LONDEX, LTD., 207 Anerley Road, London, S.E.20, have introduced a patented system (“Lectralevel”) of floatless liquid level control, designed for automatically pumping out, filling or maintaining the ...

Over the years, control relays of various types have been used by the hundreds — even thousands — to control nearly every function in commercial and industrial processes. Today, many of those ...

The CLD/P Series of multi-function conductive-liquid level controllers are designed to allow easy monitoring of two to four level points, with simple selection of functions, including filling, ...

Relays and contactors use a variety of technologies to switch signals and power connections. Many devices called relays use similar techniques and topologies, but the terminology can be confusing.