ASTM E1129 E1129M-1998(2002) Standard Specification for Thermocouple Connectors.pdf

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1、Designation: E 1129/E 1129M 98 (Reapproved 2002)Standard Specification forThermocouple Connectors1This standard is issued under the fixed designation E 1129/E 1129M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last

2、revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers separable single-circuit ther-mocouple connectors with two round pins. Connectors coveredby this

3、 specification must be rated for continuous use to at least300 F (150 C), but they may optionally be rated higher.1.2 This specification does not cover multiple-circuit con-nectors, multi-pin connectors, miniature connectors, or connec-tors intended primarily for panel mounting. High temperatureconn

4、ectors (for example, those designed for continuous use attemperatures above approximately 500 F (260 C) are notintended to be covered by this specification.1.3 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.1.4 The following precautionary statement

5、pertains only tothe test method 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 healthpractices and determine the a

6、pplicability 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, this specification shall take pr

7、ecedence.2.2 ASTM Standards:E 230 Specification and Temperature-Electromotive Force(EMF) Tables for Standardized Thermocouples2E 344 Terminology Relating to Thermometry and Hydrom-etry2E 608 Specification for Mineral-Insulated, Metal-SheathedBase-Metal Thermocouples23. Terminology3.1 Definitions: Th

8、e definitions given in Terminology E 344shall apply.3.2 Definitions of Terms Specific to This Standard:3.2.1 connector pair, nan assembly consisting of a plugand a jack, each having both positive and negative inserts, thatwill connect two parts of an electrical circuit and provide ameans of physical

9、ly disconnecting the two parts without theuse of tools.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 willconta

10、in recessed socket or receptacle contacts.3.2.3 service 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

11、 this specification.4. Significance and Use4.1 The widespread use of thermocouple connectors re-quires standardization of mating dimensions and performancecharacteristics.4.2 This specification describes standardized thermocoupleconnector dimensions and capabilities and includes test proce-dures sui

12、table for evaluating the performance of a particularspecimen 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 o

13、rjacks, and these two forms shall be designed to connect witheach other.5.1.2 Plug connectors shall have two external prong con-tacts of differing diameters to prevent improper mating. Thenegative prong shall be the larger, as shown in Table 1 and Fig.1.5.1.3 Jack connectors shall have two internal

14、socket con-tacts sized and spaced to receive and accommodate the prongcontacts of the mating plug. Jack connectors shall also includea means of producing and maintaining sufficient contactpressure to meet all of the other requirements of this specifi-cation.1This specification is under the jurisdict

15、ion of ASTM Committee E20 onTemperature Measurement and is the direct responsibility of Subcommittee E20.04on Thermocouples.Current edition approved Oct. 10, 2002. Published May 2003. Originallyapproved in 1986. Last previous edition approved in 1998 as E 1129 98.2Annual Book of ASTM Standards, Vol

16、14.03.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 ANSI/ASTM Type:5.2.1 Connectors shall be produced in versions to matcheach of the standardized ANSI/ASTM thermocouple types asgiven in Table 2.5.2.2 The insert materials of ea

17、ch plug and jack shall havethermoelectric properties conforming to the characteristics ofthe corresponding thermocouple type as given in SpecificationE 230 over the temperature range specified in Table 3.5.2.3 Calibration conformance and gradient testing is notapplicable to Type B thermoelectrically

18、 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),6.1.2 ANSI/ASTM thermocouple type (see Table 2),6.1.3 Any optional accessories that may be required, such asthose listed

19、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 testing.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

20、.2 The connector body shall be made of an electricallyinsulating material capable of continuous use at any tempera-ture between 0 F (-18 C) and 300 F (150 C) for the servicelife given in Table 3, without losing its ability to conform tothis specification.7.1.3 The connector bodies shall be colored i

21、n 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 jack shall bepermanently marked with a symbol or symbols to identifypositive and negative conductor inserts. All connectors

22、 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 into eachconnector body to prevent inadvertent contact between ther-moelements or wires.7.2 Inserts:7.2.1 Contact inserts m

23、ay be either solid or hollow as longas all of the requirements of this specification are met.TABLE 1 DimensionsDimension SymbolAMinimum,in. (mm)Maximum,in. (mm)Body length L . 1.505 (38.23)Body width W . 1.088 (27.64)Body thickness T . 0.515 (13.08)Length of prong P 0.535(13.59)0.650 (16.51)Depth of

24、 socket J 0.650(16.51).Prong spacing X 0.432(10.97)0.442 (11.23)Positive pin D1 0.152 (3.86) 0.158 (4.02)diameterNegative pin D2 0.182 (4.62) 0.190 (4.83)diameterLocation of detent E 0.180 (4.57) 0.200 (5.08)Width of detent G 0.040 (1.02) .Depth of detent F 0.010 (0.25) 0.025 (0.64)ASymbols are acco

25、rding to Fig. 1.NOTEA solid prong is shown for clarity of design.FIG. 1 Thermocouple Connector Dimensions, (see Table 1)TABLE 2 IdentificationANSI/ASTMTypeBody ColorCodingT BlueJ BlackE PurpleK YellowN OrangeR or S GreenB (Cu/Cu)AWhiteAUncompensated (Cu/CU) connectors are customarily used with Type

26、Bthermocouples.TABLE 3 RatingsCharacteristic min maxOperating temperature 0 F(18 C)300 F(150 C)Insertion force 6 lb(27 N)18 lb(80 N)Withdrawal force 6 lb(27 N)18 lb(80 N)Contact resistance (each leg) . 0.04 ohmsInsulation resistance 107ohms .Test difference . 62F(61.1 C)Repeated cycles (coupled orun

27、coupled)25 .Service life 5000 h .E 1129/E 1129M 98 (2002)27.2.2 Contact inserts shall be fabricated of materials thatmeet the requirements of Section 5.7.2.3 The inside diameter and depth of the jack connectorshall be such as to receive the corresponding plug prongsmoothly and easily when inserted.

28、A spring loaded detentdevice shall be incorporated in the negative side of the jackconnector to engage the detent in the negative plug prong. Thefunction of the detent system shall be to cause positive lockingtogether of a plug and jack when fully mated. The detentsystem shall not permit the two con

29、nectors to be separated bymore than 0.03 in. (0.8 mm) when subjected to a withdrawalforce less than the minimum given in Table 3.7.2.4 The forces required for complete engagement ordisengagement shall be within the limits listed in Table 3.7.2.5 The connector pair shall be capable of repeatedinserti

30、on and withdrawal cycles as given in Table 3 withoutlosing the ability to conform to the requirements of thisspecification.7.2.6 The dimensions and locations of the inserts in theconnector bodies shall fall within the limits given in Table 1.7.3 Construction and Assembly:7.3.1 Wire attachment shall

31、be by means of a screw orclamp suitable for use with wire diameters from 30 AWG (0.01in. or 0.25 mm in diameter) to 18 AWG (0.04 in. or 1.0 mm indiameter).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 connecto

32、r shallbe accomplished with simple hand tools such as screwdrivers,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 specifiedseparatel

33、y from the connectors.7.4.3 The following is a partial list of useful accessoryitems:7.4.3.1 Cable clamping devices, for attaching flexiblecables;7.4.3.2 Clamps for rigid tubing and sheaths in a range ofdiameters as listed in Specification E 608;7.4.3.3 Elastomeric boots to seal connector assemblies

34、against moisture in service;7.4.3.4 Safety clamps or other devices to prevent inadvert-ent separation of connectors under conditions of severe vibra-tion; and7.4.3.5 Flat washers for use under wire attachment screwheads as an aid in the retention of the wires.7.4.4 Some suppliers may not offer all o

35、f the above itemswhile others may offer additional items. Supplier catalogs andliterature should be consulted for details.8. Physical Properties8.1 The physical size of connectors conforming to thisspecification shall fall within the limits given in Table 1 for alldimensions indicated in that table.

36、 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 from a constant currentsource shall be passed through one half (for example, thepositive leg) of a mated connector pai

37、r. 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 polarity. The average of thetwo measured voltage drops shall be calculated to eliminatethermoelectrical effects. The contac

38、t 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 leg) of the mated connector pair.9.1.3 The contact resistance value for each leg must bewithin the limit given in Table

39、 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 Test:9.2.1 Apparatus:9.2.1.1 Heated Chamber, obtain or construct a chambermade of suitable heat resisting materials. Use F

40、ig. 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 small, removable, central panel throughwhich the plug and jack are mated should be made ofelectrically insulating, heat-r

41、esistant material not more thanabout 0.032 in. (0.8 mm) thick. This central panel should besomewhat larger than the outside dimensions of the connectorsto be tested. The panel is pierced with two clearance holesthrough which the connector prongs pass during the test. Athird hole is provided alongsid

42、e the connector location throughwhich a single 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 diameter) thermocouple wire or extension wire ofthe type corresponding to the connector to be tested. Larg

43、erdiameter 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 thermocouple wire. Strip all cut ends. Form a singlejunction by welding four conductors at one end into a commonb

44、ead. 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 length extending from the weld bead. Then connect theseparated segment of wire to the plug connector being test

45、ed,as shown 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 the uncutlength of wire from the junction bead through the third hole inthe test panel.9.2.3 Test Procedur

46、e:E 1129/E 1129M 98 (2002)39.2.3.1 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 chamberas shown in Fig. 2. Stabilize the test chamber at 150 6 10 F(65 6 5 C) and allow the system t

47、o reach thermal equilibrium.9.2.3.2 Connect an instrument capable of resolving 0.2 F(0.1 C) or less, to the wire pair passing through the hole in thetest panel. Measure and record the chamber temperature.Reconnect the instrument to the wire pair extending from theconnector plug under test. Measure a

48、nd record the new reading.The difference between the first reading, taken directly, and thesecond, 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 testconditio

49、ns. The test difference shall not be greater than thevalue given in Table 3 for qualification under this specification.NOTE 1The test difference plus the thermocouple wire error must becombined to determine total error in a thermocouple circuit under thesetest conditions.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 value givenin Table 3 when tested at any temperature within the ratedrange.9.3.2 The ins