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Line Pressure Probes - These devices sense line pressure (usually by use of an <br />electronic strain gauge) to detect leaks. Critical factors are precision, sample <br />time, thermal stability, operating range, etc. <br />Line Volume Probes - Varies by manufacturer but generally consist of a device of <br />known volume which empties during a leak. By timing this event a leak rate <br />is projected. The device is large in size, and has had difficulty in EPA <br />certification. <br />Float Switch - The switch described previously is used in double wall steel tanks. <br />A smaller float switch is required for double wall fiberglass tanks. <br />Thermal Absorbtion - Same as described previously, used in annular space of <br />double wall fiberglass tanks. <br />Product Soluble - Same as described previously. <br />Light Refraction/Conductivity - Same as described previously. Explained in detail <br />later. <br />Magneto-Strictive Gauge - Currently the most accurate and popular technology <br />used for gauging tanks. Explained in detail later. <br />Capacitivecapacitive 1 1 product1 P <br />probe shaft1'. interpolates This probe re1 :. regularmaintenance <br />1 keep product from building on probe l <br />Float Switch - Installed at a fixed position within the tank to indicate an overfill <br />condition. <br />Controlrig n- a'' 8 <br />