Method for the protection and/or monitoring of a reference system with reference electrode in analytical measuring techniques, and reference system therefor, wherein an additional monitor electrode is provided for self-monitoring the outer bridge electrolyte (16) for contamination, the
In a system for determining the colloid index in a liquid, an amount of the liquid is taken from the body of liquid and passed through a measuring filter under pressure. The respective volumes of liquid which are passed through the measuring filter and the respective periods of time for
