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ASTM E 230 Document Information:
Title
Standard Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples
ASTM International
Publication Date:
Sep 23, 2003
Scope:
This specification contains reference tables (Tables 8 - 25) that give
temperature-electromotive
force (emf) relationships for Types B, E, J, K, N, R, S, T, and C
thermocouples. These are the
thermocouple types most commonly used in industry.
Also included are lists of standard and special tolerances on initial
values of emf versus
temperature for thermocouples (Table 1), thermocouple extension wires
(Table 2), and compensating
extension wires for thermocouples (Table 3).
Tables 4 - 5, included herein, give data on insulation color coding
for thermocouple and
thermocouple extension wires as customarily used in the United States.
Recommendations regarding upper temperature limits for the
thermocouple types referred to in 1.1
are given in Table 6.
Tables 26 - 45 give temperature-emf data for single-leg thermoelements
referenced to platinum (NIST
Pt 67). The tables include values for Types BP, BN, JP, JN, KP (same
as EP), KN, NP, NN, TP, and TN
(same as EN).
Tables for Types RP, RN, SP, and SN thermoelements are not included
since, nominally, Tables 18 -
21 represent the thermoelectric properties of Type RP and SP
thermoelements referenced to pure
platinum. Tables for the individual thermoelements of Type C are not
included because materials for
Type C thermocouples are normally supplied as matched pairs only.
Polynomial coefficients that may be used for computation of
thermocouple emf as a function of
temperature are given in Table 7. Coefficients for the emf of each
thermocouple pair as well as for
the emf of most individual thermoelements versus platinum are
included. Coefficients for type RP
and SP thermoelements are not included since they are nominally the
same as for the types R and S
thermocouples, and coefficients for type RN or SN relative to the
nominally similar Pt-67 would be
insignificant. Coefficients for the individual thermoelements of type
C are not established.
Coefficients for sets of inverse polynomials are given in Table 44.
These may be used for computing
a close approximation of temperature (°C) as a function of
thermocouple emf. Inverse functions
are provided only for thermocouple pairs and are valid only over the
emf ranges specified.
This specification is intended to define the thermoelectric properties
of materials that conform to
the relationships presented in the tables of this standard and bear
the letter designations
contained herein. Topics such as ordering information, physical and
mechanical properties,
workmanship, testing, and marking are not addressed in this
specification. The user is referred to
specific standards such as Specifications E 235, E 574, E 585, E 608,
E 1159, or E 1223, as
appropriate, for guidance in these areas.
The temperature-emf data in this specification are intended for
industrial and laboratory use.
Keywords:
- emf computation
- compensating extension wire
- inverse polynomial
- polynomial coefficient
- reference tables
- thermocouple
- thermocouple extension wire
- thermoelement
- upper temperature limit
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