Instructions For Measurement; Sample Preparation; Select The Correct Full Scale - Selecta ST-2020-L Manual De Instrucciones

INSTRUCTION MANUAL CODE 80239 REV C
Fig 7.1 Adjust the viscosimeter height
till the liquid level arrives to the spindle
mark.
Indication % Full Scale
20.0 C 60.0RPM
º
8888888.8
Fig 7.2 Percentage Full Scale.
J
.P. SELECTA s.a.u.
Sep2016

7. Instructions for measurement

To correctly measure the viscosity, you must use the suitable material, control the
ambient temperature and select the correct measurement scale.

7.1 Sample preparation

The liquid must be placed in a 600ml «Low-form» beaker.
You need 500ml of sample.
Place the beaker under the viscosimeter and move the main unit down till the spindle
mark arrives to the liquid level. See Fig. 7.1

7.2 Select the correct Full Scale

Any combination spindle / speed (rpm) establishes a viscosimeter measurement range.
Spindle effect on Full Scale:
Big spindles, number 1 & 2, are used to measure low viscosity values.
Small spindles, number 3 & 4, are used to measure high viscosity values.
Speed effect (rpm) on Full Scale (FS):
High speed is used to measure low viscosity values.
Low speed is used to measure high viscosity values.
Bearing in mind these effects, any combination speed / spindle has a different Full
Scale (FS).
When selecting a speed and a spindle, the display shows the Full Scale.
For instance: (See table 7.2.1)
Combination: spindle = no. 1; 60 rpm has a FS = 100cP
and combination: spindle = no. 1; 6 rpm has a FS = 1000cP
If the sample viscosity value is absolutely unknown:
- Put spindle no. 2
- Begin with a speed of 10 rpm.
- If the display indicates EEEEEEE, it means that the sample has a higher viscosity
than the FS. Change then to a smaller spindle. (No. 3 or no. 4)
- Check the value on the display upper right corner. (See figure 7.2) This value
indicated the measurement viscosity percentage on the Full Scale that corresponds
45.7
to the combination spindle/rpm.
%
SP 4
- This percentage should be as closest as possible to 100%.
P .
m a s
- Modify speed or the spindle as appropriate.
See chapter 7.3 concerning other details for spindle and speed selection.
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