1、piEGE5-j MILT-24388C(SH) 30 March 1990 SUPERSEDING 26 April 1979 (See 6.7) MIL-T-24388B (SH) MILITARY SPECIFICATION THERMOCOUPLE AND RESISTANCE TEMPERATURE DETECTOR ASSEMBLIES, GENERAL SPECIFICATION FOR (NAVAL SHIPBOARD) This specification is approved for. use by the Naval Sea Systems Command, Depif
2、ment of the Nniy, and is available for. me by all deparfinents and agencies of the Depai-hnent of Defense. 1. SCOPE 1.1 Scope. This specification covers environmentally hardened resistance thermometers and thermocouple sensors that transorm the surrounding thermal energy in a manner that can be clec
3、trically measured and converted to a temperature using a signal conditioner/temperatue monitor. Types o configurations covered in this specification are those which place the resistance thermometer or thermocouple sensor directly into the medium (bare bulb), into a thermowell, or embedded into a bea
4、ring. 1.2 classification. Resistance thermometers and thermocouple sensors shall be classified according to the allowing variables: Designation TY Pe Configiiration number (see 1.2.1) (see 1.2.2) (see 1.2.3) 1.2.1 Type. The type of resistance thermometer or thermocouple sensor shall be designated by
5、 one of the following three-letter symbols. Type Symbols Type K thermocouple sensor Resistance thermometer with nickel element Resistance thermometer with platinum element KTC NRT PRT Beneficial conirnents (reconinicndalioris, additions, deletions) and any pertinent data which may be of use in impro
6、ving this document should bc nddrcssed to: Commander, Navai Sea Systems Command, SEA 5523, Depart- ment of the Navy, Washington, DC 20302-5101, by using the self-addressed Standardization Document improve- nient Proposal (DD Forni 1420) appearing at the end of this document or by letter. AMSC N/A FS
7、C 6685 IISTRIUTION SIAIEMENI A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.2.2 Configuration, Type of configuration for which the resistance thermometer or thermocouple sensor is intended
8、 shall be designated by one of the following two-letter symbols. Type of configuration Symbols Thermowell Tw Bare bulb BB Embedded EM 1.2.3 Designation number. The designation number used to spec the sheath length and other applicable parameters within each type of configuration shall be denoted by
9、one or two numerals or by one or two numerals preceded by a letter found in one of the following: Type of configuration Table number Tw II III IV. BB EM + 2. APPLICABLE DOCUMENTS 2.1 Government documents, 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and ha
10、ndbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIF
11、ICATIONS FEDERAL PPP-F-320 Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes QQ-B-637 Brass, Naval: Rod, Wire, Shapes, Forgings, and Flat Products with Finished Edges (Bar, Flat Wire, and Strip) QQ-S-763 QQ-“-390 Steel Bars, Wire, Shapes, and Forgings, Corrosion Resisti
12、ng Tin Alloy Ingots and Castings and Lead lloy Ingots and Castings (Antifriction Metal) for Bearing Applications 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILITARY MIL-M- 14 MIL-S-901 MIL- W-5846 MIL-A-8625 MIL-T-10727 . MIL-P-15024 MIL-P- 15
13、024/5 MIL-W-16878 MIL-W- 16878125 MIL-E-17555 e- MIL-L- 19140 MILS22473 MIL-T-24270 MIL-T-28800 MIL-T-55164 MIL- W-8138 1 MIL- W-81381/12 Molding Plastics and MoIded Plastic Parts, Thermosetting Shock Tests, HI (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for . Wire, Elect
14、ric, Chrome1 and Alumel, Thermocouple Anodic Coating, for Aluminum and Aluminum Alloys Tin Plating; Electrodeposited or Hot Dipped, for Ferrous and Nonferrous Metals Plates, Tags, and Bands for Identification of Equipment Plales, Identification Wire, ElectricaI, Insulated, General Specification or W
15、ire, Electrical, Polytetrafluoroethylene (PTFE) Insulated, 260 “C, 600 Volts, Extruded Insulation Electronic and Electrical Equipment Accessories, and Provisioned Items (Repair Parts): Packaging of Lumber and Plywood, Fire-Retardant Treated Sealing, Locking, and Retaining Compounds: (Single Componen
16、t) Thermowells for Thermometers and Electrical Tempera ture Sensors, General Specification for Test Equipment for Use with Electrical and Electronic Equipment, General Specification for Terminal Boards, Molded, Barrier, Screw and Stud Types, and Associated Accessories, General Specification for Wire
17、, Electric, Polyimide-Insulated, Copper or Copper Alloy Wire, Electric, FIuorocarbon/Polyimide Insulated, Medium Weight, Nickel Coated Copper Conductor, 600 Volts, 200 “C, Nominal 8.4 or 15.4 MIL WALL 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
18、-STANDARDS . FEDERAL FED-STD-HZ8 MILITARY MIL-STD-108 MIL-STD-271 MIL-STD -278 MIL-STD-454 MIL-STD-735 MS 3102 MS 3106 Screw-Thread Standards for Federal Services Definitions o and Basic Requirements for Enclosures for Electric and Electronic Equipment Requirements for Nondestructive Testing Methods
19、 Welding and Casting Standard Standard General Requirements for Electronic Equipment Test Methods and Test Equipment for Thermometers Used in Machinery and Piping Systems Connector, Receptacle, Electric, Box Mounting, Solder Contacts, AN Connector, Plug, Electric, Straight, Solder Contacts, AN Type
20、(Unless and able to form a chemical bond with the connecting wires (thermowell configuration), electrical connector receptacle pins (bare bulb configuration), or the connecting wire insulation (embedded configuration) and with the sheath sufficient to meet the sealing requirements. The connecting wi
21、re end closure shall not contain a restricted material as specified in MILT-28800. The connecting wire end closure shall not chemically react, degrade, or outgas when subjected to the following: air, distilled water, sea water, salt, petroleum and silicone based oils, oil solvents, prolonged (greate
22、r than 1 month) periods of exposure to ambient temperatures, prolonged periods of exposure to elevated temperatures (up to 400 degrees Fahrenheit (OF), and exposure to prolonged cycling periods from ambient to elevated temperatures. A connecting wire and closure consisting of a ceramic-to-metal, or
23、a glass-to-metal seal shall also incorporate other characteristics to make it impenetrable to fluids, and shall be considered a hermetic sear. The connecting wire end closure shall meet ali the performance requirements specified in 3.7, including the connecting wire end closure requirement (see 4.9)
24、. 3.3.1.2 Fungus-inert materials. Materials which provide a nutrient medium for fungus and insects shall not be used in the construction of any resistance thermometer or thermocouple sensor. Fungus-inert materials shall be in accordance with requirement 4 of MIL-STD-454. 3.3.2 Recovered materials. U
25、nless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “r
26、ecovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specifica
27、tion. 3.3.3 Restricted materials. The resistance thermometers and thermocouple sensors shall not contain a restricted material as defined in MIL-T-28800. In addition cadmium or cadmium plated parts shall not be used. 3.4 Methods of attachment. 3.4.1 Welding. Welding shall be performed in accordance
28、with MIL-STD-278. The gas tungsten arc welding process shall be utilized except for forming the thermocouple measuring junction. 3.4.2 Brazing. Brazing shall be performed in accordance with NAVSEA 0900-LP-00-7OOO. Brazing is prohibited where the design temperature exceeds 425 OF. 3.4.3 Threads. Thre
29、ads shall be in accordance with FED-STD-H28. 3.4.4 Fastening devices. Screws, pins, bolts, and similar parts shall be installed with means for preventing loss of tightness. These parts, when subject to removal or adjustment, shall not be swaged, peened, stacked, or otherwise permanently deformed. 9
30、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2LI3C bb M 77777Ob 042L7 T 3.5 Construction. 3.5.1 Description. Resistance thermometers and thermocouple sensors are shown on figures 1 through 6. Resistance thermometer and thermocouple sensor co
31、nstruction dimensions and application temperatures for thermowell, bare bulb, and embedded configurations shall be in accordance with tables 11, III, and IV respectively. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2438C bb 7777706 04283
32、90 b ti ?- I ti Q 1 tl I- MIGT-243 88C( SH) 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24388C(SH) TABLE III. Construction dimensions and application temperatures, bare bulb configuration. t TYP NRT NRT PRT KTC Temperature Designation ra
33、nge number (“F) El Minus 40 to 400 Designation number B1 B2 B3 B4 B5 B6 Size (see figure 5) (inch Ohms 184.94 189.81 194.75 199.75 204.83 209.97 215.18 220.46 225.82 231.24 236.74 242.32 247.96 253.69 259.48 265.36 271.32 277.35 283.46 289.66 295.93 302.29 308.73 Resistance thermometers with nickel
34、elements shall not be used for temperature applications above 400 OF. TABLE Vi. Temperature versus resistance characteristics for Temperature Minus 40 Minus 20 O 20 32 40 60 80 100 120 140 160 180 200 212 220 260 (“F) resistance themorneter with platinum elements. Ohms 83.97 88.44 92.90 97.34 100.00
35、 101.77 106.18 110.58 114.96 119.33 123.69 128.03 132.35 136.67 139.24 140.96 149.51 Temperature (“FI - - 500 520 540 560 580 600 620 640 660 680 709 720 740 760 780 Ohms - - 199.58 203.66 207.72 211.77 215.81 219.83 223.83 227.82 231.80 235.76 239.71 243.64 247.56 251.46 255.35 13 Provided by IHSNo
36、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-243C bb W 777770b 0428193 1 M MIL-T-24388C(SH) TABLE Vi. Temperature versus resistance characteristics for resistance themorneter with platinum elements - Continued. Temperature (“FI 280 300 320 . 340 360 380 400
37、420 440 460 480 Ohms 153.76 158.00 162.22 166.43 170.63 174.81 178.97 183.12 187.25 191.38 195.49 Temperature (“F) 800 820 840 860 880 900 920 . 940 960 980 - 1000 Ohms 3.5.2.2 Thermocouple. (See 6.5.10 and 6.5.28.) 3.5.2.2.1 Location. The thermocouple measuring junction shall be ungrounded and loca
38、ted within the bottom 1/4 inch of the sheath for the thermowell and bare bulb configurations. The thermocouple measuring junction shall be ungrounded and located in the middle of the sheath for the embedded configuration. 3.5.2.2.2 Method of attachment. The thermocouple measuring junction shall be f
39、ormed by inert gas fusion welding (see 3.4.1). 3.5.2.23 Temperature versus electromotive force. The relationship for the type K thermocouple temperature versus electromotive force relationship shall be in accordance with either MIGW-5846 or the NBS Monograph 37. 3.53 Connecting wires. The diameter o
40、f the connecting wire shall be the AWG as specified in table I. The connecting wire material shall also be in accordance with table I. 3.5.3.1 Resistance thermometers. 3.53.1.1 External insulation (TW and EM configurations), The material for the external insulation shall be as specified in table I.
41、3.53.1.1.1 Color code. The external insulation for the single connecting wire attached to one end of the resistance thermometer element shall be color coded red. The external insulation for the two connecting wires attached to the other end of the resistance thermometer element shall be color coded
42、white. 259.23 263.09 266.93 270.77 274.58 278.39 282.17 285.95 289.71 293.45 297.18 3.53.1.2 Internal insulation (TW and BI3 configiiration). The resistance thermometer connecting wires shall be insulated from the sheath and from each other by alumina (Alzo3). The alumina shall be alpha alumina with
43、 a minimum content of 99.5 percent alumina. Sulfur shall not exceed 50 parts per million (ppm) while carbon shall not exceed 200 ppm. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-243C bb 9999906 042L9Li 3 M 3.53.13 Number of connecfing wi
44、res. The resistance thermometers shall be of three-wire construction except for the bare bulb configuration with a nickel element which shall be of two- wire construction. 3.5.3.2 Thermocouple sensors. 3.5.3.2.1 External insulating (TW and EM configurations). The material for the external insulation
45、 shall be as specified in table I. 3.5.3.2.1.1 Color code. The external insulation for the positive (chromel) connecting wire shall be yellow. The external insulation for the negative (alumel) connecting wire shall be red. 3.5.3.2.2 Internal insulation (TW and BB configurations). The thermocouple se
46、nsor connecting wires shall be insulated from each other, except at the measuring junction, and from the sheath by magnesia (MgO). The magnesia shall be electrically fused with a 96.5 percent minimum content of magnesia. The sulfur content shall be less than 50 ppm and the carbon content less than 2
47、00 ppm. 3.5.4 Thermowell configuration. 3.5.4.1 Temperature exposures, Maximum connecting head temperature shall be 300 OF for resistance thermometers with nickel elements, 500 OF for resistance thermometers with platinum elements, and 500 OF for type K thermocouple sensors. 3.5.4.2 Watertight enclo
48、sure. Resistance thermometers and thermocouple sensors shall be watertight as specified in MIL-STD-108 (see 4.9.9). 3.5.43 Construction. Thermowell configuration shall consist of resistance thermometer or thermocouple sensor, connection head, and a connection head extension as shown on figures 1 thr
49、ough 4. 3.5.43.1 Connection head cap. The connection head of the thermowell configuration shali be provided with a screw-on type cap with a metal link chain, 3543.2 Terminal board. Terminal board shall be secured to the connection head by two or more machine screws. 3.5.4.4 Thermowells. When resistance thermometers and thermocouple sensors are intended for use with thermowells, the thermowells
