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2. Float switch - Wikipedia

   en.wikipedia.org/wiki/Float_switch

   A pedestal sump pump with a float switch. A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float. Another common type is a float that ...

3. Sump pump - Wikipedia

   en.wikipedia.org/wiki/Sump_pump

   If left in standing water, pedestal pumps should be manually run from time to time, even if the water in the sump is not high enough to trip the float switch. This is because these pumps are incapable of removing all the water in a sump, and the lower bearing or bushing for the pump impeller shaft tends to remain submerged, making it prone to ...

4. Mercury switch - Wikipedia

   en.wikipedia.org/wiki/Mercury_switch

   A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts.

5. External floating roof tank - Wikipedia

   en.wikipedia.org/wiki/External_floating_roof_tank

   External floating roof tank (double deck type) An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.

6. Float (liquid level) - Wikipedia

   en.wikipedia.org/wiki/Float_(liquid_level)

   They may also be incorporated into switch mechanisms or translucent fluid-tubes as a component in monitoring or controlling liquid level. Liquid level floats, or float switches, use the principle of material buoyancy (differential densities) to follow fluid levels.

7. Dry running protection - Wikipedia

   en.wikipedia.org/wiki/Dry_running_protection

   Dry running protection, also known as dry-run protection or dry-running protection, is a type of protection mechanism to prevent a rotor, pump or stirrer shaft from operating without any medium added, as the bearing and shaft seal might be damaged if the motor is run while dry. [1]