51305348-100

51305348-100

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豪椿、性能指標(biāo)各異奔坟，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祸弥，各類儀表都有各自的特點偎旱，選型的目的就是在眾多的品種中揚長避短，選擇自己zui合適的儀表迁拂。

　　一般選型可以從五個方面進行考慮地捂，這五個方面為儀表性能方面、流體特性方面掸校、安裝條件方面滤重、環(huán)境條件方面和經(jīng)濟因素方面。五個方面的詳細(xì)分析如下：

　　1涮巩、儀表性能方面：準(zhǔn)確度鲫庆、重復(fù)性、線性度矩沥、范圍度掏榜、流量范圍、信號輸出特性咪干、響應(yīng)時間络兜、壓力損失等；

　　2部翘、流體特性方面：溫度硝训、壓力、密度新思、粘度窖梁、化學(xué)腐蝕、磨蝕性表牢、結(jié)垢窄绒、混相、相變崔兴、電導(dǎo)率彰导、聲速、導(dǎo)熱系數(shù)敲茄、比熱容位谋，等指數(shù)山析；

　　3、安裝條件方面：管道布置方向掏父，流動方向羽嘉，檢測件上下游側(cè)直管段長度、管道口徑鹏亥、維修空間反腺、電源、接地脾飘、輔助設(shè)備（過濾器聊浊、消氣器）、安裝短连、等斩缘；

　　4、環(huán)境條件方面：環(huán)境溫度根术、濕度泳隶、電磁干擾、安全性涮侥、防爆灭大、管道振動等；

　　5琅翻、經(jīng)濟因素方面：儀表購置費位仁、安裝費柑贞、運行費方椎、校驗費、維修費钧嘶、儀表使用壽命棠众、備品備件等。

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