{"id":11854,"date":"2016-10-05T05:51:29","date_gmt":"2016-10-05T05:51:29","guid":{"rendered":"https:\/\/inst-tools.rdkaijf1-liquidwebsites.com\/?p=11854"},"modified":"2019-12-01T12:19:28","modified_gmt":"2019-12-01T06:49:28","slug":"rtd-accuracy","status":"publish","type":"post","link":"https:\/\/instrumentationtools.com\/rtd-accuracy\/","title":{"rendered":"What is RTD Accuracy ?"},"content":{"rendered":"<p style=\"text-align: justify;\">The practical <strong>accuracy<\/strong> of an RTD will depend on the tolerance of the <strong>RTD<\/strong>, the measurement temperature, the accuracy of the mating instrument, and the effects of the interconnecting lead wire and the installation.<\/p>\n<p style=\"text-align: justify;\">But when we speak of the accuracy of an RTD sensor, we are usually referring to its temperature deviation or tolerance grade at some reference temperature, as its \u201creal\u201d tolerance is temperature dependent.<\/p>\n<p style=\"text-align: justify;\">There are a number of international standards that define the tolerance and accuracy limits of RTDs. The most common standard used for grading Platinum RTDs is IEC 751 (1995).<\/p>\n<p style=\"text-align: justify;\">IEC 751 defines two performance classes for 100\u2126 Platinum RTDs with alpha 0.00385, Class A and Class B, as follows:<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-11855\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2016\/10\/instrumentationtools.com_rtd-accuracy.png\" alt=\"RTD Accuracy\" width=\"896\" height=\"332\" \/><\/p>\n<p style=\"text-align: justify;\">Note: The expression for Resistance Tolerance is only applicable to \u03b1=0.00385 Pt RTDs. The symbol \u201c|T|\u201d in the table expressions refers to the absolute value of the sensor temperature.<\/p>\n<p style=\"text-align: justify;\">Other standards such as DIN 43760, BS-1904, BS EN60751 (1996), and JIS C1604 generally match the IEC 751. While IEC 751 only addresses 100\u2126 Platinum RTDs with alpha 0.00385, its temperature tolerance and accuracy requirements are often applied to other platinum RTD types.<\/p>\n<p style=\"text-align: justify;\">For example, the JIS C1604 standard also adds recognition of the 0.003916 alpha type and applies the same tolerance standards. Performance classes A &amp; B are also referred to as DIN A and DIN B with respect to the DIN 43760 standard. Note that Class C and Class D designations are sometimes used and each Class doubles the prior tolerance level.<\/p>\n<p style=\"text-align: justify;\">DIN Standard (DIN 43760) similarly recognizes three different temperature deviation classes as follows:<\/p>\n<p style=\"text-align: justify;\"><strong>DIN Class A: \u00b1(0.15 + 0.002*|T|) \u00a0\u00b0C \u00a0 \u00a0 \u00a0 (Matches IEC 751 Class A)<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>DIN Class B: \u00b1(0.30 + 0.005*|T|) \u00a0\u00b0C \u00a0 \u00a0 \u00a0 (Matches IEC 751 Class B)<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>DIN Class C: \u00b1(1.20 + 0.005*|T|) \u00a0\u00b0C<\/strong><\/p>\n<p style=\"text-align: justify;\">In the US, ASTM Specification E1137 is also referenced and defines two RTD temperature tolerance grades, A and B, as follows:<\/p>\n<p style=\"text-align: justify;\"><strong>Grade A: \u00b1(0.13 + 0.0017*|T|) \u00a0\u00b0C<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Grade B: \u00b1(0.25 + 0.0042*|T|) \u00a0\u00b0C<\/strong><\/p>\n<p style=\"text-align: justify;\">By IEC 751, the accuracy or tolerance grade of an RTD element is a function of its resistance tolerance and its temperature deviation.<\/p>\n<p style=\"text-align: justify;\">In accordance with DIN 43760 and IEC 751, its class designation will be denoted by its resistance tolerance and temperature deviation at its calibration temperature (typically 0\u00b0C) and base resistance R0 (typically 100\u2126), and will be divided into two major classes as follows:<\/p>\n<p style=\"text-align: justify;\">Temp &amp; Resistance Tolerance vs Temperature for Platinum RTDs Per IEC 751 (1995) &amp; BS EN60751 (1996)<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-11856\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2016\/10\/instrumentationtools.com_rtd-class-a-class-b-tolerance.png\" alt=\"RTD Class A &amp; Class B Tolerance\" width=\"1014\" height=\"427\" \/><\/p>\n<p style=\"text-align: justify;\">Note: The tolerances provided above are assumed to apply to three and four wire Platinum sensor connections, as two wire RTD sensor connections will require special consideration due to the negative effects of lead resistance, as two wire sensors cannot achieve these tolerances without the benefit of lead compensation provided by three and four wire sensors.<\/p>\n<p style=\"text-align: justify;\">Most RTD sensors will use the Class A or Class B designation as set forth in International Standard IEC 751 and will be denoted simply by their temperature deviations at their reference temperature: Class A, with a tolerance of \u00b10.15\u00b0C at 0\u00b0C; or Class B, with a tolerance of \u00b10.3\u00b0C at 0\u00b0C. But there are additional class designations such as \u201c1\/10 DIN\u201d and \u201c1\/3 DIN\u201d used to denote sensors of greater precision and these will have a tolerance of 1\/10 or 1\/3 of the Class B specification at 0\u00b0C, respectively.<\/p>\n<p style=\"text-align: justify;\">While the \u201caccuracy\u201d of an RTD element is usually denoted by its initial element accuracy measured at one point, usually 0\u00b0C (32\u00b0F), it does vary with temperature. Further, it is also dependent on the tolerance of the base resistance at the calibration temperature of the element.<\/p>\n<p style=\"text-align: justify;\">So the effective tolerance of an RTD sensor is really a combination of both the base resistance tolerance (the resistance tolerance at the calibration temperature), and the Temperature Coefficient of Resistance tolerance (TCR or tolerance of the characteristic slope).<\/p>\n<p style=\"text-align: justify;\">For most RTDs, the calibration temperature is 0\u00b0C, and it is understood that any temperature above or below this temperature will have a wider tolerance band and lower accuracy.<\/p>\n<p style=\"text-align: justify;\"><strong>Also Read : <span style=\"color: #ff0000;\"><a style=\"color: #ff0000;\" href=\"https:\/\/instrumentationtools.com\/how-to-calculate-tolerance-of-rtd-sensor\/\" target=\"_blank\" rel=\"noopener noreferrer\">How to Calculate RTD Tolerance<\/a><\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Article Source : Acromag<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The practical accuracy of an RTD will depend on the tolerance of the RTD, the measurement temperature, the accuracy of the mating instrument, and the effects of the interconnecting lead wire and the installation. But when we speak of the accuracy of an RTD sensor, we are usually referring to its temperature deviation or tolerance [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11855,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","footnotes":""},"categories":[26],"tags":[21133,21132,21131,21125,8617,8631,528,8686,3649,3650,21129,21127,21126,21130,21128,489,4267,3648],"class_list":{"0":"post-11854","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-temperature-measurement","8":"tag-bs-en60751","9":"tag-bs-1904","10":"tag-din-43760","11":"tag-iec-751","12":"tag-resistance-temperature-detector","13":"tag-resistance-temperature-detector-accuracy","14":"tag-rtd","15":"tag-rtd-accuracy","16":"tag-rtd-class-a","17":"tag-rtd-class-b","18":"tag-rtd-element-accuracy","19":"tag-rtd-element-standard","20":"tag-rtd-iec-751","21":"tag-rtd-sensor-accuracy","22":"tag-rtd-sensor-standard","23":"tag-rtd-standards","24":"tag-rtd-theory","25":"tag-rtd-tolerance"},"yoast_head":"<!-- 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