Idiomas disponibles
Idiomas disponibles
38
2.4.2
TC viscometers with thermistor sensors
Fill the viscometer, then place it in the thermostat bath. Connect the ViscoPump III module VZ 8562 and
the TC viscometer using the hose/cable combination which comes with the device. To do so, place the
device in the holders, then attach the quadruple plug of the cable to the viscometer and the ViscoPump III
module (first plug, then screw); subsequently, make the screwed connections in accordance with the
numbers indicated on the hoses and the rack. In the case of "pressing" operation, the capillary tube
remains open, for "sucking" operation the filling tube is to be left open. Please observe the color codes
(red = suction, black = venting) when connecting the pneumatic screwed connections to the ViscoPump
III module for TC viscometers.
2.4.3
Connection of VZ 7215 absorption traps
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, 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 color 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 color 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 decoloration;
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 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
When using the 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 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 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) is just close from responding (i.e. the LED is on).
®
/S.
