Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1990-07-17
1991-10-08
Raevis, Robert
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
G01N 1114
Patent
active
050543130
ABSTRACT:
Electronic control circuitry for obtaining precise inline process control data as to viscosity of fluids over a wide viscosity range, with high tolerance of ambient noise and vibration. An electromechanical transducer with an oscillating sensor is immersed in a flowing liquid, with the power required to sustain predetermined oscillation parameters being a measure of viscosity-density product. The gain of a variable gain amplifier which provides positive feedback to sustain oscillation is controlled in response to the integrated error signal output of a comparator which compares a DC value corresponding to the RMS amplitude of mechanical oscillation with a DC reference value. The monitoring of RMS amplitude rather than peak amplitude (as is done by a phase-sensitive sample-and-hold arrangement in the prior art), coupled integration of the error signal, results in a great improvement in immunity to ambient noise and vibration. Other features includes automatic calibration and temperature compensation whereby viscosity at a desired temperature can be determined even though the measurement is made at different temperature.
REFERENCES:
patent: 3762429 (1973-10-01), Fitzgerald et al.
patent: 4524610 (1985-06-01), Fitzgerald et al.
Batton John
Dougherty Edmond
Fitzgerald John V.
Matusik Frank J.
Stone John
Kau Shu-Cheng
Lessler Arthur L.
National Metal and Refining Company, Ltd.
Raevis Robert
LandOfFree
Control circuitry for viscosity sensors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control circuitry for viscosity sensors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuitry for viscosity sensors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-250031