{"id":4128,"date":"2019-08-12T20:42:16","date_gmt":"2019-08-13T03:42:16","guid":{"rendered":""},"modified":"2025-06-04T14:25:30","modified_gmt":"2025-06-04T21:25:30","slug":"4128","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/4128","title":{"rendered":"Go Direct CO\u2082 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-co2-gas-sensor\/\">Go Direct<sup>&reg;<\/sup> CO<sub>2<\/sub> Gas Sensor<\/a> (<nobr>GDX-CO2<\/nobr>)<\/h3>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p class=\"wp-block-paragraph\"><a href=\"\/manuals\/GDX-CO2\">Specifications and User Guide<\/a><\/p>\n<\/div>\n<div class=\"wp-block-column is-vertically-aligned-center 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-co2._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 CO\u2082 Gas Sensor. For information regarding the <a href=\"\/product\/co2-gas-sensor\/\">CO<sub>2<\/sub> Gas Sensor<\/a> (<nobr>CO2-BTA<\/nobr>), see <a href=\"\/til\/1366\/\">CO\u2082 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>Start the software and identify your sensor, if necessary. Let the sensor warm up for at least 180 seconds before continuing. Blow directly on the shaft of the sensor. You should see an increase in CO\u2082 levels.<\/li>\n<li><strong>Secondary Test:<\/strong> If the CO\u2082 Gas Sensor is not giving reasonable readings in the Primary Test, try calibrating it. This should ideally be done outside in fresh air (which should be close to 400 ppm).<\/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\/2567\/\">Can I place the CO\u2082 sensor into a water sample? Does your CO\u2082 sensor measure dissolved CO\u2082? Do you have a dissolved CO\u2082 sensor?<\/a><\/li>\n<li><a href=\"\/til\/19143\/\">How should I protect my CO\u2082 Gas sensor or Go Direct CO\u2082 Gas sensor when using it with small animals or soil?<\/a><\/li>\n<li><a href=\"\/til\/2205\/\">How do I get good CO\u2082 and O\u2082 gas data during photosynthesis?<\/a><\/li>\n<li><a href=\"\/til\/3351\/\">Which CO\u2082 Gas sensor do I have?<\/a><\/li>\n<li><a href=\"\/til\/2862\/\">How do I use the Ethanol sensor with a CO\u2082 Gas sensor to measure fermentation?<\/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>CO\u2082 Sensor<\/strong><br \/>\u26ac Type: NDIR<br \/>\u26ac Range: 0\u2013100,000 ppm<br \/>\u26ac Accuracy<br \/>\u2003<small>\u25c6<\/small> 0 to 1,000 ppm: \u00b1100 ppm<br \/>\u2003<small>\u25c6<\/small> 1,000 to 10,000 ppm: 100 ppm \u00b1 5% of reading<br \/>\u2003<small>\u25c6<\/small> 10,000 ppm to 50,000 ppm: \u00b110% of reading<br \/>\u2003<small>\u25c6<\/small> 50,000 to 100,000 ppm: \u00b115% of reading<br \/>\u26ac Resolution: 1 ppm CO<sub>2<\/sub><br \/>\u26ac Warm-up time: 180 s<br \/>\u26ac Gas sampling type: Diffusion<\/li>\n<li><strong>Temperature Sensor<\/strong><br \/>\u26ac Type: integrated circuit (IC)<br \/>\u26ac Accuracy: \u00b10.5\u00b0C<br \/>\u26ac Resolution: 0.1\u00b0C<\/li>\n<li><strong>Relative Humidity Sensor<\/strong><br \/>\u26ac Type: integrated circuit (IC)<br \/>\u26ac Accuracy: \u00b15% or better<br \/>\u26ac Resolution: 0.1%<\/li>\n<li>Operating conditions (all sensors)<br \/>\u26ac Normal temperature range: 20 to 40\u00b0C<br \/>\u26ac Humidity range: 5 to 95% (non-condensing)<\/li>\n<li>Dimensions:<br \/>\u26ac Sensor shaft length: 82 mm<br \/>\u26ac Sensor shaft diameter: 28 mm<br \/>\u26ac Total length: 200 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>CO<strong>\u2082<\/strong> SENSOR<\/strong><\/h4>\n<p class=\"wp-block-paragraph\">Calibration is usually not necessary, but if needed, it is best to calibrate using outside fresh air.<\/p>\n<ol class=\"wp-block-list\">\n<li>Fill the 250 mL Nalgene bottle to the brim with water, take it outside, and dump the water to ensure it is then filled with fresh air. <\/li>\n<li>While still outdoors, insert the sensor into the bottle that now contains fresh outside air. Take the bottle and sensor to where the calibration will be done.<\/li>\n<li>Start the software and connect your sensor. Let the sensor warm up for at least 180 seconds before continuing.<\/li>\n<li>When the sensor has warmed up (readings should have stabilized), calibrate the sensor using a one-point calibration. Enter a value of 400 ppm for the sample of air collected. Once finished, the sensor should read very close to 400 ppm.<\/li>\n<\/ol>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h4 class=\"wp-block-heading\"><strong>TEMPERATURE and RELATIVE HUMIDITY SENSORS<\/strong><\/h4>\n<p class=\"wp-block-paragraph\">The temperature and relative humidity sensors are 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, it is likely that the battery just needs to be charged. <\/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 the battery is indeed at the end of its life, the sensor cannot be used even if connected by USB, so the battery will need to be replaced. <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\/co2-gas-sensor\/\">CO<sub>2<\/sub> Gas Sensor<\/a> (<nobr>CO2-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>\n<p class=\"wp-block-paragraph\">","protected":false},"excerpt":{"rendered":"<p>Specifications and User Guide Note: This information is for the Go Direct CO\u2082 Gas Sensor. For information regarding the , see Troubleshooting General: Press the&#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":[1691,860,2085,6950,3452],"class_list":["post-4128","post","type-post","status-publish","format-standard","hentry","tag-carbon-dioxide","tag-co2","tag-gdx-co2","tag-gdx-co2main","tag-main"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4128","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=4128"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4128\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=4128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=4128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=4128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}