| 摘要 |
Known methods use the temperature of the water bath which surrounds the liqu id sample, as the adjusting parameter. The aim in these methods is to maintain the water bath at a constant temperature, in order to fulfil the prerequisit es for calibration. In contrast, in the inventive method, a measurement is determined for the maximum permissible drift (.alpha.max) in the temperature of the water bath (.theta.B) which is measured as the equivalent of the samp le temperature (.theta.P). This greatly simplifies the problem of adjusting the temperature which primarily arises as a result of delays in the control circuit. The adjusting element need only recognise a drift (.alpha.) and correct the sum of the thermal currents which have occurred to zero, allowin g for a residual error (Prestmax) which results from a permissible contouring error (.DELTA..theta.max) between the water bath temperature and the sample temperature (.theta.B,.theta.P). The release of heat from a mixing propeller (Q) is used to obtain a rapid compensation. In addition, a number of improvements have been made to the construction of a device for carrying out the inventive method. Overall, said inventive method results in much more accurate measurement results. The method and device can be used in all field s, in which the determination of the salt content of liquids is of interest, fo r example, in oceanography and in this particular field, in polar research.</S DOAB>
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