The purpose of a float or level switch is to detect and control the level of rises or falls of a liquid in a tank.
Most float switches are the type that just open or close a circuit as the level of liquid in a tank rises or falls. With the more common reed switch, the device will have two electrical contacts sealed in a glass casing. The two leads will be close within the housing, but they will not be touching. The housing with the glass leads will be mounted at a point in the tank to determine the liquid level that triggers the response.In the liquid, you then have a magnetic float. As the level of the liquid in the tank rises or falls, the float will come closer to the leads. When the float is in range, the leads become magnetized and then come together, completing the circuit. When the liquid level changes in a way that brings the float away from the electrical contacts, they separate and the circuit is broken.
An example would be a float that rises with the liquid to trigger a switch that turns on a pump. When the pump has removed enough of the liquid, it can then disengage the pump. Conversely, a float could be configured to float in liquid that needs to maintain a certain level. As the level drops, the float will eventually come in range of the switch. This could then trigger the opening of a valve to refill the tank to a predetermined level.
These are just a few of the more simple functions that a float switch can perform. Depending on the purpose and the design of the switch, they can be applied to much more complex tasks. Understanding the desired application of the switch will help to determine the right type of float switch that should be used and the configuration.
We at dpstar Manufacture and design various type of Maltec Float Switches or Maltec Level Switches.
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