Control de temperatur

a | Automatic Control Laboratory |
PRACTICE REPORT
PRACTICE 1:INSTRUMENTATION DIAGRAMS AND MATHEMATICAL ANALYSIS

INSTRUCTOR | Name of your Instructor |
Sesion Schedule | Friday (6:00pm) |
TEAM NAME | Team 6 |
TEAM MEMBERSABCD | Eliézer Serafín Rodríguez Franco 997923Jorge Alberto Cabrera Espinosa 997998José Tecalco Viñas 998065 |
Reportevaluation
Section | Weight | A | B | C | D |
Objectives | 5 | |
Development | 50 | |
Personal Conclusion | 30 | | | | |
General Comments | 10 | |
Bibliography | 5 | |
Total | 100 | | | | |
Practice Assessment
Section | Weight | A | B | C | D |
Diagnostic Exam | 10 | | | | |
Session performance | 30 | | | | |
Report evaluation | 60 | | | | |
Total |100 | | | | |
Assessment Comments:
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Objectives (5 pts)
* Identify the main symbols used in the instrumentation diagrams and be familiar with the standard of the Instrument Society of America (ISA) to identify the correct indicator or controllername in a work station.
* Differentiate between an open control loop system and a close control loop system, and the basics modes of operation of a control (automatic and manual).
* Apply the knowledge of control engineering to identify a first order model with dead time through a graphical method or the two point method.
* Apply the knowledge of control engineering to identify asecond order model with dead time through a mathematical analysis.

Development (50 pts)

ISA DIAGRAM OF THE LEVEL CONTROL SYSTEM
This is the diagram showed in the practice

The next is the diagram corrected

The LIC is the controller and it sends an electrical signal to the transducer, this sends a pneumatic signal to a valve that closes and opens depending on the value of the input. Theflow transmitters also send information to the level recorder by an electrical signal. The level indicator says how much water is in the tank, under it there is a level transmitter that sends to the level controller how much water is in the tank through an electrical signal. Under the tank there are pipes that lead the water to a deposit, but before the water passes through a flow transmitter,after this the water passes through a manual valve and/or an electrical valve.

MAIN SPECIFICATIONS OF THE LEVEL TRANSMITTER, TRANSDUCER AND VALVE
Level transmitter data
Brand: Honeywell
Model: STD924-E1H-00000-1C.MB.S2.TC-B77P
Factory Cal. 0 to 100 INH20 39.2F/0 to 249.8 mBar Ranged to 0 to 100 INH20-39.2F
Costumer ID: Spare
Temperature Limits (DC Body) from -40 to 125°C
Temperatureenvironment : -40 to 85°C
ST3Q00S900R300
Max Voltage: 42.4V
Imax : 225mA
Ci = 4.2nF
Max power: 1.2W
Supply: 11-42 VDC
Output: 4-20 mA DC
Body Model: STD924R-A10-B07P
Serial: 0449 C2622793001006
Press rating: 3000 psi
Range limits: -20 a 400 in

Transducer Data
Brand: DWYER
Current to Pressure transducer
Model: 2213-0
Input: 4-20 mA
Output: 3-15 psig
Supply: 20 psig
Serial number:M2213I004464

Valve Data
Brand: W.E.Anderson
LIN-E-Aire control valve
Num series: 2000VA32.230.A.2213.0
Range: 3-15 Psi
Air : to 0
Size :.5
Orifice ---
Body Material: Bronce
Trim material Stainless steel
Inner valve LIN
Body rating 250 psi

MODEL IN OPEN LOOP
Graph of the transient response

As we can see in the graph, this was the transient response in open loop, we changed thevalue of the output and we had to wait until the system reached the steady state. We proposed a step of 50 and this was the response that we got. The PV and the SP started at the time 24413s and reached the steady state at 24766. The values of 28% and 63% are shown below.
FOPDT Model
The Δm(t) represents the input variable, in manual mode we have to wait until the process variable is in stable...