Semi-Micro Osmometer K-7400S instructions, V3700
Operation
23
value will be abandoned and the CALIBRATE menu will be shown
again.
4.
Prepare a measurement with a calibration solution (see „7.6.1 Measu-
rement preparation process“ on page 20). Enclosed to the osmo-
meter are fit ting solutions for calibrations with an osmolality of 400 or
850 mOsmol / kg.
5.
Activate the second calibration field on the CALIBRATE screen and
set the osmolality for the calibration solution.
6.
Repeat step 2 to 3.
For special applications, especially in the pharmaceutical industry, a
Three-Point Calibration is required. If this is the case, proceed according
to the process above and repeat the process for the calibration field 3.
Re-calibration
A re-calibration is necessary after
replacing the measuring head
changing the temperature settings (see fig. 8 screen 7)
changing the sample volume
7.8
Measuring sample solutions
7.8.1
Performing a sample measurement
Prepare a measurement with a sample solution (see „7.6 Preparing a mea-
1.
To perform measurements, choose screen 1 (Fig. 8) with the
ÙÚ
but tons and push the <START> button. While the measurement is
running, the screen displays the sample temperature and the elapsed
time.
RUN > -1.23 °
1:23
The run can be interrupted any time by pressing the <STOP> button.
2.
The device starts the crystallisation automatically and detects the
freez ing point depression. If the crystallisation occurred properly, it
displays the corresponding osmolality on the display:
>>> 1234 mOsmol <<<
<next sample>
The printer output is given in the following format:
Measured 1234 mOsmol
19.03.15 16:05:35
3.
Before the next measurement, wait for the sample to unfreeze. This is
shown by the message „next sample“ on the display.
If no crystallisation occurs after the automatical start of the stirring wire,
the measurement will be stopped with the following error message:
Prerequisites
Process
