engleski

CHARACTERIZATION OF LPM'S 1-T DEW POINT GENERATOR

This paper describes characterization of 1-T dew point generator developed at Laboratory for Process Measurement (LPM) self-. Present operating range of generator is from -7°C to 18°C dew point range. The air flows through saturator in closed loop and is controlled with regulated flow meters. Air saturation degree is determined by measuring the temperature deviations between saturator air outlet and liquid in saturator. Thermometers are connected to the resistance bridge, which is in turn connected to the computer for data acquisition. The main design features of the 1-T generator are presented. The deviations between generated dew point temperature and LPM’ s dew point transfer standard hygrometer (recently calibrated in PTB) are discussed. The deviations between saturator air outlet and liquid in saturator are also examined. The test results are presented in graphical and tabular form together with an example of uncertainty estimates for various test dew points.

characterization; temperature deviations; measurement uncertainty

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