{"id":3310,"date":"2023-05-02T06:29:55","date_gmt":"2023-05-02T06:29:55","guid":{"rendered":"https:\/\/thermibel.be\/faq\/wat-is-de-alfa-coefficient-%ce%b1\/"},"modified":"2023-06-29T07:03:14","modified_gmt":"2023-06-29T07:03:14","slug":"wat-is-de-alfa-coefficient-%ce%b1","status":"publish","type":"faq","link":"https:\/\/thermibel.be\/nl\/faq\/wat-is-de-alfa-coefficient-%ce%b1\/","title":{"rendered":"Wat is de alfa-co\u00ebffici\u00ebnt (\u03b1)?"},"content":{"rendered":"\n

De gestandaardiseerde temperatuurco\u00ebffici\u00ebnt DIN 43760 van de platinadraad bedraagt: \u03b1 = 0.00385. Voor een weerstand van 100 ohm bij 0 \u00b0C, stemt dit overeen met + 0,385 ohm per \u00b0C (Europese \u03b1). \u03b1 is dus de gemiddelde helling van 0\u00b0C tot 100\u00b0C<\/strong><\/strong> $$ \\alpha = \\frac{{{R_{100}} – {R_0}}}{{ {R_0} \\times 100^\\circ C.}} $$. Er bestaat een breed gamma aan RTD met elk hun eigen \u03b1-co\u00ebffici\u00ebnten en ohm-waarden bij 0\u00b0C die worden gepreciseerd door hun technische kenmerken. De RTD die het vaakst wordt gebruikt is de RTD met een \u03b1-co\u00ebffici\u00ebnt van 0.00385 en een ohm-waarde bij 0\u00b0C van 100 \u03a9. Deze RTD wordt Pt100 genoemd.
<\/p>\n\n\n\n

Waarden van enkele RTD<\/strong><\/strong><\/td><\/tr>
R bij 0\u00b0C
(\u03a9)<\/strong><\/strong><\/td>		\u03b1
(\u03a9\/\u03a9\/\u00b0C)<\/td>		Gemiddelde gevoeligheid
(\u03a9\/\u00b0C)<\/td><\/tr>
25,5<\/strong><\/strong><\/td>0.00392<\/td>0,1<\/td><\/tr>
100<\/strong><\/strong><\/td>0.00392<\/td>0.392<\/td><\/tr>
100<\/strong><\/strong><\/td>0.00391<\/td>0.391<\/td><\/tr>
100<\/strong><\/strong><\/td>0.00385<\/td>0.385<\/td><\/tr>
200<\/strong><\/strong><\/td>0.00385<\/td>0.770<\/td><\/tr>
470<\/strong><\/strong><\/td>0.00392<\/td>1.845<\/td><\/tr>
500<\/strong><\/strong><\/td>0.00392<\/td>1.963<\/td><\/tr>
500<\/strong><\/strong><\/td>0.00391<\/td>1.955<\/td><\/tr>
500<\/strong><\/strong><\/td>0.00385<\/td>1.925<\/td><\/tr>
1000<\/strong><\/strong><\/td>0.00385<\/td>3.850<\/td><\/tr>
1000<\/strong><\/strong><\/td>0.00375<\/td>3.750<\/td><\/tr>
10000<\/strong><\/strong><\/td>0.00385<\/td>38,50<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Internationale normen DIN 43760 (IEC 751, BS-1904, JIS C1604)<\/td><\/tr>
Parameter<\/strong><\/strong><\/td>Klasse A<\/td>Klasse B<\/td><\/tr>
R0<\/sub><\/strong><\/strong><\/td>100\u03a9 \u00b10,06%<\/td>100\u03a9 \u00b10,12%<\/td><\/tr>
Alfa, \u03b1<\/strong><\/strong><\/td>0,00385 \u00b10,000063<\/td>0,00385 \u00b10,000063<\/td><\/tr>
Bereik<\/strong><\/strong><\/td>-200\u00b0C tot 650\u00b0C<\/td>-200\u00b0C tot 850\u00b0C<\/td><\/tr>
Res, RT<\/sub><\/strong><\/strong><\/td>\u00b1(.06+.0008|T|-2e-7<\/sup>T2<\/sup>)<\/td>\u00b1(.12+.0019|T|-6e-7<\/sup>T2<\/sup>)<\/td><\/tr>
Temp, T<\/strong><\/strong><\/td>\u00b1(0.3+0.002|T|)\u00b0C<\/td>\u00b1(0.3+0.005|T|)\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"featured_media":0,"template":"","format":"standard","class_list":["post-3310","faq","type-faq","status-publish","format-standard","hentry"],"acf":[],"aioseo_notices":[],"yoast_head":"\nWat is de alfa-co\u00ebffici\u00ebnt (\u03b1)? - 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-alfa-coefficient-%ce%b1\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Wat is de alfa-co\u00ebffici\u00ebnt (\u03b1)? - Thermibel\" \/>\n<meta property=\"og:description\" content=\"De gestandaardiseerde temperatuurco\u00ebffici\u00ebnt DIN 43760 van de platinadraad bedraagt: \u03b1 = 0.00385. Voor een weerstand van 100 ohm bij 0 \u00b0C, stemt dit overeen met + 0,385 ohm per \u00b0C (Europese \u03b1). \u03b1 is dus de gemiddelde helling van 0\u00b0C tot 100\u00b0C $$ alpha = frac{{{R_{100}} – {R_0}}}{{ {R_0} times 100^circ C.}} $$. 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Voor een weerstand van 100 ohm bij 0 \u00b0C, stemt dit overeen met + 0,385 ohm per \u00b0C (Europese \u03b1). \u03b1 is dus de gemiddelde helling van 0\u00b0C tot 100\u00b0C $$ alpha = frac{{{R_{100}} – {R_0}}}{{ {R_0} times 100^circ C.}} $$. 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