Semi-Micro Osmometer K-7400S instructions, V3700
Operation
21
2.
Put the filled sample tube on the thermistor, so that the thermistor
and the stirring wire dip in the solution. The meniscus of the liquid
must be aligned horizontally.
3.
Place the measuring head on top of the device, so that the sample
tube is inserted into the cooling cavity. The feet of the measuring
head do not have to rest on the device.
The device is now ready for measurement.
7.7
Calibration
7.7.1
Pre-calibration
A pre-calibration is necessary when:
the device is taken into operation the first time.
the measuring head has been replaced.
Prepare a measurement with water (HPLC quality).
1.
Select CALIBRATE-T in the osmometer menu (screen 8 in Fig. 8).
2.
Push the <START> button. While the pre-calibration is running, the
screen displays the sample temperature and the elapsed time. The
run can be interrupted at any time by pressing the <STOP> button.
thermistor > +9.99 ° C<
00:56
3.
After finishing the calibration, the screen displays the message
„CALIBRATE-T sample? >successful<“. To confirm the calibration press
the <START> button once. Afterwards the initial CALIBRATE-T menu is
displayed and previous calibration values are deleted.
Device defect
If the sample tube is removed from the measuring head while the
sample or the calibration solution is frozen, the thermistor or the stirring
wire can be damaged.
When the message „next sample“ appears on the display, the sample
tube is safe to remove.
Note:
Any performed pre-calibration deletes the existing calibration
val ues.
4.
If you get the message „not successful“ on the screen at the end of
the pre-calibration, the sample is not frozen. Make sure if
the sample is 0 mOsmol / kg
a valid measuring head is proper connected to the device.
5.
Repeat the pre-calibration if necessary.
Next Steps
Prerequisites
Process
