FAQ

What process connections are available for ViscoScope sensors?
The sensor can be manufactured with any standard or customised flange. Normal flange sizes are between DN50 / 2" and DN250 / 10". However, specially manufactured versions with different dimensions as well as antiseptic fittings for installation with absolutely no dead volume are also available. Tell us about the flange you require - so far we have never failed to realise a process connection.

What advantages do ViscoScope viscometers using the principle of oscillating torsion have over other vibrational viscometers?
The principle of oscillating torsion allows the sensor to produce accurate measurements independently of the direction and type of flow. The flow may be turbulent or laminar or pass the sensor sideways or axially. It makes no difference. This has been proved through experiments using oils which are independent of shear rate. Moreover, the viscometer is not affected by gas bubbles in the medium. With oscillating torsion, a shear wave is generated that penetrates the medium only to a very shallow depth, i.e. if a gas bubble touches the probe, only the liquid film of the gas bubble is measured. The shear wave does not penetrate the bubble itself.

Is it important to install the sensor in a specific position?
No, you can install the sensor in any orientation in a reactor, tank or pipe. However, it should be installed in a location that "makes sense" so that the measurement can be used to provide optimum regulation and control of the process. Do not hesitate to contact us. We will be delighted to offer you the benefit of our extensive experience.

Do vibrations caused by other equipment affect measurements?
Vibrations are produced by agitators or pumps but are dampened by the mass in a tank or pipe. The design of the sensor and use of an electronic filter eliminate these influences and guarantee that measurements are reproducible.

Does the system require maintenance?
The low amplitude at the system's resonance frequency means that the sensor is not subject to material fatigue or alteration. As the probe is completely welded, there are no moving parts and no bearings or seals on the sensor. There are many applications in which our systems have been running continuously round-the-clock for more than 10 years. No calibration inspection of the viscometer is required. However, QM guidelines often demand an annual calibration check. Please contact us if you wish us to inspect your system.

Can ViscoScope viscometers be used with any liquid?
In all liquids from low viscosity emulsions to high viscosity polymer melts. Measurements remain reproducible with both Newtonian and non-Newtonian fluids.

At what temperatures and pressures can the sensor be used?
The VA-300 sensor can be used at process temperatures of up to 450C (840F), special designs up to as high as 1500C (2730F). The process pressure is limited by the flange.