Apparatus and method for measuring fluid flow over a wide range of fluid flow conditions and viscosities
Flow rate computer
Temperature correction systems for a fluid flow meter
Flowmetering method and device
Apparatus for correcting measured gas flow
Instrumental error compensation circuit for flow meter
Device for measuring liquid flow volume with temperature compensating Patent #: 4720800
ApplicationNo. 449509 filed on 12/04/1989
US Classes:73/861.77, Using rotating member with particular electrical output or circuit73/861.03, Digital702/46, Count or pulse702/100Fluid or fluid flow measurement
ExaminersPrimary: Ruehl, Charles A.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG01F 015/02
Foreign Application Priority Data1987-04-24 SE
AbstractIn a method for measuring the volume of a liquid flow through a measuring chamber (2) during a measuring period, a pulse generator (12) is caused to emit a number of pulses corresponding to the volume. In the measurement, the measuring period is divided into a number of measuring intervals. During each measuring interval, the pulses from the pulse generator (12) are detected, each detected pulse is multiplied by a flow correction factor, the corrected pulse values are added to a summation variable, and this summation variable is multiplied by a volume conversion factor for determining the liquid volume. The separate determined liquid volumes are thereafter summed up for all measuring intervals during the measuring period.A measuring apparatus for measuring the volume of a liquid flow through a measuring chamber (2) has a pulse generator (21, 23) for generating a number of pulses corresponding to the volume, has time base means (33) for dividing the measuring period into measuring intervals, memory means (34) for storing one or more correction factors, pulse-correcting computing means (24, 25) for multiplying each detected pulse by said one or more correction factors, adder means (26, 27) for adding the corrected pulse values, and multiplier means (35) for multiplying the added corrected pulse values by a volume conversion factor.