PROCEDURE
PRESSURE CONTROL
EXPERIMENTATION
perform the Operative Unit 10;
carry out the connections as in Fig.4.2.1;
disconnect for a moment the cable that connects jack 4 (Module 33 Unit 6) to jack 7 (Module 33
insert a terminal of the digital voltmeter, set to direct current, in jack 1 Uref (SET POINT) and th
adjust the SET POINT voltage to 4V (0.8bar);
move the terminal of the digital voltmeter in jack 3 of the pressure sensor (Module 33D);
close the DRAIN VALVE;
turn the knob Kp of the PROPORTIONAL CONTROLLER to 75% and the knob Ki of the INTEGRA
restore the connection between jack 4 (Module 33 Unit 6) and jack 7 (Module 33 Unit 8): the pu
adjust the DRAIN VALVE so to make the pressure decrease in the tank: the pump starts again to
observe what happens: after a series of oscillations the systems establishes itself;
repeat the previous operations for the different values of Ki, Kp, Uref and DRAIN VALVE so to de
DATA AND RESULTS
DISCUSSION
The experiment on Pressure Control was performed. At first, the Position
Sensor’s characteristic was investigated. It was calibrated and connections as
described in the procedure were carried out. The set point was adjusted to 4V
corresponding to 0.8 bar. Drain valve was closed. Multimeter was then transferred
to the jack of the pressure sensor. The knob of the proportional controller was
turned to 75% while the knob of the integral controller was turned to 25%.
The pump was operated until it reached the set point value set with the
Uref. The pressure in the tank was decreased by adjusting the drain valve. Then,
the pump was operated again keeping a constant pressure in the tank. After a
series of oscillations the systems establishes itself, it was observed. Operations
were repeated to determine the best balance conditions of the system.
Voltage values were gathered corresponding to the pressure by adjusting
the controller to the respective value. It was observed that voltage is a function of
the pressure. The data was then graphed showing a continuous rise up of the
voltage as the pressure increases.
CONCLUSION
After conducting this experiment, I therefore conclude that it is essential to
calibrate the position sensor first before using to ensure the accuracy of the
equipment, quantifying and controlling errors or uncertainties within measurement
processes to an acceptable level. In this experiment, the characteristics of the
pressure sensor were shown. In terms of the operation of the pressure control, I
conclude that voltage is a function of the pressure. As the pressure increases, the
value of the voltage also does.
On the other hand, the operation of a closed loop control system was
determined. I conclude that the closed loop proportional-integral pressure control is
the most common control algorithm used in industrial control. It has a wide range
of operating conditions and partly to their functional simplicity, which allows to
operate them in a simple, straightforward manner. Its basic idea is to read a
sensor, then compute the desired actuator output by calculating proportional,
integral responses and summing those components to compute the output.
QUESTIONS
1) The output OFFSET represents:
a) The value assumed by the output quantity when the input quantity is
null
b) The value assumed by the output quantity when the input quantity is
maximum
c) The minimum variation of the input variation
2) Can the pressure transducers be used to measure the force?
a) Yes
b) No
3) In a proportional regulator (P):
a) The output signal is proportional to the integral of the input signal
b) The output signal is proportional to the input signal
c) The output signal is proportional to the speed with which the input
signal varies
4) In its use field, does the operation of the regulator P depend on the time?
a) Yes
b) No
LYCEUM OF THE PHILIPPINES UNIVERSITY-CAVITE
College of Engineering, Computer Studies and Architecture
Department of Engineering and Architecture
Experiment No. 5
Pressure Control
Date Performed: Name:
October 5, 2016 PANSACALA, HANNAH JOY M.
Date Submitted: Rating:
October 12, 2016
LYCEUM OF THE PHILIPPINES UNIVERSITY-CAVITE
College of Engineering, Computer Studies and Architecture
Department of Engineering and Architecture
Experiment No. 2
Temperature Sensor
Date Performed: Name:
August 17, 2016 PANSACALA, HANNAH JOY M.
Date Submitted: Rating:
August 24, 2016
