1、 MIL-DTL-5846D 1 April 2008 Superseding MIL-W-5846C 5 October 1973 DETAIL SPECIFICATION CHROMEL AND ALUMEL THERMOCOUPLE ELECTRICAL WIRE AMSC N/A FSC 6145 DISTRIBUTION STATEMENT A: Approved for public release, distribution is unlimited. INCH-POUND Comments, suggestions, or questions concerning this d
2、ocument should be addressed to AMSRD-AMR-SE-TD-ST Redstone Arsenal, AL 35898-5000 or e-mailed to malinda.allcorn1us.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Provided
3、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 21.SCOPE 1.1 Scope. This specification covers chromel and alumel thermocouple wire (see 6.5). 1.2 Classification. The thermocouple wire shall be of the following types and classes: Type 1 Solid and
4、 stranded conductor Class A Bare (solid conductor) Class B Insulated (solid conductor) Class C Insulated duplex (solid conductor) Class D Insulated (stranded conductor) Class E Insulated duplex (stranded conductor) Type 2 Insulated duplex, stranded conductor (7 ohms per 25 feet) Class A Stranded ins
5、ulation Type 3 Insulated duplex, stranded conductor (7 ohms per 50 feet) Class A Stranded insulation Type 4 Insulated duplex, stranded conductor (7 ohms per 100 feet) Class A Stranded insulation 1.2.1 Military part number. The military part number shall consist of the letter “M,” the basic number of
6、 the specification, and an assigned dash number as shown below. Information to be inserted shall be derived from 1.2 above and Table I. M 5846-1 A 1/14 -A* Military Specification Type Class Number of Conductor designator number number conductors material and wire size * For single conductor wire the
7、 wire material shall follow the wire size preceded by a dash. A=Alumel. C=Chromel. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specificati
8、on or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are
9、cited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 32.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specifie
10、d herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS TT-I-735 - Isopropyl Alcohol COMMERCIAL ITEMS DESCRIPTIONS A-A-52624 - Multi-engine Type Antifreeze DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-12000 - Packaging of
11、 Electric Cable, Cord, and Wire STANDARDS MIL-STD-120 - Marking for Shipment and Storage MIL-STD-130 - Identification Marking of US Military Property MIL-STD-810 - Environmental Test Methods (Copies of these documents are available from the Standardization Document Order Desk, 700 Robbins Avenue, Bu
12、ilding 4D, Philadelphia, PA 19111-5094, or online at http:/assist.daps.dla.mil/quicksearch/.) 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 solicit
13、ation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D471 - Rubber Property Effects of Liquids (Copies of this document are available from American Society for Testing and Materials, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, or online at http:/www.a
14、stm.org). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 4SOCIETY OF AUTOMOTIVE ENGINEERS, INC. (SAE) SAE J1966 - Aircraft Piston Engine (Nondispersant Mineral) Lubricating Oils (Copies of this document are available from Society of Au
15、tomotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096-0001, or online at http:/www.sae.org.) 3. REQUIREMENTS 3.1 Preproduction. Unless otherwise specified, preproduction inspection is required and preproduction samples shall meet the requirements specified herein (see 6.2.1). 3.2 Ma
16、terial. Reclaimed materials shall be required to the maximum extent possible without jeopardizing the intended use of the item. 3.3 Construction. The wire shall be constructed as follows: Type 1 Class A Bare solid chromel or alumel conductor Type 1 Classes B and D First Solid or stranded chromel or
17、alumel conductor Second Inner wrap (if required) Third Primary insulation Fourth Layer of braid, fibrous covering or other approved material (if required) Fifth Outer protective coating (if required) Type 1 Classes C and E First Solid or stranded chromel and alumel conductors Second Inner wrap (if r
18、equired) (individual conductors) Third Primary insulation (individual conductors) Fourth Layer of braid, fibrous covering or other approved material (if required) (individual conductors) Fifth Chromel and alumel insulated wires laid in parallel and covered with duplexing outer coating Sixth Outer pr
19、otective coating (if required) Types 2, 3, and 4 Class A First Stranded chromel and alumel conductors Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 5Second Inner wrap (if required) (individual conductors) Third Primary insulation (ind
20、ividual conductors) Fourth Layer of braid, fibrous covering or other approved material (if required) (individual conductors) Fifth Chromel and alumel insulated wires laid in parallel and covered with duplexing outer covering Sixth Outer protective coating (if required) 3.3.1 Conductors. 3.3.1.1 Meta
21、ls. The conductors shall consist of chromel or alumel as specified herein and shall be of such quality as to produce the characteristics specified herein. The conductors shall be free from lumps, kinks, splits, abrasions, and scraped or corroded surfaces. 3.3.1.2 Stranding. Stranding may be bunched,
22、 concentric or rope lay and as specified in Table I. The wire sizes of all strands shall be the same for any one conductor except for Types 2, 3, and 4, where strand size may vary to facilitate resistance adjustments. TABLE I. Details of wire construction. Type Class American Wire Gage Nominal Condu
23、ctor Diameter (inches) Nominal Conductor Area (circular mils) Maximum Diameter of Finished Wire (inches) Number of Strands (min) Weight Lb (max) 1 A 14 16 18 20 26 0.0641 0.0508 0.0403 0.0320 0.0159 4107 2583 1624 1021 254 1 B 14 16 18 20 26 0.0641 0.0508 0.0403 0.0320 0.0159 4107 2583 1624 1021 254
24、 0.150 0.130 0.115 0.110 0.070 1 C (See Note 1) 14 16 18 20 26 0.0641 0.0508 0.0403 0.0320 0.0159 4107 2583 1624 1021 254 0.315 0.275 0.245 0.225 0.155 1 D 14 16 18 20 24 26 0.080 0.063 0.048 0.039 0.025 0.020 4107 2583 1624 1021 404 254 0.170 0.150 0.135 0.115 0.090 0.075 9 8 7 4 3 3 Provided by IH
25、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 6TABLE I. Details of wire construction Continued. Type Class American Wire Gage Nominal Conductor Diameter (inches) Nominal Conductor Area (circular mils) Maximum Diameter of Finished Wire (inches) Numb
26、er of Strands (min) Weight Lb (max) 1 E (See Note 1) 14 16 18 20 24 26 0.080 0.063 0.048 0.039 0.025 0.020 4107 2583 1624 1021 404 254 0.355 0.305 0.275 0.245 0.195 0.165 9 8 7 4 3 3 2 A (See Note 1) 16 (See Note 2) Resistance per 25 feet of duplex wire = 7.00 +0.00. -0.80 ohms at +25 C 0.295 9-chro
27、mel 5-alumel 1.0/25 feet 3 A (See Note 1) 13 (See Note 2) Resistance per 50 feet of duplex wire = 7.00 +0.00. -0.80 ohms at +25 C 0.330 18-chromel 9-alumel 3.0/50 feet 4 A (See Note 1) 10 (See Note 2) Resistance per 100 feet of duplex wire = 7.00 +0.00. -0.80 ohms at +25 C 0.400 35-chromel 18-alumel
28、 10.0/100 feet Note 1. Type 1, Classes C and E, and Types 2, 3, and 4 are duplex (two conductor) wire. Note 2. Sizes shown are approximate to facilitate part numbering. 3.3.1.3 Electromotive force. The temperature-electromotive force relationship of the chromel and alumel conductors forced together
29、as a thermocouple shall conform to requirements in Table II within the tolerances listed in Table III. (see 4.3.2) 3.3.1.4 Splices. Splices in individual strands of a stranded conductor shall be of the butt type. Splices in strands which are composed of a group of individual strands shall be of the
30、butt type. Butt type splices shall be brazed with silver solder. Splices shall be so constructed and disposed throughout the conductor that the diameter, configuration, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 7conductor resistan
31、ce, flexibility, and mechanical strength of the completed conductor are not adversely affected. TABLE II. Corresponding values of temperature and electromotive force, reference junction temperature of 0C. Temperature C F Electromotive Force MV Temperature C F Electromotive Force MV Temperature C F E
32、lectromotive Force MV -100 -148 -90 -130 -80 -112 -70 -94 -60 -76 -50 -58 -40 -40 -30 -22 -20 -4 -10 +14 0 32 +10 50 20 68 30 86 40 104 50 122 60 140 70 158 80 176 90 194 100 212 110 230 120 248 130 266 140 284 150 302 160 320 170 338 180 356 190 374 200 392 210 410 220 428 230 446 240 464 250 482 2
33、60 500 -3.19 -3.19 -2.87 -2.55 -2.21 -1.86 -1.50 -1.14 -0.77 -0.39 0.00 +0.40 0.80 1.20 1.61 2.02 2.43 2.85 3.26 3.68 4.10 4.51 4.92 5.35 5.73 6.13 6.53 6.93 7.33 7.73 8.13 8.53 8.93 9.34 9.74 10.15 10.56 270 518 280 536 290 554 300 572 310 590 320 608 330 626 340 644 350 662 360 680 370 698 380 716
34、 390 734 400 752 410 770 420 788 430 806 440 824 450 842 460 860 470 878 480 896 490 914 500 932 510 950 520 968 530 986 540 1004 550 1022 560 1040 570 1058 580 1076 590 1094 600 1112 610 1130 620 1148 630 1166 10.97 11.38 11.80 12.21 12.62 13.04 13.45 13.87 14.29 14.71 15.13 15.55 15.97 16.40 16.82
35、 17.24 17.65 18.08 18.50 18.93 19.36 19.78 20.21 20.65 21.07 21.49 21.92 22.34 22.77 23.20 23.62 24.05 24.48 24.91 25.33 25.75 26.18 640 1184 650 1202 660 1220 670 1238 680 1256 690 1274 700 1292 710 1310 720 1328 730 1346 740 1364 750 1382 760 1400 770 1418 780 1436 790 1454 800 1472 810 1490 820 1
36、508 830 1526 840 1544 850 1562 860 1580 870 1598 880 1616 890 1634 900 1652 910 1670 920 1688 930 1706 940 1724 950 1742 960 1760 970 1778 980 1796 990 1814 1000 1832 26.60 27.03 27.45 27.87 28.29 28.72 29.14 29.56 29.98 30.40 30.82 31.23 31.65 32.07 32.48 32.90 33.30 33.71 34.12 34.53 34.94 35.35 3
37、5.76 36.16 36.56 36.96 37.36 37.76 38.16 38.56 38.96 39.35 39.75 40.14 40.53 40.92 41.31 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 8TABLE III. Electromotive force tolerance. Type Class Temperature Range Tolerance 1 2, 3 and 4 A, B
38、, C D, and E A 0 C to 350 C 350 C to 1000 C 0 C to 300 C 2.8 C 0.75 Percent 4.0 C 3.3.1.5 Size. The area of the conductors for Type 1 shall be as specified in Table I. The area of the conductor shall not exceed 5 percent under or 5 percent over the nominal value specified. 3.3.2 Insulation. The wire
39、 insulation shall consist of a concentric layer or layers of suitable materials, capable of meeting the requirements specified herein. The insulation shall be readily removed with the conventional wire stripping machine and shall have a uniform surface and cable diameter. 3.3.2.1 Inner wrap. The inn
40、er wrap, if used, shall consist of a suitable material which shall be braided, woven, or wrapped tightly about the stranded conductor and be capable of meeting the requirements specified herein. The material shall not cause corrosion of the conductor when subjected to the temperature requirements of
41、 this specification. 3.3.2.2 Primary insulation. Each conductor shall have a primary insulation consisting of a concentric layer of glass fibers or a multiple layer wrap of a suitable synthetic resinous tape, or other material capable of meeting the requirements specified herein. Where a fibrous pri
42、mary insulation is used, the material shall be impregnated with a silicone resin or other suitable compound and so applied that it will not enter the conductor strands and affect good electrical contact. The impregnation compound shall bond the insulation sufficiently to prevent fraying under normal
43、 conditions of installation. 3.3.2.3 Covering (individual conductors). 3.3.2.3.1 General. The covering, if used, shall consist of a braid, fibrous covering, or other approved material placed over the primary insulation. The covering shall be saturated with a non-hygroscopic and flame-retardant compo
44、und which will not affect the colors of the braid to such an extent that the colors cannot be easily distinguished. The saturating compound shall bond the covering sufficiently to prevent fraying under normal conditions of installation. 3.3.2.3.2 Color. The insulation of thermocouple wire shall be c
45、olor coded to indicate the metallic composition and polarity of the wires. 3.3.2.4 Duplexing outer covering. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5846D 93.3.2.4.1 General. Each duplex wire shall have an individual insulated chromel
46、 and alumel conductor laid side by side and covered with a tightly woven braid of glass fiber or other suitable material. 3.3.2.4.2 Color. The duplexing outer braid of the wire shall be color coded in accordance with Tables IV, V, and VI below. TABLE IV. Insulation color code for single*, duplex, an
47、d extension thermocouple wires. Metallic Composition Color code Positive Negative Iron (+) Constantan (-) Copper (+) Constantan (-) Chromel (+) Alumel (-) Black Yellow Red Yellow White Green *For single thermocouple wires, the individual insulated wire shall be color coded as indicated above, based on the metallic composition and polarity specified, i.e., iron (+) = black, alumel (-) = green. TABLE V. Jacket color code for duplex thermocouple wires. Metallic Composition Color code Overall
