Transparent Thermostats; Flow Coolers; Viscopump Ii Module; System Enhancements - Xylem SI Analytics AVS 370 Manual De Instrucciones

50

2.3.6 Transparent thermostats

Viscosity depends on the temperature of the sample liquid. This means that the viscometers must
always be thermostated during the measurement. The measurement temperature has to be kept
constant in order to achieve an accurate result.
The transparent thermostats from SI Analytics
viscometry, meet the requirements imposed on precision and constancy. The CT 72/2, CT 72/4
thermostats, for instance, guarantee a temperature constancy of ± 0,02 K at a command temperature
in the range of 10° to 40° C, and a maximum fluctuation of the ambient temperature of ± 3 K.
As a rule of thumb, you may suppose that the temperature deviation, expressed in degrees,
multiplied with a factor of 10 will correspond to the deviation from the result in terms of %. This means
that a deviation of 0.05 °C corresponds to a possible error of 0.5%.
In principle, two different transparent thermostats can be used on the AVS
for measurements at different temperatures, the CT 72/2, CT 72/4 transparent thermostats are
available. These thermostats can be equipped with two or four viscometers including other equipment.
For measurements up to 60 °C, the thermostat CT 72/ P of acrylic can be used.
The bath body of the thermostat CT72/P consists of acrylic (PMMA)!
Acrylic can be damaged by a variety of organic solvents as well as by concentrated acids/bases.
Therefore, a contact of the bath body with such substances should be avoided, as the acrylic may be
damaged.
Please read the separate operating manual of the transparent thermostats as well.

2.3.7 Flow coolers

As was mentioned above, viscosity measurement is highly dependent on temperature
constancy. For reasons of control technology (self heating of the thermostat head), it is therefore
necessary to use a CK300/CK310 flow cooler as a counter cooler at bath temperatures exceeding
40°C.
Please read the separate operating instructions of the transparent thermostats as well.

2.3.8 ViscoPump II module

The ViscoPump II modules control the entire measurement process, among other things the
temperature pre-adaptation process of the samples in the viscometers, the process of pumping the
liquid up into the storage containers of the viscometers, the measurement of the flow times etc. The
serial interface of the AVS
with the PC.
To replace the ViscoPump II module, please proceed as follows:

Remove the pneumatic and electrical connections from the front panel of the ViscoPump II
module to be replaced.

Loosen the screws located at the corners of the front panel.

Use the upper and lower insertion handles to leverage the ViscoPump II module out of its
rearside plug connection.

Pull the ViscoPump II module out of the AVS

After inserting the new ViscoPump II module, please secure it again with the screws of the
front panel. Re-establish the electrical and pneumatic connections.

2.3.9 System enhancements

A number of functional units of the AVS
can be replaced or added.
Make sure that the AVS
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!
®
370 Viscosity Measuring Unit ensures a speedy and simple data transfer
®
370, such as the viscometers and the ViscoPump II modules,
®
370 is always the first device you switch off!
®
which were developed especially for capillary
®
370.
®
370: