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1、International Standard 685911 INTERNATIONAL ORGANIZATION FOR STANDARDIZATlONW.!EYHAPOAHAR OPrAHM3AlJMR fl0 CTAHAPTbl3AUlORGANlSATlON INTERNATIONALE DE tiORMALISATlON Aircraft - Proximity switches - Part I : General requirements Akronautique - Dktecteurs de proximitb - Partie 7 : Exigences g these sh
2、all comply with the general requirements specified in this Part of IS0 6859 and also with the requirements appropriate to their method of operation (see clause 1); b) class 2, suitable for less arduous environments; the applicability of the requirements for class 1 switches and differing requirement
3、s, are summarized in annex C. 4.1.2 All switch systems shall operate by a target moving into the influence-field of a sensor to initiate a switching function. Particular methods of sensing and switching shall comply with the relevant Part(s) of this International Standard. 4.1.3 The sealing of the s
4、witch shall comply with the relevant Part(s) of this International Standard. 4.1.4 Overtravel of the target after the switching action has occurred shall be provided; the actual value will be stated in the relevant Part(s) of this International Standard. 4.1.5 All exposed metal parts shall be insula
5、ted from all cur- rent carrying parts, and should be connected to earth via the mounting. 4.1.6 Connections shall be as specified in 6.3.1 for the sensor and in 7.3 for a separate module or relay. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licen
6、see=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:05:33 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8859/l-1982 (El 4.1.7 Each lead or terminal shall be identified by a number in accordance with the diagram on the switch system and/or appropria
7、te drawings. 4.4 Environmental conditions NOTE - Electronic modules for installation in protected zones remote from the sensor may comply with the less stringent environmental con- ditions defined for class 2 (see 4 1 1 and annex C) 4.1.8 The switch system shall be suitable for mounting in any attit
8、ude. The recommended tolerances on installational posi- tion shall take into account any long term drift of operating characteristics 4.4.1 Temperature, pressure and humidity The switch system shall comply with the requirements specified in 10 16 4.1.9 The switch system shall be designed to meet the
9、 en- vironmental conditions specified in 4.4 and shall operate satisfactorily with the power supplies defined in IS0 1540. 4.4.2 Tropical exposure The switch system shall comply with the requirements specified in 10.16 4.1.10 Target and sensor shall be provided with means for en- suring accurately r
10、eproducible alignment as defined in the rele- vant installation drawing. 4.4.3 Resistance to mould growth 4.1.11 The switch system shall be designed to operate with target speeds up to 250 mm/s. The response time shall be kept to a minimum and shall be declared by the manufacturer. The switch system
11、 shall comply with the requirements specified in 10.18. 4.4.4 Vibration For target speeds in excess of 250 mm/s, see 10 12. Unless specified in the relevant Part(s) of this International Standard, the switch system shall comply with the requirements specified in 10.14. 4.1.12 In addition to the decl
12、arations required by ISO/R 224, the manufacturer shall declare the following : a) the limits of target position, along each intended direc- tion of operation, with respect to : 4.4.5 Acceleration The switch system shall comply with the requirements specified in 10.15 for the following acceleration g
13、rades : I) overtravel, 2) differential travel, a) equipment security grade 3; b) structural integrity category A 3) operating position; b) maximum overload current (see 10.11); 4.4.6 Ice formation c) any limitation with respect to adjacent materials or switch system interference. Unless otherwise st
14、ated, the switch system shall be capable of undergoing and passing the ice-formation tests specified in 10.8. 4.2 Marking In addition to the output connection diagram and flying lead identification, the following shall be clearly and indelibly marked on each part : 4.4.7 Fluid contamination The swit
15、ch system shall comply with the requirements specified in 10.19. a) the number of this International Standard and the classification, 4.4.8 Salt mist The switch system shall comply with the requirements specified in 10.20. b) the manufacturer s name or identification; c) the manufacturer s type numb
16、er; 4.5 Sealing d) the manufacturer s date code. The switch system shall comply with the requirements specified in 10 23. 4.3 Electrical and mechanical rating and life 4.6 Explosion proofness The electrical and mechanical ratings of the switch system shall be in accordance with the relevant Part(s)
17、of this International Standard. The switch system shall comply with the requirements specified in 10.21. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:05:33 MDTNo reproduc
18、tion or networking permitted without license from IHS -,-,- ISO 8859/l-1982 (El 4.7 Magnetic influence The switch system shall comply with the requirements specified in 10.22. Its operation shall not be adversely affected by such interference. Because of mutual interference, it may not be possible t
19、o place targets or sensors close together. The supplier shall state any limitations in this respect and shall declare the same in any limitations of use. 4.8 Electromagnetic interference The switch systems shall not radiate, nor conduct, nor be susceptible to radio interference, and shall comply wit
20、h the requirements specified in 10.25. The performance of the switch system shall not be adversely affected by inadvertent pickups from leads which are running in close proximity to the switch leads. 4.9 Supply voltage variation The switch system shall comply with the requirements specified in 10.24
21、. 4.10 Dimensions and mounting methods The dimensions and mounting methods shall be as specified in the relevant Part(s) of this international Standard. 4.11 Overall response time The response time for operation and de-operation shall not exceed 20 ms, unless otherwise specified in the relevant Part
22、(s) of this International Standard. 4.14.2 The switch system should include short circuit protec- tion to operate whether the circuit is made at the time of occur- rence or whether the switch is closed on to the overload. The method of overload function shall be as stated in the relevant Part(s) of
23、this International Standard. Alternatively, the switch system shall comply with the requirements for the short circuit test specified in 10.9. 4.15 Magnetic debris The switch system performance shall not be adversely affected by small particles of metal filings adhering to the target or sen- sor due
24、 to operating or residual magnetism or due to a thin film of grease on these parts. It shall comply with the requirements specified in 10.26. 4.16 Non-magnetic materials The switch system performance, when in its operational mode, shall not be adversely affected by adjacent non-magnetic materials, s
25、uch as aircraft, aluminium alloys and titanium, or any debris from such materials. It shall comply with the requirements specified in 10.26. 4.17 Cable length The switch system performance shall not be adversely affected by up to 80 m of up to size 20 cable between the sensor and any associated elec
26、tronic module. 4.18 Interchangeability There shall be no externally accessible adjustment on any part of the switch system in respect to its electrical performance. Like units or assemblies shall be fully interchangeable, dimen- sionally, electrically, and functionally, without recourse to fur- ther
27、 adjustment. 4.12 Switching arrangements 4.19 Reliability 4.12.1 A minimum of two complementary outputs should be provided. Methods of series and parallel operation shall be stated by the manufacturer. Isolation of the outputs with respect to the input supplies shall also be stated. 4.12.2 Outputs s
28、hall be suitable for control of the loads specified in the relevant Part(s) of this International Standard. 4.12.3 Voltage drops shall comply with the requirements specified in 10.6. 4.13 Positive line switching The switch system should be commutable between a position in the positive line (load or
29、earth) or in the negative line (switch to earth). If this is impracticable, then positive line switching is preferred. The following requirements shall be satisfied in connection with life operation and mean time between failures. 4.19.1 Life operation The switch system shall achieve not less than I
30、O6 operations at the maximum rated resistive load. 4.19.2 Mean time between failure The mean time between failures (MTBF) shall not be less than 10 5 operations at maximum rated resistive load for a declared duty cycle. 5 Target 5.1 General 5.1.1 Form 4.14 Circuit protection 4.14.1 Accidental revers
31、al of the polarity of the supply shall not damage the switch system. The form of target shall be a rigid, robust piece of material, stif- fened, if necessary, so that it can be mounted to project clear of any supporting structure. 4 Copyright International Organization for Standardization Provided b
32、y IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:05:33 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6859/l-1982 (El 5.1.2 Marking The target shall be marked with motion, and with an indication of plicable. The
33、following additional marked : the intended direction of the mounting face, if ap- information shall also be a) the manufacturer s type or part number, b) the number of this International Standard. 5.2 Mechanical properties 5.2.1 Lateral strength The strength of the target in any axis at right angles
34、 to the in- tended direction of motion shall be adequate to withstand a force of at least 900 N, applied at the edge furthest from the mounting, without damage or permanent distortion. 5.2.2 Longitudinal strength The strength of the target along the intended axis of motion, and the strength of the m
35、ounting arrangement, shall be ade- quate to withstand a distributed force of 900 N without damage or permanent distortion. 5.3 Earth bonding Provision shall be made for bonding the target to the airframe such that all exposed metal parts have a resistance to that point of less than 0,025 Q. 6 Sensor
36、 6.1 General 6.1.1 Form The form of the sensor shall comply with the relevant Part(s) of this International Standard. 6.1.2 Marking The sensor shall be marked to indicate the operative face. Addi- tionally, the information specified in 4.2 a), b), c) and d) shall also be marked. 6.1.3 Stacking It sh
37、ould be possible to mount sensors side by side. However, because of the possibility of mutual interference, the supplier shall declare any limitations. 6.2 Mechanical properties 6.2.1 Strength The strength of the sensor in any axis, and the mounting ar- rangements, shall be adequate to withstand a d
38、istributed com- pressive force of 900 N, applied in any direction, without damage or loss of performance. 6.2.2 Flying lead anchorage Wire leads shall be mechanically anchored to withstand a pull of 45 N on any one or combination of leads, without damage to the wire, insulation or sensor 6.3 Electri
39、cal properties 6.3.1 Connections Connections shall be by either wire leads or connectors. Wire leads shall be potted-in and shall have a minimum length of I,8 m. When necessary, wire leads should be etched to ensure proper bonding between the wire and the potting, and shall be protected from damage
40、due to flexing at the point of emergence from the potting. 6.3.2 Earth bonding Provision shall be made for bonding the sensor to the airframe such that all exposed metal parts have a resistance to that point of less than 0,025 Q. 7 Associated relays and electronic modules 7.1 Relay Where a relay is
41、supplied as part of the complete switch system, in order to ensure complete compatibility with sensors, it shall be the responsibility of the supplier to ensure that it will meet all requirements, including compatibility, inter- changeability and reliability. 7.1.1 Marking Relays shall be marked in
42、accordance with 4.2. 7.2 Electronic module Where an electronic module is required as a separate item, it shall be fully interchangeable without adjustment to the switch system. 7.3 Electrical connections Connections to the relay or module may be by any approved method. 8 Tests 8.1 Nature and order o
43、f tests Tests shall be carried out to confirm compliance with the rele- vant requirements of this International Standard. It is not in- tended or recommended that all tests be carried out on every proximity switch. Four kinds of test, are, therefore, specified, as follows Copyright International Org
44、anization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:05:33 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 685911-1982 (El 8.1.1 Production tests (9.1 to 9.10) Production tests
45、shall be performed on every switch in the order stated 8.1.2 Type tests (10.1 to 10.27) Type tests shall be carried out on switches which have passed the production tests. Each basic type of switch shall be sub- jected to type tests in accordance with the schedule in table 1 and in the order stated.
46、 It is not intended that variants of a basic type of switch be subjected to all of the tests. The extent of type tests on such switches shall be agreed between the manufacturers and the approving authority. 8.1.3 Quality assurance tests (11.1 to 11.4) Quality assurance tests shall be performed on sa
47、mples selected in accordance with the schedule in table 6 8.1.4 Serviceability tests The tests recommended to verify the serviceability of switches after storage or use are indicated in annex B. 8.2.9 During any check to ensure correct operation, an in- dicating device shall be connected to each out
48、put circuit of the proximity switch. 8.2.10 100 mH air cored coils shall be used for d.c. inductive endurance load tests. 8.2.11 Targets shall be included in the full type test. 9 Production tests 9.1 Workmanship and finish Each switch system shall be inspected to ensure that it con- forms to the re
49、levant drawings. To ensure that the type test standard has been maintained, workmanship, finish and general assembly shall be to the satisfaction of the approving authority. 9.2 Marking Each switch system shall be marked in accordance with 4.2. 8.2 General test requirements 9.3 Pre-test conditioning 8.2.1 The switches shall be numbered for the purposes of recording and allocation of tests. The actual batch serial