Knauer K-7400, Руководство пользователя

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Using the Osmometer K-7400 15
new value will be abandoned and the CALIBRATE menu will be
shown again.
5. Wait for the warming up to the stand-by temperature.
6. Prepare the instrument according SOP 1 for a measurement of a
400 mOsm/kg calibration solution (KNAUER Order No. Y1241).
7. Activate the second calibration field and select “0400” and repeat
steps 3 to 5.
If for special applications as some times in the pharmaceutical industry a
3 point calibration is required proceed according
SOP 3 and repeat the
procedure for calibration field 3.
A new calibration is also necessary after
1. exchanging the measurement head
2. changing the settings of FREEZING potentiometer
Measuring Samples
SOP 4 Performing a Sample Measurement
1. Prepare the instrument according SOP 1 for a measurement of a
sample solution.
2. Press the START key to start the measurement run. While running
the screen displays the sample temperature and the elapsed time.
RUN > -1.23°C<
01:23
At any time the run can be interrupted pressing the STOP key.
3. The instrument detects the freezing point depression and if the
crystallisation occurred properly displays the corresponding
osmolality. On the main screen.
>>> 1234 mOsmol <<<
♦ <next sample>
4. The printer output is given in the format
Measured 1234 mOsmol/kg
19.03.15 16:05:35
If no crystallisation (temperature increase) takes place after the
automatically start of the vibrator the measurement will be stopped
with the error message
> ERROR <
NO FREEZE
If the crystallisation (temperature increase) takes place before the
start of the vibrator the measurement also will be stopped with an
error message