As we all know,Air tightness testing equipmentThe accuracy is very critical. In various detection processes, whether the detection is accurate and whether the detection work can be carried out efficiently must be well controlled.Air tightness testing equipmentThe accuracy ofAir tightness testing equipmentWhat are the factors of accuracy?as high precisionAir tightness testing equipmentThe founder ofAir tightness testing equipmentSeveral years of research have concluded 4 impactsAir tightness testing equipmentaccuracy factor.

1. Affected by detection pressure    

The dependence of the leakage rate on the test pressure is different for different measurement conditions.Generally speaking, when the porosity (such as casting bubbles, cracks) is high, the test pressure has a greater impact on the leakage rate, while when the porosity is low, the impact is smaller.In addition, as the test pressure increases, there will also be a series of problems such as temperature effects and longer stabilization time required.Therefore, it is recommended that specific workpieces be tested for leaks within a certain pressure range, and then a lower pressure that meets the test requirements is selected as the final test pressure.The selection of the leak test pressure of the leak tester must fully consider the ability of each mechanism of the tested part to withstand the maximum test pressure.  

2. Affected by the detection volume

At a specific leak rate value, if the detection volume increases, the corresponding pressure decreases at a lower rate, so the measurement time needs to increase accordingly.Under some specific conditions, if no means are found to reduce the measurement volume, the sensitivity required for measurement may not be achieved.

3. The impact of stabilization time on detection   

When inflating, the compressed air will enter a closed container due to the pressurized state, causing a series of thermodynamic-kinetic changes. That is, when a certain volume of compressed air is quickly moved to a closed container, its pressure will decrease. If measured at this time, this pressure change will be regarded as a pressure change caused by leakage, affecting the accuracy of the measurement results.This kind of“charge effect&”Affected by inflation pressure, test volume and test piece material.This inflation-induced pressure reduction becomes apparent as the inflation pressure or test volume increases.One solution to this problem is to add a settling time between inflation and measurement to eliminate this effect.The length of the stabilization time needs to be determined according to the specific measurement object.   

4. Effect of temperature on detection    

For gases in a closed container, when the temperature increases, the pressure inside the container increases.Therefore, temperature changes inevitably become an important factor affecting pressure changes.It is generally estimated that the range of this effect is roughly 0.36% of the measured pressure value for every 1°C change in temperature.Therefore, as the test pressure increases, the effect of temperature becomes obvious.

So, when usingAir tightness testing equipmentDuring the process, we must pay great attention to the above four major points and some related details. In this way, our inspection work will be smoother and more efficient.