{"id":4127,"date":"2019-08-12T20:43:42","date_gmt":"2019-08-13T03:43:42","guid":{"rendered":""},"modified":"2025-07-17T07:59:46","modified_gmt":"2025-07-17T14:59:46","slug":"4127","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/4127","title":{"rendered":"Go Direct Oxygen (O\u2082) Gas Sensor Troubleshooting and FAQs"},"content":{"rendered":"<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\"><a href=\"\/product\/go-direct-o2-gas-sensor\/\">Go Direct<sup>&reg;<\/sup> O<sub>2<\/sub> Gas Sensor<\/a> (<nobr>GDX-O2<\/nobr>)<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/manuals\/GDX-O2\">Specifications and User Guide<\/a><\/li>\n<li><a href=\"\/til\/3041\/\">Which Oxygen Gas Sensor do I have?<\/a><\/li>\n<\/ul>\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.gdx-o2._hero.001-scaled.jpg\" alt=\"\"\/><\/figure>\n<\/div>\n<\/div>\n<p class=\"has-very-light-gray-background-color has-background wp-block-paragraph\"><strong>Note:<\/strong> This information is for the Go Direct O\u2082 Gas Sensor. For information about <a href=\"\/product\/o2-gas-sensor\/\">O<sub>2<\/sub> Gas Sensor<\/a> (<nobr>O2-BTA<\/nobr>) see <a href=\"\/til\/1421\/\">O<sub>2<\/sub> Gas Sensor Troubleshooting and FAQs<\/a>.<\/p>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Troubleshooting<\/h3>\n<p class=\"wp-block-paragraph\"><strong>General: <\/strong>Press the power button on the sensor to turn it on. Connect your sensor as described in the <a href=\"\/til\/get-started\/go-direct\">Getting Started instructions for your device<\/a>. (The green LED will flash to indicate the sensor is connected.)<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Primary Test:<\/strong> Blow on the sensor. Do you see a decrease in the Oxygen Gas reading? This tells you that the sensor is responding.<\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Tips<\/h3>\n<p class=\"wp-block-paragraph\">Here are some things to consider<\/p>\n<ol class=\"wp-block-list\">\n<li>Has the sensor been stored upright? The O\u2082 Gas Sensor must be stored upright when not being used. This is necessary to maintain the sensor. Failure to store upright will reduce the life of the sensor.<\/li>\n<li>Is your data-collection period too short? Diffusion of gases is a fairly slow process; there can be some delay in readings.<\/li>\n<li>Are you collecting data in a controlled environment? To collect data in a controlled environment, use the 250 mL Nalgene collection bottle that is included with the sensor.<\/li>\n<\/ol>\n<p class=\"has-text-align-center has-very-light-gray-background-color has-background wp-block-paragraph\">Please see extended troubleshooting tips in the <a href=\"\/manuals\/GDX-O2\">Specifications and User Guide<\/a>.<\/p>\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\/4251\/\">How do I calibrate the Go Direct O2 Gas?<\/a><\/li>\n<li><a href=\"\/til\/4330\/\">Can my Go Direct O2 Gas Sensor be repaired?<\/a><\/li>\n<li><a href=\"\/til\/1060\/\">Do any of your sensors require special storage?<\/a><\/li>\n<li><a href=\"\/til\/2318\/\">Can I use a dishwasher to wash the Nalgene bottle that shipped with my O2 or CO2 Gas Sensor?<\/a><\/li>\n<li><a href=\"\/til\/2386\/\">How can I insert a CO2 Gas Sensor or O2 Gas Sensor into my own container?<\/a><\/li>\n<li><a href=\"\/til\/3846\/\">Can O<sub>2<\/sub> gas concentration be expressed in units of mg\/m\u00b3?<\/a><\/li>\n<li><a href=\"\/til\/4006\/\">What is the volume of gas displaced by the shaft of the CO<sub>2<\/sub> and O<sub>2<\/sub> Gas Sensor? What is the total volume of the Large and Small BioChambers?<\/a><\/li>\n<li><a href=\"\/til\/3857\/\">Will my device work with Go Direct Sensors via Bluetooth?<\/a><\/li>\n<li><a href=\"\/til\/3085\/\">How do I know if my LabQuest will work with Go Direct Sensors and Go Wireless devices?<\/a><\/li>\n<li><a href=\"\/til\/15786\/\">Go Direct sensor does not connect to LabQuest 2 via Bluetooth.<\/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><strong>O\u2082 Gas Sensor Specifications<\/strong><br \/>\u26ac Type: Electrochemical cell<br \/>\u26ac Range: 0-100% (0-1000 ppt) O\u2082<br \/>\u26ac Accuracy (at standard pressure 760 mm Hg): \u00b11% volume O\u2082<br \/>\u26ac Typical resolution: 0.01% O\u2082<br \/>\u26ac Response time: ~12 seconds to 90% of final value<br \/>\u26ac Warm-up time: Less than 5 seconds to 90% of final value<br \/>\u26ac Pressure effect: Directly proportional<br \/>\u26ac Pressure range: 0.5 atm to 1.5 atm<br \/>\u26ac Gas sampling mode: Diffusion<\/li>\n<li><strong>Temperature Sensor Specifications<\/strong><br \/>\u26ac Type: Thermistor<br \/>\u26ac Range: \u201325 to 125\u00b0C<br \/>\u26ac Accuracy: \u00b10.5\u00b0C<br \/>\u26ac Resolution: 0.1\u00b0C<br \/>\u26ac Response time: Less than 5 seconds to 90% of final value<\/li>\n<li>Operating temperature range: 20 to 40\u00b0C (above 35\u00b0C will shorten battery life)<\/li>\n<li>Operating humidity range: 0 to 95% RH<\/li>\n<li>Storage temperature range: \u20135 to 50\u00b0C<\/li>\n<li>Dimensions<br \/>\u26ac Sensor tube: 38 mm length, 28 mm OD<br \/>\u26ac Total length: 155 mm<\/li>\n<li>Connections<br \/>\u26ac Wireless: Bluetooth<sup>\u00ae<\/sup> v4.2 (wireless range 30 m unobstructed) <br \/>\u26ac Wired: USB 2.0 full speed<\/li>\n<li>Battery: <a href=\"http:\/\/www.vernier.com\/gdx-bat-650\">650 mA Li-Poly<\/a><br \/>\u26ac Battery Life (single, full charge): ~8 hours continuous data collection<br \/>\u26ac Battery Life (lifetime): 2 \u2013 5 years (typical)<\/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<h4 class=\"wp-block-heading\"><strong>O\u2082 GAS<\/strong><\/h4>\n<p class=\"wp-block-paragraph\">The sensor is factory calibrated. For many experiments, it will not be necessary to calibrate. However, for more accurate measurements, the sensor can be calibrated using a one-point calibration using a known concentration of atmospheric oxygen. Enter a value of 20.9% oxygen or a corrected value from the table in the Effect of Humidity section of the user manual for air. Once finished, the sensor should read 20.9% (or the value entered in the table).<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Go Direct Oxygen Gas Sensor Calibration\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/AZPB7kQ0faQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div>\n<\/figure>\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h4 class=\"wp-block-heading\"><strong>O\u2082 GAS &#8211; w TC<\/strong> <\/h4>\n<p class=\"wp-block-paragraph\">This sensor channel does not allow calibration since it provides temperature compensated readings based on the O\u2082 and Temperature sensors. To calibrate the O\u2082 sensor channel, see the instructions above.<\/p>\n<h4 class=\"wp-block-heading\"><strong>TEMPERATURE<\/strong><\/h4>\n<p class=\"wp-block-paragraph\">The sensor is factory calibrated and cannot be calibrated by the user.<\/p>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Battery Troubleshooting<\/h3>\n<ol class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge. <\/span><br \/>\u26ac <span style=\"font-weight: 400;\">Try charging the sensor for several hours. <\/span><\/li>\n<li><span style=\"font-weight: 400;\">If the sensor still won\u2019t turn on when disconnected from USB, try swapping the battery with a working sensor to see if the problem follows the battery or stays with the sensor.<\/span><br \/>\u26ac If the problem stays with the sensor, the battery is probably not the issue.<br \/>\u26ac If the problem follows the battery, <span style=\"font-weight: 400;\">the battery has likely reached its end of life.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">If you intend to use this sensor wirelessly, its battery will need replacing. <a href=\"\/product\/go-direct-650-mah-replacement-battery\/\">Go Direct&reg; 650 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-650<\/nobr>)<\/span><\/li>\n<li>See <a href=\"\/til\/15056\/\">How do I replace the battery in a Go Direct Wand-Style Sensor?<\/a> for more information (including a <a href=\"https:\/\/youtu.be\/BRLhaOUjmaI\">video<\/a>).<\/li>\n<\/ol>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p class=\"has-text-align-center has-very-light-gray-background-color has-background wp-block-paragraph\"><span style=\"font-weight: 400;\"><strong>Rechargeable batteries are covered by a one-year warranty.<\/strong><\/span><br \/>Batteries <span style=\"font-weight: 400;\">should last two to five years in typical use. <\/span><\/p>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Related Products<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/micro-usb-to-usb-c-cable\/\">Micro USB to USB-C Cable<\/a> (<nobr>CB-USB-C-MICRO<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-charge-station\/\">Go Direct<sup>&reg;<\/sup> Charge Station<\/a> (<nobr>GDX-CRG<\/nobr>)<\/li>\n<li><a href=\"\/product\/biochamber-2000\/\">BioChamber 2000<\/a> (<nobr>BC-2000<\/nobr>)<\/li>\n<li><a href=\"\/product\/biochamber-250\/\">BioChamber 250<\/a> (<nobr>BC-250<\/nobr>)<\/li>\n<li><a href=\"\/product\/grommets-for-co2-gas-sensor\/\">Grommets for CO<sub>2<\/sub> Gas Sensor<\/a> (<nobr>CO2-GROM<\/nobr>)<\/li>\n<li><a href=\"\/product\/o2-gas-sensor-to-spirometer-adapter\/\">O<sub>2<\/sub> Gas Sensor to Spirometer Adapter<\/a> (<nobr>O2-SPR<\/nobr>)<\/li>\n<li><a href=\"\/product\/o2-gas-sensor\/\">O<sub>2<\/sub> Gas Sensor<\/a> (<nobr>O2-BTA<\/nobr>)<\/li>\n<\/ul>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Replacement Parts<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/go-direct-650-mah-replacement-battery\/\">Go Direct&reg; 650 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-650<\/nobr>)<\/li>\n<li><a href=\"\/product\/micro-usb-cable\/\">Micro USB Cable<\/a> (<nobr>CB-USB-MICRO<\/nobr>)<\/li>\n<li><a href=\"\/product\/250-ml-nalgene-bottle-w-lid\/\">250 mL Nalgene Bottle w\/Lid<\/a> (<nobr>CO2-BTL<\/nobr>)<\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Note: This information is for the Go Direct O\u2082 Gas Sensor. For information about see . Troubleshooting General: Press the power button on the sensor&#8230;<\/p>\n","protected":false},"author":1073,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[4224,6949,1852,2304],"class_list":["post-4127","post","type-post","status-publish","format-standard","hentry","tag-gdx-o2","tag-gdx-o2main","tag-o2main","tag-oxygen"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4127","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\/1073"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=4127"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4127\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=4127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=4127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=4127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}