{"id":1408,"date":"2019-01-17T19:46:33","date_gmt":"2019-01-18T03:46:33","guid":{"rendered":""},"modified":"2025-04-29T14:09:53","modified_gmt":"2025-04-29T21:09:53","slug":"1408","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/1408","title":{"rendered":"Relative Humidity Sensor Troubleshooting and FAQs"},"content":{"rendered":"<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\"><a href=\"\/product\/relative-humidity-sensor\/\">Relative Humidity Sensor<\/a> (<nobr>RH-BTA<\/nobr>)<\/h3>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p><a href=\"\/manuals\/RH-BTA\">Specifications and User Guide<\/a><\/p>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.vernier.com\/wp-content\/uploads\/2019\/11\/product.rh-bta._hero.001-scaled.jpg\" alt=\"\"\/><\/figure>\n<\/div>\n<\/div>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Troubleshooting<\/h3>\n<ul class=\"wp-block-list\">\n<li><strong>Primary Test: <\/strong>Plug the sensor into an interface and run the data-collection program. Check the readings on the default screen. Move the sensor to two places (one can be a container with a small amount of calcium chloride for low humidity; the other can be a container with a small amount of warm water for higher humidity). Confirm that the relative humidity readings change in a logical manner.<\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Additional Troubleshooting<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/til\/392\/\">Does Vernier sell a weather station?<\/a><\/li>\n<li><a href=\"\/til\/4337\/\">How do I calibrate the Relative Humidity Sensor?<\/a><\/li>\n<li><a href=\"\/til\/4305\/\">My Relative Humidity Sensor thinks it is a UV sensor.  OR I can't find my UV sensors but I seem to have some extra Relative Humidity sensors.<\/a><\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n<ul class=\"wp-block-list\">\n<li>Sensing Element: IH-3602-L Integrated Circuit Humidity Sensor<br \/>(Specifications at 25 \u00baC and 5 VDC)<\/li>\n<li>Range: 0% to 95%<\/li>\n<li>Power: 200 \u00b5A @ 5 VDC<\/li>\n<li>Response Time (time for a 90% change in reading):<br \/>\u26ac In still air: 60 minutes (typical)<br \/>\u26ac With vigorous air movement: 40 seconds (typical)<\/li>\n<li>Typical Resolution: 0.04% RH<\/li>\n<li>Total Accuracy <br \/>\u26ac with saturated salt calibration: \u00b12% RH<br \/>\u26ac with standard calibration: \u00b110% RH<\/li>\n<li>Operating Temperature Range: 0 to 85\u00b0C<\/li>\n<li>Temperature Effect<br \/>\u26ac 0% RH voltage: \u00b10.007% RH\/\u00b0C (negligible)<br \/>\u26ac 50% RH voltage: \u20130.11% RH\/\u00b0C<br \/>\u26ac 95% RH voltage: \u20130.22% RH\/\u00b0C<\/li>\n<li>Default calibration coefficients: Slope 30.43%\/V, Intercept \u201325.81%<\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Calibration<\/h3>\n<p>Calibrate? No. The sensor is set to match the stored calibration before shipping. However, you may want to calibrate the sensor for greater accuracy. There are two methods for calibration.<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Option One:<\/strong> conduct a one-point calibration using the reading from another instrument that measures relative humidity.<\/li>\n<li><strong>Option Two:<\/strong> conduct a two-point calibration. To do this, you must prepare two containers with moistened salts. This process is time-consuming. Refer to the sensor booklet for a detailed set of instructions and a table of salts with relative humidities for five different temperatures.<\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Related Products<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/go-direct-weather-system\/\">Go Direct<sup>&reg;<\/sup> Weather System<\/a> (<nobr>GDX-WTHR<\/nobr>)<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Specifications and User Guide Troubleshooting Additional Troubleshooting Specifications Calibration Calibrate? No. The sensor is set to match the stored calibration before shipping. However, you may&#8230;<\/p>\n","protected":false},"author":41204,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[720,1820,1819,187,1821],"class_list":["post-1408","post","type-post","status-publish","format-standard","hentry","tag-maintil","tag-relative-humiditymain","tag-rh-bta","tag-rh-din","tag-rhmain"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/1408","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\/41204"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=1408"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/1408\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=1408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=1408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=1408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}