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當(dāng)前位置:> 供求商機> G36-10-01-原裝壓力表庫存現(xiàn)貨
原裝壓力表庫存現(xiàn)貨
壓力表的選用應(yīng)根據(jù)使用工藝生產(chǎn)要求,,針對具體情況做具體分析,。在滿足工藝要求的前提下,應(yīng)本著節(jié)約的原則全面綜合地考慮,,一般應(yīng)考慮以下幾個方面的問題:
1,、類型的選用
儀表類型的選用必須滿足工藝生產(chǎn)的要求,。例如是否需要遠(yuǎn)傳,、
壓力表(圖2)
壓力表(圖2)
自動記錄或報警;被測介質(zhì)的性質(zhì)(如被測介質(zhì)的溫度高低,、粘度大小,、腐蝕性,、臟污程度,、是否易燃易爆等)是否對儀表提出特殊要求,現(xiàn)場環(huán)境條件(如濕度,、溫度、磁場強度,、振動等)對儀表類型的要求等,。因此根據(jù)工藝要求正確地選用儀表類型是保證儀表正常工作及安全生產(chǎn)的重要前提,。
例如普通壓力表的彈簧管多采用銅合金(高壓的采用合金鋼),而氨用壓力表彈簧管的材料卻都采用碳鋼(或者不銹鋼),,不允許采用銅合金,。因為氨與銅產(chǎn)生化學(xué)反應(yīng),會爆炸,,所以普通壓力表不能用于氨壓力測量。
氧氣壓力表與普通壓力表在結(jié)構(gòu)和材質(zhì)方面可以*一樣,,只是氧用壓力表必須禁油,。因為油進(jìn)人氧氣系統(tǒng)易引起爆炸。所用氧氣壓力表在校驗時,,不能像普通壓力表那樣采用油作為工作介質(zhì),并且氧氣壓力表在存放中要嚴(yán)格避免接觸油污,。如果必須采用現(xiàn)有的帶油污的壓力表測量氧氣壓力時,,使用前必須用反復(fù)清洗,認(rèn)真檢查直到無油污時為止,。
2,、測量范圍的確定
為了保證彈性元件能在彈性變形的安全范圍內(nèi)可靠地工作,,在選擇壓力表量
壓力表(圖3)
壓力表(圖3)
程時,必須根據(jù)被測壓力的大小和壓力變化的快慢,,留有足夠的余地,,因此,壓力表的上限值應(yīng)該高于工藝生產(chǎn)中可能的zui大壓力值,。根據(jù)“化工自控設(shè)計技術(shù)規(guī)定”,在測量穩(wěn)定壓力時,,zui大工作壓力不應(yīng)超過測量上限值的2/3,;測量脈動壓力時,zui大工作壓力不應(yīng)超過測量上限值的1/2,;測量高壓時,,zui大工作壓力不應(yīng)超過測量上限值的3/5,。一般被測壓力的zui小值應(yīng)不低于儀表測量上限值的1/3。從而保證儀表的輸出量與輸人量之間的線性關(guān)系
根據(jù)被測參數(shù)的zui大值和zui小值計算出儀表的上,、下限后,、不能以此數(shù)值直接作為儀表的測量范圍。我們在選用儀表的標(biāo)尺上限值時,,應(yīng)在國家規(guī)定的標(biāo)準(zhǔn)系列中選取。中國的壓力表測量范圍標(biāo)準(zhǔn)系列有:-0.1-0.06,0.15;0-1,1.6,2.5,4,6,10X10" MPa(其中n為自然整數(shù).可為正,、負(fù)值),。
原裝壓力表庫存現(xiàn)貨
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G46-P4-01-X30
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G46-S10-02M-C
G46-S4-02M-C
原裝壓力表庫存現(xiàn)貨
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