1、Comments, suggestions, or questions on this document should be addressed to Defense Supply Center Richmond, ATTN: DSCR-VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616 or e-mailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the currency of this address
2、information using the ASSIST database at http:/assist.daps.dla.mil. AMSC N/A FSC 6620 INCH-POUND MIL-DTL-27188C 19 December 2006 SUPERSEDING MIL-I-27188B 30 April 1994 DETAIL SPECIFICATION INDICATOR, PRESSURE EGU-2/A, OIL, 0-100 PSI Inactive for new design after 28 September 1999. This specification
3、 is approved for use by all departments and agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for one type of hermetically sealed, remote indicating, synchro-style, integrally lighted, oil pressure indicator, designated EGU-2/A. 2. APPLICABLE DOCUM
4、ENTS 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 been made to ensure t
5、he completeness of this list, document users are cautioned that they must meet all specified requirements of the 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 from IHS-,-
6、,-MIL-DTL-27188C 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 solicitati
7、on or contract (see 6.2). FEDERAL STANDARDS FED-STD-595 - Colors Used in Government Procurement (Color chips 37038 and 37875). DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-5541 - Chemical Conversion Coatings on Aluminum and Aluminum Alloys. MIL-T-5796 - Transmitter, Pressure, Oil, 0-100 PSI. MIL-S-7
8、742 - Screw Threads, Standard, Optimum Selected Series: General Specification for. MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys. MIL-T-25624 - Transmitter, Pressure TRU-80/A, Oil, Engine-Mounted, 0-100 PSI. . MIL-L-27160 Lighting, Instrument, Integral, White General Specification fo
9、r. MS28005 - Transmitters, Pressure, Synchro, Aircraft. MS28010 - Indicators, Pressure - Synchro, Single, 2-Inch Size. MS33678 - Connector, Receptacle, Electrical, Integral Mounting. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property. MIL-STD-461 - Require
10、ments for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment. MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests. MIL-STD-889 - Dissimilar Metals. DEPARTMENT OF DEFENSE HANDBOOKS MIL-HDBK-781 - Reliability Test Methods, Plans, and Environ
11、ments for Engineering Development, Qualification, and Production. (Copies of these documents are available at http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) Provided by IHSNot for ResaleNo reproduction or netw
12、orking permitted without license from IHS-,-,-MIL-DTL-27188C 3 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 specified, the issues of the
13、se documents are those cited in the solicitation or contract (see 6.2). STANDARDIZATION DOCUMENTS SD-6 - Provisions Governing Qualification. (Copies of these documents are available at http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philade
14、lphia, PA 19111-5094.) 2.3 Non-government publications. 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 (see 6.2). ASME INTERNATIONAL ASME Y14.100 - Engineer
15、ing Drawing Practices. (Copies of these documents are available online at http:/www.asme.org/ or from ASME International, Three Park Avenue, New York, NY 10016-5990.) SAE INTERNATIONAL SAE AS20708 - Synchros, General Specification for. (Copies of these documents are available online at http:/www.sae
16、.org/ or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applic
17、able laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. Oil pressure indicators furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list (QPL) before c
18、ontract award (see 4.3 and 6.3). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27188C 4 3.2 Material. 3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be
19、 used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements and promotes economically advantageous life cycle costs. 3.2.2 Non-magnetic materials. Non-magnetic materials shall be used for all parts of the indicator, except where magn
20、etic materials are essential. 3.2.3 Non-ferrous materials. Non-ferrous materials shall be used for all parts of the indicator, except where ferrous materials are essential. 3.2.4 Metals. Metals shall be corrosion-resistant or suitably treated to resist corrosion due to fuels, salt fog, or atmospheri
21、c conditions likely to be met in storage or normal service. 3.2.5 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889. 3.2.6 Toxic and corrosive fumes. The i
22、ndicator shall be of such material and construction that when burned, fumes or gases that combine with the atmosphere to form acid or corrosive alkali will not be released. 3.2.7 Protective treatment. When materials are used in the construction of the indicator that are subject to deterioration when
23、 exposed to climatic environmental likely to occur during service usage, the materials shall be protected against such deterioration in a manner that will in no way prevent compliance with the requirements of this specification. The use of any protective coating that will crack, chip, or scale with
24、age or extremes of climatic and environmental conditions shall be avoided. 3.3 Design and construction. The indicator shall be designed for use with a TRU-80/A transmitter in accordance with MIL-T-25624 or an MS28005-2 transmitter conforming to MIL-T-5796. 3.3.1 Case. The case shall be hermetically
25、sealed and the dimensions shall conform to MS28010. 3.3.1.1 Cap. A separate nonhermetically sealed cap may be used on the back of the case for installing the electrical receptacle. The cap shall be made of nonferrous low-density metal. 3.3.1.2 Case-to-cover glass distance. The distance between the o
26、uter surface of the cover glass and the front edge of the case shall be the minimum practicable and shall not exceed 1/32 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27188C 5 3.3.1.3 Filling medium. The filling medium shall be of at
27、 least 98 percent purity, free of dust particles, and shall contain no more than 0.006 milligram (mg) of water vapor per liter (dew point -65 C) at the filling pressure. The filling medium shall be 88 percent to 92 percent nitrogen and the remainder helium. The absolute pressure of the filling mediu
28、m in the case shall be 12 pounds per square inch (psi) to 14.7 psi. Other concentrations of filling medium shall not be used except with prior approval of the procuring activity. 3.3.2 Lighting. The indicator shall be integrally lighted and shall meet all requirements specified herein. The indicator
29、 shall be lighted in accordance with MIL-L-27160. 3.3.3 Pointer. The pointer shall conform to figure 1 and shall be suitable for integral lighting. The length shall be such that the tip of the pointer will extend into the scale a distance equal to 1/3 to 2/3 the length of the shortest graduation. 3.
30、3.3.1 Pointer finish. The lighted portion of the pointer shall be finished in accordance with FED-STD-595, color number 37875. 3.3.4 Dial. The dial shall conform to figure 1. A minimum diameter of 1-3/4 inches shall be maintained across the outside ends of the graduations. The 30-psi graduation shal
31、l be located on the horizontal centerline at the left side of the dial. 3.3.4.1 Dial markings. The following markings shall be finished in durable white in accordance with FED-STD-595, color number 37875. The dimensions of the markings shall be as specified in table I. TABLE I. Marking dimensions. M
32、arking Height or length in inches 1/64 inch Width of line or graduationin inches 0.005 inch Numerals 0, 20, 40, 60, 80, and 100 5/32 0.025 10-pound graduations 3/16 0.031 Graduation at 50 psi 9/64 0.031 Lettering “OIL PRESS“ 1/8 0.020 Lettering “PSI“ 1/8 0.020 5-pound graduations 3/32 0.020 Provided
33、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27188C 6 020406080OILPSIPRESS.10040 15EGU-2/AELECTRICAL ZERO REFERENCE MARKCL316MAX5162732332Dimensions in inches. Unless otherwise specified, tolerances: fractions 1/64 inch. FIGURE 1. Dial and pointer
34、. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27188C 7 3.3.4.2 Black markings. The marking “EGU-2A“ shall be permanently and legibly marked on the dial in letters 1/16 inch high. This marking and the color of all other markings not otherw
35、ise specified shall be finished in durable dull black in accordance with FED-STD-595, color number 37038. 3.3.4.3 Dial visibility. Portions of the minor graduations on the dial shall be visible when viewed from any position within the frustum of a cone, the side of which intersects the outer edge of
36、 the cover glass and makes an angle of 30 degrees with the perpendicular through the center of the dial. 3.3.4.4 Dial to cover glass distance. The distance between the indicator dial and the inside of the cover glass shall be the minimum practicable and shall not exceed 0.188 inch. 3.3.5 Filler tube
37、. A tube or other facility for evacuating and filling the case shall be provided at the rear of the case and shall be recessed beneath the level of the back plate surface. If a tube is used, it shall be of such length to permit refilling of the case three times. 3.3.6 Cover glass. The cover glass sh
38、all be clear, flat, and free from flaws that would interfere with the normal reading of the instrument. The thickness of the cover glass shall be the minimum practicable and suitable for the purpose. 3.3.7 Fasteners. The dial shall be securely fastened to the frame of the mechanism in such a manner
39、that it will not loosen or turn when the indicator is vibrated. If screws are used for attaching the dial, they shall be located so that they will not interfere with dial markings or prevent the markings from being located in the proper position. 3.3.8 Electrical zero reference mark. The dial shall
40、be provided with an electrical zero reference mark on the scale portion equidistant in angular degrees between the first and last dial graduation. 3.3.9 Electrical connector. The indicator shall be provided with an MS33678-14S-5P electrical connector which may be either hermetically or nonhermetical
41、ly sealed. When the connector is nonhermetically sealed, a hermetically sealed baffle plate shall be used to accomplish sealing of the indicator. 3.3.10 Electrical wiring. The internal and external wiring of the indicator shall be in accordance with figure 2. Provided by IHSNot for ResaleNo reproduc
42、tion or networking permitted without license from IHS-,-,-MIL-DTL-27188C 8 BLUEYELLOWREDS2BLACKABCDS1S3R1R2ABCDE4005VLAMPSS2INDICATOR26V 400TRANSMITTERFIGURE 2. Wiring diagram. 3.3.11 Indicator synchro. The indicator synchro shall consist of a salient two-pole wound rotor used as the primary and sha
43、ll be designed for 26 volt (V), 400 cycle, single-phase power, with Y-connected stators as the secondaries. The stators shall be wound so the amplitudes of the induced voltages measured between any two stator leads will vary approximately sinusoidally with the angular positions of the rotor. Pivots,
44、 bearings, and gears shall not bind or shake and shall be as nearly frictionless as possible. 3.3.11.1 Synchro receiver. The synchro receiver used shall have electrical characteristics compatible with those defined in SAE AS20708. 3.3.12 Secondary voltage. The maximum open-circuit voltage measured b
45、etween any two secondary leads shall be 11.8V 3 percent. 3.3.13 Radio noise interference. The indicator shall meet the radiated and conducted radio noise interference requirements of MIL-STD-461. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DT
46、L-27188C 9 3.3.14 Reliability. The indicator shall have a minimum mean-time-between-failures (MTBF) of 2,000 hours based upon a discrimination ratio of 1.5 and a confidence factor of 90 percent when tested as specified in 4.5.22. 3.3.15 Longevity. The indicator shall have an operating live span of 3
47、,000 hours. 3.4 Performance. The indicator shall operate satisfactorily after subjection to the following conditions: a. Temperatures ranging from -65 C to 71 C. b. Vibration of 2 g from 5 cycles per second (cps) to 2,000 cps. c. Pressure altitude of 100,000 feet at -55 C. d. Eight cycles of alterna
48、te immersion in tap water at 85 C 2 C and 5 C 2 C. e. Exposure to salt sea atmosphere for 48 hours without evidence of corrosion or deterioration. 3.4.1 Scale error. Scale error shall not exceed the tolerances specified in tables II and III. TABLE II. Scale error. PSI Tolerance psi 0 1.0 20 1.0 40 1
49、.0 60 1.0 80 1.0 100 1.0 3.4.2 Friction error. Friction error shall not exceed the tolerances specified in table III. 3.4.3 Position error. Position error shall not exceed the tolerances specified in table III. 3.4.4 Dielectric strength. The indicator shall withstand 200V root mean square (rms) at a commercial frequency for a period of 5
