Connecting The Viscometers And Other Devices; Tc Viscometers With Thermistor Sensors - Fisher AVS 470 Manual De Instrucciones

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2.3

Connecting the viscometers and other devices

The AVS 470 Viscosity Measuring Unit allows the use of most various viscometer types:
DIN, ASTM, Ubbelohde and Micro Ubbelohde viscometers as well as Cannon-Fenske Routine, Micro TC
and Micro Ostwald viscometers.
Owing to careful manufacture and quality-assurance procedures, all viscometers from Schott Instruments
meet the highest accuracy standards.
The K viscometer constant is determined individually by way of a calibration of each glass capillary vis-
cometer. Owing to the use of high-quality measurement and testing equipment and the application of na-
tional standard gauges, Schott Instruments guarantees an absolutely precisely reproducible calibration. For
Ubbelohde viscometers having the same constant, the same correction seconds (Hagenbach-Couette
correction) are valid.
Gauging by the user is not necessary, since the corrections correspond to the theoretical values as taken
from the operating instructions for the viscometers. This statement is true for both Ubbelohde viscometers of
normal size as well as for micro viscometers.
In addition, it is also possible to connect or control other devices, such as absorption traps, overflow guards
etc. Depending on the intended use of the AVS 470, it may be highly recommendable to connect these
devices, please refer to the items below.
The AVS 470 Viscosity Measuring Unit is not intended to be connected to any devices other than those
mentioned above, e.g. to computers, piston burettes, or similar Schott Instruments devices working
according to the daisy-chain principle. If you wish to use a computer, please select the AVS 370 Viscosity
Measuring Unit from Schott Instruments; in case of need, please contact Schott Instruments for the
corresponding documentation. At the time the present operating instructions went to press, the connection of
an external rinsing device was not yet possible.
2.3.1

TC viscometers with thermistor sensors

Fill the viscometer (approx. 18 - 20 ml), then place it in the thermostat bath.
Connect the AVS 470 Viscosity Measuring Unit 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 II 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 colour codes (red = suction, black = venting) when connecting the pneumatic screwed
connections to the ViscoPump II module for TC viscometers (VZ8612) of the AVS 470 Viscosity Measuring
Unit.
Chapter 2 initial operation