Float Switch for Chemical Application

I know my father spoke good of this company SMD Fluid Switch as it was local to BYK Chemie where he worked ... hope it helps you! They might be able to supply you with what you need. One switch for both sulfuric and caustic soda. The SG for Sodium Hydroxide (caustic soda) is at 1.22 and Sulphuric Acid 20% is at 1.14. I found this info from their site. http://www.fluidswitch.com

Specific Gravity (SG) is the ratio of object's density to that of water. Since water has a specific gravity of 1 at sea level, liquids and substances with a specific gravity lower than 1 will float in water. Therefore it is improtant to select the proper float switch and float for your application. When using oils, Buna or NBR floats are best. These floats have a low specific gravity, around .5, and will float well in in most petroleum products ranging from .7 to .86 SG. For example a float switch with a specific gravity of .8 will float well in water but will sink in alcohol which is around .72 SG.

Below is a table liquids for reference.

For more information on SG, please visit the following:

• www.engineeringtoolbox.com/specific-gravity-liquids-d_336.html

Material Selection and Chemical Resistance Information

Choosing the correct switch materials can often mean the difference between years of dependable service and equipment failure. Materials that work well in oils or petroleum products may not be the best for common detergents or hot water.

• Stainless Steel - Ideal for high temperatures, high pressures and corrosive environments such as food equipment, industrial tanks or durable general use.
• Brass, Nylon or PBT stems with Buna-N Float - Good for petroleum products, oils and wastewaters. Buna-N floats have superior buoyancy and can be configured for oil-water interface detection.
• General Use Plastics - Polypropylene, PVC and Polycarbonate good to 105 degrees Good choice for general use, acids or food applications. Can be designed economically or custom molded with additional features for OEM applications.

Material Chemical Resistance Table

http://www.tank-depot.com/engineerdata/chemicalres.pdf

Cross reference the following sites for added material selection information:

http://www.enineeringtoolbox.com/24_336.html

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