1、Comments, suggestions, or questions on this document should be addressed to 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 this address information using the ASSIST
2、database at https:/assist.dla.mil/. AMSC N/A FSC 6685 INCH-POUND MIL-DTL-25446E 21 June 2012 SUPERSEDING See 6.4 DETAIL SPECIFICATION TRANSMITTER, TEMPERATURE, ELECTRICAL RESISTANCE, ARMORED, BAYONET LOCKING TYPE, (-50 C TO 300 C) Inactive for new design after 24 November 1997. This specification is
3、 approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for flexible sheath, electrical resistance-type, cylinder head temperature transmitters. 1.2 Classification. The temperature transmitters shall be classified
4、 as specified below (see 6.2): MS24482-1 - 2.850-inch stem length MS24482-2 - 2.203-inch stem length 1.3 Part or identifying number (PIN). The PIN to be used for temperature transmitters acquired to this specification is created as follows. Legacy part numbers have been retained to support continued
5、 procurement: M 24482 - X Example: M24482-2 Size: 1 - 2.850-inch stem length 2 - 2.203-inch stem length Specification number Denotes military specification Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25446E 2 2. APPLICABLE DOCUMENTS 2.1 G
6、eneral. 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 the complet
7、eness 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. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards f
8、orm 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. DEPARTMENT OF DEFENSE SPECIFICATIONS QQ-B-654 - Brazing Alloys, Silver AN5539 - Terminal - Thermocouple, Brass MIL-STD-31000 - Techni
9、cal Data Packages DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 - Dissimilar Metals (Copies of these documents are available online at https:/assist.dla.mil/ or fr
10、om the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other government document. The following other government document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents
11、are those cited in the solicitation or contract. OTHER GOVERNMENT DOCUMENT SD-6 - Provisions Governing Qualification (Copies of this document are available online at https:/assist.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
12、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25446E 3 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 thos
13、e cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies of this document are available online from http:/www.asq.org/ or American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.)
14、 ASTM INTERNATIONAL ASTM A581/A581M - Standard Specification for Free-Machining Stainless Steel Wire and Wire Rods ASTM E220 - Standard Test Method for Calibration of Thermocouples By Comparison Techniques ASTM E230 - Standard Specification and Temperature-Electromotive Force (emf) Tables for Standa
15、rdized Thermocouples (Copies of these documents are available online at http:/www.astm.org/ or from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.) SAE INTERNATIONAL SAE-AMS-S-7720 - Steel, Corrosion-Resistant (18-8) Bars, Wire and Forging Stock (Aircraft
16、 Quality) (Copies of this document are available online at http:/www.sae.org or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 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
17、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 Qualification. The temperature transmitters furnished under this specification shall b
18、e products that are authorized by the qualifying activity for listing on the applicable qualified products list (QPL) before contract award (see par 4.2, 6.2, and 6.3). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25446E 4 3.1.1 Maintenanc
19、e of qualification. At specified intervals determined by the qualifying activity, the manufacturer must be able to demonstrate that the company still has the capabilities and facilities necessary to produce the QPL items in accordance with this specification and in accordance with the provisions gov
20、erning qualification specified in SD-6. 3.2 Parts. 3.2.1 Commercial parts. Commercial parts having suitable properties may be used where, on the date of invitation for bids, there are no suitable standard parts. In any case, commercial utility parts, like screws, bolts, nuts, and cotter pins, having
21、 suitable properties may be used provided: a. They can be replaced by MS or AN standard parts without alteration. b. The corresponding standard part numbers are referenced in the parts list and, if practical, on the contractors drawings. 3.2.2 Standard parts. With the exception in 3.2.1, MS and AN s
22、tandard parts shall be used where they suit the purpose. They shall be identified on the drawings by their part number (see figure 1 and table I). 3.3 Materials. Materials that are not covered by applicable specifications shall be of the best commercial quality, of the lightest practicable weight, a
23、nd entirely suitable for the purpose (see figure 1). Nonflammable materials shall be used in the construction of the transmitter. 3.3.1 Corrosion resistance. Materials shall be of corrosion-resistant types or shall be suitably protected to resist corrosion. 3.3.2 Dissimilar metals. Unless suitably p
24、rotected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact. Dissimilar metals are defined in MIL-STD-889. 3.3.3 Toxic and corrosive fumes. The materials used in the construction of the temperature transmitter shall not release gases which combine with the atmosp
25、here to form acids or corrosive alkalis, nor shall they release toxic fumes when burned. 3.3.4 Fungus-inert materials. Materials that are not nutrients for fungi shall be used to the greatest extent practicable. Where materials that are nutrients for fungus must be used, such materials shall be trea
26、ted with a fungicidal agent, as approved by the procuring activity (see 6.2). Materials that are fungal nutrients and that are contained within a hermetically sealed enclosure need not be treated with a fungicide. Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
27、rom IHS-,-,-MIL-DTL-25446E 5 NOTES 1. All dimensions are in inches. 2. Unless otherwise specified, tolerances: 2 decimal places: 0.02; 3 decimal places: 0.010; angles: 1. 3. Overall length: 15.00 0.50 from tip of bulb to disconnect assembly on longest lead. 4. Silver braze: QQ-B-654, grade IV. 5. St
28、eel stem: SAE AMS-S-7720, UNS S30200, or S31600. 6. Flexible conduit armor (shown) or braided sheath: Stainless steel, UNS S30200. 7. Silver braze wires to terminals using QQ-B-654, grade IV. 8. Slot to pass freely around 0.135 locking pin. Break sharp edges of slot. 9. Steel cap: SAE AMS-S-7720, UN
29、S S30200 or S31600, or ASTM A581/A581M, UNS S41600. FIGURE 1. Transmitter; temperature, electrical resistance, (-50 C to 300 C). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25446E 6 TABLE I. Transmitter; temperature, electrical resistance
30、, (-50 C to 300 C) - dimensions. 3.3.5 Protective treatment. When materials are used in the construction of the transmitters that are subject to corrosion in salt air or other atmospheric conditions likely to occur during service use, they shall be protected against such corrosion in a manner that w
31、ill in no way prevent compliance with the performance requirements of this specification. The use of any protective coating that is subject to cracking, chipping, or scaling with age or extremes of atmospheric conditions shall be avoided. 3.3.6 Recycled, recovered, or environmentally preferable mate
32、rials. 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. 3.4 Design and construction. The tempe
33、rature transmitter shall conform to the requirements contained herein and shall be constructed to withstand the normal strains or jars, vibrations, and such other conditions incident to shipping, storage, installation, and service without failure. 3.4.1 Temperature range. The temperature transmitter
34、 shall be designed to function satisfactorily throughout the temperature range -50 C to 300 C (-58 F to 572 F). 3.5 Performance. The temperature transmitter shall be capable of meeting the test requirements specified in section 4 when subjected to the following conditions: a. Temperature: Temperatur
35、es ranging from -65 C to 325 C (-85 F to 617 F). b. Insulation resistance: Satisfactory insulation resistance when a potential of 100 volts direct current (VDC) is applied between the connector terminals and any metal part of the transmitter. c. Vibration: Vibration testing when performed in accorda
36、nce with MIL-STD-810, section 514, category 8. Fi= 350 Hertz. d. Humidity: Relative humidity up to 100 percent. e. Fungus: Fungus growth as encountered in tropical climate. f. Salt spray: Exposure to salt sea atmosphere. g. Spring load: The applied spring load causing the distance between the temper
37、ature transmitter tip and the cap-base to be a distance of 2.5 inches for the MS24482-1, and 2.0 inches for the MS24482-2 shall be 2.5 pounds or greater. 3.6 Interchangeability. All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. The drawing n
38、umber requirements of MIL-STD-31000 shall govern changes in the manufacturers part numbers. MS part no. A B C Min D Max E Max MS24482-1 2.850 0.030 2.50 2.62 1.78 1.00 MS24482-2 2.203 0.016 2.00 2.06 1.63 0.76 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
39、IHS-,-,-MIL-DTL-25446E 7 3.7 Insulation. The wires and insulation outside of the temperature transmitter stem shall be protected by a suitable insulation to resist deterioration from oil, engine cleaning fluids, and heat. The lead wires shall be constructed of flexible stranded wire. A stainless ste
40、el flexible sheath or conduit shall be used to protect the leads between the temperature transmitter stem and the metal clamp as indicated in figure 1. 3.8 Resistance element. The resistance element of the temperature transmitter shall be properly sealed within the temperature transmitter housing to
41、 withstand total immersion of the transmitter housing in a liquid bath. 3.9 Temperature-resistance characteristics. The temperature-resistance characteristics of the temperature transmitter shall conform to the values shown in table II. TABLE II. Temperature-resistance characteristics for cylinder h
42、ead transmitter. Temperature C Resistance Ohms () Tolerance Temperature C Resistance Tolerance -50 37.95 -0.60 / +1.80 130 89.20 0.60 -40 40.15 -0.60 / +1.70 140 92.80 0.60 -30 42.45 -0.60 / +1.60 150 96.50 0.70 -20 44.85 -0.60 / +1.50 160 100.30 0.70 -10 47.35 -0.60 / +1.40 170 104.20 0.70 0 50.00
43、-0.50 / +1.35 180 108.20 0.70 10 52.60 -0.50 / +1.33 190 112.30 0.70 20 55.25 -0.50 / +1.30 200 116.50 0.80 30 57.95 -0.50 / +1.27 210 120.80 0.80 40 60.70 -0.50 / +1.24 220 125.20 0.80 50 63.55 -0.60 / +1.20 230 129.70 0.80 60 66.50 -0.60 / +1.17 240 134.30 0.80 70 69.55 -0.60 / +1.17 250 139.00 0.
44、90 80 72.65 -0.60 / +1.15 260 143.80 0.90 90 75.80 -0.60 / +1.15 270 148.75 0.90 100 79.00 -0.60 / +1.10 280 153.85 0.90 110 82.30 0.60 290 159.10 0.90 120 85.70 0.60 300 164.50 1.00 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25446E 8 3.
45、10 Electrical connection. The temperature transmitter shall be provided with electrical connection terminals as shown in figure 1 and specified in AN5539-2. 3.11 Weight. The weight of the complete temperature transmitter shall not exceed 0.20 pounds. 3.12 Identification of product. Equipment, assemb
46、lies, and parts shall be marked for identification in accordance with MIL-STD-130 and shall include the PIN number (see 1.3) and the contractors part number. 3.13 Workmanship. The temperature transmitter shall be constructed and finished in a thoroughly workmanlike manner. Particular attention shall
47、 be given to neatness and thoroughness of soldering, impregnation, and brazing, and freedom of parts form burrs and sharp edges. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2). b. Confor
48、mance inspection (see 4.3). 4.2 Qualification inspections. 4.2.1 Qualification test samples. The qualification test samples shall consist of three transmitters. Samples shall be identified with the manufacturers own part number and any additional information required in the purchase order or by the
49、contracting activity (see 6.2). 4.2.2 Qualification required. Prior to actual procurement, the product which this specification covers shall pass the qualification tests specified herein. If the product is later modified in any way, the modified form shall be subjected to and shall pass the same qualification tests. 4.2.3 Qualifica
