Electric system of meter for measurements of density of mixtures conveyed in a pipeline

• US 4,048,844 A
• Filed: 03/22/1976
• Issued: 09/20/1977
• Est. Priority Date: 09/06/1974
• Status: Expired due to Term

• Current Assignee: Andrzej Dunikowski, Andrzej Zamarski, Jan Bednarczyk, Jerzy Keska, Tadeusz Pisarkiewicz
• Original Assignee: Andrzej Dunikowski, Andrzej Zamarski, Jan Bednarczyk, Jerzy Keska, Tadeusz Pisarkiewicz
• Inventors: Bednarczyk, Jan, Keska, Jerzy, Dunikowski, Andrzej, Zamarski, Andrzej, Pisarkiewicz, Tadeusz
• Primary Examiner(s): Gill, James J.
• Application Number:
  US05/669,461
• Time in Patent Office: 547 Days
• Field of Search: 324/61 R, 324/61 QS, 73/32 R, 73/61.1 R
• US Class Current: 73/32.00R
• CPC Class Codes: G01N 27/22 by investigating capacitance

Abstract

Electric system for a meter for measurements of density of the mixtures conveyed in pipelines. The system has a capacity sensor installed in a pipeline and being connected, via a capacitance transducer, with a system compensating temperature induced variations in capacity. The input of the said system is connected with a temperature sensor installed in the pipeline, while the output of the said system is connected with an indicator-recording system. Instead of being connected with the input of the system, the temperature sensor can be connected with the capacitance transducer which is then connected directly with the indicator-recording system. In the case of the mixture temperature'"'"'s being constant or varying within a narrow range, the electric system of the meter comprises a capacity sensor connected, via the capacitance transducer directly with the indicator-recording system.

Claims

1. An electric system for a meter for the measurement of the content of a mixture being conveyed in a pipeline, said system comprising a capacity sensor installed in said pipeline, a mixer, a compensation system for frequency variations, a capacitance transducer including a measurement generator having a first input connected to the capacity sensor, a second input connected to the compensation system for frequency variations and an output connected to said mixer, a reference frequency generator having an output connected to said mixer, a series circuit connected to the output of said mixer including a low-pass filter, an amplifier, an amplitude limiter, a differentiating system, a pulse clipper, a generator of standard pulses and an integrating system;

the series circuit having an output, an indicator-recording means, means for compensating temperature coupling the output of the series circuit with the indicator-recording means, and a temperature sensor in said pipeline, said means for compensating temperature being connected with the temperature sensor.

2. A system as claimed in claim 1, wherein said compensation system for frequency variation includes means which eliminates variations of frequency of the measurement of generator caused by changes of loss tangent in the said mixture.