1、4 - MIL-S-b2742 999990b 1845725 5T4 m MIL-S-62742 30 November 1992 MILITARY SPECIFICATION SWITCH, PRESSURE (METRIC) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers two types of automotive pressure swit
2、ches (see 6.1 and 6.6). Type I switches operate when fluid pressures drop below pressures exceed predetermined values. predetermined values and type II switches operate when fluid 1.2 Classification. Switches furnished under this specification shall be of the following types and classes as specified
3、 (see 6.2). All switches shall be (waterproof). Type 1 Type II Class 1 Class 2 - Sufficiently low pressure closes contacts. - Sufficiently high pressure closes contacts. - High vibration (see 6.4). - Low vibration (see 6.4). Beneficial comments (recommendations, additions, deletions) and any pertine
4、nt data which may be of use in improving this document should be addressed to: U.S. Army Tank-Automotive Command, ATTN: AMSTA-GDS, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. AMSC NIA FSC 5930 D
5、ISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-62742 2. APPLICABLE DOCUMENTS 2.1 Government documents. . 2.1.1 Specifications, standards, and handbooks. The -allo
6、wing specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited
7、 in the solicitation (see 6.2). STANDARDS FEDERAL FED-STD-H28 - Screw Thread Stanc-irds for Federa MIL I TARY Services. MIL-STD-130 - Identification Marking of U.S. Military Property. MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-454 - Electronic Equipment, Standa
8、rd General Requirements for. MIL-STD-889 - Dissimilar Metals. MIL-STD-1184 - Electrical Components for Automotive Vehicles; Waterproofness Tests. (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Navy Publications and Printing
9、 Service Office, Standardization Documents Order Desk, Bldg 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 Non- Government publications. The following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are D
10、OD adopted are those listed in the issue of the DODISS cited in the solicitation. the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise specified, AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 - Salt Spray
11、 (Fog) Testing, Method of (DOD Adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA, 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute
12、 the documents. These documents also may be available in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-62742 999990b LB45727 377 MIL-S-62742 2.3 Order of precedence. In the event of a c
13、onflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6
14、.2), a sample shall be subjected to first article inspection (see 4.4). 3.2 Materials. Materials shall be as specified herein and in referenced specifications, standards and drawings. Material shall be free of defects which adversely affect performance or serviceability of the finished product (see
15、4.8.1). 3.2.1 Dissimilar metals. Dissimilar metals shall be protected from galvanic corrosion in accordance with requirements of MIL-STD-889 (see 4.8.1) 3.2.2 Recycled, virgin and reclaimed materials. There are no requirements for the exclusive use of virgin materials; however, all materials shall b
16、e new and unused. The use of recycled or reclaimed (recovered) materials is acceptable provided that all other requirements of this specification are met (see 6.5.3). 3.3 Design and construction. Switches shall conform to the applicable standards or drawings, as specified (see 4.8.1, 4.8.2 and 6.2).
17、 3.3.1 Threaded parts. Unless otherwise specified in the applicable drawing or military standard, screw threads shall be in accordance with FED-STD-H28 (see 4.8.2). 3.3.2 Rating. The switch shall be operated in nominal 24 volts (V) direct current (dc) electrical systems and shall operate a nominal 6
18、 watt (3 candlepower) lamp, or loads as specified on applicable standards or drawings (see 4.8.2). 3.4 Performance. 3.4.1 Calibration (see 4.8.3). 3.4.1.1 Type I switches. Type I switches shall close on decreasing pressure within the pressure range specified on the applicable standard or drawing, an
19、d shall remain closed while the pressure is below the lower value specified therein. Type I switches shall open on subsequently increasing pressure at not less than the lower value and not more than 14 kPa above the upper value (see 4.8.3.1). 3 Provided by IHSNot for ResaleNo reproduction or network
20、ing permitted without license from IHS-,-,-MIL-S-b2742 m 999990b 1845728 203 m MIL-S-62742 3.4.1.2 Type II switches. Type II switches shall close on increasing pressure, within the actuation range specified on the applicable standard or drawing and shall remain closed while the pressure is above the
21、 upper value specified therein. Type II switches shall open on subsequently decreasing pressure at not more than the upper value and not less than 14 kPa below the lower value (see 4.8.3.2). 3.4.2 Terminal strength. Terminals shall withstand a force of 110 Newtons (N) without becoming deformed more
22、than 1.6 mm or evidencing damage to the switch body. The switch shall subsequently meet the requirements of 3.4.1.1 or 3.4.1.2, as applicable (see 4.8.4). 3.4.3 Pressure overload. Switches shall withstand a pressure overload, as specified on the applicable standard or drawing for 1 minute. After ove
23、rloading, the change in switch opening or closing pressure shall be not more than 8 percent (%). If no overload pressure is specified, pressure shall be 10 times actuating pressure (see 4.8.5). 3.4.4 High voltage. Switches shall withstand 220 V root mean square (rms) at 60 hertz (Hz) for 1 minute wi
24、thout evidence of sparking, arcing, burning, smoking, charring, or other insulation damage (see 4.8.6). 3.5 Environmental conditions. 3.5.1 Corrosion resistance. Switches shall withstand 200 hours of salt spray with no degradation in performance (see 4.9.1). 3.5.2 Fungus resistance. Materials used i
25、n the construction of pressure switches shall be fungus inert in accordance with requirement 4 of MIL-STD-454 (see 4.8.1). 3.5.3 Waterproofness. Switches shall meet the requirements specified for type II, class 2 components of MIL-STD-1184 and evidence no leakage (see 4.9.2). 3.5.4 ;. Switches shall
26、 open and close within the pressure ranges specified herein or on the applicable standard or drawing within a temperature range of minus (-) 54 to plus (+) 121 degrees Celsius (Oc) (see 4.9.3). 3.5.5 Shock resistance. Switches shall withstand an acceleration force of 50 gravity units (9s) applied on
27、ce in each direction of each axis of the switch. During shock application, switches shall be energized and a pressure of 70 kPa above the upper actuation pressure specified in the applicable standard or drawing, as applicable, shall be applied to type I switches. Similarly, a pressure of 70 kPa belo
28、w the lower actuation pressure shall be applied to type II switches. Switches shall not actuate during shock application and shall evidence no loosened, distorted or broken parts (see 4.9.4). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-UIL-S-bZ
29、742 = 999990b 1845729 l14T MIL-S-62742 3.5.6 Vibration resistance. 3.5.6.1 Class 1 switches. Class 1 switches shall withstand a high vibration amplitude of 0.08 cm or 50 gs, whichever is less, in a cycle range of 10 to 3500 Hz, applied in each direction of each axis of the switch. During vibration,
30、switches shall be energized and pressure applied as specified in 3.5.5. Switches shall not actuate during vibration and shall evidence no loosened, distorted or broken parts (see 4.9.5.1). 3.5.6.2 Class 2 switches. Class 2 switches shall withstand a low vibration as specified in 3.5.6.1, except ampl
31、itude, frequency and conditions shall be as specified in test condition A, method 204 of MIL-STD-202 (see 4.9.5.2). 3.6 Endurance. Switches shall evidence no malfunction after being cycled 10,000 times from O kPa to twice the actuation pressure specified in the applicable standard or drawing, then b
32、ack to O kPa. The changes in the pressure at which the switch contacts open and close shall be no more than 8% of the actuation pressure specified in the applicable standard or drawing. No contact shall fail to open or close its individual circuit in proper sequence (see 4.10). 3.7 Marking. The swit
33、ch shall be marked in accordance with MIL-STD-130 and as specified in the applicable military drawing or standard. Marking shall include the following information, in the order shown (see 4.8.2): Switch, pressure Military part number Type, grade and class Actuating pressure limits Manufacturers part
34、 number. Manufacturers name. U.S. 3.8 Workmanship. Workmanship shall be of a quality which will assure a product free of burrs, rust, scratches, chips, sharp edges, loose or defective connectors, cracked insulation, faulty soldering, or other defects which will affect serviceability or appearance. C
35、rimping shall be performed in a workmanlike manner (see 4.8.2). 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible or the performance of all inspection requirements (examination and tests) as
36、specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform a
37、ny of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-62742 999990b 3845730 763 .
38、MIL-S-62742 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specificat
39、ion shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance t
40、o requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First art
41、icle inspection (see 4.4). b. Quality conformance inspections (QCI) (see 4.5). 1. Examination (see 4.5.2). 2. Tests (see 4.5.3). c. Control tests (see 4.6). 4.3 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be performed under the following conditions: a. Air temp
42、erature 25 + 8OC b. Barometric pressure 725 + 50 mm Hg c. Relative humidity 50 + 30% - 75 4.3.1 Voltage. Calibration and endurance tests shall be conducted at a source voltage of 28 + 0.5 Vdc. 4.4 First article inspection. Unless otherwise specified (see 6.2), the Government shall select four switch
43、es produced under the production contract for first article inspection. First article samples shall be inspected as specified in table I. Approval of the first article sample by the Government shall not relieve the contractor of his obligation to supply switches that are fully representative of thos
44、e inspected as a first article sample. Any changes or deviations of the production units from the first article sample shall be subject to the approval of the contracting officer. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-62742 9999906
45、1845731 BTB Title %aterial and 3efects construct ion Zalibrat ion : Type I switches Type II switches Terminal strength Pressure overload High voltage Environmental condit ions Zorrosion resistance Raterproofness: Ex t r erne Shock resistance Vibration resistance: Class 1 Class 2 Endurance temperatur
46、e MIL-S-62742 TABLE I. Classification of inspections. Requirement 3.2 thru 3.3 and 3.5.2 3.3.1, 3.3.2 3.7 and 3.8 3.4.1 3.4.1.1 3.4.1.2 3.4.2 3.4.3 3.4.4 3.5 3.5.1 3.5.3 3.5.4 3.5.5 3.5.6 3.5.6.1 3.5.6.2 3.6 Specimen a b Inspec- t ion 4.8.1 4.8.2 4.8.3 4.8.3.1 4.8.3.2 4.8.4 4.8.5 4.8.6 4.9 4.9.1 4.9
47、.2 4.9.3 4.9.4 4.9.5 4.9.5.1 4.9.5.2 4.10 First article X X X X X X X X X X X X X X Juality conformance Exam X TABLE 11. Order of first article testing. Paragraph no. 4.8.3 4.9.3 4.8.3 4.10 4.8.3 4.8.3 4.8.4 4.9.2 4.9.1 4.8.6 4.8.3 Tests Test Calibration Extreme temperatures Calibration Endurance Ca
48、libration Calibration Terminal strength Waterproofness Corros ion High voltage Calibration :on- :rol 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-62742 999990b La45732 734 = MIL-S-62742 TABLE II. Order of first article testing - Continued.
49、 Specimen C d Paragraph no. 4.8.3 4.9.4 4.9.5 4.8.3 4.8.6 4.8.3 4.8.3 4.8.5 4.8.3 4.8.6 4.8.3 Test Calibration Shock Vibration Calibration High voltage Calibration Calibration Pressure overload Calibration High voltage Calibration 4.4.1 Failure. Failure of any qualification sample to pass any of the qualification inspections specified herein may be cause, at the option of the Government, for refusal to conduct additional inspections until th
