ASTM_F_2044_-_09_2013.pdf

Designation:F204409(Reapproved 2013)An American National StandardStandard Specification forLiquid Level Indicating Equipment,Electrical1This standard is issued under the fixed designation F2044;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers the requirements for electricalliquid level indicating equipment for shipboard low pressureand high pressure tanks containing freshwater,feed water,potable water,seawater,wastewater,diesel fuel,lubricating oil,contaminated oil,refrigerants,JP fuels,and various otherfluids.Application includes compensating tanks in which theequipment must locate the interface.1.2 Each liquid level indicating equipment typically consistsof the following components:(a)One or more sensing devices;(b)Flexible interconnections,if needed;(c)Primary indicator panel assembly;(d)Auxiliary indicator panel assembly,when required;and(e)Portable indicator panel assembly,when required.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.Where information is to be specified,it shall be stated inSI units.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 Special requirements for naval shipboard applicationsare included in the Supplement to this standard.2.Referenced Documents2.1 ASTM Standards:2D3951 Practice for Commercial Packaging2.2 ISO Standards:9001 Quality System Model for Quality Assurance inDesign/Development,Production,Installation,and Ser-vicing33.Terminology3.1 Definitions:3.1.1 hysteresismaximum difference in output,at anymeasurand value within the specified range,when the value isapproached first with increasing and then with decreasingmeasurand.3.1.2 insulation resistancethe resistance measured be-tween insulated portions of a liquid level indicating equipmentand between insulated portions of a liquid level indicatingequipment and ground when a specified dc voltage is appliedunder specified conditions.3.1.3 outputelectrical or numerical quantity,produced bya liquid level indicating sensor or measurement system,that isa function of the applied measurand.3.1.4 pressure cyclingthe specified minimum number ofspecified periodic pressure changes over which a liquid levelindicating sensor will operate and meet the specified perfor-mance.3.1.5 process mediumthe measured fluid(measurand)thatcomes in contact with the sensing element.3.1.6 repeatabilityability of a liquid level indicatingequipment to reproduce output readings when the same mea-surand value is applied to it consecutively,under the sameconditions,and in the same direction.3.1.7 responsethe measured output of a liquid level indi-cating sensor to a specified change in measurand.3.1.8 signal conditioneran electronic device that makesthe output signal from a sensor element compatible with areadout system.3.1.9 wetted partsliquid level indicating equipment com-ponents with at least one surface in direct contact with theprocess medium.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 onElectrical.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 2000.Last previous edition approved in 2009 as F2044-09.DOI:10.1520/F2044-09R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Designation4.1 DesignationMost liquid level indicating equipmentmanufacturers use designations or systematic numbering oridentifying codes.4.2 DesignLiquid level indicating equipment typicallyconsist of a sensing device that may or may not be in contactwith the process medium,a transduction element that modifiesthe signal from the sensing device to produce an electricaloutput,and an indicator panel assembly to show the level of themedium being measured.Some parts of the sensing device maybe hermetically sealed if those parts are sensitive to and may beexposed to moisture.The output cable must be securelyfastened to the body of the sensing device.Avariety of sensingdevices is