General Information; Selection Of Menu Items; Selection Of The Operating Mode; Viscopump Parameters - Fisher AVS 470 Manual De Instrucciones

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5.4

General information

5.4.1

Selection of menu items

After selecting the required menu item using the selection bar = cursor in combination with the ↓ and ↑ arrow
keys, the item will be highlighted in black. Pressing the "Enter" key will confirm your selection.
Input of values: Any values to be input are to be entered in the corresponding empty or default-value fields.
After selecting the corresponding fields using the selection bar = cursor in combination with the ↓ and ↑
arrow keys, the respective field will be highlighted in black. If the upper or lower limits are ignored in the
selection, you cannot proceed by simply pressing the "Enter". The default value will be displayed.
Please note: If a numeric field (other than a floating-point field) allows the input of e.g. 3 digits, but only 1 or
2 of the digits to be input are of significance, a trailing "0" has to be added.
Example: The value 100 is to be changed to 30; the input would be 0 - 3 - 0; on the display the value will be
shown as 030.
Storing the values or selection: The values entered or changed, or the selection made, respectively, are
taken over and memorized only after an explicit confirmation. Return to previous screen: If you wish to return
to the preceding screen without saving any changes, please press the "Esc" key.
5.4.2

Selection of the operating mode:

(Chapter 5.6, fig. 23) A selection can be made between "sucking" and "pressing" action. After power-up, the
selected operating mode will be signalled in the form of the letter "P" or "S" on an indicator light (red LED) on
the front panel.
The user is responsible for using the appropriate hose sets and connecting them properly!
5.4.3

ViscoPump parameters:

In fig. 23, ViscoPump parameters, you may set the "Ramp", "Pump power", "Meas. delay" and "Suction
above N1" parameters in addition to the operating mode. Legend:
Ramp: This is the gradient angle applicable to the individual pump-pressure increases (dynamic pumping /
suction); the default setting is 15 scale sections (fictitious measure).
Pump power: The max. achievable performance, the default value = 30%!
Meas. delay: A factor which may be added as a holding period to the period of time which was calculated
from the flow time and which is to be observed between two subsequent measurements in order to shorten
this time out of a system-inherent necessity, or to increase it, for instance, to allow the capillary to run empty.
Suction above N1: A factor which may be used to shorten or increase the period of time which was calcu-
lated from the flow time as required for sucking/pumping above the upper N1 level, if this seems to be
appropriate out of a system-inherent or application-technological necessity.
The default values of these parameters are selected in such a manner that a large portion of all applications
can be carried out without any problem. In special cases, for instance in the case of very short run times in
micro viscometers, or in the case of very high toughness, or also for optimising the total throughput, these
parameters may require an adaptation.
Please note that such an adaptation has to be made only in small steps and with due care. Any
improper modification may cause damage to the ViscoPump II module of the AVS 470 and lead to the
loss of warranty.
Chapter 5 Working with the AVS 470 Viscosity Measuring Unit