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Pulse Counter Flow Controller

IP.com Disclosure Number: IPCOM000094647D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Masterson, RJ: AUTHOR

Abstract

Liquid flow in a pipeline is often measured by a turbine flow meter. These meters usually provide a pulse or sine wave output having a rate or frequency proportional to the flow rate of the liquid being measured. This flow controller uses the pulse type output of the turbine flow meter to control the position of a valve with reference to a set point. Such is effected without the necessity for an intermediate conversion to a current or pneumatic signal.

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Pulse Counter Flow Controller

Liquid flow in a pipeline is often measured by a turbine flow meter. These meters usually provide a pulse or sine wave output having a rate or frequency proportional to the flow rate of the liquid being measured. This flow controller uses the pulse type output of the turbine flow meter to control the position of a valve with reference to a set point. Such is effected without the necessity for an intermediate conversion to a current or pneumatic signal.

Turbine flow meter 1 produces output pulses on line 2 proportional to the rate of liquid flow through pipeline 3. Set point oscillator 4 develops a pulse type signal on line 5 representing a desired flow in pipeline 3. The output pulses from meter 1 on line 2 are applied to the down input of reversible counter 6. The output pulses from oscillator 4 on line 5 are applied to the up input of reversible counter 6.

Counter 6 can be a 7-stage reversible binary counter in which the zero position is represented by a bit in the highest order position. This allows representation of a negative voltage by the absence of this bit and the representation of a positive count by the presence of the bit. The output of the highest order bit controls a forward-reverse control 7.

When the difference between the rate of pulses being applied by oscillator 4 and the rate of pulses applied by meter 2 is such that counter 6 accumulates a difference count greater than three, an output appears on the lines leadin...