1、Designation: E 1684 05Standard Specification forMiniature Thermocouple Connectors1This standard is issued under the fixed designation E 1684; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in pa
2、rentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers separable single-circuit minia-ture thermocouple connectors with two flat pins. Connectorscovered by this specification
3、must be rated for continuous useto at least 300 F (150 C), but they may optionally be ratedhigher.1.2 This specification does not cover multiple-circuit con-nectors, multi-pin connectors, standard size connectors, orconnectors intended primarily for panel mounting. High-temperature connectors (for e
4、xample, those designed for con-tinuous use at temperatures significantly above approximately500 F (260 C) are not intended to be covered by thisspecification.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.4 The f
5、ollowing precautionary statement pertains only tothe test methods portion, Section 9, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and h
6、ealthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 The following documents of the latest issue form a partof this specification to the extent referenced herein. In case ofconflict between this specification and another referenceddocument
7、, this specification shall take precedence.2.2 ASTM Standards:2E 230 Specification and Temperature-Electromotive Force(EMF) Tables for Standardized ThermocouplesE 344 Terminology Relating to Thermometry and Hydrom-etry3. Terminology3.1 DefinitionsThe definitions given in TerminologyE 344 shall apply
8、.3.2 Definitions of Terms Specific to This Standard:3.2.1 connector pair, nassembly consisting of a plug anda jack, each having both positive and negative inserts, that willconnect two parts of an electrical circuit and provide a meansof physically disconnecting the two parts without the use oftools
9、.3.2.2 contact insert, nmetallic conductor assemblies that,when installed in connector bodies, provide connections be-tween two parts of an electrical circuit. Plug connectors willcontain projecting prong contacts, while jack connectors willcontain recessed socket or receptacle contacts.3.2.3 servic
10、e life, ninterval of time that a connectorassembly will be put to use and retain all physical andthermoelectric properties.3.2.4 test difference, napparent thermoelectric differenceattributable to mated connectors observed by the test procedureof this specification.4. Significance and Use4.1 The wid
11、espread use of thermocouple connectors re-quires standardization of mating dimensions and performancecharacteristics.4.2 This specification describes miniaturized thermocoupleconnector dimensions and capabilities and includes test proce-dures suitable for evaluating the performance of a particularsp
12、ecimen or design. The tests described are not intended forroutine inspection or rapid testing of large groups of connectorsor for quality control purposes.5. Classification5.1 Plugs or Jacks:5.1.1 Connectors shall be constructed as either plugs orjacks, and these two forms shall be designed to conne
13、ct witheach other.5.1.2 Plug connectors shall have two external prong con-tacts of differing sizes to prevent improper mating. Thenegative prong shall be the wider, as indicated in Table 1.5.1.3 Jack connector shall have two internal socket contactssized and spaced to receive and accommodate the pro
14、ngcontacts of the mating plug. Jack connectors shall also include1This specification is under the jurisdiction of ASTM Committee E20 onTemperature Measurement and is the direct responsibility of Subcommittee E20.04on Thermocouples.Current edition approved May 1, 2005. Published May 2005. Originallya
15、pproved in 1995. Last previous edition approved in 2000 as E 1684 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM
16、website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.a means of producing and maintaining sufficient contactpressure to meet all the other requirements of this specification.5.2 ANSI/ASTM Type:5.2.1 Connectors shall be produced in
17、 versions to matcheach of the standardized ANSI/ASTM thermocouple types asgiven in Table 2.5.2.2 The insert materials of each plug and jack shall havethermoelectric properties conforming to the characteristics ofthe corresponding thermocouple type as given in SpecificationE 230 over the temperature
18、range specified in Table 3.5.2.3 Calibration conformance and gradient testing is notapplicable to Type B thermoelectrically neutral (Cu/Cu) con-nectors.6. Ordering Information6.1 Orders for connectors under this specification shallinclude the following:6.1.1 Quantity of plugs or jacks (specify which
19、);6.1.2 ANSI/ASTM calibration thermocouple type (seeTable 2);6.1.3 Any optional accessories that may be required, such asthose listed in 7.4.3;6.1.4 Special testing requirements; and6.1.5 Requirements for certificates of conformance to thespecifications or reports of the results of any required test
20、ing.7. Materials and Manufacture7.1 Body:7.1.1 The dimensions of the connector bodies shall fallwithin the limits given in Table 1.7.1.2 The connector body shall be made of an insulatingmaterial capable of continuous use at any temperature between0 F (18 C) and 300 F (150 C) for the service life giv
21、en inTable 3, without losing its ability to conform to this specifica-tion.7.1.3 The connector bodies shall be colored in accordancewith the color code given in Table 2 to provide rapid andpermanent identification of the thermocouple calibration withwhich it is designed to be used. Each plug and jac
22、k shall bepermanently marked with a symbol or symbols to identifypositive and negative conductor inserts. All connectors shallbear the suppliers name or other means of source identifica-tion, unless otherwise specified in the purchasing documents.7.1.4 An insulating barrier shall be incorporated int
23、o eachconnector body to prevent inadvertent contact between ther-moelements or wires.7.2 Inserts:7.2.1 Contact inserts shall be fabricated of paired materialsof the same thermocouple type as the thermocouple with whichthey are to be used.7.2.2 The inside width and depth of the jack connector shallbe
24、 such as to receive the corresponding plug prong smoothlyand easily when inserted.7.2.3 The force required for complete disengagement shallconform to the requirements of Table 3.7.3 Construction and Assembly:7.3.1 Wire attachment shall be by means of a screw orclamp suitable for use with wire diamet
25、ers from 30AWG (0.01in. or 0.25 mm in diameter) to 20 AWG (0.032 in. or 0.8 mmin diameter).7.3.2 Contact inserts and wire attaching parts shall be heldcaptive to one of the body parts.7.3.3 Connections and final closures of the connector shallbe accomplished with simple hand tools such as screwdrive
26、rs,wrenches, or pliers.7.4 Optional Accessories:7.4.1 Connector accessories are not covered by this speci-fication and may be unique to a manufacturers specific design.7.4.2 All required optional accessories are to be specifiedseparately from the connectors.7.4.3 The following is a partial list of u
27、seful accessoryitems:7.4.3.1 Cable clamping devices for attaching flexible cables;7.4.3.2 Clamps for rigid tubing and sheaths in a range ofdiameters whose conductor sizes are within the range specifiedin 7.3.1;7.4.3.3 Elastomeric boots to seal connector assembliesagainst moisture in service;TABLE 1
28、DimensionsDimension SymbolAMinimum Size,in. (mm)Maximum Size,in. (mm)Plug body length PL . 0.788 (20.00)Jack body length JL . 1.069 (27.13)Body width W . 0.635 (16.10)Body thickness T . 0.385 (9.78)Length of prong P 0.406 (10.31) 0.515 (13.10)Depth of socket J 0.515 (13.10) .Prong spacing X 0.307 (7
29、.80) 0.317 (8.05)Positive pin width W1 0.090 (2.28) 0.098 (2.49)Negative pin width W2 0.121 (3.07) 0.129 (3.27)Pin thickness T1 0.030 (0.73) 0.034 (0.86)ASymbol reference corresponds to Fig. 1.TABLE 2 IdentificationANSI/ASTMTypeABody Color CodingT blueJ blackE purpleK yellowN orangeR or S greenB (Cu
30、/Cu)AwhiteCredAThermoelectrically neutral (Cu/Cu) connectors are customarily used with TypeB thermocouples.TABLE 3 RatingsCharacteristic min maxOperating temperature 0 F (18 C) 300 F (150 C)Contact resistance (each leg) . 0.04 VInsulation resistance at room temperature 107V .Insulation resistance at
31、 300 F (150 C) 106V .Test difference . 62F(61.1 C)Repeated coupling cycles (coupled oruncoupled)25 .Service life 5000 h .Withdraw force 8 oz .E16840527.4.3.4 Safety clamps or other devices to prevent inadvert-ent separation of connectors under conditions of severe vibra-tion; and7.4.3.5 Flat washers
32、 for use under wire attachment screwheads as an aid in the retention of the wires.7.4.4 Some suppliers may not offer all the above items,while others may offer additional items. Supplier catalogs andliterature should be consulted for details.8. Physical Properties8.1 The physical size of connectors
33、conforming to thisspecification shall fall within the limits given in Table 1 for alldimensions indicated in that table.All other dimensions and alldetails of construction shall be determined by a manufacturersspecific design.9. Test Methods9.1 Contact Resistance Test:9.1.1 A direct current of 1.0 A
34、 from a constant currentsource shall be passed through one half (for example, thepositive leg) of a mated connector pair. The voltage drop acrossthat leg of the mated pair shall be measured and recorded. Theprocedure shall be repeated on the same leg of the matedconnector pair but with reversed pola
35、rity. The average of thetwo measured voltage drops shall be calculated to eliminatethermoelectrical effects. The contact resistance in ohms is thencomputed by dividing the average drop in volts by the currentin amperes.9.1.2 The entire procedure of 9.1.1 is then repeated for theother half (negative
36、leg) of the mated connector pair.9.1.3 The contact resistance value for each leg must bewithin the limit given in Table 3.9.1.4 Alternate test methods may be used if agreeable toboth the supplier and the purchaser. In such event, the testmethod to be used shall be identified.9.2 Thermal Gradient Tes
37、t:9.2.1 Apparatus:9.2.1.1 Heated ChamberObtain or construct a chambermade of suitable heat-resisting materials. Use Fig. 2 as ageneral guide for construction. A controlled heat source otherthan light bulbs may be used.9.2.1.2 Test Panel, fabricated and fitted similar to thatshown in Fig. 2. The smal
38、l, removable central panel throughwhich the plug and jack are mated should be made ofelectrically insulating, heat-resistant material not more than132-in. (0.8-mm) thick. This central panel should be somewhatlarger than the outside dimensions of the connectors to betested. The panel is pierced with
39、two clearance holes throughwhich the connector prongs pass during the test.Athird hole isprovided alongside the connector location through which asingle length of duplex thermocouple wire can pass.9.2.2 Test Specimen Preparation:9.2.2.1 For uniformity of test results, use 24 AWG (0.020-in. or 0.5-mm
40、 diameter) thermocouple wire or extension wireof the type corresponding to the connector to be tested. Largerdiameter wire will produce higher values of measured testdifference, while smaller diameter wire will produce lowervalues.9.2.2.2 Cut (in half) a continuous length of appropriateduplex thermo
41、couple wire. Strip all cut ends. Form a singlejunction by welding four conductors at one end into a commonbead. Cut one of the two wire lengths at a distance of 4 to 6 in.(10 to 15 cm) from the junction bead. Strip these newly cutends, and connect the jack connector being tested to the shortwire len
42、gth extending from the weld bead. Then connect theseparate segment of wire to the plug connector being tested, asshown in Fig. 3.9.2.2.3 Assemble the connectors in the removable test panelby pushing the plug prongs through two holes in the test paneland mating the jack to it as shown in Fig. 2. Pass
43、 the uncutlength of wire from the junction bead through the third hole inthe test panel.9.2.3 Test Procedure:9.2.3.1 Install the test panel containing the previously wiredconnectors in an opening in the test chamber so that thejunction bead and jack connector are inside the heated chamberFIG. 1 Mini
44、ature Thermocouple Connector Dimensions(see Table 1)FIG. 2 General Arrangement for Thermal Gradient TestE1684053as shown in Fig. 2. Stabilize the test chamber at 150 6 10 F(65 6 5 C) and allow the system to come to thermalequilibrium.9.2.3.2 Connect an instrument, capable of resolving 0.2 F(0.1 C) o
45、r less, to the wire pair passing through the hole in thetest panel, and measure and record the chamber temperature.Reconnect the instrument to the wire pair extending from theconnector plug under test. Measure and record the new reading.The difference between the first reading, taken directly, and t
46、hesecond, taken through the connector pair under test, is the testdifference.9.2.3.3 The test difference expresses quantitatively the ef-fect of the connector pairs presence in the circuit under the testconditions. The test difference shall not be greater than thevalue given in Table 3 for qualifica
47、tion under this specification.9.3 Insulation Resistance Test:9.3.1 Insulation resistance between legs shall be measuredwith a megohm meter using a voltage between 25 and 100 Vdc. The measured resistance shall not be less than the valuegiven in Table 3 when tested at any temperature within therated r
48、ange.9.3.2 The insulation resistance between each leg and anyother exposed metallic part or electrically conducting portionof a thermocouple connector assembly, including fasteners,shall not be less than the value given in Table 3 when tested ina manner similar to 9.3.1.10. Rejection10.1 Material th
49、at fails to conform to the requirements ofthis specification may be rejected.11. Keywords11.1 connector; contact inserts; jacks; miniature connector;plug; thermocouple; thermocouple connectorASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to re
