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a <br />Float Switch - As shown, this device is constructed of a hermetically sealed, <br />magnetic relay imbedded within a metal stem and actuated by a <br />surrounding float. The float housing is made of brass and is 1.8 inches in <br />diameter. This device is used to detect liquid in the annular space of double <br />wall steel tanks. It is also used in turbine and dispenser sumps. The probe is <br />very simple in construction, requires no maintenance, and is easily checked <br />by manually inverting. <br />Control Engineers, ,) <br />