Traceability is urgent to guarantee the truth of measurement, particularly for National Standard. Although a bell prover facility has established as the national low pressure gas flow standard of Indonesia since 2008, the measurement capability (15 to 1400 L/min, U₉₅ = 0.20%) of the bell prover has not been traceable to SI Units. Moreover, displacement values provided by the bell prover’s manufacturer by rotary encoder method are still used. The limit detector by optical sensor to measure displacement is worthy to achieve dimensional traceability which can be switched by ultrasonic sensor for reasonable solution. The aim of this study is to improve the traceability of the bell prover by reasonable solution and then validate the gas volume flow rate measurement by inter-laboratory comparison. The Center for Measurement Standards (CMS), Industrial Technology Research Institute (ITRI), was invited to participate in the bilateral comparison, and a gas turbine flow meter was used as the transfer standard. The bell prover has been successfully traceable to SI units, particularly displacement measurement through flying start/stop method by limit of ultrasonic sensor (250 to 1200 L/min, U₉₅ = 0.80% passing assessment report). Despite having larger uncertainty than manufacturer specification, the results are better for more in of layer comparison. Because the effect of turbine drift should be a concern, the gap of measurement time for inter-laboratory comparison is recommended to minimize as many as possible. Furthermore, the measurement range of bell prover should be reduced as reasonability purpose.

为了保证测量的真实性，可追溯性迫在眉睫，尤其是对于国家标准而言。自2008年以来，尽管钟声检定设备已确立为印度尼西亚的国家低压气体流量标准，但其测量能力（15至1400 L / min，U ₉₅ = 0.20％）的响铃证明者无法追溯到SI单位。而且，仍然使用由钟罩证明者的制造商通过旋转编码器方法提供的位移值。用光学传感器测量位移的极限检测器值得实现尺寸可追溯性，超声传感器可以切换该尺寸检测器以获得合理的解决方案。这项研究的目的是通过合理的解决方案来提高钟形仪的可追溯性，然后通过实验室间的比较来验证气体体积流量测量。工业技术研究院（ITRI）的测量标准中心（CMS）被邀请参加双边比较，并且使用燃气轮机流量计作为传输标准。贝尔证明人已经成功地追溯到国际单位制，U ₉₅  = 0.80％通过评估报告）。尽管不确定性大于制造商的规范，但在进行更多层比较时，结果还是更好的。由于应该考虑涡轮漂移的影响，因此建议在实验室之间进行比较的测量时间间隔应尽可能小。此外，作为合理的目的，应减小钟形仪的测量范围。