ASTM E574-06

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Designation:E574 −06
StandardSpecification for
Duplex, Base Metal Thermocouple Wire With Glass Fiber or
1
Silica Fiber Insulation
This standard is issued under the fixed designation E574; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.1 amorphous silica fiber, n—continuous filament of heat
insulating material whose principal constituent is amorphous
1.1 Thisspecificationsetsforththerequirementsforduplex,
silica.
types E, J, K, N and T thermocouple wire, insulated with
3.2.2 duplex wire, n—matched pair of parallel, solid
E-glass,S-glass,amorphoussilicafiberorpolycrystallinefiber.
thermoelements, individually insulated (double wrap or braid)
1.2 The values stated in SI units are to be regarded as
with insulating fibers and a fiber braid of the same material
standard. The values given in parentheses are for information
overall.
only.
3.2.3 E-glass, n—family of calcia-alumina-silicate glasses
1.3 This standard does not purport to address all of the
that are used for general purposes and most electrical applica-
safety problems, if any, associated with its use. It is the
tions.
responsibility of the user of this standard to establish appro-
3.2.4 impregnate, v—tosaturatethefiberinsulationofwires
priate safety and health practices and determine the applica-
withahigh-temperatureelectricalinsulatingcompoundtoform
bility of regulatory limitations prior to use.
amoisturebarrieraroundthewiresandtoinhibitfrayingofthe
fibers.
2. Referenced Documents
2
3.2.5 polycrystalline fiber, n—continuous polycrystalline
2.1 ASTM Standards:
filament of heat insulating material whose composition is
D1125Test Methods for Electrical Conductivity and Resis-
alumina, boria, and silica in an approximate ratio of 3:1:2,
tivity of Water
respectively.
E207TestMethodforThermalEMFTestofSingleThermo-
element Materials by Comparison with a Reference Ther-
3.2.6 S-glass, n—family of magnesia-alumina-silicate
moelement of Similar EMF-Temperature Properties
glasses with a higher tensile strength and higher softening
E220Test Method for Calibration of Thermocouples By temperature than E-glass.
Comparison Techniques
E230Specification and Temperature-Electromotive Force 4. Significance and Use
(EMF) Tables for Standardized Thermocouples
4.1 This specification presents the requirements for impreg-
E344Terminology Relating to Thermometry and Hydrom-
nated and non-impregnated fiber insulated thermocouple wire
etry
for normally accepted industrial use, but does not attempt to
define such usage.
3. Terminology
4.2 A supplement contains the requirements for insulated
3.1 Definitions—ThedefinitionsgiveninTerminologyE344
thermocouple wire that will be exposed to high humidity. The
shall apply to this standard.
purchase order or inquiry shall specify if this supplement is
3.2 Definitions of Terms Specific to This Standard:
required.
5. Classification
1
This specification is under the jurisdiction of ASTM Committee E20 on
5.1 Class A–Duplex—E-glass fiber insulated, impregnated
Temperature Measurement and is the direct responsibility of Subcommittee E20.04
with a high-temperature electrical insulating compound and
on Thermocouples.
Current edition approved May 1, 2006. Published May 2006. Originally color coded in accordance with Specification E230.
approved in 1976. Last previous edition approved in 2000 as E574–00. DOI:
5.2 Class B–Duplex—E-glass fiber insulated (Note 1) not
10.1520/E0574-06.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or impregnated and not color coded.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 Class C–Duplex—Amorphous silica fiber insulated
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. (Note 2) not impregnated and not color coded.
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E574−06
5.4 Class D–Duplex—Polycrystalline fiber insulated (Notes 7.1.3.2 Thermoelement Initial Calibration Tolerances
2 and 3) not impregnated and not color coded. —Standard and special tolerances on initial values of emf
versus temperature are given in Table 1 of Specification E230.
5.5 Class E–Duplex—S-glass fiber insulated, impregnated
The purchase order shall specify whether standard or special
with a high-temperature electrical insulating compound and
tolerances are required.
color coded in accordance with Specification E230.
7.2 Insulation Materials:
5.6 Class F–Duplex—S-glass fiber insulated (Note 1) not
7.2.1 Individual thermoeleme
...