介绍了管外夹装式超声波流量计的基本原理、类型及其最新进展；

Principles, types and latest development jacketed ultrasonic flowmeter are also introduced.

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介绍了热量表采用的电磁式、超声波式、机械式流量计的技术特点。

The technical characteristics of electromagnetic, ultrasonic and mechanical flowmeters used in heat meters are introduced.

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文章指出采用便携式超声波流量计可以实现在线大口径流量计的检测及校准，并介绍了检测步骤和检测时需要满足的条件。

This article points out that using the portable ultrasonic flowmeter can realize the large-caliber flowmeters on-line testing and calibration.

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