Go Direct® ORP Sensor (GDX-ORP)
Specifications and User Guide

-Primary Test: The Go Direct ORP Sensor consists of an ORP Electrode connected to a Go Direct Electrode Amplifier using a BNC connector. Connect the Electrode Amplifier to your device. Run the data-collection program and set up the ORP Sensor to read in units of mV, if necessary. 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
pH 4 buffer solution: 410 – 430 mV
pH 7 buffer solution: 280 – 300 mV
pH 10 buffer solution: 130 – 150 mV

Do any of your sensors require special storage?
How can I keep my pH or ORP storage solution from spilling when the sensor is in use?
Go Direct Electrode Amplifier Troubleshooting and FAQs
I found an ORP electrode that was stored dry. How can I test it to see if the electrode is still working?
Why are the readings from my ORP sensor noisy?
Can I use the ORP Sensor for Cyclic Voltammetry?
How do I change the displayed measurement channel on my Go Direct Electrode Amplifier or ISE Amplifier?

-Calibrate? No
-Electrode responses vary significantly among electrodes, time, and temperature. This behavior drives the need for calibration. However, the Go Direct Electrode Amplifier 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.

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. First, try charging the sensor for several hours. If the sensor still won’t turn on when disconnected from USB, the battery has likely reached its end of life. If you intend to use this sensor wirelessly, the battery will need to be replaced. The rechargeable battery in this sensor is covered by a one year warranty but should last two to five years in typical use.
How do I replace the battery in a Go Direct Wand-Type Sensor?

-For ORP electrode storage solution, use pH Storage Solution (PH-SS)