Discriminating sensors in UST interstices are used to distinguish which of the following?

• A. Liquid types in the interstice
• B. Gas types in the interstice
• C. Temperature in the interstice
• D. Pressure in the interstice

Answer: (A)

Discriminating sensors in the interstice are about identifying what kind of liquid is present there. They’re designed to tell apart liquids such as petroleum products from water, so you know what leaked and how to respond. These sensors leverage differences in properties like conductivity, dielectric constant, or spectral signals to distinguish liquid types, rather than simply sensing presence or measuring temperature or pressure. Gas types would require separate gas sensors, and temperature or pressure sensing serves other monitoring purposes, not liquid identification.