ViscoSite VL800 Viscometer
Operating Manual
ViscoSite VL800 Viscometer
Galvanic Applied Sciences, Inc.
Email: [email protected]
Phone: (978) 848--2701
Operating Manual Rev: 2.0E
Toll-Free: 1 (866) 252-8470
Page 16 of 132
1.2 Overview
The ViscoSite VL800 Viscometer comprises a transmitter and a VL800 transducer
and provides measurements from which process material viscosity may be
determined. The system is capable of measuring flowing and stationary
materials across a broad range of viscosities, temperatures, and densities.
Temperature compensation per ASTM D341 for liquid petroleum products is
available. With a known static or real-time density, the transmitter can display
the measured viscosity in several standard viscosity units. In the absence of
density information, the product of viscosity and density is displayed.
1.3 Principle of Operation
The ViscoSite VL800 Viscometer operates on the principle of torsional forced
oscillation resonance. The ViscoSite transducer is depicted in Figure 1.1.
Figure 1.1: Anatomy of the ViscoSite VL800 Viscometer
The sensor tip is driven in sinusoidal rotational oscillation. Small amplitude
oscillatory shear waves propagate through the material and are dampened.
Dampening effects are dependent on the properties of the material and also lead
to changes in the resonant frequency and the amplitude of the oscillation. The
system is driven at resonance with constant amplitude and the power required
to do so is measured. Changes in viscosity and density affect the amount of
power required to maintain this constant amplitude.
Measurement of the power required to drive the sensor at constant amplitude,
the phase difference between the constant amplitude of the response signal and
Sensor Tip
Transducer Block
