Summary: YesUltrasonic flowmeterTwo-way stream metric undertook actual measurement is measured. Measure a result to show different production business produces ultrasonic flowmeter to measure precision to differ, when applying actually, should retrorse and metric precision is different characteristic, choose appropriate flowmeter.
Keyword: Tap water; Hydrometry; Ultrasonic flowmeter
The graph classifies date in: Label of document of TH814 　 piles up: Number of article of B 　 : 1009 - 2455 (2003) 02 - 0069 - 02
To strengthen business management, strengthen assessment, reduce produce and sale to differ, a lot of water department took home pattern of divisional and divisional water supply, metric management. A lot of cities of our country are much fountainhead water supply, put in divisional cop two-way stream, , must part metric and same root is defeated by conduit line to be defeated by water to measure to two direction. Taking this one issue, we two-way to ultrasonic flowmeter stream metric undertook study. L tests program
Orgnaization of national weights and measures technique two-way to ultrasonic flowmeter shed metric test to work to had not spread out completely, also do not have condition of experiment of this field level, , ourselves made experimental plan. Above all, the experiment must satisfy ultrasonic flowmeter main job environment, namely upper reaches is in charge of paragraph of length to be more than 10 D continuously (diameter) , be in charge of paragraph of length to be more than 5D continuously downstream; Next, experimental environment and photograph of actual application condition are consistent, be in charge of namely paragraph inside when current direction is changed, on ultrasonic flowmeter. The position is changeless related downstream sensor and lead plane, imitate ultrasonic flowmeter is measured actually two-way shed working environment.
Above requirement, deep well of a fountainhead regards make choice of as experimental object. Measure a canal paragraph do not have the steel tube that seam carbon for φ219, mural thick 7 Mm, velocity of flow is 2.0 M/s left and right sides, flow fluctuation is lesser, it is basically constant stream. Upper reaches is in charge of continuously paragraph be more than 50D, downstream straight canal paragraph be more than 30D. Measure a canal paragraph for type of built on stilts. Flange join, spot space is vast, installation and test condition all ideal. Test process uses relative standard watch and method of the other side that be compared by check watch line.
2 tests content reachs a result
This second experiment altogether has 7 ultrasonic flowmeter to attend a test.
FLB of ─ of A １ ─ entrancePortable ultrasonic flowmeter(relative standard is expressed) ;
FLC1 of A2 ─ ─ entrance is portable ultrasonic flowmeter (be expressed by check) ;
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