{"id":9519,"date":"2023-11-01T18:07:21","date_gmt":"2023-11-01T18:07:21","guid":{"rendered":"https:\/\/volleyballvnl.com\/?p=9519"},"modified":"2023-11-01T18:07:21","modified_gmt":"2023-11-01T18:07:21","slug":"comparative-calibration-vs-fixed-point-calibration-4","status":"publish","type":"post","link":"https:\/\/volleyballvnl.com\/?p=9519","title":{"rendered":"Comparative calibration vs. fixed point calibration"},"content":{"rendered":"\n<p>In temperature calibration technology, there are two ways of calibration ? the comparative calibration and the fixed point calibration. The method of calibration to be utilized will undoubtedly be defined through the demands on the accuracy and the sort of test instrument.  <a href=\"http:\/\/gourmetgatheringspro.xyz\">\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e21\u0e37\u0e2d\u0e27\u0e31\u0e14pressure<\/a>  represents probably the most widely used method of calibration.<br\/>So how do the comparative calibration and fixed point calibration methods differ? Using the example of calibrating a resistance thermometer, this website article explains both methods and therefore tries to convey to the reader an improved understanding.<br\/>The comparative calibration<br\/>Because the name already implies, this sort of calibration is completed by comparing the resistance thermometer being tested with a higher-quality reference thermometer. The higher-quality reference should thus exhibit an accuracy of 3 or 4 times greater than the thermometer being tested. Both thermometers are put into a single homogenous temperature source. When placing the thermometers, care ought to be taken to ensure a little distance between them and that the sensitive points (meaning the measuring points) are in exactly the same height. As a temperature source, liquid baths or dry-well calibrators are usually used.<br\/>The fixed point calibration<br\/>The fixed point calibration, as opposed to the comparative calibration, is carried out contrary to the defined triple, freezing and melting points from the International Temperature Scale of 1990 (ITS-90). The fixed points define temperatures of which the physical state of substances alter. The main fixed point of the ITS-90 is the triple point of water. At a temperature of 0.010 \u00ef\u00bf\u00bdC the physical state of high-purity water is continually changing between steam, ice and liquid water. The levels of the physical states always remain in proportion. Generally, only national laboratories or laboratories qualifying for very small measurement uncertainties work with these fixed-point cells, as these are costly and specialised limited to this application. Highly stable PRTs (platinum resistance thermometers), which will be used as reference thermometers, are calibrated utilizing the fixed point method. The reference sensor is inserted into a closed, or also open fixed-point cell, which holds the temperature constant over an extended period.<br\/>Example: fixed points from -189 to 660 \u00ef\u00bf\u00bdC in accordance with ITS-90:<br\/>Fixed point<br\/>Temperature<br\/>Triple point of argon<br\/>-189,3442 \u00ef\u00bf\u00bdC<br\/>Triple point of mercury<br\/>-38,8344 \u00ef\u00bf\u00bdC<br\/>Triple point of water<br\/>0,01 \u00ef\u00bf\u00bdC<br\/>Melting point of gallium<br\/>29,7646 \u00ef\u00bf\u00bdC<br\/>Freezing point of indium<br\/>156,5985 \u00ef\u00bf\u00bdC<br\/>Freezing point of tin<br\/>231,928 \u00ef\u00bf\u00bdC<br\/>Freezing point of zinc<br\/>419,527 \u00ef\u00bf\u00bdC<br\/>Freezing point of aluminium<br\/>660,323 \u00ef\u00bf\u00bdC<br\/>Note<br\/>More info on our Services ?Temperature calibration? can be found on the WIKA website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In temperature calibration technology, there are two ways of calibration ? the comparative calibration and the fixed point calibration. The method of calibration to be utilized will undoubtedly be defined through the demands on the accuracy and the sort of test instrument. \u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e21\u0e37\u0e2d\u0e27\u0e31\u0e14pressure represents probably the most widely used method of calibration.So how do the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9519","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/9519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9519"}],"version-history":[{"count":1,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/9519\/revisions"}],"predecessor-version":[{"id":9520,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/9519\/revisions\/9520"}],"wp:attachment":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}