1、 Comments, suggestions, or questions on this document should be addressed to Defense Logistics Agency - Aviation, ATTN: DLA Aviation-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
2、 this address information using the ASSIST database at https:/assist.daps.dla.mil. AMSC N/A FSC 6685 INCH-POUND MIL-DTL-25026C 16 May 2011 SUPERSEDING MIL-I-25026B 15 February 1985 DETAIL SPECIFICATION INDICATOR, TEMPERATURE, THERMOCOUPLE, ENGINE EXHAUST, TYPE MJ-4 This specification is approved for
3、 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 single pointer, engine exhaust thermocouple temperature indicator designated Type MJ-4. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this
4、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 list, document users ar
5、e 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. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document to the ex
6、tent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). Inactive for new design after 24 March 1999. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25026C 2
7、DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-I-7071 - Indicator, Temperature, Thermocouple, Hermetically Sealed, General Specification for MS33639 - Case, Instrument, Clamp-Mounted, Aircraft DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property (Copies of these d
8、ocuments are available online at https:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-government publications. The following documents form a part of this document to the extent specified herein. Unless oth
9、erwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY ANSI/ASQ Z1.4 - Sampling Procedures and Tables by Inspection of Attributes (Copies of ANSI/ASQ Z1.4 are available online at www.asq.org or from ASQ, 600 North Plankinton Aven
10、ue, Milwaukee, Wisconsin 53203) AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA NASM961 - Washer, Flat, Electrical NASM35214 - Screw, Machine-Pan Head, Cross-Recessed, Brass, UNC-2A NASM35215 - Screw, Machine-Pan Head, Cross-Recessed, Brass, UNF-2A NASM35338 - Washer, Lock-Spring, Helical, Regular (Medi
11、um) Series (Copies of these documents are available online at www.aia-aerospace.org/or from Aerospace Industries Association of America, 1250 I St. NW, Suite 1100, Washington DC, 20005) 2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
12、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, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo re
13、production or networking permitted without license from IHS-,-,-MIL-DTL-25026C 3 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of
14、 this specification and the specification sheet, the latter shall govern. 3.2 General. The requirements specified in MIL-I-7071, except qualification requirements, shall be applicable as requirements of this specification. Additional requirements shall be specified herein. 3.2.1 Precedence. In the e
15、vent the requirements of MIL-I-7071 and this specification conflict, the requirements of this specification shall govern. 3.3 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.1.1. 3.4 Recycled, recovered, or environmentally prefera
16、ble 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 economically advantageous life cycle costs. 3.5 Construction. 3.5.1 Case.
17、The indicator shall conform to figures 1 and 2. 3.5.2 Case back. The back of the indicator case shall be distinctly marked to indicate “+” for the chromel terminal stud and “-” for the alumel terminal stud. The statement “USE 8 OHM C-A LEADS” shall be plainly marked on the back of the case. 3.5.3 Di
18、al. The dial of the indicator shall conform to figure 1. 3.5.3.1 Scale arc. The indicator shall provide a minimum scale arc angle of 250 degrees. The length of the scale arc shall not be less than 6.25 inches as measured on the outer arc of the scale. The mechanism shall not be geared to obtain the
19、specified scale arc. 3.5.3.2 Scale distribution. The scale of the indicator shall be as linear as is practical and shall not be contracted by more than 20 percent between any two adjacent scale graduations. 3.5.4 Pointer. The shape of the pointer shall facilitate reading of any point in the range of
20、 the dial. 3.5.4.1 Pointer overlap. The pointer length shall be of such that the pointer tip will extend into the longest scale graduation a distance of 0.094 0.016 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25026C 4 3.5.4.2 Pointe
21、r overswing. The pointer overswing shall not be less than 3 angular degrees beyond each end of the scale. 3.6 Weight. The weight of the complete indicator shall not exceed 1.2 pounds. 3.7 Identification of products. Equipment, assemblies, and parts shall be marked for identification in accordance wi
22、th MIL-STD-130. 4. VERIFICATION 4.1 General specification. The indicator shall be subjected to the verification provisions in accordance with MIL-I-7071 except as specified herein. 4.1.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First a
23、rticle inspection see MIL-I-7071 qualification testing b. Conformance inspection see MIL-I-7071 quality conformance testing 4.2 Test conditions. 4.2.1 Test tolerance. The tolerances specified in Table I, not enclosed in parentheses, are applicable only when the indicators are subjected to all the te
24、sts in the sequence specified herein. The tolerances specified in Table I, enclosed in parentheses, are applicable only when the indicators are subjected to a specific test independent of sequence. 4.2.2 Sampling. Lot formation, sampling, and retest shall be in accordance with ANSI/ASQ Z1.4. 4.2.2.1
25、 Sampling plan A. Sampling plan A shall be inspection level II. 4.2.2.2 Sampling plan B. Sampling plan B shall be inspection level S-1. 4.3 Test methods. Unless otherwise specified, the test listings below are only the tolerances or requirements of the tests specified in MIL-I-7071. Lack of listing
26、herein does not waive the test requirement. 4.3.1 Individual tests. Testing shall be in accordance with MIL-I-7071 individual tests. 4.3.1.1 Scale error at room temperature. The indicator pointer shall first be set to read 700C when the millivoltage for 700C, as specified in the Electromotive force
27、for Chromel-Alumel thermocouple table of MIL-I-7071, for the ambient room temperature is applied to the terminals of the indicator through the specific resistance in series with the indicator. The test shall then be conducted at the specified test points of table I herein. The scale errors shall not
28、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25026C 5 exceed the tolerance specified. If greater overall indicator accuracy can be obtained by setting the pointer to 7005C with the specified voltage for 700C, the pointer shall be so posit
29、ioned. TABLE I Test Tolerances. Test Point (C) Scale Error at Room Temp ( C) Scale Error at Low Temp ( C) Scale Error at High Temp ( C) Scale Error at Room Temp After Vibration ( C) 0 60 (60) 75 (75) 70 (70) 75 (70) 200 40 (40) 55 (55) 50 (50) 55 (50) 400 30 (30) 45 (45) 40 (40) 45 (40) 500 20 (20)
30、35 (35) 30 (30) 35 (30) 600 10 (10) 25 (25) 20 (20) 25 (20) 700 5 (5) 20 (20) 15 (15) 20 (15) 800 10 (10) 25 (25) 20 (20) 25 (20) 900 20 (20) 35 (35) 30 (30) 35 (30) 1000 20 (20) 35 (35) 30 (30) 35 (30) Test Point (C) Extreme Low Temp Exposure Scale Error at Room Temp After High Temp ( C) Scale Erro
31、r at Room Temp After Salt Spray ( C) Scale Error at Low Temp ( C) Scale Error at Room Temp After Low Temp ( C) 0 90 (75) 80 (65) 80 (65) 80 (60) 200 70 (55) 60 (45) 60 (45) 60 (40) 400 60 (45) 50 (35) 50 (35) 50 (30) 500 50 (35) 40 (25) 40 (25) 40 (20) 600 40 (25) 30 (15) 30 (15) 30 (10) 700 35 (20)
32、 25 (10) 25 (10) 25 (5) 800 40 (25) 30 (15) 30 (15) 30 (10) 900 50 (35) 40 (25) 40 (25) 40 (20) 1000 50 (35) 40 (25) 40 (25) 40 (20) 4.3.1.2 Position error. The position errors of the indicator shall be conducted at any point on the scale between 400C and 900C by applying the test voltage and the ma
33、ximum change in indication shall not exceed 25C. 4.3.1.3 Friction error. The maximum difference in reading, before and after tapping, shall not exceed 30C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25026C 6 4.3.1.4 Zero adjustment. Powe
34、r shall be applied to produce a 700C reading. When the indicator zero adjustment is operated throughout its range, the resulting pointer motion shall not be less than 40C above and below the 700C reading. The total motion of the pointer shall not exceed 200C. The pointer shall be reset to the initia
35、l reading with the initial power applied. 4.3.1.5 Insulation resistance. The insulation resistance shall be a minimum of 20 megohms. 4.3.2 Sampling plan A tests. Testing shall be accordance with MIL-I-7071 sampling plan A tests. 4.3.2.1 Scale error at low temperature. The scale error shall not excee
36、d the tolerances specified in Table I when subjected to the test requirements of MIL-I-7071. If there is a tendency for the pointer to the stick to the pointer stops, a light tap on the indicator shall be sufficient to free the pointer. 4.3.2.2 Scale error at high temperature. The scale error shall
37、not exceed the tolerances specified in Table I when subjected to the test requirements of MIL-I-7071. If there is a tendency for the pointer to the stick to the pointer stops, a light tap on the indicator shall be sufficient to free the pointer. 4.3.2.3 Magnetic effect. When the indicator is subject
38、ed to the magnetic effect test of MIL-I-7071, the magnetic compass shall not deflect more than 5 degrees. 4.3.2.4 Vibration error. The indicators shall be subjected to the test requirements of MIL-I-7071. The maximum amplitude of pointer oscillation throughout the frequency range shall not exceed a
39、range of 20C within the temperature range of 400C to 900C and shall not exceed 30C for the remainder of the scale. The maximum difference between the original position of the pointer before vibration and the position of the pointer during vibration shall not exceed 15C between 400C and 900C and shal
40、l not exceed 25C for the remainder of the scale. Pointer oscillation shall not be considered as pointer variation. The diameter of the circular motion of vibration shall be 0.009 inches to 0.011 inches 4.3.2.5 Vibration failure. The scale errors at room temperature after this test, as specified of M
41、IL-I-7071, shall not exceed the tolerances specified in Table I. The zero adjustment shall not be reset after the vibration test. 4.3.2.6 Resistance. The resistance of the indicator shall not be less than 40 ohms. 4.3.3 Sampling plan B tests. Testing shall be accordance with MIL-I-7071 sampling plan
42、 B testing. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25026C 7 4.3.3.1 Cold junction compensator lag. The indicator shall be connected to a chromel-alumel thermocouple (8 ohms total external circuit resistance), immersed in an ice bath
43、of 0C, and a millivoltage of constant value applied in series with the indicator and thermocouple to provide reading of 700C. The indicator shall then be subjected to the conditions of the “Cold junction temperature lag” test specified in MIL-I-7071 for increasing and decreasing temperatures. The in
44、dication of the indicator throughout the test shall at no time vary by more than 30C from the indication obtained at room temperature. 4.3.3.2 Extreme low temperature exposure. The scale errors at low temperature, as specified in the “Extreme low temperature exposure” test of MIL-I-7071, shall not e
45、xceed the tolerances specified in Table I. The scale errors at room temperature after low temperature exposure shall not exceed the tolerances specified in Table I. 4.3.3.3 High temperature exposure. The scale errors at room temperature after high temperature exposure, as specified in the “High temp
46、erature exposure” test of MIL-I-7071, shall not exceed the tolerances specified in Table I. 4.3.3.4 Thermal shock. No damage to the indicator shall result from the thermal shock test when subjected to the requirements the “Thermal shock” test of MIL-I-7071. 4.3.3.5 Salt fog. The scale errors at room
47、 temperature after salt fog exposure, as specified in MIL-STD-810, Method 509, shall not exceed the tolerances specified in Table I. 5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel i
48、s to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained by the inventory control points packaging activities within the military service or defense agency
49、or within the military services system command. Packaging data retrieval is available from the managing military departments or defense agencys automated packaging files, CD-ROM products, or by contacting the responsible packaging activity. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not man
