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ORP Sensor Troubleshooting and FAQs

About this FAQ

  • Created May 7, 2005
  • Updated Aug 11, 2011
  • Article #1437

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ORP Sensor, order code ORP-BTA, $79
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 pH units. Place the sensor in a buffer solution of known pH and check the readings.
-Secondary Test: Set up the ORP Sensor to run on Logger Pro. Open a file in Probes & Sensors to use the sensor as a pH probe. Place the sensor in a buffer solution of known pH and check the readings.

-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 sensor that was stored dry. How can I test it to see if the electrode is still working?

-new order code: ORP-BTA
-old order code: ORP-DIN
-ORP Electrode
-Type: Sealed, gel-filled, epoxy body, Ag/AgCl reference
-Storage solution: pH-4/KCl solution (10 g KCl in 100 mL buffer pH-4 solution)
-Cable: 1 meter coaxial cable with BNC connector
-Temperature range: 0-60ºC
-Dimesions: 12 mm OD
-Impedance: ~20 kΩ at 25ºC
-ORP element: 99% pure platinum band sealed on a glass stem
-Electrode Amplifier (included with each ORP Sensor)
-Calibration (mV): slope 466.875, intercept –559.793
-Resolution, 12-bit, (LabPro and Go! Link interfaces): 0.5 mV
-Power: 7 mA @ 5VDC
-Input Range: –450 to 1100 mV

-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 appropriate calibration that is stored 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 on page 2 of the sensor booklet.
-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, $16
-for pH buffer solutions, use pH Buffer Capsules, order code PHB, $12

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