【20150829 Daily Question】On the calculation methods of ratios
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. A positive-action pneumatic regulator with the control point set at 60 kPa. Now, if the integral valve is closed, and the proportionality setting is set at 50%, then when the measured value is 50 kPa while the setpoint is 60 kPa, the output value will be 35 kPa. The proportionality error in this case is __________.
Everyone who participates actively receives 2 points; those who answer correctly and provide in-depth analysis receive 5–9 points
Answer: 10% The pneumatic regulator is still in use
Reply: Not needed now. Old stuff, haha.
. A direct-acting pneumatic regulator with the control point set at 60 kPa. Now, if the integral valve is closed, and the proportionality setting is set at 50%, then when the measured value is 50 kPa while the setpoint is 60 kPa, the output value will be 35 kPa; the proportionality error in this case is ___10%_______.
The output value is 35 kPa, and its linearity error is _10%__.
Answer: 10%. . . . . . . . . . . . .
10%! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
10% (60-35) = 1/actual scale factor * (60-50). Actual scale factor = 0.4 = 40%. Scale factor error = 50% - 40% = 10%
For a direct-acting pneumatic regulator with the control point set at 60 kPa, if the integral valve is closed and the proportional gain is set at 50%, then when the measured value is 50 kPa while the setpoint is 60 kPa, the output value will be 35 kPa; the proportional error in this case is ___10%___.