ASTM_F_2071_-_00_2017.pdf

Designation:F207100(Reapproved 2017)An American National StandardStandard Specification forSwitch,Position Proximity(Noncontact)or Limit(Mechanical Contact),Fiber-Optic1This standard is issued under the fixed designation F2071;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.1.Scope1.1 This specification covers the requirements for fiber-optic position switches(proximity and limit).This specifica-tion does not include switches that transfer an optical signalfrom one path to another by an external force or energy appliedto the switch.1.2 Special requirements for naval shipboard applicationsare included in the Supplement.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.Where informationis to be specified,it shall be stated in SI 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 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3951 Practice for Commercial Packaging2.2 ISO Standards:3ISO 9001 Quality SystemModel for Quality Assurance inDesign/Development,Production,Installation,and Ser-vicing3.Terminology3.1 Definitions:3.1.1 closed switch,nthe light path is complete;signalfrom transmitter to receiver is complete.3.1.2 closed switch with positive alarm,nthe light path iscomplete.Signal level indicates that the end faces of thesensing element are dirty and require maintenance for contin-ued proper operation.3.1.3 fiber-optic position switch,na device that convertsmeasured position,via changes in fiber-optic properties,to anoutput that is a function of the applied measurand.Thefiber-optic position switch normally consists of a sensor head,optoelectronics module,and connectorized fiber-optic cable.3.1.4 limit switch,na switch that senses a change inposition via mechanical contact.3.1.5 open switch,nthe light path is blocked;signal fromtransmitter to receiver is not complete.3.1.6 optical transmittance change,nthe change in opticalpower level introduced by an environmental,mechanical,orother induced stress.3.1.7 optoelectronics module,nunit of the fiber-opticposition switch that contains the optical transmitter andreceiver,and signal conditioning electronics,necessary toconvert the sensed position to the specified output signal.Theoptoelectronics module may be an expansion card for amicroprocessor-based system,or a stand-alone unit.3.1.8 proximity switch,na switch that senses a change inposition via noncontact means.3.1.9 sensor head,nunit of the fiber-optic position switchthat detects position via changes in optical properties.The1This 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 Aug.1,2017.Published August 2017.Originallyapproved in 2000.Last previous edition approved in 2011 as F2071 00(2011).DOI:10.1520/F2071-00R17.2For 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 International Organization for Standardization(ISO),ISOCentral Secretariat,BIBC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 optoelectronics module interrogates the sensor head to deter-mine the position of the measurand.An optical signal istransmitted from the optoelectronics module to the sensorhead.The optical path is either complete or blocked,dependingon the status of the item being measured,giving an indicationof the position or status of the item back to the optoelectronicsmodule.3.1.10 steady-state supply voltag