 Home
 Products
 Integration
 Tutorial
 Barcode FAQ
 Purchase
 Company
barcode reader project in c#.net T1dl+C1 where in Software
T1dl+C1 where Scanning ANSI/AIM Code 128 In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Code 128C Maker In None Using Barcode creator for Software Control to generate, create Code128 image in Software applications. 1 1 = 1 + klVIF Co + F(l + klV/F)m V = F+k,V
Code 128 Code Set C Reader In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Code 128C Creator In C# Using Barcode creator for Visual Studio .NET Control to generate, create Code128 image in VS .NET applications. (11.3) Create Code128 In .NET Using Barcode creation for ASP.NET Control to generate, create Code 128 image in ASP.NET applications. Code 128A Drawer In Visual Studio .NET Using Barcode printer for Visual Studio .NET Control to generate, create Code 128 image in .NET applications. BLOCK DIAGRAM OF A CHEMICALREACTOR CONTROL SYSTEM
Draw Code 128 Code Set B In Visual Basic .NET Using Barcode printer for .NET Control to generate, create Code 128C image in .NET framework applications. UPCA Supplement 5 Creation In None Using Barcode encoder for Software Control to generate, create UPC Symbol image in Software applications. At steady state, dclldt = 0, and Eq. (11.3) becomes Cls = 1
Code 39 Extended Creator In None Using Barcode generator for Software Control to generate, create Code 39 Extended image in Software applications. Making Barcode In None Using Barcode creator for Software Control to generate, create barcode image in Software applications. I + klVIF cos +
Data Matrix Generation In None Using Barcode generator for Software Control to generate, create Data Matrix ECC200 image in Software applications. Draw EAN / UCC  13 In None Using Barcode generator for Software Control to generate, create GS1 128 image in Software applications. 1 F(l + k,V/F)mS
Painting ISSN  13 In None Using Barcode generator for Software Control to generate, create International Standard Serial Number image in Software applications. Universal Product Code Version A Printer In None Using Barcode printer for Font Control to generate, create GS1  12 image in Font applications. where s refers to steady state. Subtracting Eq. (11.4) from (11.3) and introducing the deviation variables Cl = Cl  Cl$ co = co  cos Generate Data Matrix In ObjectiveC Using Barcode creator for iPad Control to generate, create Data Matrix ECC200 image in iPad applications. Generating Bar Code In Visual Basic .NET Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in .NET framework applications. M=mm, Decoding Barcode In .NET Framework Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications. EAN13 Maker In .NET Framework Using Barcode printer for VS .NET Control to generate, create UPC  13 image in Visual Studio .NET applications. give
EAN 13 Generator In Java Using Barcode encoder for Java Control to generate, create EAN13 image in Java applications. Scan Code 128 Code Set C In Visual C#.NET Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications. ++1= * d t
1 + ;J,F Co + F(l + :,VIF)M
Taking the transform of Eq. (11.5) yields the transfer function of the first reactor: Cl(S) = l/(l + klV/F) 71s + 1
c (s) + W U + W WIMM(sj
71s + 1
(11.6) A material balance on A around tank 2 gives
V% = F(cl  c2)  k2Vc2
As with tank 1, this last equation can be written in terms of deviation variables and arranged to give 1 dC2 +c2= 1 + k2VIF Cl r2 d t where V *2 = F+k2V c2 = c:!  C& Taking the transform of Eq. (11.8) gives the transfer function for the second reactor: l/(l + k2V/F) (11.9) C2(s) = Cl(S) 72.7 + 1 To obtain some numerical results, we shall assume the following data to apply to the system: Molecular weight of A = 100 lb/lb mole PA = 0.8 lb mole/ft3 QS = 0.1 lb mole A/ft3 F = 100 cfm ms = 1.0 lb mole/min LINEAR CLOSEDLOOP SYSTEMS
k2 = 3 min v = 300 ft3 Substituting these constants into the parameters of the problem yields the following values: 71 = 2 min 72 = 1 min CL = 0.0733 lb mole Alft3 c2s = 0.0244 lb mole Alft3 m,/pA = 1.25 cfm Control Valve
Assume that the control valve selected for the process has the following characteristics: The flow of A through the valve varies linearly from zero to 2 cfm as the valvetop pressure varies from 3 to 15 psig. The time constant 7, of the valve is so small compared with the other time constants in the system that its dynamics can be neglected. From the data given, the valve sensitivity is computed as K, zz  2  0 15  3 i cfmpsi
Since m,/pA = 1.25 cfm, the normal operating pressure on the valve is
ps=3+ ,(15  3) = 10.5 psi
(11.10) The equation for the valve is therefore m = [1.25 + K,(p  10.5)]p.4 In terms of deviation variables, this can be written M = K,pAP
(11.11) (11.12) where A4 = m  1.25~~ P = p  10.5 Taking the transform of Eq. (11.12) gives
M(s) = K,,~A P(s) (11.13) as the valve transfer function.
BLOCK
DIAGRAM
CHEMICALREACTOR
CONTROL
SYSTEM
Measuring Element
For illustration, assume that the measuring element converts concentration of A to a pneumatic signal. Specifically, the output of the measuring element varies from 3 to 15 psig as the concentration of A varies from 0.01 to 0.05 lb mole A/ft3. We shall assume that the concentration measuring device is linear and has negligible lag. The sensitivity (or gain) of the measuring device is therefore 15  3 K, 0.05  0.01 = 300 psi/(lb mole/ft3) Since czS is 0.0244 lb mole/ft3, the normal signal from the measuring device is 0.0244  0.01 0.05  0.01 (15  3 ) + 3.0 = 4.32 + 3.0 = 7.32 psig The equation for the measuring device is therefore b = 7.32 + Km(c2  0.0244) (11.14) where b is the output pressure (psig) from the measuring device. In terms of deviation variables, Eq. (11.14) becomes B = K,C2 (11.15) whereB = b7.32andC2
= c2Q. The transfer function for the measuring device is therefore (11.16) A measuring device that changes the units between input and output signals is called a transducer; in the present case, the concentration signal is transduced to a pneumatic signal. Controller
For convenience, we shall assume the controller to have proportional action, in which case the relation between controller output pressure and error is (11.17) p = ps + Kc(c~  b) = ps + K,E where CR = desired pneumatic signal (or set point), psig K, = controller sensitivity, psig/psig E =error = CRb,PSifJ In terms of deviation variables, Eq. (11.17) becomes
P = K,E
(11.18) The transform of this equation gives the transfer function of the controller (11.19) LINEAR CIJXEDLOOP
SYSTEMS
Assuming the set point and the signal from the measuring device to be the same when the system is at ,steady state under normal conditions, we have for the reference value of the set point CRS = b = 7.32 psig The corresponding deviation variable for the set point is CR = CR  cRs Tbansportation Lag A portion of the liquid leaving tank 2 is continuously withdrawn through a sample line, containing a concentrationmeasuring element, at a rate of 0.1 cfm. The measuring element must be remotely located from the process, because rigid ambient conditions must be maintained for accurate concentration measurements. The sample line has a length of 50 ft, and the crosssectional area of the line is 0.001 ft2. The sample line can be represented by a transportation lag with parameter volume rd=flowrate= (m0.001) z o 5 min 0.1 * The transfer function for the sample line is, therefore, eTds = eo.5s Block Diagram We have now completed the analysis of each component of the control system and have obtained a transfer function for each. These transfer functions can now be combined so that the overall system is represented by the block diagram in Fig. 11.2. In Fig. 11.2, a block containing the transfer function K, is placed at the positive inlet of the comparator in order to relate the set point in concentration units to a pneumatic signal, which matches the units of the feedback signal B. If the pneumatic controller in Fig. 11.2 were replaced by an electronic or computer

