ASTM E1684-00
(Specification)Standard Specification for Miniature Thermocouple Connectors
Standard Specification for Miniature Thermocouple Connectors
SCOPE
1.1 This specification covers separable single-circuit miniature thermocouple connectors with two flat pins. Connectors covered by this specification must be rated for continuous use to at least 300°F (150°C), but they may optionally be rated higher.
1.2 This specification does not cover multiple-circuit connectors, multi-pin connectors, standard size connectors, or connectors intended primarily for panel mounting. High-temperature connectors (for example, those designed for continuous use at temperatures significantly above approximately 500°F (260°C)) are not intended to be covered by this specification.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 The following precautionary statement pertains only to the test methods portion, Section 9, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E 1684 – 00
Standard Specification for
Miniature Thermocouple Connectors
This standard is issued under the fixed designation E1684; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Definitions of Terms Specific to This Standard:
3.2.1 connector pair, n—an assembly consisting of a plug
1.1 This specification covers separable single-circuit minia-
and a jack, each having both positive and negative inserts, that
ture thermocouple connectors with two flat pins. Connectors
will connect two parts of an electrical circuit and provide a
covered by this specification must be rated for continuous use
means of physically disconnecting the two parts without the
to at least 300 °F (150 °C), but they may optionally be rated
use of tools.
higher.
3.2.2 contact insert, n—metallic conductor assemblies that,
1.2 This specification does not cover multiple-circuit con-
when installed in connector bodies, provide connections be-
nectors, multi-pin connectors, standard size connectors, or
tween two parts of an electrical circuit. Plug connectors will
connectors intended primarily for panel mounting. High-
contain projecting prong contacts, while jack connectors will
temperature connectors (for example, those designed for con-
contain recessed socket or receptacle contacts.
tinuous use at temperatures significantly above approximately
3.2.3 service life, n—the interval of time that a connector
500 °F (260 °C)) are not intended to be covered by this
assembly will be put to use and retain all physical and
specification.
thermoelectric properties.
1.3 The values stated in inch-pound units are to be regarded
3.2.4 test difference, n—the apparent thermoelectric differ-
as the standard. The values given in parentheses are for
ence attributable to mated connectors observed by the test
information only.
procedure of this specification.
1.4 The following precautionary statement pertains only to
the test methods portion, Section 9, of this specification: This
4. Significance and Use
standard does not purport to address all of the safety concerns,
4.1 The widespread use of thermocouple connectors re-
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
quires standardization of mating dimensions and performance
of this standard to establish appropriate safety and health
characteristics.
practices and determine the applicability of regulatory limita-
4.2 This specification describes miniaturized thermocouple
tions prior to use.
connector dimensions and capabilities and includes test proce-
2. Referenced Documents dures suitable for evaluating the performance of a particular
specimen or design. The tests described are not intended for
2.1 The following documents of the latest issue form a part
routineinspectionorrapidtestingoflargegroupsofconnectors
of this specification to the extent referenced herein. In case of
or for quality control purposes.
conflict between this specification and another referenced
document, this specification shall take precedence.
5. Classification
2.2 ASTM Standards:
5.1 Plugs or Jacks:
E230 Specification and Temperature-Electromotive Force
2 5.1.1 Connectors shall be constructed as either plugs or
(EMF) Tables for Standardized Thermocouples
jacks, and these two forms shall be designed to connect with
E344 Terminology Relating to Thermometry and Hydrom-
2 each other.
etry
5.1.2 Plug connectors shall have two external prong con-
3. Terminology tacts of differing sizes to prevent improper mating. The
negative prong shall be the wider, as indicated in Table 1.
3.1 Definitions—The definitions given in Terminology
5.1.3 Jack connector shall have two internal socket contacts
E344 shall apply.
sized and spaced to receive and accommodate the prong
contacts of the mating plug. Jack connectors shall also include
This specification is under the jurisdiction of ASTM Committee E-20 on
a means of producing and maintaining sufficient contact
Temperature Measurement and is the direct responsibility of Subcommittee E20.04
pressuretomeetalltheotherrequirementsofthisspecification.
on Thermocouples.
5.2 ANSI/ASTM Type:
Current edition approved Jan. 10, 2000. Published February 2000. Originally
published as E1684–95. Last previous edition E1684–96.
Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 1684
TABLE 1 Dimensions TABLE 3 Ratings
Minimum Size, Maximum Size, Characteristic min max
A
Dimension Symbol
in. (mm) in. (mm)
Operating temperature 0 °F (−18 °C) 300 °F (150 °C)
Plug body length PL . 0.788 (20.00) Contact resistance (each leg) . 0.04 V
Jack body length JL . 1.069 (27.13) Insulation resistance at room temperature 10 V .
Body width W . 0.635 (16.10)
Insulation resistance at 300 °F (150 °C) 10 V .
Body thickness T . 0.385 (9.78) Test difference . 62°F(61.1 °C)
Length of prong P 0.406 (10.31) 0.515 (13.10) Repeated coupling cycles (coupled or 25 .
Depth of socket J 0.515 (13.10) . uncoupled)
Prong spacing X 0.307 (7.80) 0.317 (8.05) Service life 5000 h .
Positive pin width W1 0.090 (2.28) 0.098 (2.49) Withdraw force 8 oz .
Negative pin width W2 0.121 (3.07) 0.129 (3.27)
Pin thickness T1 0.030 (0.73) 0.034 (0.86)
A
Symbol reference corresponds to Fig. 1.
7.1.3 The connector bodies shall be colored in accordance
with the color code given in Table 2 to provide rapid and
permanent identification of the thermocouple calibration with
which it is designed to be used. Each plug and jack shall be
5.2.1 Connectors shall be produced in versions to match
each of the standardized ANSI/ASTM thermocouple types as permanently marked with a symbol or symbols to identify
given in Table 2. positive and negative conductor inserts. All connectors shall
5.2.2 The insert materials of each plug and jack shall have bear the supplier’s name or other means of source identifica-
thermoelectric properties conforming to the characteristics of tion, unless otherwise specified in the purchasing documents.
the corresponding thermocouple type as given in Specification 7.1.4 An insulating barrier shall be incorporated into each
E230 over the temperature range specified in Table 3. connector body to prevent inadvertent contact between ther-
5.2.3 Calibration conformance and gradient testing is not moelements or wires.
applicable to Type B thermoelectrically neutral (Cu/Cu) con- 7.2 Inserts:
nectors. 7.2.1 Contact inserts shall be fabricated of paired materials
ofthesamethermocoupletypeasthethermocouplewithwhich
6. Ordering Information they are to be used.
7.2.2 The inside width and depth of the jack connector shall
6.1 Orders for connectors under this specification shall
be such as to receive the corresponding plug prong smoothly
include the following:
and easily when inserted.
6.1.1 Quantity of plugs or jacks (specify which);
7.2.3 The force required for complete disengagement shall
6.1.2 ANSI/ASTM calibration thermocouple type (see
conform to the requirements of Table 3.
Table 2);
7.3 Construction and Assembly:
6.1.3 Anyoptionalaccessoriesthatmayberequired,suchas
7.3.1 Wire attachment shall be by means of a screw or
those listed in 7.4.3;
clampsuitableforusewithwirediametersfrom30AWG(0.01
6.1.4 Special testing requirements; and
in. or 0.25 mm in diameter) to 20 AWG (0.032 in. or 0.8 mm
6.1.5 Requirements for certificates of conformance to the
in diameter).
specifications or reports of the results of any required testing.
7.3.2 Contact inserts and wire attaching parts shall be held
captive to one of the body parts.
7. Materials and Manufacture
7.3.3 Connections and final closures of the connector shall
7.1 Body:
be accomplished with simple hand tools such as
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