IEC 60751-2008 pdf free download – Industrial platinum resistance thermometers and platinum temperature sensors.
6.1General
Tests shall be carried out to prove that resistors or thermometers comply with therequirements of this standard.
lt is not intended or recommended that all tests should be carried out on every resistor orthermometer supplied.Different kinds of tests are therefore described in this clause.
6.1.1 Routine production tests
Routine production tests shall be carried out on every resistor or thermometer manufacturedin accordance with this standard.These tests are also included in the specified type tests.
6.1.2Type tests
Type tests shall be carried out on samples of each particular design and range of resistor orthermometer.These are subdivided into tests for all forms of resistors or thermometers.
6.1.3Additional type tests
Additional type tests may be required by other regulations or be agreed betweenmanufacturer and user for special applications. lf not stated otherwise, there are no fixedspecifications for these test items.The results of the tests shall be made available on request.
6.2Routine production tests for resistors
6.2.1 Tolerance acceptance test
All types of resistors shall be tested at one temperature at least.The test temperature shall bein the range from -5 C to +30°c, preferably o °c.
Resistors of the tolerance classes 0.15 or better shall be tested at one additional temperatureat least.This test temperature shall be the upper or lower temperature limit of the resistor,orspaced from the first test temperature by a minimum of 90 °C, whichever is less.
The manufacturer shall guarantee that resistances are within the specified tolerance class.When selecting the resistors，the measurement uncertainty of the test has to be taken intoaccount.An example is given in Figure 2: if measured by the manufacturer, only resistor No.1is within the tolerance class. lf measured by the customer, only resistor No. 4 can be rejected.
Therefore, the selection criteria for the manufacturer to use are as follows: the result of thetest，expressed as a temperature deviation，when added to the corresponding expandeduncertainty, shall be totally included within the tolerance band.
The rejection criteria for the user are as follows: the tolerance value is not met if the result ofthe test， expressed as a temperature deviation， when added to the corresponding expandeduncertainty, is totally outside the tolerance band.
6.3Routine production tests for thermometers
6.3.1 Insulation resistance at ambient temperature
The insulation resistance between each terminal and the sheath shall be tested with a testvoltage at minimum 100 v d.c.
The insulation resistance shall be not less than 100 MQ.
6.3.2Sheath integrity test
The integrity of the sheath and all closure weldings shall be tested by suitable means,forexample the following tests:
6.3.2.1Water quench test
The thermometer shall be subjected to a minimum temperature of 300 °C for a minimum timeof 5 min and then immediately plunged into water at room temperature. Then the insulationresistance shall be measured while the thermometer is immersed.The insulation resistanceshall meet the requirements of 6.5.1.
6.3.2.2 Nitrogen pressure test
The thermometer shall be externally pressurized for approximately 30 s at a minimumpressure of 2.5 MPa in a nitrogen gas， after which the thermometer shall be immediatelyimmersed in water or alcohol.There shall be no bubbling from the weld.
6.3.2.3Liquid nitrogen test
The thermometer shall be immersed in liquid nitrogen until the temperature is stabilized, afterwhich the thermometer shall be immediately immersed in water or alcohol.There shall be nobubbling from the weld.IEC 60751 pdf download.