Knauer K-7400S, Instructions Manual

Page: 21 / 50

Semi-Micro Osmometer K-7400S instructions, V3700
Operation 19
Screen Explanation
1 Main menu
2 Data Output Controls the connection of the Osmometer with
a printer or PC.
3 TEMP Displays the current temperatures of the sample
and the cooling cavity. Additionally, units can be
changed from [° C] to [°F] with the
ÙÚ
buttons.
If the sample temperature is displayed with
„----“, the measuring head is not connected.
4 INFO Shows the serial number and the current firm-
ware version.
5 DATE Setting for the date and time. The setting
remains saved when switching off the device.
6 CALIBRATE Displays the calibration points which are cur-
rently in use. There are 3 possible calibration
points. The first field is fixed at „0000“. At least
2 calibration points are necessary for regular
mea surements. From this screen, the calibrat-
ions will be started (see „Performing the cali-
bration“ on page 22).
7 COOL Sets following parameters, in 0.5 ° C steps:
Initiation point „freeze“ within the range from
– 13.0 to – 4.0 ° C.
Minimum temperature „cooling limit“ within the
range from – 18.0 to – 12.0 ° C.
8 CALIBRATE-T Enables the pre-calibration to adapt the osmom-
eter to the measuring head, see „7.7.1 Pre-cali-
bration“ on page 21.
Note: Calibration and measurement must be performed at the same
set tings (freeze & cooling limit). Additionally, an identical sample volume
must be used for measuring and calibration to ensure exact and repro-
ducible data. As a result, every change of the temperature settings or the
sample volume demands a new calibration.