1、 Comments, suggestions or questions on this document should be addressed to Defense Supply Center Columbus, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to switchdla.mil. Since contact information can change, you may want to verify the currency of this address information usi
2、ng the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 5930 INCH-POUND MIL-DTL-12211G 5 February 2009 SUPERSEDING MIL-DTL-12211F 10 March 2003 DETAIL SPECIFICATION SWITCH, PRESSURE This specification is approved for use by all Departments and Agencies of the Department of Defense.
3、1. SCOPE 1.1 Scope. This specification covers two types of automotive pressure switches (see 6.1). Type I switches operate when fluid pressures drop below predetermined values and type II switches operate when fluid pressures exceed predetermined values. 1.2 Classification. Switches furnished under
4、this specification will be of the following types and classes as specified (see 6.2). All switches shall be (waterproof). Type I - Sufficiently low pressure closes contacts. Type II - Sufficiently high pressure closes contacts. Class 1 - High vibration (see 6.4). Class 2 - Low vibration (see 6.4). 2
5、. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has bee
6、n made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license
7、from IHS-,-,-MIL-DTL-12211G 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following 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 cited in the
8、 solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw Thread Standards for Federal Services. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-12211/1 - Switch, Pressure, SPST, Waterproof. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of US Military Property. MIL-STD-202
9、 - Electronic and Electrical Component Parts. MIL-STD-810 - Environmental Engineering Considerations and Laboratory Test. MIL-STD-889 - Dissimilar Metals. MS27152 - Switch, Pressure-Warning. Low Air Pressure 60 PSI, SPST, Waterproof. MS75062 - Switch, Pressure-Stoplight, Vehicular, Air Brake System,
10、 24 Volt, Waterproof. MS75063 - Switch, Pressure-Stoplight, Vehicular, Hydraulic Brake System,24 Volt, Waterproof. MS90530 - Switch, Pressure-Warning SPST, Waterproof, 24 Volt, DC. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization D
11、ocument Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specifie
12、d, the issues of these documents are those cited in the solicitation. DRAWINGS ARMY 7321326 - Sending Unit, Low Oil Pressure Warning. 11669414 - Switch, Pressure. (Copies of drawings required by contractors in connection with specific acquisition functions should be obtained from the acquiring activ
13、ity, or as directed by the contracting officer.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12211G 3 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise s
14、pecified, the issues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/NCSL Z540-1 - Laboratories, Calibration, and Measuring and Test Equipment. INTERNATIONAL ORGANIZATION for STANDARDS (ISO) ISO 10012-1 - Equipment, Qual
15、ity Assurance Requirements for Measuring - Part 1: Meteorological Confirmation System for Measuring Equipment. (Applications for copies can be obtained online at www.ansi.org or through the American National Standards Institute, 11 West 42ndStreet New York, NY 10036). AMERICAN SOCIETY FOR TESTING AN
16、D MATERIALS (ASTM) ASTM B117 - Salt spray (Fog) Apparatus, Operating. (Application for copies can be obtained online at www.astm.org or through the American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959.) (Non-Government standards and other publications are
17、 normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text
18、of this document and the references cited herein (except for related specification sheets), 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 Qualification. The
19、switches furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time of award of contract (see 4.3 and 6.3). 3.2 Materials. Materials shall be as specified herein and in referenced specificatio
20、ns, standards and drawings. Material shall be free of defects that adversely affect performance or serviceability of the finished product (see 4.7.1). 3.2.1 Dissimilar metals. Dissimilar metals shall be protected from galvanic corrosion in accordance with requirements of MIL-STD-889 (see 4.7.1). 3.2
21、.2 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.5). 3.3 Interface and physical dim
22、ensions. Switches shall conform to MS27152, MS75062, MS75063 or MS90530, Drawings 7321326 or 11669414; and to other applicable standards or drawings, as specified (see 4.7.1, 4.7.2 and 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-122
23、11G 4 3.3.1 Threaded parts. Screw threads of the form, number per inch, and class specified on the applicable drawing or military standard shall be in accordance with FED-STD-H28 (see 4.7.2). 3.3.2 Rating. The switch shall be operated in nominal 24 volts (V) direct current (dc) electrical systems, a
24、nd shall operate a nominal 6 watt (3 candlepower) lamp, or loads as specified on applicable MS standards or drawings (see 4.7.2). 3.4 Performance. 3.4.1 Calibration (see 4.7.3). 3.4.1.1 Type I switches. Type I switches shall close on decreasing pressure within the pressure range specified on the app
25、licable MS standard or drawing, and 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 2 pounds per square inch (psi) above the upper value (see 4.7.3.1).
26、 3.4.1.2 Type II switches. Type II switches shall close on increasing pressure, within the actuation range specified on the applicable MS standard or drawing and shall remain closed while the pressure is above the upper value specified therein. Type II switches shall open on subsequently decreasing
27、pressure at not more than the upper value and not less than 2 psi below the lower value (see 4.7.3.2). 3.4.2 Terminal strength. Terminals shall withstand a force of 25 pounds without becoming deformed more than .062 inch (1.57 mm) or evidencing damage to the switch body. The switch shall subsequentl
28、y meet the requirements of 3.4.1.1 or 3.4.1.2, as applicable (see 4.7.4). 3.4.3 Pressure overload. Switches shall withstand a pressure overload, as specified on the applicable MS standard or drawing for 1 minute. After overloading, the change in switch opening or closing pressure shall be not more t
29、han 8 percent. If no overload pressure is specified, pressure shall be 10 times actuating and overload pressures shall conform to table I (see 4.7.5). TABLE I. Pressures for type I, class 2 of MS90530. Actuating pressure Overload pressure (psi) 4 - 8 50 9 - 13 50 15 - 19 50 23 - 27 50 28 - 32 100 44
30、 - 50 100 60 - 65 150 3.4.4 High voltage. Switches shall withstand 220 V root mean square (rms) at 60 hertz (Hz) for 1 minute without evidence of sparking, arcing, burning, smoking, charring, or other insulation damage (see 4.7.6). 3.5 Environmental conditions. 3.5.1 Corrosion resistance. Switches s
31、hall withstand 200 hours of salt spray with no degradation in performance (see 4.8.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12211G 5 3.5.2 Fungus resistance. Switches shall withstand 90 days of exposure to fungus with no degradatio
32、n in performance (see 4.8.2). 3.5.3 Immersion. Switches shall meet the requirements specified in 4.8.3 and there shall be no evidence no leakage. 3.5.4 Extreme temperature resistance. Switches shall open and close within the pressure ranges specified herein or on the applicable MS standard or drawin
33、g, within a temperature range of minus (-) 65 to plus (+) 250 degrees Fahrenheit (F) (see 4.8.4). 3.5.5 Shock. Switches shall withstand an acceleration force of 50 gravity units (gs) applied once in each direction of each axis of the switch. During shock application, switches shall be energized and
34、a pressure of 10 psi above the upper actuation pressure specified on the applicable MS standard or drawing or table II, as applicable, shall be applied to type I switches. Similarly, a pressure of 10 psi below the lower actuation pressure shall be applied to type II switches. Switches shall not actu
35、ate during shock application and shall evidence no loosened, distorted or broken parts (see 4.8.5). 3.5.6 Vibration resistance. 3.5.6.1 Class 1 switches. Class 1 switches shall withstand vibration amplitude of .03 inch (0.7 mm) or 50 gs, whichever is less, in a cycle range of 10 to 3,500 Hz, applied
36、 in each direction of each axis of the switch. During vibration, 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 4.8.6.1). 3.5.6.2 Class 2 switches. Class 2 switches sh
37、all withstand vibration as specified in 3.5.6.1, except amplitude, frequency, and conditions shall be as specified in test condition A, method 204 of MIL-STD-202 (see 4.8.6.2). 3.6 Endurance. Switches shall evidence no malfunction after being cycled 10,000 times from 0 psi to twice the actuation pre
38、ssure specified on the applicable MS standard or drawing, then back to 0 psi. The changes in the pressure at which the switch contacts open and close shall be no more than 8 percent of the actuation pressure specified on the applicable MS standard or drawing (see 4.9). 3.7 Marking. The switch shall
39、be marked in accordance with MIL-STD-130 and as specified on the applicable military drawing or standard. Marking shall include the following information, in the order shown (see 4.7.2): Switch, pressure Military part number Type, grade and class Actuating pressure limits Manufacturers part number M
40、anufacturers name. US 3.8 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes ec
41、onomically advantageous life cycle costs. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12211G 6 3.9 Workmanship. Switches shall be processed in such a manner as to be uniform in quality and shall be free from other defects that will affect
42、 life, serviceability, or appearance (see 4.7.2). 4. VERIFICATION 4.1 Classification of inspections: a. Qualification inspection (see 4.3). b. Conformance inspections (see 4.4). (1) Examination (see 4.4.2). (2) Tests (see 4.4.3). 4.2 Test equipment and inspection facilities. The manufacturer shall e
43、stablish and maintain a calibration system in accordance with ANSI/NCSL Z540-1, ISO 10012-1, or equivalent system as approved by the qualifying activity. 4.3 Inspection conditions and precautions. 4.3.1 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be conducted u
44、nder the following conditions: a. Air temperature 77F + 15F (25C + 80C). b. Barometric pressure 28.5 + 2, - 3 inches mercury (725 + 50 - 75 mm Hg). c. Relative humidity 50 percent + 30 percent. 4.3.2 Precautions. Adequate precautions should be taken during inspection to prevent condensation of moist
45、ure on the switch. Precautions shall also be taken to prevent damage by heat when soldering terminals. 4.3.3 Voltage. Calibration and endurance tests shall be conducted at a source voltage of 28 + 0.5 V dc. 4.4 Qualification. Qualification inspection shall be performed at a laboratory acceptable to
46、the Government (see 6.3) on sample units produced with equipment and procedures normally used in production. 4.4.1 Sample size. Four sample units shall be subjected for qualification inspection. 4.4.2 Inspection routine. Four sample units shall be subjected to the qualification inspections specified
47、 in table II, in the order shown. 4.4.3 Defective. Failure of any qualification sample to pass any of the inspections specified herein may be cause, at the option of the Government, for refusal to conduct additional inspections until the faults revealed by the inspection have been corrected. Provide
48、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12211G 7 TABLE II. Qualification inspection. Inspection Requirements paragraph Method paragraph Number of sample Number of defects Visual and mechanical examination Calibration Terminal strength Pressu
49、re overload High voltage Corrosion resistance Fungus resistance Immersion Extreme temperature resistance Shock Vibration, high frequency Endurance 3.3, 3.3.1, 3.5.1, 3.7, and 3.9 inclusive. 3.4.1 3.4.2 3.4.3 3.4.4 3.5.1 3.5.2 3.5.3 3.5.4 3.5.5 3.5.6 3.6 4.7.1 4.7.3 4.7.4 4.7.5 4.7.6 4.8.1 4.8.2 4.8.3 4.8.4 4.8.5 4.8.6 4.9 4 0 4.5 Retention of qualification. Every 12 months, the manufacturer shall verify the r
