Whenever separately calibrating portions of a system, maintain adequate accuracy rations for each calibration and calculate the overall system accuracy by the previously described method. You can often further separate the flowmeter itself into a wetted primary (the portion generating the flow signal) and a flow secondary (the portion providing the signal processing). In the case of a flowmeter with a transmitter and an indicator, a common practice is to wet calibrate the flowmeter and separately dry calibrate the transmitter and indicator. It is also appropriate to calibrate different portions of such a system by different methods. It is common to make measurements using a combination of several instruments acting together. Dry calibration using flow simulation by electronic or mechanical means.Measurement check of physical dimensions and use of empirical gables relating flow rate to these dimensions.Wet calibration using actual fluid flow.You can calibrate flow measurement devices by three methods :
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