Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

Go Direct ORP Sensor Troubleshooting and FAQs

Go Direct® ORP Sensor, order code GDX-ORP, $99
Specifications and User Guide

TROUBLESHOOTING
-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

RELATED TIL ENTRIES
-TIL 1060: Do any of your sensors require special storage?
-TIL 728: How can I keep my pH or ORP storage solution from spilling when the sensor is in use?
-TIL 3858: Go Direct Electrode Amplifier Troubleshooting and FAQs
-TIL 2467: I found an ORP electrode that was stored dry. How can I test it to see if the electrode is still working?
-TIL 3679: Why are the readings from my ORP sensor noisy?
-TIL 3917: Can I use the ORP Sensor for Cyclic Voltammetry?
-TIL 3984: How do I change the displayed measurement channel on my Go Direct Electrode Amplifier or ISE Amplifier?

CALIBRATION
-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.

RELATED VERNIER PRODUCTS
-For ORP electrode storage solution, use pH Storage Solution, order code PH-SS, $18

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