BS EN ISO 204:2018 pdf free

BS EN ISO 204:2018 pdf free.Metallic materials一Uniaxial creep testing in tension-Method of test
The calibration of the temperature measuring equipment (including the cable, the connection, the cold junction, the indicator or the recorder, the data line, etc.) shall be carried out by a method traceable to the international unit (SI) of temperature.
If practicable, this calibration should be carried out annually over the range of temperatures measured by the equipment and the readings shall be given in the calibration report.
In single test piece machines, with thermocouples used for temperature measurement, at least two thermocouples should be used for test pieces with a parallel length less than or equal to 50 mm. For test pieces with a parallel length greater than 50 mm, at least three thermocouples should be used. In all cases, a thermocouple should be placed at each end of the parallel length and, if a third thermocouple is used, it should be placed in the middle region of the parallel length.
The number of thermocouples may be reduced to one if it can be demonstrated that the conditions of the furnace and the test piece are such that the variation of temperature of the test piece does not exceed the values specified in 6.3.1.
In multiple test piece machines, with thermocouples used for temperature measurement, at least one thermocouple should be used for each test piece. If only one thermocouple is used, it shall be positioned at the middle of the parallel length. Three thermocouples may only be used if located at appropriate positions within the furnace, and if there is supporting data to demonstrate that for all test pieces the temperature conforms to the requirements of 6.3.1.
The thermocouple junctions shall make good thermal contact with the surface of the test piece and shall be screened from direct radiation from the heating source. The remaining portions of the wires within the furnace shall be thermally shielded and electrically insulated.
Precautions shall be taken to minimize contamination and physical damage of thermocouples. Insulators and/or insulation shall be maintained in a clean state to also minimise contamination and prevent conduction.BS EN ISO 204 pdf download.