Floating Switch.. Wait what ?
Things were quite complicated the first time we got an order from Fauji Fertilizer Company for this device. At first we thought it will be quite an easy task to procure it in Pakistan but to my surprise the supplier that quoted me before the order had a complete different model than the one mentioned in the Purchase Order.
However after looking through many sources we finally had no choice but to procure it from China. We learned through our mistake but now let’s examine it.
The purpose of a float switch is to open or close a circuit as the level of a liquid rises or falls. Most float switches are “normally closed,” meaning the two wires coming from the top of the switch complete a circuit when the float is at its low point, resting on its bottom clip. To complete a circuit, float switches utilize a magnetic reed switch, which consists of two contacts sealed in a glass tube. When a magnet comes close to the two contacts, they become attracted to each other and touch, allowing current to pass through. When the magnet moves away, the contacts demagnetize and separate as shown.
If a pump needs to be turned on to remove liquid from a tank, the float switch would be in the normally open position. If a pump needs to be activated to add water to a tank, the float switch would be normally closed.
