{"id":3967,"date":"2017-08-03T20:22:36","date_gmt":"2017-08-04T03:22:36","guid":{"rendered":""},"modified":"2025-07-17T13:20:03","modified_gmt":"2025-07-17T20:20:03","slug":"3967","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/3967","title":{"rendered":"Go Direct ORP 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-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\"><a href=\"\/product\/go-direct-orp-sensor\/\">Go Direct<sup>&reg;<\/sup> ORP Sensor<\/a> (<nobr>GDX-ORP<\/nobr>)<\/h3>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p><a href=\"\/manuals\/GDX-ORP\">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.gdx-orp._hero.001-scaled.jpg\" alt=\"\"\/><\/figure>\n<\/div>\n<\/div>\n<h3 class=\"wp-block-heading\">Troubleshooting<\/h3>\n<p><strong>General: <\/strong>Press the power button on the sensor to turn it on. Connect your sensor as described in the <a href=\"https:\/\/www.vernier.com\/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> Place the tip of the sensor in a buffer solution of known pH and check the readings. Typical readings, in mV, of various buffer solutions are<br \/>\u26ac pH 4 buffer solution: 410 &#8211; 430 mV<br \/>\u26ac pH 7 buffer solution: 280 &#8211; 300 mV<br \/>\u26ac pH 10 buffer solution: 130 &#8211; 150 mV<\/li>\n<li><strong>Secondary Test:<\/strong> Confirm that the BNC connection is secure.<\/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\/1060\/\">Do any of your sensors require special storage?<\/a><\/li>\n<li><a href=\"\/til\/728\/\">How can I keep my pH or ORP storage solution from spilling when the sensor is in use?<\/a><\/li>\n<li><a href=\"\/til\/3858\/\">Go Direct Electrode Amplifier Troubleshooting and FAQs<\/a><\/li>\n<li><a href=\"\/til\/2467\/\">I found an ORP electrode that was stored dry. How can I test it to see if the electrode is still working?<\/a><\/li>\n<li><a href=\"\/til\/3679\/\">Why are the readings from my ORP sensor noisy?<\/a><\/li>\n<li><a href=\"\/til\/3917\/\">Can I use the ORP Sensor for Cyclic Voltammetry?<\/a><\/li>\n<li><a href=\"\/til\/3984\/\">How do I change the displayed measurement channel on my Go Direct Electrode Amplifier or ISE Amplifier?<\/a><\/li>\n<li><a href=\"\/til\/15786\/\">Go Direct sensor does not connect to LabQuest 2 via Bluetooth.<\/a><\/li>\n<li><a href=\"\/til\/15056\/\">How do I replace the battery in a Go Direct Wand-Style Sensor?<\/a><\/li>\n<li><a href=\"\/til\/6827\/\">Troubleshooting Bluetooth Connections with Go Direct Sensors<\/a><\/li>\n<li><a href=\"\/til\/12943\/\">What can I do if a Go Direct sensor's Bluetooth LED flashes red and green when I try to connect to it and the connection fails?<\/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<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n<h4 class=\"wp-block-heading\"><strong>ORP ELECTRODE<\/strong><\/h4>\n<ul class=\"wp-block-list\">\n<li>Type: Sealed, gel-filled, polycarbonate body, Ag\/AgCl reference, single junction<\/li>\n<li>ORP element: 99% pure platinum band sealed on a glass stem<\/li>\n<li>Accuracy with new electrode: \u00b120 mV<\/li>\n<li>Storage solution: pH-4\/KCl solution (10 g KCl in 100 mL buffer pH-4 solution)<\/li>\n<li>Dimensions<br \/>\u26ac Shaft diameter: 12 mm OD<br \/>\u26ac Shaft length: 15.5 cm<\/li>\n<li>Impedance: ~20 k\u03a9 at 25\u00baC<\/li>\n<\/ul>\n<h4 class=\"wp-block-heading\"><strong>ELECTRODE AMPLIFIER<\/strong><\/h4>\n<ul class=\"wp-block-list\">\n<li>Units: mV<\/li>\n<li>Input range: \u00b11000 mV<\/li>\n<li>Resolution: 0.01 mV<\/li>\n<li>Dimensions (amplifier only): 8.5 cm \u00d7 3 cm \u00d7 1.75 cm<\/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-300\">300 mA Li-Poly<\/a><br \/>\u26ac Battery Life (single, full charge): ~24 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<p>Calibrate? No. The Go Direct ORP has its electrode setup to read voltage (mV). In this configuration, calibration is disabled.<\/p>\n<p>Electrode responses vary significantly among electrodes, time, and temperature. This behavior drives the need for calibration. However, the Go Direct ORP mV response is dictated by the amplifier (as opposed to the electrode) and does not change over time, temperature, or with the electrode being attached. Calibration of the ORP sensor in mV by putting it into different standards does not provide a better mV calibration. It provides a worse calibration as it will assume the ORP is perfect. Then the mV reading will be off regardless of which electrode is connected.<\/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;\">First, 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<\/span>.<br \/><span style=\"font-weight: 400;\"><a href=\"\/product\/go-direct-300-mah-replacement-battery\/\">Go Direct&reg; 300 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-300<\/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\"><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-9d6595d7 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\/electrode-support\/\">Electrode Support<\/a> (<nobr>ESUP<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-sensor-clamp\/\">Go Direct&reg; Sensor Clamp<\/a> (<nobr>GDX-CLAMP<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-ph-bnc-electrode\/\">Go Direct&reg; pH BNC Electrode<\/a> (<nobr>GDX-PH-BNC<\/nobr>)<\/li>\n<li><a href=\"\/product\/stir-station\/\">Stir Station<\/a> (<nobr>STIR<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-drop-counter\/\">Go Direct<sup>&reg;<\/sup> Drop Counter<\/a> (<nobr>GDX-DC<\/nobr>)<\/li>\n<li><a href=\"\/product\/orp-sensor\/\">ORP Sensor<\/a> (<nobr>ORP-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-300-mah-replacement-battery\/\">Go Direct&reg; 300 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-300<\/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\/go-direct-electrode-amplifier\/\">Go Direct<sup>&reg;<\/sup> Electrode Amplifier<\/a> (<nobr>GDX-EA<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-orp-bnc-electrode\/\">Go Direct&reg; ORP BNC Electrode<\/a> (<nobr>GDX-ORP-BNC<\/nobr>)<\/li>\n<li><a href=\"\/product\/storage-solution-bottles-5\/\">Storage Solution Bottles (5)<\/a> (<nobr>BTL<\/nobr>)<\/li>\n<li><a href=\"\/product\/ph-storage-solution\/\">pH Storage Solution<\/a> (<nobr>PH-SS<\/nobr>)<\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Specifications and User Guide Troubleshooting General: Press the power button on the sensor to turn it on. Connect your sensor as described in the Getting&#8230;<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[6519,6670,720,1899],"class_list":["post-3967","post","type-post","status-publish","format-standard","hentry","tag-gdxmain","tag-gdxorpmain","tag-maintil","tag-orpmain"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/3967","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\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=3967"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/3967\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=3967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=3967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=3967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}