外夹式或者管段式超声波流量仪表是以“速度差法”为原理，测量圆管内液体流量的仪表。它采用了先进的多脉冲技术、信号数字化处理技术及纠错技术，使流量仪表更能适应工业现场的环境，计量更方便、经济、准确。产品达到国内外先进水平，可广泛应用于石油、化工、冶金、电力、给排水等领域。
根据对信号检测的原理超声流量计可分为传播速度差法(直接时差法、时差法、相位差法和频差法)、波束偏移法、多普勒法、互相关法、空间滤法及噪声法等。
超声流量计和电磁流量计一样，因仪表流通通道未设置任何阻碍件，均属无阻碍流量计，是适于解决流量测量困难问题的一类流量计，特别在大口径流量测量方面有较突出的优点，它是发展迅速的一类流量计之一。
超声波流量计是一种非接触式仪表，它既可以测量大管径的介质流量也可以用于不易接触和观察的介质的测量。它的测量准确度很高，几乎不受被测介质的各种参数的干扰，尤其可以解决其它仪表不能的强腐蚀性、非导电性、放射性及易燃易爆介质的流量测量问题。
产品英文详情介绍
an outer tube stage ultrasonic clamp-on flow meter or on a speed difference method is a schematic, measuring the liquid flow meter tube. it uses an advanced multi-pulse technology, digital signal processing and error correction technology, the flow meter can adapt to the industrial field environments, more convenient dosing, economical and accurate. products reached international advanced level, can be widely used in petroleum, chemical, metallurgy, electric power, water supply and drainage and so on. the principle of the ultrasonic flowmeter signal detection can be divided into the propagation velocity difference method (direct difference method, difference method, the phase difference method and a frequency difference method), a beam shift method, the doppler method, a correlation method, the spatial filter method and noise method. ultrasonic flowmeter and the electromagnetic flowmeter, as a result of any obstruction meter flow path member is not provided, are unobstructed flow meter, flow measurement is adapted to solve difficult problems for a class of flowmeter, especially in the large diameter flow measurement more prominent the advantage, it is one of a rapidly growing class of flowmeter. ultrasonic flow meter is a non-contact instrument, it can measure both large diameter medium flow may be difficult to reach for measuring medium and observation. its measurement accuracy is high, almost no interference of various parameters of the measured medium, in particular, can not solve the flow measuring instruments other corrosive, non-conductive, radioactive and explosive media problems.
山东安耐自动化仪表有限公司
19953523917