•
Common
: Mode can be changed to Celsius, Osmol, Hortvet or alcohol mode. The
base value for added water in Celsius mode, the user and the id can be changed.
•
Temperature
: The temperature of the cooling bath and the beat temperature can be
changed.
•
Calibration
: The used solutions for A- and B-calibration can be changed. And with
Pre-Calibration
a Pre-calibration can be started.
•
Plateau
: Plateau Search, Fixed time and Maximum are available. The parameters
can be changed depending on the selected plateau mode, see 12.1
•
Stirrer
: The stirring and beat amplitude and the stirring frequency can be changed.
To test the different settings, two different fields are available. By
Stirrer On
the
agitator starts moving. The agitator should be set to approx. 2 mm movement width
by changing
stir amplitude
. If the agitator is considered from the side, the
oscillation distance can be seen well. The agitator movement should be checked
regularly and readjusted if needed.
The agitator frequency should not be
changed. It has already been adjusted at the factory.
In the case that the
frequency has to be adjusted, it should be set to 4 Hz higher than the resonance
frequency. The resonance frequency is determined, e.g. by starting at 150 Hz and
constantly increasing the frequency afterwards. The resonance frequency is at the
point where the agitator movement achieves a maximum. By
beat- amplitude
the
amplitude when beating can be changed and with
beat
the amplitude can be
checked. For this purpose, hold a sample vial filled with 2.5 ml of water on the
measuring head so that agitator and thermistor dip in the water and activate the
agitator by touching
beat
. On the one hand, the agitator should strongly strike the
glass wall of the sample vial so that the freezing process is well and quickly
triggered: on the other hand it should not be too strong in order to prevent
damaging the sample vial.
12
