As the liquid level rises to a height preset in the system, the level switches send data to the controller that closes the feed of additional liquid. In essence, level switches are on/off level control units of a kind.
Float and electrode options
KSR KUEBLER manufactures float switches for installation both from above and from the sides. A float switch is a conventional, rather affordable method for on/-off level measurement. Vertical models are available with several limit messages.
Electrode measurement is a slightly more modern method. It is advantageous in that it’s maintenance-free, since there are no moving parts in the electrode. Electrodes are suitable for clearly higher temperatures as compared to float switches, for which reason they can be used with steam boilers, for example.
If limit data is sufficient for level control, the best solution is a conductive electrode by Gestra that can send out up to four individual limit messages. A compact model is also available where four separate zero voltage change-over contacts have been integrated in the electrode.