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DSE 5xxx Configuration Software ManualThe resistive fuel level senders supported by the 5xxx series controllers are devices that translatefuel level into resistance. A change in fuel level translates directly to a change in the resistance ofthe sender. In the case of a parallel sided fuel tank, an accurate measure of the fuel level caneasily be made, however as shown in the example below, this is not the case with non-parallelsided fuel tanks. Therefore it is recommended that only parallel sided fuel tanks are used toensure correct fuel level detection.The fuel sender measuresthe distance between the topof the tank and the fuellevel. Typically, they use aball float.In this example, the distancebetween the top of the tankand the level of the fuel is50% of the height of thetank. The fuel level senderwill report the tank correctlyas being 50% full.For a parallel-sided tank likethis one, 50% distancebetween the top of the tankand the level of the fuel willoccur when the tank is 50%full of fuel.In this example, the distancebetween the top of the tankand the level of the fuel isagain 50% of the height ofthe tank, the fuel levelsender will report the tank asbeing 50% full.However, as the bottom ofthe tank is curved, theactual amount of fuel in thetank is only about 40%. Thefuel sender is incorrectlyreporting the amount ofremaining fuel.22DSE 5xxx Configuration software ISSUE 2 02/07/04 AM
DSE 5xxx Configuration Software Manual3.2.2 EDIT DIGITAL INPUTS TABNOTE:- Each of the auxiliary inputs has the same selection choices, allowingflexibility. However, only one of the fixed input functions can be used at any one time.For example only one of the inputs can be configured to be ‘remote start’. The UserConfigurable option is the exception to this rule, and allows any number of inputs tobe used as Indications, Warnings, Shutdowns or as an electrical trip inputPolarityThe polarity of the input switching can be configured to be either“Close to Activate”, this is anormally open switch, and closes to negative when activated. Alternatively“Open to Activate”,this is a Normally Closed switch to negative, and opens when activated.DSE5xxx Configuration software ISSUE 2 02/07/04 AM 23
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