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3.
Apply certain amount of pressure and record the voltage corresponding to the
pressure.
4.
Increase the applied pressure by 5 psi and record the voltage. Repeat this step
until the higher range of the pressure transmitter has been reached.
5.
Repeat the same steps for other two pressure transmitters.
These steps were followed and Figures 3.17−3.19 show the calibration results for the
three pressure transmitters. A linear trend line is also shown in each of the graphs along
with respective R
2
value. This trend line is a curve fit for the linear relation between the
applied pressure and output voltage. The linear equation is also shown in the graph. This
equation is set as a gain (
Mx
+
B
) in the data acquisition unit to read the output directly in
terms of pressure drop.
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