The type A 3.1 conductivity meter consists of a display unit (Housing) and a measuring cell with a cable with each other are connected. Located directly on the display unit Switching contact, designed as a 3-core cable with change-over potential-free is. The measuring cell is intended to be directly connected to the output of an Orben cartridge Production of demineralized water to be screwed. The Power supply of the display unit via a separate Stekkernetzteil, which the mains voltage from 230 V AC to 24 V DC transformed.