A method of estimating a flow rate, the method comprising the steps of: recording a time-domain series of signals from a sensor, the sensor being situated inside and/or extending into a conduit of a vortex flow meter; producing a time-domain series of values from the time-domain series of signals; producing a frequency-domain series of values from the time-domain series of values; determining a peak value S peak of the frequency-domain series, the peak value S peak being the largest value of the frequency-domain series; producing a first range series of values as a subset of the frequency-domain series of values; determining a moment value S of the first range series; and mapping the moment value S of the first range series to a range-derived flow rate, the range-derived flow rate being indicative of the flow rate of a fluid flowing through the conduit of the flow meter; characterized by comparing the peak value S peak to a predetermined threshold; and mapping the peak value S peak to a peak-derived flow rate, if the peak value S peak exceeds the predetermined threshold; wherein the peak-derived flow rate is indicative of the flow rate of the fluid flowing through the conduit of the flow meter; the method further comprising the steps of: if the peak value S peak exceeds the predetermined threshold: comparing the peak-derived flow rate to the range-derived flow rate; if the peak-derived flow rate and the range-derived flow rate differ by less than a first error margin: producing a first output flow rate based on at least one of the peak-derived flow rate and the range-derived flow rate; producing a first output signal from the first output flow rate, the first output flow rate being indicative of the flow rate of the fluid flowing through the conduit of the flow meter; and transmitting the first output signal to an output circuit. recording a time-domain series of signals from a sensor, the sensor being situated inside and/or extending into a conduit of a vortex flow meter; producing a time-domain series of values from the time-domain series of signals; producing a frequency-domain series of values from the time-domain series of values; determining a peak value S peak of the frequency-domain series, the peak value S peak being the largest value of the frequency-domain series; producing a first range series of values as a subset of the frequency-domain series of values; determining a moment value S of the first range series; and mapping the moment value S of the first range series to a range-derived flow rate, the range-derived flow rate being indicative of the flow rate of a fluid flowing through the conduit of the flow meter; characterized by comparing the peak value S peak to a predetermined threshold; and mapping the peak value S peak to a peak-derived flow rate, if the peak value S peak exceeds the predetermined threshold; wherein the peak-derived flow rate is indicative of the flow rate of the fluid flowing through the conduit of the flow meter; the method further comprising the steps of: if the peak value S peak exceeds the predetermined threshold: comparing the peak-derived flow rate to the range-derived flow rate; if the peak-derived flow rate and the range-derived flow rate differ by less than a first error margin: producing a first output flow rate based on at least one of the peak-derived flow rate and the range-derived flow rate; producing a first output signal from the first output flow rate, the first output flow rate being indicative of the flow rate of the fluid flowing through the conduit of the flow meter; and transmitting the first output signal to an output circuit. comparing the peak-derived flow rate to the range-derived flow rate; if the peak-derived flow rate and the range-derived flow rate differ by less than a first error margin: producing a first output flow rate based on at least one of the peak-derived flow rate and the range-derived flow rate; producing a first output signal from the first output flow rate, the first output flow rate being indicative of the flow rate of the fluid flowing through the conduit of the flow meter; and transmitting the first output signal to an output circuit. producing a first output flow rate based on at least one of the peak-derived flow rate and the range-derived flow rate; producing a first output signal from the first output flow rate, the first output flow rate being indicative of the flow rate of the fluid flowing through the conduit of the flow meter; and transmitting the first output signal to an output circuit.