51305557-100

51305557-100

流量儀表的選型對儀表能否成功使用往往起著很重要的作用，由于被測對象的復(fù)雜狀況以及儀表品種繁多购狈、性能指標各異魂欺，使得技術(shù)人員對儀表的選型感到困難。沒有一種十全十美的流量計杂猾，各類儀表都有各自的特點虏绑，選型的目的就是在眾多的品種中揚長避短，選擇自己zui合適的儀表签子。

　　一般選型可以從五個方面進行考慮虫甲，這五個方面為儀表性能方面、流體特性方面塌瑞、安裝條件方面、環(huán)境條件方面和經(jīng)濟因素方面蛔六。五個方面的詳細分析如下：

　　1荆永、儀表性能方面：準確度、重復(fù)性国章、線性度具钥、范圍度、流量范圍液兽、信號輸出特性骂删、響應(yīng)時間、壓力損失等四啰；

　　2宁玫、流體特性方面：溫度、壓力、密度欧瘪、粘度眷射、化學(xué)腐蝕、磨蝕性佛掖、結(jié)垢只逐、混相、相變虚蹋、電導(dǎo)率荞亩、聲速、導(dǎo)熱系數(shù)抄娜、比熱容驾腕，等指數(shù)；

　　3憋屑、安裝條件方面：管道布置方向烟内，流動方向，檢測件上下游側(cè)直管段長度汽后、管道口徑面旋、維修空間、電源两胃、接地吟沮、輔助設(shè)備（過濾器、消氣器）专肪、安裝刹勃、等；

　　4嚎尤、環(huán)境條件方面：環(huán)境溫度荔仁、濕度、電磁干擾芽死、安全性乏梁、防爆、管道振動等关贵；

　　5遇骑、經(jīng)濟因素方面：儀表購置費、安裝費揖曾、運行費落萎、校驗費、維修費炭剪、儀表使用壽命练链、備品備件等翔脱。

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