ULPA

It is important to test the concentration of test aerosol accurately for HEPA / ULPA filter efficiency testing .

HEPA/ULPA效率测试中气溶胶浓度的准确检测至关重要。

Therefore , a primary research and discuss on optimized design for geometry parameters of piezocrystals and wedges in ULPA were taken in this study .

因此本研究从晶片和楔块两方面对超声相控线阵换能器的几何优化设计进行了初步研究和探讨。

Study on Performance of HEPA ﹠ ULPA Filter Media Based on the MPPS Method ; The result gave the optimal filter particle diameter , layer thickness and filtration velocity .

高效、超高效空气滤纸最易穿透粒径法实验性能研究根据实验结果，确定了最佳的过滤介质粒径、过滤层厚度和过滤速度。

HEPA / ULPA filter installation leak test . This test is performed to verify that the filters have been properly installed and are free of leaks .

HEPA/ULPA过滤器现场泄漏试验。该项测试用于检验滤器已正确地安装，没有泄漏现象。