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首页> 外文会议>2004 AGA operating section proceedings >A TRACEABLE CALIBRATION PROCEDURE FORHYDROCARBON DEW POINT METERS
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A TRACEABLE CALIBRATION PROCEDURE FORHYDROCARBON DEW POINT METERS

机译：烃露点米的可追溯校准程序

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Gasunie Engineering and Technology (formerly Gasunie Research) has carried out arnnumber of tests for several gases with the new Condumax II Hydrocarbon Dew PointrnAnalyser manufactured by Michell Instruments Ltd. The results were compared with liquidrndrop-out measurements carried out according to ISO 6570.rnThe measurements have shown that the Condumax II is able to determine dew pointsrnwith a reproducibility of ± 0.1 °C. The measured dew points correspond withrnapproximately 10 – 40 mg/m3(n) liquid drop out at the same pressure and the measuredrndew point temperature.rnFrom measurements over a period of more than one year at six different locations it canrnbe concluded that European sales gases show large and rapid variations in dew point,rnwhich justifies the continuous monitoring of this important gas quality parameter.rnIn this paper, it will be shown that a direct relationship exists between hydrocarbon dewrnpoint and liquid drop-out content measured according to ISO 6570. This means that it isrnnow for the first time possible to calibrate a hydrocarbon dew point analyser against thernISO 6570 standard. The measured dew points will therefore correspond to a fixed potentialrnhydrocarbon liquid content at the same pressure, this way the measured hydrocarbon dewrnpoint is made traceable towards primary standards.rnLiquid drop-out curves vary for different gases, therefore the difference between thernmeasured dew point and the “dew point” corresponding with 5 mg/m3(n) liquid drop-outrncan vary between 0 – 5 °C. By adjusting the threshold value of the dew point meter thisrndifference can be reduced to 0.5 °C or less.rnFor gases with steep liquid drop-out curves and measured dew points close to thernmaximum contractual value a periodic check against liquid drop-out measurements shouldrnbe made, because a deviation of only a few tenths of a degree Celcius in dew point canrnalready result in tens of mg/m3(n) liquid drop-out.rnThe results of this work can be considered as the first step in the process towards arnharmonized measuring method for the hydrocarbon dew point and thus to improvedrninteroperability at cross border points.
机译：Gasunie工程技术公司（以前称为Gasunie Research）已使用Michell Instruments Ltd.生产的新型Condumax II烃露点分析仪对多种气体进行了相当数量的测试。将结果与根据ISO 6570进行的液体滴落测量进行了比较。rn表明Condumax II能够以±0.1°C的再现性确定露点。在相同的压力和露点温度下，测得的露点对应着大约10 – 40 mg / m3（n）的液体滴落。从一年中在六个不同位置进行的超过一年的测量，可以得出结论，欧洲销售气体表明露点的变化很大而又迅速，这证明了对该重要气体质量参数的连续监测是有道理的。rn本文表明，根据ISO 6570测得的烃露点与液体滴落含量之间存在直接关系。这意味着这是首次有可能根据ISO 6570标准校准烃露点分析仪。因此，在相同压力下，测得的露点将对应于固定的潜在液态烃含量，因此可将测得的烃露点追溯到一级标准。rnrn液体的滴落曲线随不同气体而变化，因此测得的露点与气体之间的差值对应于5 mg / m3（n）液体滴落的“露点”可以在0 – 5°C之间变化。通过调节露点仪的阈值，可以将差值降低到0.5°C或更小。对于具有陡峭液体滴落曲线且测得的露点接近最大合约值的气体，应定期检查液体滴落测量值，因为露点温度只有十分之一摄氏度的偏差就已经导致数十mg / m3（n）的液体滴落。rn这项工作的结果可以被认为是实现自动化测量的第一步烃露点的方法，从而改善跨界点的互操作性。

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