CORIOLIS MASS FLOW METRE, METHOD OF PHASE DIFFERENCE OR SIGNAL TRAVEL TIME COMPENSATION, METHOD OF DETERMINING SIGNAL TRAVEL TIME, METHOD OF DETERMINING PICKUP SIGNAL PHASE DIFFERENCE OR TRAVEL TIME, AND METHOD OF DETERMINING PICKUP SIGNAL TRAVEL TIME

摘要

FIELD: instrument making.;SUBSTANCE: proposed invention aims at compensating the Coriolis flow metre input circuit transmission errors. Reference signal (R) is imposed simultaneously on the first and second signals (S1,S2) of the flow metre measuring pipe oscillation pickups with the help of at least one oscillator (33, 34). Pickup first and second signals (S1', S2') and reference signals (R1', R2') are filtered off from auxiliary signals (H1', H2') generated in input circuits (35, 37). The current phase difference between two reference signals (R1', R2') or signal travel time (Δφ(R1', R2'), Δt(R1', R2')) is determined to get (Δφ(R1', R2'), Δt(R1', R2')) to further on, compensate the phase difference or signal travel time (Δφ(S1', S2'), Δt(S1', S2')) between two pickup signals (S1', S2') generated in input circuits (35, 37). Two or more different-frequency reference signals (Rx, Ry, Rz) can be used.;EFFECT: higher accuracy.;11 cl, 6 dwg