Xylem SI Analytics AVS 370 Manual De Instrucciones página 38

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Connection of VZ 7215 absorption traps
2.3.3
In the "sucking" mode (vacuum), volatile components can enter the ViscoPump III module.
This is particularly problematic for corrosive solvents such as formic acid or dichloroacetic acid.
For these cases, a hose fitting "suctioning" VZ 8524 must be used!
(includes the absorption traps VZ 7215 and appropriate connecting hoses).
The absorption traps which prevent contaminations from penetrating into the pneumatic system of
the ViscoPump have to be inspected at regular intervals. If sodium lime is used as an absorption
agent with acidic solvents, the colour condition of the indicator is to be checked on a daily basis. As
soon as this condition has shifted to BLUE in the half of the absorber material, this is the very last
moment to replace the material for safety reasons.
If such a colour shift cannot be observed over an extended period of time, this may be
attributable to the fact that an acidic over-saturation of the material has caused a
decolouration; this may then appear as "normal", but it will definitely result in the destruction
of the pneumatic system after some time! This situation is explicitly excluded from the warranty
coverage!
For non-corrosive solvents and oils, which contain volatile constituents, absorption traps with activated
carbon filling are available. When using activated carbon as an absorption agent (e.g. with solvents or
used mineral oils), a replacement should be made at intervals between 1 and 2 weeks; this depends
on the load factor which, in turn, is a function of the volatility of the materials.
Connection of the VZ 8552 overflow guard
2.3.4
We urgently recommend the connection of the VZ 8552 overflow guard (available as an option) for the
suction-mode operation of the ViscoPump III module. The connection of the VZ 8552 overflow guard
(capacitive sensor for the safety bottle) excludes over-pumping in suction mode (contamination of the
ViscoPump III module). The holder on the safety bottle accommodates the capacitive sensor.
When using the ViscoPump III module VZ 8561 (meniscus sensing by light barriers) the holder for the
safety bottle is to be attached to the measurement stand, e.g. the AVS
ViscoPump III module VZ 8562 (thermo-resistive measurement) the holder for the safety bottle is to
be attached to the "viscometer gallows" provided for the TC viscometer 5932.
Should any liquid be over-pumped into the safety bottle, the safety sensor will trigger a stop.
After emptying the safety bottle, the lateral LED on the capacitive sensor will go out. You may
continue with the measurements.
The electrical connection of the VZ 8552 overflow guard is made using DIN plugs on the front side of
the respective module of the ViscoPump III.
The sensitivity of the capacitive sensor has to be adapted to the medium being used.
To do so, please use the enclosed screw driver to adjust the lateral set screw in such a manner, that
the capacitive sensor in the built-in condition (i.e. without medium) are just close from responding
(i.e. the LED is on).
Connection of the overflow guard for the VZ 8551 waste bottle
2.3.5
We urgently recommend the connection of the VZ 8551 (weighing balance) overflow guard for the
waste bottle (available as an option) for rinsing and dry operation. The connection of the weighing
balance prevents the VZ 5379 waste bottle (2000 ml) from spilling over.
The sensitivity of the weighing balance has to be adapted to the medium being used!
To do so, please adjust the set screw in such a manner that the weighing balance triggers as soon as
the desired filling volume has been reached. After emptying the waste bottle, you may continue with
the measurements. When making the connection, please make sure that the VZ 8551 overflow guard
is correctly assigned to the ViscoPump III modules.
®
/S. When using the