| 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 t he water bath at a constant temperature in order to fulfill the prerequisites for calibration . In contrast, in the inventive method a measurement is determined for the maximum permissible dri ft (.alpha.max) in the temperature of the water bath ('B) which is measured as the equivalent of th e sample temperature ('P). This greatly simplifies the problem of adjusting the temperature which primarily arises as a result of the delays in the control circuit. The adjusting element need only recognize a drift (.alpha.) and correct the sum of the thermal currents whic h have occurred, to zero, allowing for a residual error (P restmax) which results from a permissible contouring error ('B, 'P). The release of heat from the 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, for example, in oceanography and inthis particular field, in polar research.
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