METHOD OF OPERATION:
The miro-switch inside the float, axially mounted in line with the weight, changes contacts according to the float's position, as in the diagram. Therefore as the liquid level drops or rises slowly, a pump or flow control, suitably connected, can be switched in or out to maintain an average level of the liquid. By connecting only one side of the switch, the unit can be also used to fill or empty the tank as required.

MOUNTING:
Whilst there are no hard and fast rules applicable to mounting these units, however the lead should be supported in an enclosed vessel, and in an open vessed it is advantageous to clip the lead to the side especially if excessive turbulence is experienced. To obviate the effects of rapid switching conditions that would result if such turbulence is experienced, it is advantageous to use a maintaining circuit which both safeguards the micro-switch and cuts out any chatter of the starters of associated pumps etc.