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Standard Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples
Automaticky preložený názov:
Štandard Specification pre minerálnou izoláciou, okovanými základných kovov termočlánky
NORMA vydaná dňa 1.11.2013
Označenie normy: ASTM E608/E608M-13
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.11.2013
Kód tovaru: NS-47399
Počet strán: 8
Približná hmotnosť: 24 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
base metal thermocouples, junction, metal-sheathed, moisture seal, sheathed thermocouples, termination, thermocouple, thermoelement, ICS Number Code 17.200.20 (Temperature-measuring instruments)
Significance and Use | ||||||||||||||||||
4.1 This specification describes the physical requirements of mineral-insulated, metal-sheathed base metal thermocouples and establishes suitable test criteria for their evaluation. 4.2 Standardized dimensional requirements and acceptable allowances for manufacturing variations, are given. 4.3 A set of standard tests to be applied to all thermocouples covered by this specification are described, in addition to optional tests from which applicable additional requirements may be selected. 4.4 Warning—Users should be aware that certain characteristics of thermocouples might change with time and use. 4.4.1 If a thermocouple's designed shipping, storage, installation, or operating temperature has been exceeded, the thermocouple’s moisture seal may have been compromised and may no longer prevent the deleterious intrusion of water vapor. Consequently, the thermocouple's condition established by test at the time of manufacture may not apply later after an extended period of use, and retesting may become necessary. 4.4.2 In addition, inhomogeneities can develop in thermoelements because of exposure to temperature, even in cases where the maximum exposure temperatures have been lower than the suggested upper temperature limits of Table 1. For this reason, calibration of thermocouples destined for delivery to a customer is not recommended (see S6.1). 4.4.3 Furthermore, because the EMF
indication of any thermocouple depends upon the condition of the
thermoelements along their entire length, as well as the
temperature profile pattern in the region of any inhomogeneity, the
EMF output of a used thermocouple will be unique to its
installation. Because temperature profiles in calibration equipment
are unlikely to duplicate those of the installation, removal of a
used thermocouple to a separate apparatus for calibration is not
recommended. Instead, in-situ calibration by comparison to a
similar thermocouple of known accuracy is recommended.
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1. Scope | ||||||||||||||||||
1.1 This specification covers the requirements for mineral-insulated, metal-sheathed base metal thermocouples for industrial or high-reliability applications. It applies specifically to thermocouples fabricated from sheathed thermocouple material in accordance with Specification E585/E585M. The specification provides for the selection of thermoelements, insulation, sheath material, measuring junction configuration, thermocouple assembly length, and the type of transition or termination. 1.2 This specification also includes provisions for either quality assurance or verification program requirements, or both, as a purchaser’s option. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.4 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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2. Referenced Documents | ||||||||||||||||||
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