Viscosity and density measuring in parallel

The new DVS 1 from Lauda measures the dynamic viscosity and density of liquids from the damping of a vibrating bubble in a test sample.

The high level of precision, the very gentle measuring technique (thanks to the small amplitudes), the small sample quantity of just a few millimetres, and very easy operation via a separate control panel make this device into a piece of all-round measuring equipment.

In conjunction with the Lauda RE 305 thermostats, the viscosities required for calculating the viscosity index at 40C and 100C and the change in density of the same very small sample quantity can be carried out in parallel.

The special feature about this is that they can even be carried out on used, dirty motor oils in a short time.

The sample is simply injected using a 2ml disposable syringe and can be removed following the measuring process and perhaps be re-used.

Rinsing is also via a disposable syringe using a suitable solvent.

The success of the cleaning can be assessed and optimised via the observation window or via the viscosity value of the rinsing agent.

By means of an integrated pump, the measuring cell can be dried.

It is also precise enough to make visible the loosening process of polymer solutions and to determine the viscosity values.

An advantage is the high level of the resistance to solvents achieved by the gold coating of the sensor, which enables the use of acetone or methylene chloride as solvent or rinsing agent, for example.

The device has great advantages where standard viscometry fails, or biological and medical samples only available in small quantities.

The external handy control panel with self-explanatory menu-driven operation is intuitively easy to use and does not require any prior knowledge.

The measured values of dynamic viscosity, density and temperature are also documented in dependency on the time, and shown on the large graphic display.