{"id":33,"date":"2026-10-23T10:00:00","date_gmt":"2026-10-23T06:30:00","guid":{"rendered":"https:\/\/sanatiblog.ir\/blog\/thermocouple-type-k-or-pt100\/"},"modified":"2026-10-23T10:00:00","modified_gmt":"2026-10-23T06:30:00","slug":"thermocouple-type-k-or-pt100","status":"publish","type":"post","link":"https:\/\/sanatiblog.ir\/fa\/blog\/thermocouple-type-k-or-pt100\/","title":{"rendered":"\u062a\u0631\u0645\u0648\u06a9\u0648\u067e\u0644 K \u06cc\u0627 PT100\u061f"},"content":{"rendered":"<p>Both measure temperature. They are good at different things.<\/p>\n<h2>Thermocouple type K<\/h2>\n<p>Two different metal wires joined at the tip. Cheap, tough and fast, and it works from about \u2212200 to about 1,250 \u00b0C. The catch is accuracy: a standard type K is good to about \u00b12.2 \u00b0C, or 0.75% of the reading at high temperatures. Use type K extension cable all the way to the controller, not ordinary copper wire.<\/p>\n<h2>PT100<\/h2>\n<p>A small platinum resistor: 100 ohms at 0 \u00b0C. It is more accurate (a class B PT100 is about \u00b10.3 \u00b0C at 0 \u00b0C) and stays accurate for years, but most PT100s only go up to about 400 to 600 \u00b0C, and they cost more. Use the 3-wire type, so the length of the cable does not change the reading.<\/p>\n<h2>The simple rule<\/h2>\n<ul>\n<li><strong>Hotter than about 500 \u00b0C<\/strong> (furnaces, kilns, exhaust): thermocouple.<\/li>\n<li><strong>Below that, and you care about one or two degrees<\/strong> (food, plastics, labs, HVAC): PT100.<\/li>\n<li><strong>Below that, and a few degrees do not matter:<\/strong> either; type K is cheaper.<\/li>\n<\/ul>\n<p>Whatever you choose, tell the seller the probe length, the diameter and the thread you need (for example M8 or 1\/4 inch), and whether it needs a protective sleeve (thermowell).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u06a9\u062f\u0627\u0645 \u0633\u0646\u0633\u0648\u0631 \u062f\u0645\u0627 \u0628\u0647 \u06a9\u0627\u0631 \u0634\u0645\u0627 \u0645\u06cc\u200c\u062e\u0648\u0631\u062f\u060c \u0648 \u06cc\u06a9 \u0642\u0627\u0646\u0648\u0646 \u0633\u0627\u062f\u0647 \u0628\u0631\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628.<\/p>\n","protected":false},"author":0,"featured_media":36,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-33","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/33","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/comments?post=33"}],"version-history":[{"count":0,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/33\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media\/36"}],"wp:attachment":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media?parent=33"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/categories?post=33"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/tags?post=33"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}