Torque Calibration - Heidolph Hei-TORQUE Expert Betriebsanleitung

Operation

Torque calibration

The devices are factory-calibrated, but this cannot reflect your individual ambient
operating conditions. If you need the torque to be displayed as accurately as possible,
please calibrate the torque under your operating conditions.
There are 2 ways of calibrating the torque:
Setting relative zero: Relative zero is measured within the sample, i.e. zero torque is
defined by the resistance of your sample.
Setting absolute zero: Absolute zero is measured outside the sample, i.e. zero torque is
defined irrespective of sample resistance.
Do not calibrate the torque until the stirrer has warmed up by
running it for approx. 15 - 30 min. Within the first few minutes of
operation, when the device is cold, the temperature-dependent
resistance of the gear system distorts the torque.
➜ Stirring has been running for 15 -
30 minutes in the sample.
➜
Press "Cal" in the main menu.
➜ The message "Torque calibrated"
is displayed.
➜
"MEM" flashes on the display until
calibration is reset to the factory
setting.
➜
If relative zero is selected, the
display shows positive or negative
torque, depending on any
change in sample viscosity since
calibration.
➜ If absolute zero is selected, the
display shows the absolute torque
depending on the resistance of the
sample. In general, the torque will
be positive.
Calibration is only valid for the speed set while calibration was
performed. As soon as the speed is changed, the torque changes
and re-calibration might be required.
Therefore calibration is not valid for a profile with differing speeds
selected via favorites.
Reset to factory calibration values
➜ Stop rotation.
➜ Press "Cal" in the main menu.
– Calibration is reset to the factory setting.
As soon as the device is switched OFF, calibration will automatically
be reset to the factory setting.
Torque Torque
90
MEM MEM