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How is ORP calibrated?

April 26, 2017calibrated ORP

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How is ORP calibrated?

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ORP does not have to be “calibrated” but it can be tested if desired or required. Standard ORP Test Solutions with stable mV outputs are required. Two types of solutions are available. One type requires you to mix pH buffers 4 and 7 with quinhydrone. These offer 2 different stable values, but the shelf life is only several hours and they cannot be stored. Sensorex part number B125 is a complete kit with everything that you need to complete 2 point testing. A second type of premixed solution is also available. Sensorex offers 2 of these for your analytical testing pleasure. B225 has a stable output of 230 mV, and B425 has a stable output of 450 mV. Shelf life of these solutions is guaranteed for 12 months. Please see ORP Accessories for a complete description and and how to purchase from Sensorex.