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LIQUID LEVEL PROBE <br />DESCRIPTION <br />The INCON Model TSP-LL2 is an advanced family of liquid <br />level probes designed for use with Tank SentineN auto- <br />matic tank gauges. They use magnetostrictive position <br />measurement technology to report the level of either one or <br />two floats. In addition, each probe is equipped with tem- <br />perature sensors located at intervals along its shaft. The <br />TSP-LL2 series of liquid level probes feature exceptional <br />linearity, resolution, and stability, required to achieve the <br />unparalleled performance which Tank Sentinelautomatic <br />tank gauges offer. <br />THEORY OF OPERATION <br />Magnetostrictive sensing technology is the secret to the <br />TSP-LL2liquid level probe's accuracy and stability. A probe <br />consists of a long shaft with one or two magnetic floats that <br />move freely along it. A thin wire of very special material is <br />stretched down the center of this probe shaft. When a <br />measurement is made, a magnetic field is electrically cre- <br />ated around the wave guide for an instant. The wave guide <br />is twisted where that field interacts with the permanent <br />magnet field from one of the floats. This twisting results is <br />a shock wave that travels up the wave guide to the head of <br />the probe where tiny sensors detect its arrival. Because the <br />shock wave travels at a known speed, the time between the <br />creation of the electrically generated field and the arrival of <br />the shock wave is an accurate measure of the float's <br />position. <br />APPLICATION <br />Standard TSP-LL2 probes 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 the <br />TSP-K4A probe installation kit. For applications in chemi- <br />cals or in special tank configurations, probes may be or- <br />dered in special lengths, made from special materials, and <br />with other mounting configurations. INCON's applications <br />engineering staff is available to assist you with your special <br />app4ications at 1-800-833-8328. <br />0 <br />TANK SENTINELO <br />