{"id":2959,"date":"2019-05-17T17:41:35","date_gmt":"2019-05-18T00:41:35","guid":{"rendered":""},"modified":"2023-07-06T11:53:23","modified_gmt":"2023-07-06T18:53:23","slug":"2959","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/2959","title":{"rendered":"How is the temperature compensation calculated on my conductivity probe (CON-BTA)?"},"content":{"rendered":"<p>The <a href=\"\/product\/conductivity-probe\/\">Conductivity Probe<\/a> (<nobr>CON-BTA<\/nobr>) is automatically temperature compensated between temperatures of 5 and 35\u00b0C. Note that the temperature of a solution is being read by a thermistor that extends into the space between the graphite electrodes. Readings are automatically referenced to a conductivity value at 25\u00b0C; therefore, the Conductivity Probe will give the same conductivity reading in a solution that is at 15\u00b0C as it would if the same solution were warmed to 25\u00b0C. This means you can calibrate your probe in the lab, and then use these stored calibrations to take readings in colder (or warmer) water in a lake or stream. If the probe were not temperature compensated, you would notice a change in the conductivity reading as temperature changed, even though the actual ion concentration did not change. If the solution temperature is higher than 35\u00b0C. The probe will see it as a 35\u00b0C solution and compensate to that max 35\u00b0C temperature.<\/p>\n<p>This temperature compensation is calculated by applying an industry standard 2% to the conductivity value for every degree away from 25\u00b0C the temperature reads.<\/p>\n<p>Some instructors may want to remove this temperature compensation from their measurements to do a study of how temperature alters conductivity. To do this, you will have to make sure you are collecting temperature at the same time as conducting with a temperature probe. Once you are finished collecting data, set up a calculated column with the following expression:<br \/>\nUncompensated conductivity = compensated conductivity \/ (1 + ((25 &#8211; Temperature in \u00b0C) * 2 \/ 100))<\/p>\n<p>We also offer the following sensors that allow the user to turn on and off the temperature compensation feature:<br \/>\n<a href=\"\/product\/platinum-cell-conductivity-probe\/\">Platinum-Cell Conductivity Probe<\/a> (<nobr>CONPT-BTA<\/nobr>)<br \/>\n<a href=\"\/product\/go-direct-conductivity-probe\/\">Go Direct<sup>&reg;<\/sup> Conductivity Probe<\/a> (<nobr>GDX-CON<\/nobr>)<br \/>\n<a href=\"\/product\/go-direct-platinum-cell-conductivity-probe\/\">Go Direct<sup>&reg;<\/sup> Platinum-Cell Conductivity Probe<\/a> (<nobr>GDX-CONPT<\/nobr>)<\/p>","protected":false},"excerpt":{"rendered":"<p>The is automatically temperature compensated between temperatures of 5 and 35\u00b0C. Note that the temperature of a solution is being read by a thermistor that&#8230;<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[4982,4980,4981,939],"class_list":["post-2959","post","type-post","status-publish","format-standard","hentry","tag-2-per-degree","tag-conductivity-probe","tag-temp-compensation","tag-temperature"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2959","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=2959"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2959\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=2959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=2959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=2959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}