Changes of IEC60695 Glow Wire Tester Standard Requirements

August 17, 2018

IEC 60695-2-10, Ed 2.0 (2013-04)为灼热丝试验新版国际标准,它对灼热丝实验装置的主要部件——灼热丝的尺寸上进行了一些修订。
IEC 60695-2-10, Ed 2.0 (2013-04) is a new international standard for glow wire experiment. It has made some modifications on glow wire.


Let's take a look at the new edition standard. What is the difference between the old standard and new standard?

IEC 60695-2-10, Ed 2.0 (2013-04)新版标准对其中的相关术语和定义、以及实验设备作出了较大的修改,而在具体应用中,表现为:
The new version of IEC 60695-2-10, Ed 2.0 (2013-04) has made major modifications on relevant terms and definitions, as well as experimental equipment, and in the specific application, the
performance is:

Change Of Test Equipment


首先,新标准对热电偶的直径规定,使得使用0.5mm 的热电偶的设备不再满足标准要求。
First of all, the new standard rule for thermocouple diameter makes the device that uses 0.5mm thermocouple no longer meet the standard requirements.

Second, the new standard is more explicit in the changing rangeof device that puts pressure on the device, and force is also more precisely required.


最后,新标准对灼热丝(未弯曲前)直径的规定,足见对灼热丝的材料加工 前要求更高。
Finally, the new standard rules on the diameter of the glow wire(unbent), which requires a higher level of glow wire material before being processed.


Owing to changes of equipment parameters ,the changes of the above parameters need to be paid attention to when checking and measuring equipment. In addition, due to the bending of the process,the material will be deformed, so we should pay special attention to this.

Change Of Operation Steps


Before testing glow wire test, we need to measure glow wire diameter and compare with previous data of last test, if the size reduce to 97.5% of original reading, then change a glow wire.

原来的标准中虽然也有对灼热丝直径测量的要求,但由于限值较小,使得在测试中没有重视这个步骤。以标准的灼热丝直径为例,即4.00mm 的灼热丝。新版标准中,限值为4×0.975=3.9mm。而在旧版标准中限值为4×0.9=3.6mm。由于测试的样品为非金属材料,测试过程中,灼热丝和材料虽有接触,但对灼热丝本身不造成损伤,即直径减少。只是在测试后,需要对灼热丝头上的残留物清洁的过程中,使用的钢刷会对灼热丝造成一定的伤害。

Although there are requirements for measuring diameter of glow wire in original standard, due to the small limit value, this step is not emphasized in the test. Take standard glow wire diameter as an example, that’s 4.00mm. In new version, the limit is 4 x 0.975 = 3.9 mm. In old standard, the limit is 4 x 0.9 = 3.6 mm. Because the tested samples were non-metallic materials, the hot wire and materials were connected in the test process, however they do not cause damage to the glow wire itself.That’s to say,the diameter wasn’t reduced. Only when after testing, will the steel brush used in the process of cleaning the residue on the glow wire head do some damage to the glow wire.

In accordance with the requirements of the new standards, the equipment and program files involved in the standard have beenrevised. Through the measurement and observation lasting one year,
the steel brush brushes the glow wire once a week. After each brush,measure the diameter of glow wire.Because each time the force isinconsistent, one person measures it at a same location.After 10 times ,its diameter is measure to reduce by 0.02 mm (compared with firstly measured value). The reduction was 0.03 mm after 20 times.
Subsequently, due to the damage of the thermocouple, clean the hole of glowwire,replace the thermocouple and continue to measure thermocouple diameter. Finally, the thermocouple is damaged,because it cannot clean the holes,the glow wire needs to be replaced.


The implementation of the new standard has led to a great change in the test equipment and test operation.