Description

In order to perform ORP (Redox) measurements, a Redox electrode must be used in combination with a reference electrode. We offer both integrated and external soil reference electrodes for ORP measurements. See REF-12-0-A – SWAP instruments for additional information.

Our reference electrode is a double junction 3 M KCl gel Ag|AgCl reference electrode. Reference electrodes do need maintenance. For our reference electrodes this means refilling with Electrolyte-100 (3 M KCl gel).

The maintenance frequency depends, amongst others, on soil type, soil moisture content and (ground)water table fluctuations. By applying a microporous polyethylene (MPPE) ring in the SWAP reference electrode, the maintenance frequency can be reduced significantly.

The MPPE ring offers very good contact between the reference electrode and the surrounding soil or sediment, with a minimal leakage of electrolyte. This results in very stable measurements. Depending on local conditions, maintenance frequency varies between quaterly to yearly.

The MPPE rings can also be used in the older models of our soil reference electrodes.