Details For A Better Spindle Selection - Selecta STS-2011 L Manual De Instrucciones

MANUAL DE INSTRUCCIONES CODIGO 80253 REV 0
SP: L1 RPM:100.0
V: 2012.4 cP
63.1
J
.P. SELECTA s.a.

7.6 Details for a better spindle selection

There are more criterions to follow to select the appropriate combination spindle /
speed, besides the explained in chapter 7.2.
There are two initial criterions:
Measure it with the slightest measurement error possible.
Measure comparable to other measures.
7.6.1 Measure it with the slightest measurement error
possible
We have to find a suitable combination spindle/speed that meets the following
requirements (in order of importance):
1. The average value (shown in the display) would be as close as possible to the Full
Scale. That is, that the percentage will be the highest possible.
2. The speed would be the highest possible.
For example:
- Working with an «L» model equipment, and applying table: see annex.
- We want to measure a sample of about 5.000cP.
- From table «R Model» we could use one of the following combinations:
In this case, we will use the following combination:
As it is the higher speed (rpm) and the higher EoS percentage.
7.6.2 Measurements comparable to other equipments
%
In many occasions (for instance in control quality), measurements made must be
compared to the ones made in other laboratories.
When indicating a measurement result, we must indicate all the conditions such as:
viscosity, temperature and spindle number.
In practice, most of the liquids are «Non-Newtonian». Only some silicone oils are
«Newtonian». That's why you have to enter the spindle number and the speed used.
Ctra. NII Km 585.1 Abrera 08630 (Barcelona) España
e-mail: selecta@jpselecta.es - website: http://www.jpselecta.es
Febrero/2011 (Sujetas a modificaciones sin previo aviso)
- Spindle R1; speed 1 rpm
- Spindle R2; speed 4 rpm
- Spindle R2; speed 6 rpm
- Spindle R5; speed 60 rpm
and others.
Spindle R5; speed 60 rpm
Pag.: 19
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