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壓力表的選擇、安裝及維護(hù)

時(shí)間:2011/11/10閱讀:738
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 如何選擇壓力表

.一般壓力表的彈簧管是具有一定橫截面形狀 ( 常用的有扁平圓和近似橢圓形兩種 ) ,波折成 “C” 形,而且能滿足一定彈性懇求的管狀彈簧。如果彈簧管太小,就會(huì)影響壓力表的準(zhǔn)確度等級(jí)。
.壓力表的示值超過允許誤差,就應(yīng)該調(diào)修該表的示值調(diào)節(jié)螺釘,如果該表沒有示值調(diào)節(jié)螺釘,此表只能判為不合格。
.壓力表表盤分度數(shù)字及符號(hào)應(yīng)完整明白。表盤分度標(biāo)尺應(yīng)均勻分布、所包的中心角一般為, 壓力表的指針應(yīng)伸入所有分度線內(nèi),其指針教唆端寬度應(yīng)不大于zui小分度間隔的/。指針與分度盤平面間的距離應(yīng)在~mm范圍內(nèi)表殼外徑在mm以上的(包括mm),其指針與分度盤平面距離應(yīng)在~mm范圍內(nèi)。
.帶有止銷的壓力表,在無壓力或真空時(shí)指針應(yīng)緊靠止銷, “ 縮格 ” 不得超過規(guī)定的允許誤差。
.壓力表表殼應(yīng)能保護(hù)內(nèi)部機(jī)件不受污染,壓力表應(yīng)裝有安全孔,安全孔上需有防塵裝置。
.數(shù)字壓力表。則要看整體結(jié)構(gòu)的合理性、所選取的材質(zhì)、電子元器件的老化工藝、長(zhǎng)期牢固性等。
壓力表的安裝
.壓力表的安裝位置應(yīng)符合安裝狀態(tài)的懇求,表盤一般不應(yīng)水平放置,安裝位置的高低應(yīng)便于工作人員觀測(cè)。
.壓力表安裝處與測(cè)壓點(diǎn)的距離應(yīng)盡量短,要保證完好的密封性,不能浮現(xiàn)泄漏現(xiàn)象。
.在安裝的壓力表前端應(yīng)有緩沖器;為便于檢驗(yàn),在儀表下方應(yīng)www.jsatm.com裝有切斷閥;當(dāng)介質(zhì)較臟或有脈沖壓力時(shí),可采用過濾器、緩沖器和穩(wěn)壓氣等。
壓力表要定期進(jìn)行檢修維護(hù)
.經(jīng)過一段時(shí)間的利用與受壓,壓力表機(jī)芯難免會(huì)浮現(xiàn)一些變形和磨損,壓力表就會(huì)產(chǎn)生各種誤差和故障。為了保證其原有的準(zhǔn)確度而不使量值傳遞失真,應(yīng)及時(shí)更換,以確保教唆正確、安全可靠。
.壓力表要定期進(jìn)行清洗。因?yàn)閴毫Ρ韮?nèi)部不清潔,就會(huì)增加各機(jī)件磨損,從而影響其正常工作,嚴(yán)重的會(huì)使壓力表失靈、報(bào)廢。
.在測(cè)壓部位安裝的壓力表,根據(jù) JJG- 規(guī)定,它的檢定周期一般不超過半年。
.測(cè)壓部位介質(zhì)波動(dòng)大,利用頻繁,準(zhǔn)確度懇求較高,以及對(duì)安全因素懇求較嚴(yán)的,可按具體情況將檢定周期適當(dāng)縮短。

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