Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

ORP Sensor Troubleshooting and FAQs

ORP Sensor, order code ORP-BTA, $81
Specifications and User Guide

-Primary Test: The ORP Sensor consists of an ORP Electrode connected to an Electrode Amplifier using a BNC connector. Connect the Electrode Amplifier to the interface. Run the data-collection program and set up the ORP Sensor to read in units of mV. 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: 350 - 360 mV
     pH 7 buffer solution: 270 - 280 mV
     pH 10 buffer solution: 100 - 110 mV
The buffer solutions were prepared using Hydrion buffer capsules, available from Flinn Scientific.

-TIL 1060: Do any of your sensors require special storage?
-TIL 1649: Where can I get calibration solutions for an ORP sensor?
-TIL 728: How can I keep my pH or ORP storage solution from spilling when the sensor is in use?
-TIL 1430: 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?

-Calibrate? Not usually, but it depends on the circumstances surrounding your data collection.
-In most experiments done with an ORP Sensor, the precise potential in mV is not critical; rather, the large rate of change of potential is the most important factor. Thus, you should not have to perform a new calibration when using the ORP Sensor for most experiments. Use the calibration that is automatically loaded with this auto-ID sensor.
-If you are doing water quality testing or performing a chemistry experiment that requires a very accurate calibration, you will need two commercial ORP standards. Conduct a two-point calibration, as detailed in the sensor booklet: Specifications and User Guide
-TIL 1649: Where can I get calibration solutions for an ORP sensor?

-For ORP electrode storage solution, use pH Storage Solution, order code PH-SS, $18
-For pH buffer solutions, use pH Buffer Capsule Kit, order code PH-BUFCAP, $29

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