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Chemical and biological safety
1.4.2
The device is not intended for use with potentially biohazardous substances.
The relevant regulations regarding the handling of the substances used have to be observed:
The Decree on Hazardous Matters, the Chemicals Act, and the rules and information of the chemicals
trade. On the part of the user it has to be ensured that the persons entrusted with the use of the unit are
experts in the handling of substances used in the devices or that they are supervised by specialized
persons, respectively.
When using biohazardous substances, the regulations for handling the substances used must be
observed. In such cases, the use is the sole responsibility of the user.
For all work with chemicals: Always wear protective glasses! Please observe the memorandums of
the employer's liability insurance associations and the safety data sheets of the manufacturers.
Dispose of all used solutions in accordance with national regulations and laws. Select the type of
protective equipment according to the concentration and quantity of the hazardous substance at the
respective workplace.
Flammable liquids
1.4.3
When handling flammable liquids, make sure that there is no naked flame in the vicinity of the equipment.
Adequate ventilation must be provided. Only small quantities of flammable liquids should be kept in the
workplace.
1.5
Functioning of the device
The ViscoPump III Module is used to perform flow-time measurements in capillary viscometers.
The available capillary viscometers enable viscosity measurements 0.35 of approx. 5,000 mm
be carried out at a measuring temperature of approx. 20 ... 25 °C.
The ViscoPump III Module can be fitted out in two ways to be used for meniscus sensing. Connecting TC
viscometers to the ViscoPump III VZ 8562 module will also enable the measurement of black and opaque
liquids. As an alternative option it is possible to use viscometers in combination with the optoelectronic
ViscoPump III VZ 8561 module viscometers for meniscus sensing with the measurement stand, e.g. the
®
AVS
/S.
Time recording extends up to 9999.99 seconds with a resolution of 0.01 s. Serial data transmission is
used to transfer the time readings to the respective controller unit.
Prior to the measurement as such, the liquid to be measured is sucked upwards inside the capillary
viscometer though two measurement planes (N2 and N1) which are designed as light barriers or
thermistor sensors, depending on the viscometer type (see Fig.1 and Fig. 2).
When using Ubbelohde viscometer, the design of the program ensures that the suspended spherical level
will form prior to the start of the measurement.
1.6
Capillary viscometry
Capillary viscometry is the most accurate method for the determination of the viscosity of liquids with a
Newtonian flowing behaviour. The measurement as such consists in a time measurement. The time
measured is that which a specific quantity of liquid requires to pass through a capillary having a defined
width and length. Conventionally, this process is watched with the human eye, and the flow time is
measured manually using a stop watch.
In the case of the AVS
®
SI Analytics
, the liquid meniscus is captured on the measurement planes, either in an optoelectronic
manner by means of light barriers, or else on a thermo-resistivity basis by thermistors.
®
370 Viscosity Measuring Unit, as with all viscometry measuring devices from
/s (cSt) to
2
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