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Model 491 Viscometer automated process stream analyser

The Hallikainen Model 491 Viscometer is a completely automated process stream analyser with a remote sealing as standard for higher viscosity applications.

Online Viscometer+Hallikainen 421/491

Highly responsive touchscreen for ease of operation The model 1077L Viscometer+ features an ultra responsive projective capacitive touchscreen which has a unique IECEx & ATEX Zone 1 IIC rating without the need for air purge.

Measuring the viscosity of a medium with the Steuma viscositymeter
ViscoTron process viscometers measure the viscosity of liquids continually and precisely in-line. ViscoTron sensors have virtually no moving parts and are maintenance free. Torsional oscillation viscometers are surface loading devices. These devices measure the viscosity at the interface between the liquid and the solid surface.
The sensor bulb twists back and forth at the sensors natural resonance. The drive shaft is welded to the sensor and moves the sensor, resulting in a micron size motion at the sensor surface. The
compliant sheath, which is also welded to the sensor and the opposing static plane, acts as a spring for the resonance. This completely welded construction hermetically seals the internal mechanism from the
process and provides high integrity of the sensor. The vibration on the sensor surface can barely be felt.

ViscoTron sensors utilize a constant amplitude torsional oscillation principle to measure the viscosity. The power required to achieve the constant amplitude is a measure for the viscosity. This technology allows for the large range ability of our ViscoTron systems.


Food and Beverage
Chemical and Petrochemical industry
Pharmaceutical industry
Other: acrylic fibers, textile fibers, Black liquor, condensed milk, darcon, lycra, galatine, PET, resins poly-isobutyls, printing ink,…