{"id":26748,"date":"2023-09-01T15:52:13","date_gmt":"2023-09-01T20:52:13","guid":{"rendered":"https:\/\/test.kele.com\/content\/?page_id=26748"},"modified":"2023-09-01T15:52:28","modified_gmt":"2023-09-01T20:52:28","slug":"range-calibration-of-rtd-transmitters","status":"publish","type":"page","link":"https:\/\/www.kele.com\/content\/technical-reference\/temperature\/range-calibration-of-rtd-transmitters","title":{"rendered":"Range Calibration of RTD Transmitters"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.22.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.22.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.22.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.22.1&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h1 style=\"text-align: center;\"><span style=\"color: #000080;\">Range Calibration of RTD Transmitters<\/span><\/h1>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Use the step-by-step instructions below to field calibrate RTD Transmitters to the desired temperature range. For information about accuracy, see Special Notes on Field Calibration below.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step 1<\/strong><\/p>\n<p>Assemble required equipment: temperature transmitter, 24 VDC power supply, decade box [Model RSU-280 or equal], digital VOM [Fluke Model 87 or equal], trim screwdriver, RTD Resistance vs.Temperature Chart.<\/p>\n<p><strong>Step 2<\/strong><\/p>\n<p>Using the RTD Resistance vs. Temperature Chart for 1000 ohm Platinum, select and record the resistance values for the high and low temperatures in your desired range. Designate these values as\u00a0Low Temp Ohms\u00a0and\u00a0High Temp Ohms.<\/p>\n<p><strong>Step 3<\/strong><\/p>\n<p>Calculate the calibration factor using the ohms recorded in Step 2:<\/p>\n<ul>\n<li>Cal Factor = (High Temp Ohms &#8211; Low Temp Ohms) \/ 16<\/li>\n<\/ul>\n<p><strong>Step 4<\/strong><\/p>\n<p>Using the resistance decade box, select a resistance value within one ohm of the low temperature ohms in Step 2. Do not use a lower value. Measure this resistance with the VOM and record the actual value accurate to hundredths of an ohm. This value will be referred to as MIN REF OHMS. Select a resistance value within one ohm of the high temperature ohms in Step 3. Do not use a higher value. Measure this resistance with the VOM and record the actual value accurate to hundredths of an ohm. This value will be referred to as\u00a0Max Ref Ohms.<\/p>\n<p>Calculate the low mA reference:<\/p>\n<ul>\n<li>Low Ma Ref = (Min Ref Ohms &#8211; Low Temp Ohms \/Cal Factor) + 4<\/li>\n<\/ul>\n<p>Calculate the high mA reference:<\/p>\n<ul>\n<li>High Ma Ref = (Max Ref Ohms &#8211; Low Temp Ohms \/ Cal Factor) + 4<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Step 5<\/strong><\/p>\n<p>Connect the transmitter as shown:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-26752 aligncenter size-medium\" src=\"\/\/www.kele.com\/content\/wp-content\/uploads\/2023\/08\/REFTEM_A-image-300x156.jpg\" alt=\"\" width=\"300\" height=\"156\" srcset=\"\/\/assets.kele.com\/content\/wp-content\/uploads\/2023\/08\/REFTEM_A-image-300x156.jpg 300w, \/\/assets.kele.com\/content\/wp-content\/uploads\/2023\/08\/REFTEM_A-image-768x399.jpg 768w, \/\/assets.kele.com\/content\/wp-content\/uploads\/2023\/08\/REFTEM_A-image.jpg 804w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Step 6<\/strong><\/p>\n<p>Set the\u00a0Zero\u00a0and\u00a0Span\u00a0potentiometers:<\/p>\n<ol>\n<li>Set the Min Ref Ohms on the decade box and adjust the Zero potentiometer on the transmitter for the Low mA REF calculated in Step 4<\/li>\n<li>Set the Max Ref Ohms on the decade box and adjust the Span potentiometer on the transmitter for the High mA REF calculated in Step 4.<\/li>\n<li>Repeat A and B as necessary.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Special Notes On Field Calibration<\/strong><\/p>\n<p>The accuracy of a field-calibrated RTD transmitter is highly dependent on the accuracy of the ohmmeter used to measure the sensor substitution resistances (MIN and MAX REF OHMS). The percent accuracy of the calibrated RTD transmitter is not the same as the percent accuracy of the ohmmeter.<\/p>\n<p>OHMMETER ACCURACY TRANSMITTER ACCURACY (% of reading)<\/p>\n<table style=\"border-collapse: collapse; width: 57.7068%; height: 132px;\" border=\"1\">\n<tbody>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\"><strong>Accuracy<\/strong><\/td>\n<td style=\"width: 33.3333%; height: 24px;\"><strong>Low Temp<\/strong><\/td>\n<td style=\"width: 33.3333%; height: 24px;\"><strong>High Temp<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\">1 %<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b14\u00b0F<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b17\u00b0F<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\">0.5 %<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b12\u00b0F<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b13.5\u00b0F<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\">0.25 %<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b11\u00b0F<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b11.8\u00b0F<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\">0.1 %<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b10.4\u00b0F<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b10.7\u00b0F<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px;\">0.05%<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b10.2\u00b0F<\/td>\n<td style=\"width: 33.3333%; height: 24px;\">\u00b10.36\u00b0F<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Range Calibration of RTD Transmitters &nbsp; &nbsp;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"full-width.php","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"folder":[251],"class_list":["post-26748","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Range Calibration of RTD Transmitters - kele.com<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.kele.com\/content\/technical-reference\/temperature\/range-calibration-of-rtd-transmitters\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Range Calibration of RTD Transmitters - kele.com\" \/>\r\n<meta property=\"og:description\" content=\"Range Calibration of RTD Transmitters &nbsp; 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