1、Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, 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 using the ASS
2、IST Online database at https:/assist.daps.dla.mil/. AMSC N/A FSC 5930 INCH-POUND MIL-DTL-12285F 1 September 2010 SUPERSEDING MIL-DTL-12285E 12 May 2004 DETAIL SPECIFICATION SWITCHES, THERMOSTATIC Inactive for new design after 8 March 1999 This specification is approved for use by all Departments and
3、 Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers a level high coolant temperature switch that is designed to generate an alarm by light or audible sound when fluid temperature exceeds predetermined conditions (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 General2.2 . The docum
4、ents 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 been made to ensure the completeness of this lis
5、t, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. Government documents2.2.1 . Specifications, standards, and handbooks. The following specifications, standards, and handbooks fo
6、rm a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw Thread Standards for Federal Services. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-12285/1 - Sw
7、itch, Thermostatic (Long Sensor). MIL-DTL-12285/2 - Switch, Thermostatic (Short Sensor). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12285F 2 STANDARDS MIL-STD-130 - Identification Marking of US Military Property. MIL-STD-202 - Electronic
8、 and Electrical Component Parts. MIL-STD-889 - Dissimilar Metals. (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications.
9、 The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM-G21 - Materials to Fungi, Synthetic Polymeric, Deter
10、mining Resistance of (Copies of these documents are available online at www.astm.org/ or from American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania, 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDS (ISO) ISO10012-1 - Quality Assurance Requirements fo
11、r Measuring Equipment - Part 1; Metrological Confirmation System for Measuring Equipment. (Application for copies can be found online at http:/www.ansi.org or should be addressed to the American National Standards Institute (ANSI), 25 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900
12、, fax 212-302-1286). NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL) NCSL-Z540.3 - Calibration of Measuring and Test Equipment, Requirements for (Application for copies can be found online at http:/www.ansi.org/ or 25 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900, fax 212-30
13、2-1286) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text 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, su
14、persedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets. In the event of any conflict between requirement
15、s of this specification and the specification sheets, the latter shall govern. 3.2 Qualification. 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
16、4.5 and 6.3). 3.3 Materials. Materials shall be as specified herein and in referenced specifications, standards and drawings. Specifications and standards for all materials, parts, and processes which are not specifically designated herein and which are necessary for the execution of this specificat
17、ion shall be selected to meet the performance requirements of this specification. (see 4.7.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12285F 3 3.3.1 Dissimilar metals. Except where necessary to complete an electrical circuit, the swi
18、tch shall be designed and fabricated to minimize galvanic corrosion in dissimilar metal couples as specified in MIL-STD-889 (see 4.7.1). 3.3.2 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 sh
19、all not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.4.3) 3.3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that
20、 the material meets or exceeds the operational and maintenance requirements and promotes advantageous life cycle cost. 3.4 Design and construction. Switches covered by this specification shall be in accordance with MIL-DTL-12285/1 and/or MIL-DTL-12285/2 (see 4.7.1 and 6.2). 3.4.1 Threaded parts. Scr
21、ew threads, of the form, number per inch, and class specified on the applicable drawing, military standard, or figure, shall be in accordance with the applicable sections of FED-STD-H28 (see 4.7.1). 3.5 Performance. 3.5.1 Calibration. The switch shall operate within the temperature ranges specified
22、in MIL-DTL-12885/1 or MIL-DTL-12285/2 (see 4.7.3). 3.5.2 Dielectric withstanding. The switch shall operate within the temperature specified in 3.5.1 with the insulation showing no evidence of cracking, charring, burning, smoking or other damage (see 4.7.4). 3.5.3 High temperature. The switch shall w
23、ithstand being heated for one minute in an oil bath at 177 3C (350 5F), then cooled to room temperature, with the resultant change in calibration (see 3.5.1) being no more than 3C (5.4F) (see 4.7.5). 3.5.4 Waterproofness. The switch shall withstand being submerged for 30 minutes while being operated
24、 at full rated current and voltage, with no evidence of leakage. It shall subsequently meet the requirements of 3.5.1 (see 4.7.6). 3.5.5 Corrosion. The switch shall withstand being subjected to a salt spray (fog) condition for 200 hours with the resultant change in calibration (see 3.5.1) being no m
25、ore than 3C (5.4F) (see 4.7.7). 3.5.6 Fungus. The switch shall operate as specified herein after exposure to 90 days of continuous incubation (see 4.7.8). 3.5.7 Shock. The switch shall withstand shock impact of 100 gravity units (g) with no intermittent contact, sticking of contacts or delay in func
26、tioning. The resultant change in calibration (see 3.5.1) shall be no more than 3C (5.4F) (see 4.7.9). 3.5.8 Vibration. The switch shall withstand simple harmonic motion having an amplitude of 0.03 10 percent ohms or 50g peak, whichever is less, along each of three mutually perpendicular axes with no
27、 intermittent contact, sticking of contacts or delay in functioning. The resultant change in calibration (see 3.5.1) shall be no more than 3C (5.4F) (see 4.7.10). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12285F 4 3.5.9 Endurance. The s
28、witch, when connected in series with a 28 volt direct current (vdc) power source and a 3 candle power (cp) 24v lamp, shall withstand the cyclic thermal exposures specified below with a resultant change in calibration (see 3.5.1) of not more than 3C (5.4F) (see 4.7.11). a. 2500 cycles of alternating
29、immersion in circulating oil baths at temperature of 11C (20F) above and below the switch operating temperature at a frequency that will produce “on” and “off” cycling. b. 25,000 cycles of alternating immersion in circulating oil baths at temperatures 38C (100.4F) and -12C (10F) below the switch ope
30、rating temperature at a frequency of one cycle every four minutes. 3.6 Marking. Each switch shall be marked, in accordance with MIL-STD-130, with the manufacturers name trade-mark or Federal manufacturers code, the operating temperature limits, and the Army part number (see 4.7.2). 3.7 Workmanship.
31、Workmanship shall be such as to assure a finished product free of burrs, scratches, rust, and sharp edges (see 4.7.1). 4. VERIFICATION 4.1 Classification of inspectiona. Qualification inspection (see . The inspection requirements specified herein are classified as follows: 4.5). b. Conformance inspe
32、ction (see 4.6). c. Periodic inspection (see 4.6.2). 4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained by the supplier
33、. The establishment and maintenance of a calibration system to control the accuracy of the measuring and test equipment shall be in accordance with NCSL-Z540.3, ISO10012-1, or equivalent system as approved by the qualifying activity. 4.3 Testing apparatus. Testing apparatus shall include a mounting
34、manifold, a 3 candlepower (cp), 24-volt indicating lamp, connected to a 28-volt direct current (dc) source of electrical energy; laboratory thermometers; pressure gages; and temperature sensors with pressure interlock. Separate temperature controls and heating or cooling apparatus shall be provided
35、for the mounting manifold and bath. 4.4 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with the test conditions specified in the general requirements of MIL-STD-202. 4.5 Qualification inspection (category I switches, see 3.1, and 3.3). Qual
36、ification inspection shall be performed at a laboratory acceptable to the Government (see 6.3), on sample units produced with equipment and procedures normally used in production. 4.5.1 Sample table I. For qualification inspection, the sample size shall be as specified in and the appendix to this sp
37、ecification. The sample units which have been subjected to qualification inspection shall be forwarded to the preparing activity. 4.5.2 Failures. Failure of any switch to comply with the applicable requirements shall be cause for refusal to grant qualification. Provided by IHSNot for ResaleNo reprod
38、uction or networking permitted without license from IHS-,-,-MIL-DTL-12285F 5 4.5.3 Certification of material. When submitting samples for qualification, the manufacturer shall submit certification that the materials used in his components are in accordance with the applicable specification requireme
39、nts, or shall state whether other materials are used. With the qualification test report, the manufacturer shall submit a cross-reference list of the switch parts and the materials used to fabricate those parts. TABLE I. Qualification test sequence. Sample No. Paragraph Test 1 4.7.3 4.7.5 4.7.10 4.7
40、.3 4.7.8 Calibration High temperature Vibration Calibration Fungus 2 4.7.3 4.7.11 4.7.7 Calibration Endurance Corrosion 3 4.7.3 4.7.9 4.7.6 4.7.4 Calibration Shock Waterproofness Dielectric withstanding 4.6 Conformance inspection. 4.6.1 Inspection of product for delivery4.6.1.2. Inspection of produc
41、t for delivery shall consist of group A inspection (see. ) 4.6.1.1 Inspection lot. All switches that appear on the same MS standard or specification sheet and that are offered for delivery at one time shall be considered a lot for purposes of sampling and inspection. 4.6.1.2 Group A inspection table
42、 II. Group A inspection shall consist of the inspections specified in . The inspections may be performed in any order, except dielectric withstanding voltage shall be performed after seal testing. 4.6.1.2.1 Sampling plan table II. Statistical sampling shall be in accordance with and table III. A ran
43、domly selected group(s) of samples is required. For acceptance of the lot there shall be zero occurrences of defects. TABLE II. Group A inspection. Inspection Requirement paragraph Test method paragraph Sampling Plan Examination of product 3.1 4.7.1 4.6.1.2.1 Material 3.3 4.7.1 Design construction 3
44、.4 4.7.1 Calibration 3.5.1 4.7.3 Dielectric withstanding 3.5.2 4.7.4 Marking 3.6 4.7.2 Workmanship 3.7 4.7.2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-12285F 6 TABLE III. Zero defect sampling plan. Lot Size Minimum number of switches to
45、 be tested 1/ 1 - 8 All 9 - 50 5 51 - 90 7 91 - 150 11 151 - 280 13 281 - 500 16 501 - 1,000 19 1,201 - 3.200 23 3,201 - 10,000 29 10,001 - 35,000 35 1/ For lot sizes that are less than the required sample size, all switches shall be tested. 4.6.2 Periodic inspection. 4.6.2.1 Group B inspection tabl
46、e IV. Group B inspection shall be completed in accordance with , in the order shown, within each 3-year period after initial qualification. When a manufacturer has switches qualified under various MS standards or specification sheets, the qualifying activity may authorize group B tests that do not r
47、equire redundant testing on similar product features. Group B inspection shall be performed on sample units that have been produced, using the same manufacturing facilities and processes normally used in production and which have passed group A inspection. A manufacturers normal quality control test
48、s, production tests, and environmental tests may be used to fulfill all or part of group B inspection; however, all of group B inspection shall be completed as specified. Data used may be accumulated within the previous 24 months. 4.6.2.1.1 Sampling plan. The sampling plan and test procedures shall
49、be as specified in the appendix to this specification. The sample units shall be selected from current production. If switches are not in current production, they may be selected from stock; however, all switches shall be date coded within 24 months of the required group B submittal date. When there has been no production of a particular type of switch for a 3-year period, sample units shall be selected from
