15
Auto Zeroing:
For compensation mechanical friction and grease viscosity, you must auto-zero the device before you measure the viscosity:
Before auto-zeroing, empty the vessel according to the reminding of the
WiCo
firstly.
Set the maximum speed higher a little than the select speed in the following viscosity measuring.
For example: when you use R 1345 HV and the optimum speed (200 rpm) to measure a medium viscosity, the maximum speed should
be set as about 210 to 250 rpm.
The zeroing processing will take about 150 seconds.
Viscosity measuring:
In order to achieve optimum measurement result, the device should run idle (without stirrer tool) more than 30 minutes at the speed 2000
rpm. Then, perform auto zeroing as above instructions.
After auto zeroing, you can start to measure the medium viscosity as following:
)
Input the density for the test medium.
)
Select the stirrer tool as required.
)
Active the viscosity display.
)
Back to working screen and set speed for measuring.
)
Start to run the device.
Ö
Read the viscosity value when the figure get steady.
Note:
The formulas for calculating the viscosity have been put together for the respective viscosity range with the vessels listed and the
stirring elements appertaining thereto, based upon the physical laws and taking into account the smallest error square out of more than
20 measuring values (with Newtonian calibration oils at 22 ºC).
Measuring error calculating formula:
Example for viscosity measuring:
When you measure a medium in following status:
Kinematic viscosity range: 10000 mpa
·
s to 100000 mpa
·
s
Medium density: 0.980 g/
cm
3
Stirrer tool: R 1302
1. Warm up the device:
Remove the stirrer tool from the device and switch the device to range II (high speed range). Run the device with speed 2000 rpm
more than 30 minutes.
2. Perform auto Zeroing to the device:
Stop the device and enter the menu option "Auto Zeroing" under "Viscosity".
Press on "OK" in "Empty the vessel" screen.
Set the maximum speed (e.g.:210 rpm) to the auto zeroing. The maximum speed should be higher a little than the speed that will be
used for viscosity measuring in next step.
Press on "OK" to start the auto zeroing. This process will take about 150 seconds.
Menü
Viskosität
Viskosität
Dichte
R
ührer
Display
Automat. Nullabgleich
> Viskosität
Automat. Nullabgleich
Gefäß leeren!
g
OK
> Viskosität
Automat. Nullabgleich
OK
Max. Drehzahl:
50
rpm
> Viskosität
Automat. Nullabgleich
OK
Max. Drehzahl:
210
rpm
> Viskosität
Automat. Nullabgleich
Bitte warten...
> Viskosität
Automat. Nullabgleich
OK
Max. Drehzahl:
210
rpm
B - A
A
= X %
A – Standard oil viscosity
B – Measured viscosity
