How do you calibrate flow transmitters?

To calibrate flow transmitters, first, ensure that the transmitter is installed correctly and that all connections are secure. Then, use a known reference flow measurement, such as a gravimetric or volumetric method, to compare against the transmitter's output. Adjust the transmitter settings, such as zero and span, to align the output with the reference measurement. Finally, verify the calibration by repeating the process at various flow rates to ensure accuracy across the range.