There are few, if any, industries that are as demanding as the chemical and petrochemical industry when it comes to liquid level measurement. Currently there are an estimated 350,000 chemicals and mixtures of chemicals that are registered for commercial production and use. And with this number of different chemicals available, with differing viscosities, densities, specific gravities and potential compatibility issues, getting the right sensors for level measurements can be crucial. 

One factor to consider is the chemical compatibility of the liquid and the material of liquid level sensor being used to measure the chemical. Chemical compatibility is a rough measure of how stable a substance is when mixed with another substance. If two substances can mix together and not undergo a chemical reaction, they are considered compatible. This is a key part to consider when selecting the correct equipment to ensure accurate measurements and longevity of a sensor.  

For example, Acetone is highly compatible with Stainless Steel and that would be an ideal material for a liquid level sensor to be manufactured from. On the other hand, silicon-based liquids have poor compatibility with stainless steel, so other materials would be required for its storage and measurement. 

Where Can Deeter help? 

Our vast range of liquid level sensors and float switches are manufactured in the following materials: 

Stainless Steel 316L
Polyphenylene Sulphide (PPS)

By having several options available for manufacturing, it enables us to ensure the right compatibility with what is being measured and in turn support our customers with their requirements 

This can be highlighted by the different operating temperatures our sensors and switches can be used at. Depending on the material, our sensors can operate between -200°C and +200°C. During our enquiry process we will always ensure we confirm what liquids are being measured and ensure we offer the correct material to ensure chemical compatibility. One way we do this is by using our compatibility tool that will provide the following ratings: 

A – Excellent
B – Good: Minor Effect, slight corrosion, or discoloration
C – Fair: Moderate Effect, not recommended for continuous use. Softening or loss of strength, and swelling may occur
D – Severe Effect: Not recommended for any use. 

Compatibility in use 

We recently received an enquiry for a custom designed LVCS sensor. Our standard versions are designed from 316L Stainless Steel, but as the customer is measuring sulphuric acid, we knew we had to use Polypropylene. Our Polypropylene works perfectly with both the chemical compatibility requirements and above the liquids’ operating temperature.  

By ensuring we have an open dialogue with all our customers and listen to what they need, we are able to work with them to create the right product for their needs. 

If you have any questions about our products or would be interested to see how we can help you then please feel free to contact us on +44 (0)1494 566 046.