GB/T 18036-2008The test method of thermo-emf for platinum (English PDF)
铂铑热电偶细丝的热电动势测量方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 31, 2008
Implementation date
September 1, 2008
Scope
GB/T 18036-2008 is the English-translated version of 铂铑热电偶细丝的热电动势测量方法.
GB/T 18036-2008 is the Chinese standard "The test method of thermo-emf for platinum". Its scope clause reads: This standard specifies the method for measuring the fuse and comparative law platinum and rhodium thermocouple wire thermal EMF.
This standard applies to the measurement of the diameter of platinum and rhodium thermocouple filaments within 0.05mm ~ 0.1mm range. Other precious metals and base metals heat Thermal EMF measuring galvanic filaments may also be referring to.
At the time of the measurement method using a fuse, measurable thermal emf value platinum and rhodium thermocouple wire diameter of 0.5mm. Other sizes of precious metals Belong to thermocouple wires thermal emf measurements can also be carried out with reference to.
Its clauses include principle of the method; measuring instruments, devices and materials.
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Document preview — GB/T 18036-2008
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 68
- Replacing
- GB/T 18036-2000
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 PRINCIPLE OF THE METHOD
- 4 Measuring instruments, devices and materials
1 Scope
This standard specifies the method for measuring the fuse and comparative law platinum and rhodium thermocouple wire thermal EMF.
This standard applies to the measurement of the diameter of platinum and rhodium thermocouple filaments within 0.05mm ~ 0.1mm range. Other precious metals and base metals heat
Thermal EMF measuring galvanic filaments may also be referring to.
At the time of the measurement method using a fuse, measurable thermal emf value platinum and rhodium thermocouple wire diameter of 0.5mm. Other sizes of precious metals
Belong to thermocouple wires thermal emf measurements can also be carried out with reference to.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 8170 numerical rounding rules
JC/T 509 ceramic thermocouple protection tube
JJF1059 Evaluation and Expression of Uncertainty in Measurement
3 PRINCIPLE OF THE METHOD
3.1 Fuse law
According to a pure metal melting temperature constant and thermocouple intermediate metal law, with a small amount of pure gold or palladium measured thermocouple wire wound
On the measurement side, warmed to thermal emf value of the platform, is measured on the thermocouple wires melting occurs, take the average of the readings as the measuring platform result.
3.2 Comparison Method
Thermocouple and standard thermocouple measured bundled together in gold (1064.18 °C) or palladium point (1554.8 °C) temperature than the neighborhood
Comparing, measuring thermal electromotive force value, calculate the results.
4 Measuring instruments, devices and materials
4.1 instruments and equipment
4.1.1 Low potential DC
Accuracy of not less than 0.01 and its corresponding supporting devices, or other equivalent electrically similar accuracy
Measuring equipment.
4.1.2 High temperature furnace
high-temperature furnace and automatic temperature-control system, furnace length of about 500mm or so, the maximum temperature should reach 1600 °C; furnace
The highest temperature area is off-center position should not exceed 20mm, its average temperature zone length should not be less than 10mm, the temperature difference should be within ± 1 °C of.
4.1.3 thermocouple wire annealing apparatus energized
power supply unit should be equipped with an accuracy of not less than 0.5 meter AC current governor and the like.
4.1.4 Thermocouple measuring end welding apparatus (by comparison)
welding thermocouples pollution.
4.1.5 PtRh30-PtRh6 standard thermocouple (comparison method used)
Even with its fuse method in gold (1064.18 °C) and palladium point (1554.8 °C)
Temperature indexing, indexing error should be less than 0.5 °C.
4.2 Material
4.2.1 Fuse
gold, palladium fuse purity of not less than 99.99%, and a diameter of 0.3mm, clean, soft annealed state.
4.2.2 support line
platinum wire, purity of not less than 99.95%, a diameter of 0.4mm ~ 0.5mm, clean.
4.2.3 bundle ligation
platinum wire diameter of 0.15mm, 0.25mm.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Cited by
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Editions of GB/T 18036
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 18036-2008 | The test method of thermo-emf for platinum | current edition | Current |
| GB/T 18036-2000 | The test method of thermo-emf for platinum | previous edition | Superseded |
This page sells the current edition, GB/T 18036-2008. Earlier editions are listed for reference only.
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