2.2.6 Sensitivity of measurement
The sensitivity of measurement is a
measure of the change in instrument output that occurs when the quantity being
measured changes by a given amount. Thus, sensitivity is the ratio:
scale deflection
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value of measure and
producing deflection
The sensitivity of measurement is therefore the slope of the straight
line drawn on Figure 2.6. If, for example, a pressure of 2 bar produces a
deflection of 10 degrees in a pressure transducer, the sensitivity of the
instrument is 5 degrees/bar (assuming that the deflection is zero with zero
pressure applied).
If these values are plotted on a graph, the straight-line relationship
between resistance change and temperature change is obvious.
For a change in temperature of 30°C, the change in resistance is 7 [1]. Hence the
measurement sensitivity = 7/30 = 0.233 [1]/°C.
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