MAINTENANCE

ORP electrodes can develop nutrient build up over time. To miminize build up, always rinse the probe in fresh tap or DI water after every use.

CARE AND USE 

ORP meters usually start performing poorly because of problems with the probe. The two parts of the ORP probe that cause problems are the glass sensing bulb and the reference junction.  ORP sensors have a limited life and response time gets longer with age. Properly maintaining your ORP tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee Maitenance Kit code PH-Main at checkout time!  This will be needed to help clean and condition the ORP electrode before use!

SENSING BULB

The glass bulb loses sensitivity with use and will eventually fail. This is true of all ORP probes.

REFERENCE JUNCTION

The reference junction is a small hole that allows the meter to compare the sample to a reference. The reading is generated based on the electrical difference between the sample and reference. If the junction hole gets clogged, the ORP electrode will no longer function.

You can extend the life of your ORP electrode in the following ways.

STORAGE

To minimize clogging the ORP probe needs to be kept hydrated. Long periods of dry storage will damage the sensitivity of the probe. Allowing the probe to dry out may also result in the junction hole getting clogged.

Store the ORP probe in storage solution MA9015 this will help address both these issues. Do not store in tap water or DI water. This will damage the sensitivity of the probe.

The best way to store the probe is with the probe's cap filled with storage solution or calibration buffer and the cap tightened to prevent leakage. It is also recommended that to store the electrode upright to further reduce the potential for leakage.

CLEANING AND MAINTENANCE

Residue from the sample can impact the sensitivity of the sensing bulb and clog the junction. This is especially true if the sample has a lot of organic material. We recommend regularly soaking your electrode in cleaning solution MA9016. Also:

1.  Inspect the electotrode for damage or scratches, if present replace the electrode.

2.  Inspect the cable.  The connection cable and insulation must be intact.

3.  Connectors should be clean and dry.

4.  Rinse off salt deposits with water or DI water.