What does unsupervised operation mean in relation to safety classes?
Circulators without appropriate safety measures can represent a hazard for personnel and objects. One needs only to consider the possible dangers when temperatures outside the water temperature range involve the use of usually a flammable liquid. Lauda was the first manufacturer to provide special safety fittings on circulators for over temperature protection and low-level protection. Safety devices for circulators were defined for the first time in 1979 in the DIN 12879 standard. With the introduction of safety classes, emphasis is now on particular safety devices depending on the bath liquid being used. In the course of internationalizing standards, DIN 12879 has been replaced by the Euronorms EN 61010-1 and 61010-2-010. Circulators must be equipped with different safety fittings depending on the flammability of the bath liquid. Since the EN standard does not state any concrete requirements in this respect, the necessary requirements to be met are stipulated in the DIN 12876-1 standa
