{"id":3608,"date":"2025-04-21T05:01:03","date_gmt":"2025-04-21T05:01:03","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=3608"},"modified":"2025-06-10T12:02:03","modified_gmt":"2025-06-10T12:02:03","slug":"thermistors-a-worked-example","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-thermistor-temperature-measurement\/thermistors-using-the-supplied-spreadsheets\/thermistors-a-worked-example\/","title":{"rendered":"Thermistors: A worked example"},"content":{"rendered":"\n<p>The following example summarizes the procedure for a SPice10200.<\/p>\n\n\n\n<p>A SPice10200 is being used in conjunction with an&nbsp;<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o364\">MMi99<\/a>&nbsp;to control a wine fermenter. The ideal fermentation temperature is 33\u00b0C. Available thermistors are 2K, 5K, 10K and 20K, all with Beta=3920. Find the best possible design to get best resolution at 33\u00b0C.<\/p>\n\n\n\n<p>The SPice10200 gives a choice of Rfeed of 100K and 9.09K. All the available thermistors will be less than 20K at the temperature of interest because it is above 25\u00b0C and the thermistor resistance drops with heat. Remember, best resolution occurs&nbsp;<em>about<\/em>&nbsp;where Rfeed and the thermistors resistances are equal. Hence we intuitively expect a 20K thermistor and 9.09K Vfeed to be best.<\/p>\n\n\n\n<p>Set up the spreadsheet with all the preliminaries as shown below.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Tmin<\/td><td>15<\/td><\/tr><tr><td>Tmax<\/td><td>50<\/td><\/tr><tr><td>R25<\/td><td>20000<\/td><\/tr><tr><td>Beta<\/td><td>3920<\/td><\/tr><tr><td>ADC Span<\/td><td>5<\/td><\/tr><tr><td>ADC input R<\/td><td>9.00E+99<\/td><\/tr><tr><td>Intnl feed Res<\/td><td>0<\/td><\/tr><tr><td>Ext. Shunt resistance<\/td><td>9.000E+99<\/td><\/tr><tr><td>Rfeed<\/td><td>9090<\/td><\/tr><tr><td>Vfeed<\/td><td>6.4393<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The last value, Vfeed, is the result of clicking [FindBestVFeed]<\/p>\n\n\n\n<p>The Tmin value has been selected so room temperatures will give a sensible reading, when the vessel is not in use. What effect does that have on our resolution where it counts, at 33\u00b0C?<\/p>\n\n\n\n<p>With the above settings we get a resolution at 33\u00b0C of 0.305\u00b0C.<\/p>\n\n\n\n<p>If we change Tmin to 28\u00b0C, and click [FindBestVFeed] again, we get 0.26\u00b0C resolution at 33\u00b0C. If we shoot for Tmin=0 we get about 0.35\u00b0C resolution. In this case Tmin is clearly not making very much difference.<\/p>\n\n\n\n<p>If we try the 10K thermistor we get a slightly better resolution of 0.3\u00b0C at 33\u00b0C with Tmin=0\u00b0C. The 5K thermistor gives a very similar result, but with better resolution down at 0\u00b0C and worse above 33\u00b0C. Overall the 10K unit is the best choice, so our intuition was a bit off target!<\/p>\n\n\n\n<p>Now here comes the surprise: The 2K thermistor gives 0.2\u00b0C resolution at 33\u00b0C, though to get there we have to lift Tmin to 16\u00b0C.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The following example summarizes the procedure for a SPice10200. A SPice10200 is being used in conjunction with an&nbsp;MMi99&nbsp;to control a wine fermenter. The ideal fermentation&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3598,"menu_order":9,"template":"","class_list":["post-3608","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Thermistors: A worked example - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thermistors: A worked example - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The following example summarizes the procedure for a SPice10200. A SPice10200 is being used in conjunction with an&nbsp;MMi99&nbsp;to control a wine fermenter. 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