51305776-100

51305776-100

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

　　一般選型可以從五個(gè)方面進(jìn)行考慮步咪，這五個(gè)方面為儀表性能方面论皆、流體特性方面、安裝條件方面猾漫、環(huán)境條件方面和經(jīng)濟(jì)因素方面点晴。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)性粒督、線性度陪竿、范圍度、流量范圍屠橄、信號(hào)輸出特性播窒、響應(yīng)時(shí)間、壓力損失等筷资；

　　2挨这、流體特性方面：溫度、壓力胃宰、密度嘹冀、粘度、化學(xué)腐蝕垦适、磨蝕性朽突、結(jié)垢、混相矛塑、相變析口、電導(dǎo)率、聲速借街、導(dǎo)熱系數(shù)惦参、比熱容，等指數(shù)听想；

　　3腥刹、安裝條件方面：管道布置方向，流動(dòng)方向汉买，檢測件上下游側(cè)直管段長度衔峰、管道口徑、維修空間蛙粘、電源垫卤、接地、輔助設(shè)備（過濾器出牧、消氣器）穴肘、安裝、等舔痕；

　　4评抚、環(huán)境條件方面：環(huán)境溫度、濕度伯复、電磁干擾慨代、安全性邢笙、防爆、管道振動(dòng)等品昭；

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

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