Analysis of differential pressure based air leak tester

To satisfy the growing need for leak tight product, we develop a differential pressure based air leak tester applicable under high pressure up to 800kPa, low cost and accurate up to 0.001cc/min. Here, leak is simply detected by measuring the differential pressure occurs between a Master and Tested chamber. The results demonstrate that inadequate temperature recovery time produce inaccuracy to the leak detection and need to be considered when this method is utilized. The relation of the required temperature recovery time and thermal time constant is studied and proposed to estimate the required temperature recovery time that can be used to increase the accuracy of the leak detection. The effectiveness of the method is demonstrated in this research.