FLOW LOOP CONTROL (PI MODE)

 

FLOW LOOP CONTROL (PI MODE)

 

AIM: To study the action of ‘Proportional Integral Controller’ for a flow loop process control using process control software installed in a PC.

EQUIPMENTS REQUIRED:

Flow meter                :           Orifice with DP sensor

Range                         :           300 LPH

Pump                          :           FHP monoblock pump

Sensor                        :           Orifice plate

Control value             :           ½ glove value (linear)15mm stem travel

Actuator                     :           Pneumatic actuator (input 3-15 PSI)

I to P converter         :           I/p 4-20mA and O/p 3 -15  PSI

Data Logger               :           16 Bit ADC 8 channel  with 12bit DAC

                                                Interfaced with PC through RS-232 serial port

Controller output     :           4-20mA

Power                 :           230V AC, 50Hz, Power supply to drive the   monoblock pump

System requirement :           PC (Pentium III or IV)

Microsoft Windows XP or ME

Microsoft Excel 2000 or above version, Serial Communication Port (RS-232)

Procedure: After installing the PID process loop controller software, go to start menu. Start the software the front end of the software which is having empty fields to be entered appears enter the students name in the ‘Enter Name’ next. Enter batch name in the field enter batch name in the field ‘Enter Batch’ select the comport to which the instrument is connected in Enter Com Port drop down box next click on ‘Start Test’ icon. The PID process loop controller (flow) window will open set the setpoint and select ‘Set Point’ type as ‘Manual’ now appears to type the file name to which the data is to be stored.

Result: The experiment was conducted successfully and the graph of the trend plot has been drawn on graph sheet.