ViscoScope Viscosimeter FAQ
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.
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.
In all liquids from low viscosity emulsions to high viscosity polymer melts. Measurements remain reproducible with both Newtonian and non-Newtonian fluids.
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.
The VA-300 sensor can be used at process temperatures of up to 450°C (840°F), special designs up to as high as 1500°C (2730°F). The process pressure is limited by the flange.
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.
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.
Below you can see the installation positions for the ViscoSope VA-300. Please note the following: Compared to the VA-100, the VA-300 can be equipped with an NaV (non-active extension).
Below you can see the installation positions for the ViscoSope VA-100.
The idea is as simple as it is ingenious: The transmitter drives the sensor probe to an oscillating torsion at its resonance frequency with a very small amplitude. When the probe is immersed in a liquid, it “rubs” against the adjacent fluid layer. This creates a damping effect due to its viscosity. And now comes the difference to comparable systems: using a fast PID controller, the transmitter compensates for the amplitude loss caused by this damping effect, i.e. it keeps the amplitude constant despite the changing viscosity. This changes the driving voltage, which is the basis of the viscosity value. Using this technique, the ViscoScope® viscometer measures the dynamic viscosity x density in mPa·s x g/cm³ (η x ρ), responds to changes in viscosity in less than 2 seconds and enables the detection of the smallest differences – even under challenging process conditions. Because it is driven at a low amplitude at its resonant frequency, the probe is not subject to material fatigue. You will not find any moving parts, joints or seals in our probe because all parts that come into contact with the process are welded. The result: an extremely durable, reliable and maintenance-free process viscometer.
A factory multi-point calibration with certified Newtonian calibration oils is key to achieving reproducible results – regardless of whether the fluid being measured is Newtonian or non-Newtonian. Almost all liquids are non-Newtonian and thus dependent on shear rate, i.e. their viscosity changes when under force. Production processes create much higher shear rates than laboratory measurements. To be able to compare the process viscosity with the laboratory viscosity, it is essential to determine an empirical correlation. And don’t forget: calibration allows the measurement to be repeated, e.g. after a sensor has been repaired, when multiple systems are used in the same applications or after installation in a different system. In other words: 5.000 mPa.s remain 5.000 mPa.s
TÜV Rheinland hereby certifies that Marimex® has implemented and effectively applies quality management in accordance with the standard DIN EN ISO 9001:2015.
The certifying body for QA systems according to the Ex Protection Directive of TÜV Rheinland Industrie Service GmbH notified under No. 0035, certifies:
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