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本文简要介绍了超声波速差法气体流量计的性能，及利用调温调湿风洞和煤气厂储气相对直径为φ700mm的大口径超声气体流量计进行喷嘴法和体积法（钟罩法）标定的原理、过程及测量结果。
In this paper, the performance of the ultrasonic velocity difference gas flowmeter is briefly introduced, and the nozzle method and the volume method (bell method) are used to calibrate the large diameter ultrasonic gas flowmeter with the diameter of φ700mm The principle, process and measurement results.