Choosing the right material of Float Switch


#1

Float Switches are common components for liquid level sensing applications. They are designed for sensing and maintaining liquid levels to prevent overflow and pump malfunction.
When choosing a float switch, there are variety of materials common to choose from. Which is the best one for your application?

Different float switch materials are specified to work with particular liquids and temperature applications. Any incorrect material selection will cause damage to the switch, as well as potentially result in incorrect data output. Typical float switch materials include:

Materials Suitable Applications
Nylon Oils, diesel, organic chemicals and MEK-based priniing inks
Polypropylene (PP) Acids and alkali, detergents, inorganic and organic chemicals, oils and water
Polyphenylene sulphide (PPS) More aggressive chemicals and higher process temperatures, up to 120°C
Buna/ Nitrophyl Oils, diesel, petrol and water (non-potable applications)
D300 foam (PVC) Most hydraulic oils and many chemical solutions
Stainless steel Most medical and food applications, chemicals, hydraulic fluids, fuel oils and applications with process temperatures up to 135°C