Connection Of Vz 7215 Absorption Traps; Connection Of The Vz 8552 Overflow Guard - Xylem SI Analytics ViscoPump II Mode D'emploi

ViscoPump II

2.4.3 Connection of VZ 7215 absorption traps

In the "sucking" mode (vacuum), volatile components can enter the ViscoPump II module.
This is particularly problematic for corrosive solvents such as formic acid or dichloroacetic acid.
Notice
For these cases, a hose fitting "suctioning" VZ 8524 must be used, which 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.
Notice
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 de-
colouration; 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.

2.4.4 Connection of the VZ 8552 overflow guard

We urgently recommend the connection of the VZ 8552 overflow guard (available as an option)
for the suction-mode operation of the ViscoPump II 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 II module). The holder on the safety bottle accommodates the
capacitive sensor.
When using the ViscoPump II module VZ 8511 (meniscus sensing by light barriers) the holder for the
safety bottle is to be attached to the measurement stand, e.g. the AVS®/S.
When using the ViscoPump II module VZ 8512 (thermo-resistive measurement) the holder for the
safety bottle is to be attached to the "viscometer gallows" provided for the TC viscometer 5732.
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 II.
Note
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).
Warning
Make sure that the Basic Measuring Unit is always the first device you switch off!
Prior to replacing any functional unit, please be sure to the mains plug MUST be pulled out of the
mains socket.
Caution: Liquid dripping off may be hazardous to the user!
Initial operation
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