溫壓補償能避免出現新的誤差?
溫壓補償能避免出現新的誤差?
(本文由專(zhuān)業(yè)銷(xiāo)售記錄儀記錄紙記錄筆的綠圖控儀器儀表有限公司提供)
溫壓補償能避免出現新的誤差?
采用溫壓補償時(shí)都要用到壓力變送器,這時(shí)應考慮:大氣壓及液柱壓力的影響,以免出現新的誤差,分述如下:溫壓補償能避免出現新的誤差?大氣壓力引起的誤差,由于溫壓補償的經(jīng)驗公式中,都包含有蒸汽**壓力這一參數,而一般做法是用壓力變送器,把檢測出來(lái)的蒸汽表壓力加上當地大氣壓來(lái)表示**壓力,因此在建立數學(xué)模型時(shí),應根據當地的大氣壓來(lái)計算,不能不加區別采用近似等于0.1Mpa來(lái)代替大氣壓,尤其是海拔較高的地區及所測蒸汽壓力較低時(shí),更應引起注意。如果選用**壓力變送器則不會(huì )產(chǎn)生上述影響。溫壓補償能避免出現新的誤差?
液柱靜壓力引起的誤差,由于各種壓力變送器的取壓口與變送器本體大多不可能處于同一高度,因此冷凝水的靜壓力對變送器的輸出會(huì )造成影響,而產(chǎn)生附加誤差。取壓口與變送器的垂直距離越大則影響越大,這一影響對普通壓力變送器,**壓力變送器都存在影響。這時(shí)采取零點(diǎn)遷移和加修正值的方法來(lái)調整壓力變送器,以消除影響。 溫壓補償能避免出現新的誤差?
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