Electrode junctions can have a number of different designs which can also help prevent or reduct clogging:
Porous ceramic - this is the most common type found in electrodes and suitable for general applications. Not suitable for dirty or viscous samples and the junction is easily blocked.
PTFE - this is the junction often found on flat electrodes. They have a good level of chemical resistance. The junction has a larger surface area so is less susceptible to clogging.
Liquid junction – has a renewable liquid junction which offers performance and speed as the electrode can effectively be returned to new at the push of a button.
Open junction – the reference electrolyte is usually a solid gel. Ideal for samples that normally clog up the junction, such as solid and semi solid samples (pastes, gels).