10001/R/1

10001/R/1

流量?jī)x表的選型對(duì)儀表能否成功使用往往起著很重要的作用，由于被測(cè)對(duì)象的復(fù)雜狀況以及儀表品種繁多、性能指標(biāo)各異，使得技術(shù)人員對(duì)儀表的選型感到困難。沒(méi)有一種十全十美的流量計(jì)，各類(lèi)儀表都有各自的特點(diǎn)，選型的目的就是在眾多的品種中揚(yáng)長(zhǎng)避短，選擇自己zui合適的儀表。

　　一般選型可以從五個(gè)方面進(jìn)行考慮，這五個(gè)方面為儀表性能方面、流體特性方面、安裝條件方面、環(huán)境條件方面和經(jīng)濟(jì)因素方面。五個(gè)方面的詳細(xì)分析如下：

　　1、儀表性能方面：準(zhǔn)確度、重復(fù)性、線(xiàn)性度、范圍度、流量范圍、信號(hào)輸出特性、響應(yīng)時(shí)間、壓力損失等；

　　2、流體特性方面：溫度、壓力、密度、粘度、化學(xué)腐蝕、磨蝕性、結(jié)垢、混相、相變、電導(dǎo)率、聲速、導(dǎo)熱系數(shù)、比熱容，等指數(shù)；

　　3、安裝條件方面：管道布置方向，流動(dòng)方向，檢測(cè)件上下游側(cè)直管段長(zhǎng)度、管道口徑、維修空間、電源、接地、輔助設(shè)備（過(guò)濾器、消氣器）、安裝、等；

　　4、環(huán)境條件方面：環(huán)境溫度、濕度、電磁干擾、安全性、防爆、管道振動(dòng)等；

　　5、經(jīng)濟(jì)因素方面：儀表購(gòu)置費(fèi)、安裝費(fèi)、運(yùn)行費(fèi)、校驗(yàn)費(fèi)、維修費(fèi)、儀表使用壽命、備品備件等。

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