Test Measurement, AutoMet

The top models HG63 and HR83 offer the test measurement and AutoMet (HR83 only) functions. These auxiliary functions help you find a suitable switchoff criterion.

Test Measurement

Select a temperature and sample volume for drying and run a test measurement. The report printed shows when each switch-off criterion was reached and the measurement result at that time. If you take this test measurement at different temperatures, you can establish a suitable switch-off criterion for a particular temperature at which you reach the reference value.
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In this instance test measurements were taken with fine flour at 4 different temperatures and the results of the switch-off criteria compared against the drying temperature. The aim is to reach the reference value from the determination with the oven at 103°C. You can clearly see that selecting 90°C would be too low a temperature and 150° too high a temperature. The points at which the five curves intersect with the reference lines show possible settings for the temperature and switch-off criterion combination. Possible settings are e.g. 110°C with switch-off criterion 3 or 130°C with switch-off criterion 2. Switch-off criteria 3 and 4 usually produce results which are easy to repeat. Switch-off criterion 2 should only be used if the time factor is more important than repeatability.
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AutoMet test measurement (HR83 only)

AutoMet_.jpgThe AutoMet test measurement is a further development of the test measurement. With this function you can use the "Target" button to enter the reference value and the instrument automatically establishes an appropriate switch-off criterion for the temperature selected. This will be the point at which the measurement most accurately matches the reference value. This is the free switch-off criterion "F". The AutoMet test measurement only proposes the switch-off criterion "F" if the drying trend means you can expect a precise moisture determination. The range for the F switch-off criterion is therefore limited to between 1mg/20 seconds and 1mg/180 seconds.

Tip: As drying trends can differ slightly even at the same temperature (distribution of samples, sample weight), repeat the AutoMet test measurement for a method development. The mean value calculated from these processes can then be saved as method-specific switch-off criterion F.

Note: If the target value is reached but the switch-off criterion is still outside 1mg/20-180 seconds, you have not selected the optimum temperature. If "F" is below 1mg/20 seconds, reduce the temperature. If "F" is above 1mg/180 seconds, either switch-off criterion 5 will provide a good approximation or it might be a good idea to increase the drying temperature. If the target value is not reached, increasing the drying temperature may obtain the desired result.