The orifice plate flowmeter designed,manufactured and calibrated according to the national standard does not need real-flow calibration.Xi'an Huaheng Instrument introduces that the orifice plate has high accuracy,simple structure and low manufacturing cost,but the pressure loss is the largest in all standard throttling devices,and it is not suitable for situations requiring low pressure loss.The standard orifice plate is widely used in petroleum,chemical,metallurgical,power and other industries.

 

　　孔板流量計按國標(biāo)規(guī)定制作以及特點要求

 

　　Orifice Flowmeter Made in accordance with National Standard and Its Characteristic Requirements

 

　　1、一體化孔板流量計是測量流量的差壓發(fā)生裝置，配合各種差壓計或差壓變送器可測量管道中各種流體的流量，孔板流量計節(jié)流裝置包括環(huán)室孔板，噴嘴等。

 

　　1.Integrative orifice flowmeter is a differential pressure generating device for measuring flow.It can measure the flow of various fluids in pipeline with various differential pressure meters or differential pressure transmitters.The orifice flowmeter throttling device includes annular orifice plate,nozzle and so on.

 

　　2、智能型孔板流量計是集流量、溫度、壓力檢測功能于一體，并能進(jìn)行溫度、壓力自動補償?shù)男乱淮髁坑?，該孔板流量計采用先進(jìn)的微機技術(shù)與微功耗新技術(shù)，功能強、結(jié)構(gòu)緊湊、操作簡單、使用方便等特點。

 

　　2.Intelligent orifice flowmeter is a new generation flowmeter which integrates flow,temperature and pressure detection functions and can automatically compensate temperature and pressure.The orifice flowmeter adopts advanced computer technology and new micro-power consumption technology.It has the characteristics of strong function,compact structure,simple operation and convenient use.

 

　　盡管孔板流量計以其獨特的優(yōu)勢在眾多領(lǐng)域有所應(yīng)用，但是在使用中也存在下面的缺點：

 

　　Although orifice flowmeter has been applied in many fields because of its unique advantages,there are also the following shortcomings in use:

 

　　1、測量的重復(fù)性、精確度在流量傳感器中屬于中等水平，由于眾多因素的影響錯綜復(fù)雜，精確度難于提高;

 

　　1.The repeatability and accuracy of measurement belong to the medium level in the flow sensor.Because of the complex influence of many factors,it is difficult to improve the accuracy.

 

　　2、范圍度窄，由于流量系數(shù)與雷諾數(shù)有關(guān),一般范圍度僅3∶1～4∶1;

 

　　2.The range is narrow.Because the discharge coefficient is related to Reynolds number,the general range is only 3:1-4:1.

 

　　3、有較長的直管段長度要求，一般難于滿足。尤其對較大管徑，問題更加突出;

 

　　3.It is difficult to satisfy the requirement of long straight pipe length.Especially for larger diameter,the problem is more prominent.

 

　　4、壓力損失大;

 

　　4.Great pressure loss;

 

　　5、孔板以內(nèi)孔銳角線來保證精度，因此傳感器對腐蝕、磨損、結(jié)垢、臟污敏感，長期使用精度難以保證，需每年拆下強檢一次;

 

　　5.The orifice plate guarantees the accuracy by the sharp angle line of the inner hole.Therefore,the sensor is sensitive to corrosion,wear,scaling and dirt.It is difficult to guarantee the long-term accuracy,so it needs to be disassembled and inspected once a year.

 

　　6、采用法蘭連接，易產(chǎn)生跑、冒、滴、漏問題，大大增加了維護(hù)工作量。

 

　　6.Flange connection is easy to cause problems of running,running,dropping and leakage,which greatly increases the maintenance workload.