A float containing a magnet surrounds the tube and is guided by it. In a float switch the magnetic reed switch is hermetically sealed in a stem most often made from plastic or stainless steel.
Conery Manufacturing Mercury Pump Duty Float Switch N O Suspended 30 Ft Cord
How does a mercury float switch work. Description the eco float is a mercury free float switch for controlling liquid levels in a variety of applications. Once the cooling tower starts using the water for its industrial processes the water level starts dropping. New float switch working principle float switches and water level controls usually start out closed meaning there are no alarms that need to be triggered because the water level is at the predetermined height. One pattern uses a reed switch mounted in a tube. There is a minimum differential between on and off of approximately 35 inches. The mercury displacement switch uses a plunger that dips into a pool of mercury raising the level in the container to contact at least one electrode.
Another common type is a float that raises a rod to actuate a microswitch. When the float raises the magnet to the reed switch it closes. The float encases a sealed magnet which moves up and down the length of the stem as a fluid level rises and falls. One type of float switch uses a mercury switch inside a hinged float. A snap action switch is activated by a steel ball rolling back and forth within a switching tube in a plastic float housing. The sensor probes actually act as their own sensors and do not pass electricity through the probes which keeps them from fouling degrading and deteriorating.
How new float switches work water level controls float switches work by using probes instead of float switches. This design is used in relays in industrial applications that need to switch high current loads frequently.
Gallery of How Does A Mercury Float Switch Work
