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See Chinese contents: JJG 1030-2007 JJG 1030-2007: Verification Regulation of Ultrasonic Flowmeters
This Regulation is applicable to the type evaluation, initial verification, subsequent verification and in-use inspection of ultrasonic flowmeters for closed pipes, which takes time difference method as the principle. This Regulation is not applicable to the verification of ultrasonic flow measuring instrument in open conduits and closed conduits.
