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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 sensor 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-BTA probe noisy?

-New order code: ORP-BTA

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
-Dimensions: 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-BTA)
-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 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, $16
-For pH buffer solutions, use pH Buffer Capsule Kit, order code PH-BUFCAP, $29

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