Differential Pressure Transmitter Calibration Function and Definition - So you just got that new differential pressure transmitter (ex. Flowmeter) and you are about to install it. How do you know it's accurate? How accurate? Differential pressure calibration answers these questions. But what is calibration, and how is it applied to flowmeters? One dictionary defines "to calibrate" as "to standardize (as a measuring instrument) by determining the deviation from a standard so as to ascertain the proper correction factors." There are two key elements to this definition : determining the deviation from a standard, and ascertaining the proper correction factors.
Deviation From a Standard
To measure deviation, it is first vitally important to determine the actual flowrate. In flowmeter calibration, this is normally done by one of two methods: using a master meter, or weighing the flow to get a gravimetric reading of mass flow.
Correction Factors
The second component of calibration is determining the proper correction factors. It is easy to think of flowmeter calibration in terms of adjusting a bathroom scale, where we simply use a knob to zero the scale when there is no weight on it. Once this adjustment is made, the scale is "calibrated" and we may then assume that it reads correctly. But you may notice that you always seem to weigh more on your own scale than you do at your health club. Both scales may be zero-adjusted, yet one may consistently give higher weight readings than the other.
Calibration Definition
Calibration Definition is the process of establishing the relationship between a measuring device and the units of measure. This is done by comparing a devise or the output of an instrument to a standard having known measurement characteristics
