{"id":388,"date":"2022-11-23T12:37:44","date_gmt":"2022-11-23T12:37:44","guid":{"rendered":"https:\/\/vnexpress.link\/?p=388"},"modified":"2022-11-23T12:37:46","modified_gmt":"2022-11-23T12:37:46","slug":"diem-manh-va-han-che-cua-cam-bien-nhiet-pt100","status":"publish","type":"post","link":"https:\/\/vnexpress.link\/index.php\/2022\/11\/23\/diem-manh-va-han-che-cua-cam-bien-nhiet-pt100\/","title":{"rendered":"\u0110i\u1ec3m m\u1ea1nh v\u00e0 H\u1ea1n ch\u1ebf c\u1ee7a c\u1ea3m bi\u1ebfn nhi\u1ec7t PT100"},"content":{"rendered":"\n

Thi\u1ebft b\u1ecb n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111o t\u00edn hi\u1ec7u nhi\u1ec7t \u0111\u1ed9 \u1edf m\u1ed9t khu v\u1ef1c nh\u1ea5t \u0111\u1ecbnh v\u00e0 t\u00f9y theo v\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t d\u1ea3i \u0111o m\u00e0 ta s\u1ebd c\u00f3 th\u1ec3 d\u00f9ng c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 d\u1ea1ng \u0111\u1ea7u d\u00f2 hay l\u00e0 d\u1ea1ng d\u00e2y. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i hy v\u1ecdng c\u00e1c th\u00f4ng tin s\u1ebd h\u1eefu \u00edch \u0111\u1ed1i v\u1edbi b\u1ea1n v\u1ec1 c\u1ea3m bi\u1ebfn nhi\u1ec7t PT100<\/p>\n\n\n\n

1. T\u1ea1i sao l\u1ea1i g\u1ecdi l\u00e0 PT100?<\/h2>\n\n\n\n

\u0110\u00e2y \u0111\u01b0\u1ee3c xem nh\u01b0 l\u00e0 chu\u1ea9n c\u1ee7a c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 lo\u1ea1i rtd v\u00ec ch\u00fang ta s\u1ebd th\u01b0\u1eddng th\u1ea5y lo\u1ea1i n\u00e0y nh\u1ea5t tr\u00ean th\u1ecb tr\u01b0\u1eddng. Pt100 v\u1edbi Pt l\u00e0 ch\u1eef vi\u1ebft t\u1eaft c\u1ee7a platinum, c\u00f2n 100 l\u00e0 gi\u00e1 tr\u1ecb 100 ohm t\u1ea1i 0oC . <\/p>\n\n\n\n

T\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1eady v\u1edbi lo\u1ea1i c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 Ni100 th\u00ec Ni l\u00e0 ch\u1eef vi\u1ebft t\u1eaft c\u1ee7a Nickel v\u00e0 100 l\u00e0 gi\u00e1 tr\u1ecb 100 ohm t\u1ea1i 0oC . Ngo\u00e0i ra ch\u00fang ta c\u00f2n c\u00f3 Pt500 , PT1000 , Ni500 , Ni1000 \u2026<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

C\u1ea3m bi\u1ebfn n\u00e0y c\u00f3 th\u1ec3 \u0111o \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 l\u00ean t\u1edbi 650oC v\u1edbi thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb kim lo\u1ea1i platinum t\u1ee9c l\u00e0 b\u1ea1ch kim, m\u1ed9t lo\u1ea1i kim lo\u1ea1i qu\u00fd c\u00f3 s\u1ee9c ch\u1ecbu nhi\u1ec7t cao. T\u00f9y v\u00e0o m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 m\u00e0 l\u01b0\u1ee3ng platinum trong m\u1ed7i lo\u1ea1i c\u1ea3m bi\u1ebfn kh\u00e1c nhau.<\/p>\n\n\n\n

2. T\u00edn hi\u1ec7u output c\u1ee7a c\u1ea3m bi\u1ebfn pt100 <\/h2>\n\n\n\n

C\u1ea3m bi\u1ebfn pt100 c\u00f3 t\u00edn hi\u1ec7u output m\u1eb7c \u0111\u1ecbnh l\u00e0 \u0111i\u1ec7n tr\u1edf (ohm). Tuy nhi\u00ean \u0111\u1ec3 \u0111\u01b0a t\u00edn hi\u1ec7u c\u1ee7a c\u1ea3m bi\u1ebfn pt100 v\u1ec1 PLC \u0111\u1ec3 x\u1eed l\u00fd, ta c\u1ea7n ph\u1ea3i chuy\u1ec3n t\u00edn hi\u1ec7u \u0111i\u1ec7n tr\u1edf n\u00e0y ra th\u00e0nh t\u00edn hi\u1ec7u 4-20mA \u0111\u1ec3 PLC c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c. <\/p>\n\n\n\n

V\u00e0 \u0111\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c vi\u1ec7c n\u00e0y, ta c\u1ea7n d\u00f9ng th\u00eam 1 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i g\u1eafn tr\u00ean \u0111\u1ea7u d\u00f2 nhi\u1ec7t (\u0111\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn pt100 d\u1ea1ng \u0111\u1ea7u d\u00f2) ho\u1eb7c g\u1eafn ri\u00eang (\u0111\u1ed1i v\u1edbi lo\u1ea1i d\u00e2y d\u00f2 nhi\u1ec7t).<\/p>\n\n\n\n

3. C\u00e1c lo\u1ea1i c\u1ea3m bi\u1ebfn pt100 – \u0110i\u1ec3m m\u1ea1nh v\u00e0 H\u1ea1n ch\u1ebf c\u1ee7a PT100<\/h2>\n\n\n\n

Hi\u1ec7n nay \u0111ang c\u00f3 2 lo\u1ea1i: Lo\u1ea1i \u0111\u1ea7u d\u00f2 v\u00e0 lo\u1ea1i d\u00e2y<\/p>\n\n\n\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t pt100 d\u1ea1ng \u0111\u1ea7u d\u00f2<\/h3>\n\n\n\n

Thi\u1ebft k\u1ebf l\u00e0 1 que d\u00e0i ch\u1eafc ch\u1eafn \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng Inox g\u1eafn v\u1edbi 1 \u0111\u1ea7u d\u00f2, lo\u1ea1i n\u00e0y th\u00edch h\u1ee3p \u0111\u1ec3 \u0111o trong nh\u1eefng n\u01a1i c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao. v\u1edbi d\u1ea3i \u0111o nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 l\u00ean \u0111\u1ebfn 650oC<\/p>\n\n\n\n

M\u1ed9t \u01b0u \u0111i\u1ec3m n\u1eefa l\u00e0 thi\u1ebft k\u1ebf ch\u1eafc ch\u1eafn c\u00f9ng v\u1edbi v\u1ecf b\u1ecdc b\u00ean ngo\u00e0i b\u1eb1ng Inox; t\u0103ng kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u01b0\u1ee3c m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n\n\n\n

\u0110i\u1ec3m m\u1ea1nh<\/strong><\/td>– \u0110i\u1ec3m h\u1ea1n ch\u1ebfThi\u1ebft k\u1ebf ch\u1eafc ch\u1eafn v\u1edbi l\u1edbp v\u1ecf ngo\u00e0i c\u1ea3m bi\u1ebfn \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng Inox.
– Thi\u1ebft k\u1ebf ch\u1eafc ch\u1eafn v\u1edbi l\u1edbp v\u1ecf ngo\u00e0i c\u1ea3m bi\u1ebfn \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng Inox.
– C\u00f3 ch\u1ed7 \u0111\u1ec3 g\u1eafn b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u t\u1eeb t\u00edn hi\u1ec7u nhi\u1ec7t \u0111\u1ed9 sang 4-20mA.<\/td><\/tr>
\u0110i\u1ec3m h\u1ea1n ch\u1ebf<\/strong><\/td>C\u00f3 l\u1ebd nh\u01b0\u1ee3c \u0111i\u1ec3m duy nh\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb ch\u00ednh l\u00e0 thi\u1ebft k\u1ebf kh\u00e1 l\u1edbn, kh\u00f4ng th\u00edch h\u1ee3p \u0111\u1ec3 \u0111o trong nh\u1eefng v\u1ecb tr\u00ed nh\u1ecf. Ngo\u00e0i ra gi\u00e1 c\u1ee7a c\u1ea3m bi\u1ebfn d\u1ea1ng \u0111\u1ea7u d\u00f2 c\u0169ng cao h\u01a1n kh\u00e1 nhi\u1ec1u so v\u1edbi lo\u1ea1i d\u00e2y.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 pt100 d\u1ea1ng d\u00e2y<\/h3>\n\n\n\n

C\u00f3 thi\u1ebft k\u1ebf d\u1ea1ng d\u00e2y; 1 \u0111\u1ea7u c\u00f3 \u0111\u00ednh k\u00e8m 1 que c\u1ea3m bi\u1ebfn \u0111\u1ec3 ch\u1ecdc v\u00e0o ch\u1ed7 c\u1ea7n \u0111o; 1 \u0111\u1ea7u s\u1ebd c\u00f3 c\u00e1c d\u00e2y k\u1ebft n\u1ed1i.<\/p>\n\n\n\n

V\u1edbi \u0111\u1eb7c t\u00ednh d\u1ec5 u\u1ed1n cong, kh\u00f4ng t\u1ed1n nhi\u1ec1u di\u1ec7n t\u00edch khi l\u1eafp \u0111\u1eb7t; c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 pt100 d\u1ea1ng d\u00e2y d\u00f2 th\u00edch h\u1ee3p d\u00f9ng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u1ea7n \u0111o nh\u1eefng n\u01a1i c\u00f3 di\u1ec7n t\u00edch ti\u1ebfp x\u00fac nh\u1ecf m\u00e0 lo\u1ea1i \u0111\u1ea7u d\u00f2 kh\u00f4ng \u0111\u01b0a v\u00e0o \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n

\u0110i\u1ec3m m\u1ea1nh<\/strong><\/td>K\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn, thi\u1ebft k\u1ebf c\u00f3 th\u1ec3 u\u1ed1n cong \u0111\u01b0\u1ee3c, th\u00edch h\u1ee3p \u0111o \u1edf nh\u1eefng v\u1ecb tr\u00ed c\u00f3 di\u1ec7n t\u00edch nh\u1ecf.<\/td><\/tr>
\u0110i\u1ec3m h\u1ea1n ch\u1ebf<\/strong><\/td>Ch\u1ec9 \u0111o \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 t\u1ed1i \u0111a l\u00e0 200oC.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

4. C\u00e1ch \u0111\u1ea5u d\u00e2y c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 PT100 <\/h2>\n\n\n\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 pt100 2 d\u00e2y<\/h3>\n\n\n\n

Th\u00ec \u0111\u1ed1i v\u1edbi lo\u1ea1i 2 d\u00e2y \u0111\u01a1n gi\u1ea3n ta ch\u1ec9 c\u1ea7n \u0111\u1ea5u tr\u1ef1c ti\u1ebfp 2 d\u00e2y c\u1ee7a pt100 v\u00e0o 2 ch\u00e2n 3 v\u00e0 6<\/p>\n\n\n\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 PT100 3 d\u00e2y<\/a><\/h3>\n\n\n\n

\u0110\u1ed1i v\u1edbi lo\u1ea1i 3 d\u00e2y th\u00ec ta \u0111\u1ea5u 2 d\u00e2y c\u00f9ng m\u00e0u (th\u00f4ng th\u01b0\u1eddng l\u00e0 m\u00e0u tr\u1eafng) v\u00e0o ch\u00e2n 3 v\u00e0 4. D\u00e2y c\u00f2n l\u1ea1i \u0111\u1ea5u v\u00e0o ch\u00e2n 6.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 pt100 4 d\u00e2y<\/h3>\n\n\n\n

Hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 pt100 \u0111\u00f4i. B\u1edfi v\u00ec th\u1ef1c ch\u1ea5t c\u1ee7a lo\u1ea1i c\u1ea3m bi\u1ebfn n\u00e0y l\u00e0 do 2 c\u00e2y pt100 g\u1ed9p l\u1ea1i v\u1edbi nhau. V\u1ec1 c\u00e1ch \u0111\u1ea5u d\u00e2y th\u00ec ta ch\u1ec9 c\u1ea7n \u0111\u1ea5u tr\u1ef1c ti\u1ebfp v\u00e0o 4 ch\u00e2n nh\u01b0 h\u00ecnh l\u00e0 \u0111\u01b0\u1ee3c.<\/p>\n","protected":false},"excerpt":{"rendered":"

Thi\u1ebft b\u1ecb n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111o t\u00edn hi\u1ec7u nhi\u1ec7t \u0111\u1ed9 \u1edf m\u1ed9t khu v\u1ef1c nh\u1ea5t \u0111\u1ecbnh v\u00e0 t\u00f9y theo v\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t d\u1ea3i \u0111o m\u00e0 ta s\u1ebd c\u00f3 th\u1ec3 d\u00f9ng c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 d\u1ea1ng \u0111\u1ea7u d\u00f2 hay l\u00e0 d\u1ea1ng d\u00e2y. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i hy v\u1ecdng c\u00e1c th\u00f4ng tin s\u1ebd … Ti\u1ebfp t\u1ee5c \u0111\u1ecdc \u0110i\u1ec3m m\u1ea1nh v\u00e0 H\u1ea1n ch\u1ebf c\u1ee7a c\u1ea3m bi\u1ebfn nhi\u1ec7t PT100<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":392,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[15],"tags":[],"class_list":["post-388","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cong-nghe"],"_links":{"self":[{"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/posts\/388","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/comments?post=388"}],"version-history":[{"count":1,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/posts\/388\/revisions"}],"predecessor-version":[{"id":393,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/posts\/388\/revisions\/393"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/media\/392"}],"wp:attachment":[{"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/media?parent=388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/categories?post=388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vnexpress.link\/index.php\/wp-json\/wp\/v2\/tags?post=388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}