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• <br />LIQUID LEVEL PROBE <br />DESCRIPTION <br />The INCON Model TSP -LL family of liquid level probes <br />are advanced liquid level sensors designed for use with <br />Tank Sentinels automatic tank gauges. They use magne- <br />tostrictive position measurement technology to report the <br />level of either one or two floats. In addition, each sensor <br />is equipped with temperature sensors located at intervals <br />along its shaft. The TSP -LL series of liquid level probes <br />feature the exceptional linearity, resolution, and stability, <br />required to achieve the unparalleled performance which <br />Tank SentinelO automatic tank gauges offer. <br />THEORY OF OPERATION <br />Magnetostrictive technology is the secret to the TSP -LL <br />liquid probe's accuracy and stability. A probe consists of <br />a long shaft with one or two magnetic floats that move <br />freely along it. A thin tubular wire of very special material <br />is stretched down the center of this probe shaft. When a <br />measurement is made, a magnetic field is electrically <br />created around the wave guide for an instant. The wave <br />guide is twisted where that field interacts with the perma- <br />nent magnet field from one of the floats. This twisting <br />results is a shock wave that travels up the wave guide to the <br />head of the probe where tiny sensors detect its arrival. <br />Because the shock wave travels at a known speed, the time <br />between the creation of the electrically generated field and <br />the arrival of the shock wave is an accurate measure of the <br />float's position. <br />APPLICATION <br />Standard TSP -LL Sensors are equipped for use in under- <br />ground petroleum storage tanks and are available in sizes <br />suitable for all common tanks. In most cases you may use <br />the next larger size standard probe in non-standard sized <br />tanks. Installation in a 4 inch riser pipe takes only a few <br />minutes. To make certain that your probe operates reliably <br />for many years to come, INCON recommends the use of <br />the TSP-K4A probe installation kit. For applications in <br />chemicals or in special tank configurations, probes may be <br />ordered in any length, made from special materials, and <br />with other mounting configurations. INCON's applica- <br />tions engineering staff is available to assist you with your <br />special applications at 1-800-833-8328. <br />:7 <br />TANK SENTINEL@ <br />