Title:
Ultrasonic flowmeter simple diagnostic device
Document Type and Number:
Japanese Patent JP5957242
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To easily diagnose an adverse effect of an ultrasonic flowmeter on measuring accuracy resulting from a sound reverberation state in particular of a wave sound environment while setting the ultrasonic flowmeter to a measuring point as it is.SOLUTION: A sampling period in a normal mode of an ultrasonic flowmeter 13 of a diagnostic object is defined as an actual sampling period T0 and a sampling period of a long period determined in advance to be used in a diagnostic mode is defined as a reference sampling period T1. The reference sampling period T1 is determined as a time being sufficiently longer than a time which is assumed to be a time required to attenuate sound reverberation. A propagation time difference Δt(T0) in the actual sampling period T0 and a propagation time difference Δt(T1) in the reference sampling period T1 are acquired as a measuring characteristic of the ultrasonic flowmeter 13, and in the case of being |Δt(T1)-Δt(T0)|≥Δt_th, it is determined that there is effect of the sound reverberation. As the measuring characteristic, a measuring flow amount, a propagation time inverse number difference, a measuring flow rate, or the like can be adopted in addition to the propagation time difference.
Inventors:
Hiroshi Sasaki
Masato Tanaka
Masato Tanaka
Application Number:
JP2012045740A
Publication Date:
July 27, 2016
Filing Date:
March 01, 2012
Export Citation:
Assignee:
Azbil Co., Ltd.
International Classes:
G01F25/00; G01F1/66
Domestic Patent References:
| JP58125825U | ||||
| JP2003270014A |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa