A system for measuring flow of process fluid through process piping, comprising: a flow restriction in the process piping generating a differential pressure in the process fluid between an upstream side of the restriction and a downstream side of the restriction, the differential pressure related to flow of the process fluid; first and second upstream pressure transmitters each coupled to the process piping on the upstream side of the flow restriction, the first and second upstream transmitters (104 C, 104 D) having respective first and second upstream pressure sensors (106C, 106D) and measurement circuitry measuring first and second upstream pressures of the process fluid, respectively, and responsively transmitting first and second upstream transmitter outputs related to the measured first and second upstream pressures; first and second downstream pressure transmitters each coupled to the process piping on the downstream side of the flow restriction, the first and second downstream pressure transmitters (104A, 104B) having respective first and second downstream pressure sensors (106A, 106B) and measurement circuitry measuring first and second downstream pressures of the process fluid and responsively transmitting first and second downstream transmitter outputs related to the measured first and second downstream pressures; a controller configured to calculate flow of the process fluid based upon a pressure difference between at least one upstream pressure and one downstream pressure and further configured to identify a degradation in at least one of the pressure transmitters based upon at least two pressure measurements. a flow restriction in the process piping generating a differential pressure in the process fluid between an upstream side of the restriction and a downstream side of the restriction, the differential pressure related to flow of the process fluid; first and second upstream pressure transmitters each coupled to the process piping on the upstream side of the flow restriction, the first and second upstream transmitters (104 C, 104 D) having respective first and second upstream pressure sensors (106C, 106D) and measurement circuitry measuring first and second upstream pressures of the process fluid, respectively, and responsively transmitting first and second upstream transmitter outputs related to the measured first and second upstream pressures; first and second downstream pressure transmitters each coupled to the process piping on the downstream side of the flow restriction, the first and second downstream pressure transmitters (104A, 104B) having respective first and second downstream pressure sensors (106A, 106B) and measurement circuitry measuring first and second downstream pressures of the process fluid and responsively transmitting first and second downstream transmitter outputs related to the measured first and second downstream pressures; a controller configured to calculate flow of the process fluid based upon a pressure difference between at least one upstream pressure and one downstream pressure and further configured to identify a degradation in at least one of the pressure transmitters based upon at least two pressure measurements.