在維薩(sa)拉露點變送器的(de)(de)選用上主要依(yi)據:以(yi)被(bei)測(ce)介質的(de)(de)性質指(zhi)標(biao)為準,以(yi)節約資(zi)金、便于安裝和維護(hu)為參(can)考。

　　在選(xuan)型時(shi)要(yao)(yao)考(kao)慮它(ta)的(de)(de)介質(zhi)對(dui)膜(mo)盒(he)(he)金(jin)屬的(de)(de)腐(fu)蝕,要(yao)(yao)選(xuan)好膜(mo)盒(he)(he)材質(zhi),否則使用后很短(duan)時(shi)間(jian)就會將(jiang)外(wai)膜(mo)片腐(fu)蝕壞,所以材質(zhi)選(xuan)擇重要(yao)(yao)。露點變(bian)送器的(de)(de)膜(mo)盒(he)(he)材質(zhi)有(you)普通不(bu)銹鋼(gang)(gang)(gang)、304不(bu)銹鋼(gang)(gang)(gang)、316L不(bu)銹鋼(gang)(gang)(gang)、鉭膜(mo)盒(he)(he)材質(zhi)等(deng)等(deng)。

　　在(zai)選(xuan)型(xing)時要考(kao)慮被測介質的溫(wen)(wen)度(du),如果(guo)溫(wen)(wen)度(du)高一般為200C~400C,要選(xuan)用高溫(wen)(wen)型(xing),否則硅油會產生(sheng)汽化(hua)膨(peng)脹,使(shi)測星不準。

　　在選型時要考慮設備工作壓力等級，維(wei)薩拉露點(dian)變(bian)(bian)送(song)器(qi)的壓(ya)力(li)(li)等(deng)級(ji)與(yu)應(ying)用(yong)場合(he)相符合(he)。從經濟角度(du)上講,外(wai)膜盒及插(cha)入(ru)部分(fen)材質(zhi)比較露點(dian)變(bian)(bian)送(song)器(qi)，選用(yong)螺紋(wen)連接形(xing)式(shi)的,這(zhe)樣既節約資金安(an)裝(zhuang)又方(fang)便(bian)，對于普(pu)通壓(ya)力(li)(li)和(he)差(cha)壓(ya)露點(dian)變(bian)(bian)送(song)器(qi)選型(xing),也要(yao)考(kao)慮被測介質(zhi)的腐蝕(shi)性問(wen)題,但使用(yong)的介質(zhi)溫(wen)(wen)(wen)度(du)可以不考(kao)慮,因(yin)為(wei)普(pu)通型(xing)壓(ya)變(bian)(bian)是(shi)引(yin)壓(ya)到(dao)表(biao)內,長期工(gong)作(zuo)溫(wen)(wen)(wen)度(du)為(wei)常溫(wen)(wen)(wen),但普(pu)通型(xing)使用(yong)的維護量(liang)要(yao)比隔離型(xing)大。先是(shi)保(bao)溫(wen)(wen)(wen)問(wen)題,在北方(fang)冬(dong)季(ji)零(ling)下,導壓(ya)管會結冰,露點(dian)變(bian)(bian)送(song)器(qi)無法工(gong)作(zuo)甚至損壞,這(zhe)就需要(yao)增(zeng)加(jia)伴熱和(he)保(bao)溫(wen)(wen)(wen)箱(xiang)等(deng)。

　　從經濟角度上來講,選用維(wei)薩(sa)拉露(lu)點(dian)變送器時,只要不(bu)是易結晶介(jie)(jie)質都可以(yi)采用(yong)(yong)普通型(xing)露(lu)點(dian)變送器,而且對于(yu)低壓易結晶介(jie)(jie)質也可以(yi)加吹持掃(sao)介(jie)(jie)質來(lai)間接(jie)測量(只要工藝允許用(yong)(yong)吹掃(sao)液或氣い),應用(yong)(yong)普通型(xing)露(lu)點(dian)變送器就是要求維護人員多(duo)進行定(ding)時檢查(cha),包括各種導壓管(guan)是否(fou)泄漏、吹掃(sao)介(jie)(jie)質是否(fou)正常、保溫是否(fou)良好等,只要維護好,大量使用(yong)(yong)普通型(xing)露(lu)點(dian)變送器投資會節約很多(duo)。

　　維薩拉露點變(bian)送(song)(song)(song)(song)(song)器(qi)(qi)大(da)體(ti)分為壓(ya)力(li)露點變(bian)送(song)(song)(song)(song)(song)器(qi)(qi)和差壓(ya)露點変送(song)(song)(song)(song)(song)器(qi)(qi)。露點變(bian)送(song)(song)(song)(song)(song)器(qi)(qi)常用來(lai)測(ce)(ce)(ce)量(liang)(liang)壓(ya)力(li)、差壓(ya)、真空、液(ye)位(wei)、流量(liang)(liang)和密度等。露點變(bian)送(song)(song)(song)(song)(song)器(qi)(qi),除測(ce)(ce)(ce)量(liang)(liang)壓(ya)力(li)外,它(ta)還可(ke)(ke)以(yi)測(ce)(ce)(ce)量(liang)(liang)設備內(nei)的液(ye)位(wei)。露點變(bian)送(song)(song)(song)(song)(song)器(qi)(qi)除了測(ce)(ce)(ce)量(liang)(liang)兩個被測(ce)(ce)(ce)量(liang)(liang)壓(ya)力(li)的差壓(ya)值外,它(ta)還可(ke)(ke)以(yi)配合各(ge)種節流元(yuan)件來(lai)測(ce)(ce)(ce)量(liang)(liang)流量(liang)(liang),可(ke)(ke)以(yi)直接(jie)測(ce)(ce)(ce)量(liang)(liang)受壓(ya)容(rong)器(qi)(qi)的液(ye)位(wei)和常壓(ya)容(rong)器(qi)(qi)的液(ye)位(wei)以(yi)及壓(ya)力(li)和負壓(ya)。