3p v\u1edbi \u0111i\u1ec1u ki\u1ec7n quy tr\u00ecnh c\u1ee7a b\u1ea1n.<\/p>\n<p>Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i t\u1ea1i <strong>sales@yunrui-controls.com<\/strong> ho\u1eb7c WhatsApp <strong>18710784030<\/strong> \u0110\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n k\u1ef9 thu\u1eadt v\u00e0 b\u00e1o gi\u00e1.<\/p>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u c\u00e1ch c\u00e1c b\u1ed9 truy\u1ec1n \u00e1p su\u1ea5t chuy\u1ec3n \u0111\u1ed5i l\u1ef1c v\u1eadt l\u00fd th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n ti\u00eau chu\u1ea9n. N\u1ed9i dung bao g\u1ed3m c\u1ea3m bi\u1ebfn \u0111i\u1ec7n tr\u1edf \u00e1p su\u1ea5t so v\u1edbi c\u1ea3m bi\u1ebfn \u0111i\u1ec7n dung, c\u00e1c lo\u1ea1i c\u1ea3m bi\u1ebfn t\u01b0\u01a1ng \u0111\u1ed1i\/tuy\u1ec7t \u0111\u1ed1i\/ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t, m\u1ea1ch v\u00f2ng 4-20mA v\u00e0 ch\u1ea9n \u0111o\u00e1n t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng.<\/p>","protected":false},"author":1,"featured_media":8621,"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":[],"class_list":["post-8619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-blogs"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ressure Transmitter Working Principle | Field Guide - YUNRUI<\/title>\n<meta name=\"description\" content=\"Learn how pressure transmitters convert process force into 4-20mA signals. Covers sensors, gauge\/absolute\/DP types, and field diagnostics.\" \/>\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\/pressure-transmitter-working-principle\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pressure Transmitter Working Principle: From Process Force to 4-20mA Signal\" \/>\n<meta property=\"og:description\" content=\"Learn how pressure transmitters convert process force into 4-20mA signals. 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