{"id":3313,"date":"2023-05-02T06:28:41","date_gmt":"2023-05-02T06:28:41","guid":{"rendered":"https:\/\/thermibel.be\/faq\/wat-is-de-cvd-vergelijking\/"},"modified":"2023-06-29T08:53:35","modified_gmt":"2023-06-29T08:53:35","slug":"wat-is-de-cvd-vergelijking","status":"publish","type":"faq","link":"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-cvd-vergelijking\/","title":{"rendered":"Wat is de CVD-vergelijking?"},"content":{"rendered":"\n
De sensoren van de Pt100 (platina 100 \u03a9 (PRTD)) zijn meer lineair dan de thermokoppels:<\/p>\n\n\n
\n
<\/figure>\n<\/div>\n\n\n
Figuur 6 Evolutie van de lineariteitsco\u00ebffici\u00ebnt van een TK type S en een Pt100<\/p>\n\n\n\n
Het verband tussen de temperatuur en de ohm-waarde van de RTD wordt berekend door Callendar en vervolgens, in een later stadium, aangescherpt door Van Dusen; daarom wordt deze vergelijking de vergelijking van Callendar-Van Dusen (CVD) genoemd:<\/strong> $$ {R_T} = {R_0} + {R_0}\\alpha \\left[ {T – \\delta \\left( {\\frac{T}{{100}} – 1} \\right)\\left( {\\frac{T}{{100}}} \\right) – \\beta \\left( {\\frac{T}{{100}} – 1} \\right)\\left( {\\frac{{{T^3}}}{{100}}} \\right)} \\right] $$<\/p>\n\n\n\n
Met RT = weerstand bij T\u00b0C, R0 = weerstand bij 0\u00b0C, \u03b1 = temperatuurco\u00ebffici\u00ebnt bij 0\u00b0C in \u03a9\/\u03a9\/\u00b0C, \u03b4 = lineariteitsco\u00ebffici\u00ebnt, \u03b2 = tweede lineariteitsco\u00ebffici\u00ebnt voor de negatieve temperatuurwaarden (\u03b2 = 0 voor T > 0\u00b0C).<\/p>\n\n\n\n
Deze vergelijking werd omgezet, zodat deze gemakkelijker kan worden gebruikt met co\u00ebffici\u00ebnten A, B en C, gegeven door de norm DIN 43760 (IEC 751) en de technische fiches van de componenten: $$ {R_T} = {R_0}\\left[ {1 + AT + B{T^2} – C\\left( {T – 100} \\right){T^3}} \\right] $$<\/p>\n\n\n\n
C=0 voor T>0\u00b0C.<\/p>\n\n\n\n
Coefficients pour diff\u00e9rents \u03b1<\/td><\/tr>
Deze drie \u03b1-waarden vertonen drie belangrijke kenmerken voor de RTD<\/p>\n\n\n\n
\n
0,003850 \u03a9\/\u03a9\/\u00b0C: Standaardisering DIN 43760, IEC 751 en andere internationale specificaties, Europese Standaard genoemd.<\/li>\n\n\n\n
0,003926 \u03a9\/\u03a9\/\u00b0C: Vereist voor 99,999% puur platina of meer, Amerikaanse Standaard genoemd.<\/li>\n\n\n\n
0,3911 \u03a9\/\u03a9\/\u00b0C: Vaak Amerikaanse Industri\u00eble Standaard genoemd.<\/li>\n<\/ul>\n","protected":false},"featured_media":0,"template":"","format":"standard","class_list":["post-3313","faq","type-faq","status-publish","format-standard","hentry"],"acf":[],"aioseo_notices":[],"yoast_head":"\nWat is de CVD-vergelijking? - Thermibel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-cvd-vergelijking\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Wat is de CVD-vergelijking? - Thermibel\" \/>\n<meta property=\"og:description\" content=\"De sensoren van de Pt100 (platina 100 \u03a9 (PRTD)) zijn meer lineair dan de thermokoppels: Figuur 6 Evolutie van de lineariteitsco\u00ebffici\u00ebnt van een TK type S en een Pt100 Het verband tussen de temperatuur en de ohm-waarde van de RTD wordt berekend door Callendar en vervolgens, in een later stadium, aangescherpt door Van Dusen; daarom […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-cvd-vergelijking\/\" \/>\n<meta property=\"og:site_name\" content=\"Thermibel\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-29T08:53:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-24.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Geschatte leestijd\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-cvd-vergelijking\/\",\"url\":\"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-cvd-vergelijking\/\",\"name\":\"Wat is de CVD-vergelijking? 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![\"\"](\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-24.png\")
<\/figure>\n<\/div>\n\n\n