When you are considering a sump pump float switch you will want to checking out each of the four main types so that you know which is best. Here is an overview of each one.
1. Vertical Action Float Switch
This switch is inexpensive and also great quality. It will float above the water and basically what happens is as the water rises, so does the ball. Once the ball hits a certain level, the switch will be triggered on. The good part about this type of switch is that it doesn't get stuck or jammed as much as others because it has limited movement and only goes up and down.
2. Diaphragm Switch
This is the most expensive type of all of the float switches but it is also the type that is used most among professionals. It is sensitive to water pressure and is immersed underneath. The pump works depending on the water pressure. It becomes concave when the water pressure increases which causes it to turn the switch on and when the pressure goes down, the switch gets turned off. The best part of this float is that while it is expensive, it is relied on by professionals because it doesn't get stuck, which is a common problem with others.
3. Tethered Float
This type is the most commonly used by among those who do many of their at home projects themselves. This one is used for pedestal sump pumps and it floats depending on the height of the water. It does this through a float that hangs from the pump. There are common problems with this type of float though. It can from time to time get caught up and end up sinking and other times it will fail to begin the pump because it isn't activated well enough. While these problems do exist, this type of pump does have an advantage over the others. It is above the water so you don't have to worry about power or electricity at all. Many of the others are in or under the water and therefore need to be watched out for in case of electrical problems.
4. Electronic Switch
This type of switch is often called the flood free switch. This type does not have a float at all, instead of that it is submerged in the water and relies on the water pressure to activate the probe wire inside. There is also another probe in it that is there to trigger a back up in case of any problems.
When choosing one of the four types you will want to keep both the advantages and disadvantages in mind. Another thing to think about is the location of the pump in your home as well as the people or animals living there. If electricity is a huge worry of yours then there are some pumps that are better than others in that department. The same goes for cost. Doing research is the best way to find the pump for you.