Oxidation-Reduction Potential (ORP): Solutions and spare parts

Components in contact with the measured medium always wear out to a greater or lesser extent. Long-term accurate and reliable measurement therefore requires maintenance. Depending on the type of sensors used, this mainly involves regular calibrations, replacement of worn parts, or entire sensors (where applicable).

You can easily handle a number of these common tasks yourself, saving time and costs. You can find the relevant procedures in the user's manual of the individual products, or we can also advise you over the phone. Below you will find the necessary materials.

ORP reference solution


The reference solution is used to calibrate ORP sensors. The listed ORP value is valid at 25 °C, with the Ag/AgCl reference electrode.

Product codeValueBottle sizes
SS ORP 11225 mV100 ml, 500 ml, 1000 ml
SS ORP 12252 mV100 ml, 500 ml, 1000 ml
SS ORP 13468 mV100 ml, 500 ml, 1000 ml

Auxiliary solutions for pH, ORP and ISE sensors


We can also supply further auxiliary solutions, useful for maintenance of pH and ORP sensors, or for ISE measurements:

  • Deproteining solution for cleaning pH sensors
  • Non-ionic detergent for cleaning pH sensors
  • Storage solution for pH and ORP sensors
  • Reference solutions and salt bridge solutions
  • Conditioning solutions, Ionic Strength Adjustors for ISE measurements