Optimizing the Performance of the Compare II Leak Calibration System

T. A. Moss, H. Case
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Abstract

The Compare II leak calibration system at Sandia National Laboratories has been used for the secondary calibration of leaks for over 30 years. This system calibrates leaks by the direct comparison of an unknown leak with a standard reference leak using a commercial leak detector. Over the years the leak detector remained the same but other components were changed such as replacing the oil diffusion pump with a turbomolecular pump, a new temperature chamber for the unknown leak, and using a molecular drag pump instead of a rotary vane pump. Testing on this system was conducted for two reasons. First was to determine the optimum operating conditions to enable this system to be used at peak efficiency. The second is this system is planned to be replaced with a newer system in the near future and this testing will help in determining the new system's requirements. Some of the tests, for example, was determining the time for the leak rate to stabilize when first installed on the system prior to calibration, and for the leak rate to stabilize when switching between the standard and unknown leak. Data for these and other tests conducted to optimize the performance of the Compare II leak calibration system are presented. The resulting improvements reduced calibration time from 9 hours to 5 hours and increased the number of leaks calibrated per week from 3 to 5, which significantly increased operational efficiency and reduced turnaround time for the customer.
比较II泄漏校准系统的性能优化
桑迪亚国家实验室的Compare II泄漏校准系统已用于泄漏的二次校准超过30年。该系统通过使用商用泄漏检测器将未知泄漏与标准参考泄漏进行直接比较来校准泄漏。多年来,泄漏检测器保持不变,但其他组件发生了变化,例如用涡轮分子泵代替油扩散泵,为未知泄漏更换新的温度室,并使用分子阻力泵代替旋转叶片泵。对该系统进行测试有两个原因。首先是确定最佳操作条件,使该系统能够以最高效率使用。第二,这个系统计划在不久的将来被一个更新的系统所取代,这个测试将有助于确定新系统的需求。例如,一些测试是确定在校准之前首次安装在系统上时泄漏率稳定的时间,以及在标准泄漏和未知泄漏之间切换时泄漏率稳定的时间。为优化Compare II泄漏校准系统的性能,本文给出了这些和其他测试的数据。由此产生的改进将校准时间从9小时减少到5小时,并将每周校准的泄漏次数从3次增加到5次,这大大提高了操作效率并减少了客户的周转时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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