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01/20/2003 14:37 19163728894 SHIELD, PER & CO. PAGE 01 <br />1: a a i , s]• <br />DESCRIPTION <br />The TSP-E.T.S Liquid Sensor is an electro -optic liquid sensor <br />whicli may be used with all Tank Sentinel" automatic tank <br />gauge consoles equipped with point sensor inputs. It may be <br />installed in the space between the walls of double wall tanks, <br />in sumps, or in other locations where the presence of liquid <br />indicates a leak has occurred. TheTSP-ETSismade ofthemically <br />resistant polysulfone plastic to assure compatibility with most <br />liquids and is supplied with 25 feet of oil resistant cable <br />attached. A normally closed output circuit provides supervised <br />operation, ensuring that broken wires and similar failures will <br />not go undetected. <br />THEORY OF OPERATION <br />The Accret to the TSP-EIS's reliability is its electro -optic <br />technology. Inside the body of the probe, a small light -emitting <br />diode creates a beam of infrared light. This light travels through <br />the transparent plastic prism to its surface. If the probe is dry, <br />the light is reflected back to the light sensor. When the probe <br />is immers-ed in liquid, the Hot travels out of the prism, and. no <br />light is reflected back to the light sensor. The light sensors <br />output signal is used to indicate whether the probe is wet ordry. <br />2.62 <br />,02 <br />RaH <br />WEX <br />W-1253mv,A <br />APPLICATION <br />The TSP-ETSMay be installed in fiberglass or steel double wall <br />tanks as well as in sumps and other locations. To install the <br />,sensor in a fiberglass tank, it is typically pulled into the <br />interstitial space using a "fish" string or wire. In steel tanks, the <br />probe is usually lowered directly to the bottom of the interstitial <br />space through a 2 -inch NPT fitting provided for that purpose. <br />Installation kits are available which include a riser cap and <br />other parts required to complete the installation. <br />INS, <br />ft—Mm q I mo In NO M 10 b d —=Trio <br />P.O. BOX 638 ® SaVO, ME 04072 USA <br />900-m-8320 1207-28:1-01 as <br />Fax: 207-2&1.0158 <br />