1、IINCH-POUND! MIL-HDBK-298(SH) 30 September 1988 MILITARY HANDBOOK SELECTION, INSTALLATION AND TROUBLESHOOTING OF RESISTANCE THERMOMETERS AND THERMOCOUPLE SENSORS -THIS DOCUMENT CONTAINS 49 PAGES, . AMSC N/A FSC 6685 - DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
2、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-30 September 1988 2. Department o the Navy, and is available for use by all Departments and Agencies of the Department of Defense. This Military Handbook is approved for use by Naval Sea Systems Command
3、, FOREWORD 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standa
4、rdization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by latter 3. necessitate that fleet personnel have the knowledge and experience in the troubleshooting, selection, and replacement of both the monitoring system (which includes an analog or digital displa
5、y) and the sensing device (thermocouple sensor or resistance thermometer). monitoring system is covered by the applicable technical manual, was developed to guide the user in the selection, installation and trouble- shooting of thermocouple sensors and resistance thermometers. Problems occur with sh
6、ipboard temperature measurement instrumentation which The troubleshooting and replacement of the This handbook ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . L MIL-HDBK-27 66 W 7777770 OOLLbOL 4 M .Paragraph 1 . 1.1 1.2 2 . 2.1 2.1.1 2.1.2 2.
7、2 3 . 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 MIL-HDBK-298(SH) 30 September 1988 CONTENTS SCOPE . Scope Classification . APPLICABLE DOCUMENTS Government documents . Specifications
8、 . Other Government publication . Order of precedence DEFINITIONS . Alumel . Assembly. thermocouple sensor or resistance thermometer Boss. thermowell . Calibration Chrome1 Connecting wire end closure (thermowell Connecting wires. resistance and bare bulb configurations) . Connecting wires. thermocou
9、ple sensor thermometer . Connection head Connection head extension Contact. electrical Decade box . Double foot Double reversal Electrical connector . Electrical interference Electrical leakage . Electromotive force Element. resistance thermometer Element. thermocouple sensor . Error. zero adjustmen
10、t Extension wire Gasket . Gauge Grommet Ground . Ground loops . Hermetic seal Immersion depth. minimum. instrumentation Immersion depth. instrumentation . Immersion depth. thermowell Insertion length. instrumentation Insertion length. thermowell . Insulation. sheath. interior . iii Page 1 1 1 1 1 1
11、2 -2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-298 hb 9999970 O011603 L - .
12、 4 Paragraph 4.1.1.2 4.1.2 4.1.2.1 4.1.3 4.1.3.1 4.1.3.2 4.1.3.3 4.1.4 4.1.4.1 4.1.4.2 4.1.4.3 4.1.5 4.1.5 4.1.6.1 4.1.6.2 4.1.6.3 4.2 4.2.1 4.2.2 4.2.3 4.2.3.1 4.2.3.2 4.2.4 4.2.4.1 4.2.4.2 4.2.4.3 4.2.5 4.2.5.1 4.2.5.1.1 4.2.5.2 4.2.6 4.2.7 4.2.8 4.2.8.1 4.2.8.2 4.2.9 5 . 5.1 5.2 5.2.1 5.2.2 5.2.3
13、 5.2.4 5.2.5 MIL-HDBK-298(SH) 30 September 1988 CONTENTS . Continued Page Platinum and nickel resistance elements 9 Thermocouple sensors 9 Type K thermocouples 9 . . Extension wire . 10 Minimum wire gauges 10 Thermocouple monitoring systems 10 Resistance thermometer monitoring systems 10 Extension w
14、ire cable . 10 General requirements . LO Type K thermocouple sensors 11 Platinum and nickel elements . 12 Electrical connectors 12 Configurations . 13 Thermowell configuration . 13 Bare bulb configuration 13 Embedded configuration . 13 Pre-installation considerations 13 Extension wire runs 14 Laggin
15、g and insulation . 14 Thermocouple sensor assembly . 14 Resistance thermometer assembly . 14 Immersion depth 14 Thermocouple sensor 14 Resistance thermometer . 15 Thermowell . 15 On-site accuracy verification 15 Thermocouple sensor 15 In-place check . 16 Resistance thermometers 16 Calibration 16 The
16、rmocouple sensor or resistance Continuity check . 14 thermometer removal from the piping system 16 Electrical interference 16 Causes of electrical interference 16 Guidelines for reducing e1ectri;cal interference 17 Tools and test equipment . 18 DETAILED REQUIREMENTS . 20 Installation of extension wi
17、re and cable entrances . 20 Extension wire runs 20 Extension wire length . 20 Securing extension wires . 20 Marking 20 Grounding 20 Cable clamps . 21 V Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Paragraph 5.2.6 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.4 5.
18、4.1 5.4.2 5.5 5.5.1 5.5.2 5.5.3 5.5.4 5.5.5 5.6 5.6.1 5.6.1.1 5.6.1.2 5.6.1.3 5.6.1.4 5.6.1.4.1 5.6.1.4. 1 . 1 5.6.1.4.1.2 5.6.1.4.2 5.6 A4.3 5.6.1.5 5.6.1.5.1 5.6.1.5.2 5.6.2 5.6,2.1 5.6.2.2 5.6.2.3 MIL-HDBK-298(SH) 30 September 1988 CONTENTS . Continued Page Use of steel stuffing tube . 21 Termina
19、l board and electrical connector installations . 21 Thermowell and embedded type K thermocouple sensors 21 Bare bulb type K thermocouple sensor . 21 Thermowell and embedded resistance thermometers 21 Bare bulb resistance thermometers 22 Cable entrances 22 Installation of nylon stuffing tube 22 Insta
20、llation of an electrical connector 23 Installation of thermocouple sensors and resistance thermometers . 24 Tools, materials. and test equipment . 24 Thermowell configuration procedure . 24 Bare bulb configuration procedure 25 Embedded configuration replacement procedure . 26 Embedded configuration
21、initial installation procedure 37 Troubleshooting procedures . 37 Troubleshooting procedure for thermo- couple sensor instrumentation systems . 37 Visual examination . 38 Thermocouple sensor check 38 Monitoring system check 40 Extension wire continuity check 41 Thermocouple sensor connection to moni
22、toring system extension wire continuity check 41 configuration . 41 Stuffing tube cable entrance Electrical connector cable entrance Thermocouple sensor connection to junction box extension wire continuity check . 44 Junction box to monitoring system extension wire continuity check . 44 Junction box
23、 continuity check 46 Junction box with stuffing tube cable entrance configuration 46 Junction box with electrical connector cable entrance 46 Troubleshooting procedure for resistance thermometer instrumentation systems . 47 Visual examination . 48 Resistance thermometer check . 48 Monitoring system
24、check 50 configuration . 43 vi Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-278 66 7777770 00LLb05 5 . Paragraph 5.6.2.4 5.6.2.4.1 5.6.2.4.1.1 5.6.2.4.1.2 5.6.2.4.2 5.6.2.4.3 5.6.2.5 5.6.2.5.1 5.6.2.5.2 6. 6.1 6.2 6.3 Figure 1. 2. 3. 4. 5
25、. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. MIL-HDBK-298(SH) 30 September 1988 CONTENTS - Continued Extension wire continuity check Resistance thermometer connection to monitoring system extension wire continuity check Stuffing tube cable entrance configuration Electrical connector cable entrance conf
26、iguration . Resistance thermometer connection to junction box extension wire continuity check . extension wire continuity check . Junction box to monitoring system Page 51 51 51 53 54 54 Junction box continuity check . . . . . . . . . . , , 56 Junction box with stuffing tube cable Junction box with
27、electrical connector entrance configuration cable entrance configuration NOTES . Intended use . Issue of DoDISS . . Subject term (key word) listing FIGURES Thermowell configuration Components for thermowell and bare bulb configurations . Patch cords . Pipe plug protection for thermowell bore Bare bu
28、lb configuration and typical installation . Embedded configuration and typical installation . Installation of extension wires . Installation of terminal board connecting wires and extension wires Stuffing tube components and installation method . Installation of electrical connectors . Thermowell co
29、nfiguration in piping system . Construction of typical bearing , , . Placement of embedded thermocouple sensor/ resistance thermometer in a bearing Connecting wire connections . Typical thermocouple sensor/resistance thermometer installation in a bearing Placement of connecting wires through the bea
30、ring 56 56 57 57 57 58 59 60 61 62 63 64 65 67 68 69 71 72 73 74 75 76 vi i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 17. 18. 19 I 20. 21, 22 I 23 24 I 25. 26 27 28. 29. 50. Table I. II. III IV. V. VI VII. VI11 I IX I - MIL-HDK-278 bb 77
31、f7770 ClOllbOb 7 HIL-HDBK-298(SH) 30 September 1988 FIGURES - Continued viii Page Smooth puddled surface flush with babbitt Filling cavity containing thermocouple surface of bearing . 77 sensor/resistance thermometer connecting wires with potting mixture . 77 Configurations for electrical connectors
32、 78 Reversal of wire 80 Thermocouple sensor check . 81 Thermocouple sensor monitoring system check 82 Order to perform extension wire Extension wire continuity check . 84 Reasons for discontinuity, three-wire configuration 85 Junction box three-wire continuity check 86 Reasons for discontinuity, two
33、-wire configuration 88 Single reversal of wire . 89 Resistance thermometer check 90 Resistance thermometer monitoring system check 91 continuity check . 83 TABLES Standard extension wire cable . 11 Color identification code for thermocouple sensor cable . 12 Equivalent electrical connectors for bare
34、 bulb configuration . 13 List of tools, materiais, and test equipment 18 Patch cords . 19 Lengths to strip ends of individual conductors . 23 Tools for insertion or removal of electrfcai connector contacts 23 Temperature versus mV characteristics for type K (chrome1 versus alwnel) thermocouples 28 i
35、stics for resistance thermometers . 33 Temperature versus resistance character- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-278 66 m 7797770 OOLLbO7 7 m MIL-HDBK-298(SH) 30 September 1988 1. SCOPE 1.1 ScoDe. This handbook covers the sele
36、ction, installation and trouble- shooting of thermocouple sensors and resistance thermometers that are constructed in accordance with MIL-T-24388. 1.2 Classification. The thermocouple sensors and resistance thermometers shall be classified in accordance with the following: Type: Resistance thermomet
37、er with a platinum element (PRT). Resistance thermometer with a nickel element (NRT). Thermocouple type K (KTC). Configuration: Thermowell (TW). Bare bulb (BB) . Embedded (EM). Designation: Sheath length. Temperature range. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 SDecifications. The
38、following specifications form a part of this document to the extent specified herein. 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). Unless otherwise Specified, t
39、he issues SPECIFICATIONS FEDERAL QQ- S - 5 7 1 QQ-T-390 MILITARY MIL- C - 9 15 MS3102 MS3106 MIL-T-24270 .MIL-T- 24388 MS 27 5 34 - Solder, Tin Alloy: Tin-Lead Alloy; and Lead - Tin Alloy Ingots and Castings and Lead Alloy Alloy. Ingots and Castings (Antifriction Metal) for Bearing Applications. s -
40、 Cable and Cord, Electrical, for Shipboard Use, General Specification for. - Connector, Receptacle, Electric, Box Mounting, Solder Contacts, AN Type. - Connector, Plug, Electric, Straight, Solder Contacts, AN Type. - Thermowells for Thermometers and Electrical Temperature Sensors, General Specificat
41、ion for, - Thermocouple and Resistance Temperature Element Assemblies, General Specification for (Naval Shipboard). Connector. - Tool, Contact Insertion-Extraction, Electrical 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-298(SH) 30 Sept
42、ember 1988 MILITARY (Continued) MIL-I-81969/14 - Installing and Removal Tools, Connector Elec- trical Contact, Type III, Class 2, Composition B. trical Contact, Type II, Class 2, Composition A. trical Contact, Type I, Class 1, Composition C. trical Contact, Type II, Class 1, Composition C. trical Co
43、ntact, Type II, Class 1, Composition B. MIL-I-81969/15 - Installing and Removal Tools, Connector Elec- MIL-I-81969/17 - Installing and Removal Tools, Connector Elec- MIL-I-81969/19 - Installing and Removal Tools, Connector Elec- MIL-I-81969/29 - Installing and Removal Tools, Connector Elec- (Unless
44、otherwise indicated, copies of federal and military specifications are available from the Naval Publications and Forms Center, (ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2,1.2 Other Government Dubiication. The following other Government publication forms a part of this document
45、to the extent specified herein. otherwise specified, the issue is that cited in the solicitation. Unless PUBLICATION NAVAL SEA SYSTEMS COMMAND (NAVSEA) 0942-LP-016-1010 - Gear Reduction Maintenance. (Application for copies should be addressed to the Naval Publications and Forms Center, (ATTN: NPODS)
46、, 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.2 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 applicable laws and regulations unless a
47、 specific exemption has been obtained. 3. DEFINITIONS 3.1 Alumel. Alumel is a metal that is sometimes used as one of the two wires which make up a thermocouple. a type K thermocouple, Alumel metal is magnetic. As a part of a type K thermocouple, the alumel wire is considered to be the one with a neg
48、ative electrical potential. insulation is color coded red. When joined to a chrome1 wire, the result is When the wire insulation is color coded, the alumel wire 3.2 Assembly. thermocouDie sensor or resistance thermometer, The thermo- couple sensor or resistance thermometer assembly consists of a the
49、rmocouple sensor or resistance thermometer, connection head and connection head extension. The thermocouple sensor or resistance thermometer assembly is applicable to the thermowell configuration (see figure 1). 3.3 Boss. thermowell. A thermowell boss is an insert or fitting attached to the piping that attaches the thermowell to the piping. 2 Provided by IHSNot for ResaleNo reproduction or netwo
