Report on Sine-wave Vibro Viscometer - A&D COMPANY, LIMITED - #1

New Viscosity Measurement Instrument only from A &D Company, Limited

This report presents an overview of our new viscometer, SV-10. This instrument is designed to measure the viscosity of liquids and, as a result of an advanced new technology, provides accuracy and performance not normally found with other devices of this nature.

SV-10 Sine wave Vibro Viscometer

The SV-10 utilizes a whole new concept in the method of measuring viscosity, employing a tuning forks vibration system as a detector. It is designed to measure the viscosity of fluids in either a stationary or flowing state and is used in both laboratory and process control applications.

The SV-10 is designed so that a pair of plate springs with a sensitive plate mounted on the end is subjected to a resonance vibration in reverse phase, at a constant frequency, to detect a difference in viscous resistance generated between the sensitive plates inserted in the sample and the sample as a vibration of the driving current. The drive current is proportional to the viscosity resistance. Calibration is accomplished by using a liquid of standard viscosity and the measurement is stored in memory. The viscosity of a sample can be obtained by measuring the drive current for constant amplitude at the plate springs.

Measurement Principle

The specific feature of SV-10 is to employ a tuning fork vibration technology and a resonance feature for sensors. This feature removes the repulsive force to the main frame generated during measurement and thus stabilizes the sine-wave vibration. Consequently, high accurate viscosity measurement can be conducted.

Figure-1 shows the viscosity detection mechanism of SV-10. The operation is briefly described as follows;

1. A pair of plate springs with a sensitive plate mounted on the end is vibrated at a resonance frequency in reverse phase at 30Hz.

2. The difference in the viscous drag generated between the sensitive plates and samples is detected as the budget of the driving current, which is necessary to maintain constant amplitude.

3. The viscosity of samples is calculated by using the proportional relation between the driving current and the viscous resistance.

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