Filling In the Component Balance Control Tab

The Control tab contains the settings that control the behavior of the Component Balance Analysis Rule. This includes the following:

Calculations to execute and unit of measure options.
Solution convergence parameters, if applicable. The Convergence Group controls parameters that apply to nonlinear balances. Sigmafine treats linear and nonlinear balance solutions in different ways. When running a reconciliation, Sigmafine checks the balance constraint equations to determine whether they are linear (mass or volume balance), or nonlinear (heat, density or component balance). For example, a + b - c = 0 describes the form taken for a linear problem, while a2 × b + c/d = 0 describes a nonlinear problem.
For linear constraints Sigmafine generates the solution without iteration. Convergence parameters only apply to nonlinear balances, such as density, heat and component. Sigmafine has three convergence parameters: Maximum Iterations, Minimum Step Size, and Convergence Gradient. For more information about these parameters, see table Control Tab - Convergence.
Calculation output and diagnostic options.

The Control tab of the Component Mass Balance Configuration window is shown in the following image.

Figure 278: Component Mass Balance Configuration - Control tab

SHOULDN'T THIS WINDOW SAY "COMPONENT MASS BALANCE CONFIGURATION"?

The following tables define the parameters configured on the Control tab.

Control Tab – Options Table

Parameter	Description
Solvability	Select for Sigmafine to do a solvability analysis and report the solvability for the flows, transfers, and inventories.
Influences	Select to calculate the impact that each flow, inventory, and transfer measurement has on the final reconciled solution.
Propagate Service Status	Select for Sigmafine to set balance type elements to out of service if all connected elements are also set to out of service, or set all connected elements out of service if balance point is out of service.
Unit of Measure	Selects the input unit to the Sigmafine Reconciliation Solver. This is also the unit used in reporting to the log file.
Set OS upon BAD input

Control Tab - Convergence

Parameter	Description
Maximum Iterations	Applicable to non-linear balances. Specify the highest number of iterations to be performed for the convergence. The default is 10, but most solutions can be solved within five iterations.
Minimum Step Size	Specify the minimum step size for the convergence. The default is 0.0001. Step size is expressed in relation to tolerance. A problem is considered solved if the step size is smaller than the value specified here. For example, if you specify a minimum step size of 0.001, the balance is considered to have converged if the step size is less than 0.1% of the range expressed by the tolerance.
Gradient	Read-only field displays the initial rate of change of the convergence. Sigmafine chooses an initial gradient based on the minimum step size. This gradient also can be adjusted as the calculation occurs. For example, if a step is larger than the previous step, Sigmafine increases the steepness of the gradient to stabilize convergence. If a step is much smaller than the previous step, Sigmafine decreases the gradient to accelerate convergence.
Linear Balance	If checked the analysis rule uses the linear balance algorithm to solve the component balance. Maximum Iterations, Minimum Step Size, and Gradient are not used with this option since the solution does not require iterations.

Control Tab - Output

Parameter	Description
Confidence	Read-only field displays the confidence calculation, which is derived from the tolerance setting. Setting the tolerance to 2 means the confidence is 0.95, if the tolerance is set to 3 then the confidence is 0.99.
Tolerance	Select the number of standard deviations for which tolerance of the measurement is to be defined.
Auto Diagnostics	0: No diagnosis analysis.1: Auto-diagnosis. The two most severe measurement errors will be noted in the log file. Trace must also be set to 1. If Trace is set to 2, then details of all severe errors are listed in the log file.2: Auto-rejection. The most severe measurement errors will be marked as out of service; reconciliation calculation is performed again with the next measurement. The process is repeated until the severity of the balance points is between –1 and 1, inclusive.
Trace	0: No trace analysis.1: Details of the two most severe measurement errors are noted in the log file.2: Details of all measurement errors with a severity greater than the tolerance are noted in the log file.
Pre / Post Validation	You can do two types of gross error checks on the Sigmafine Model Case data: pre-validation and the post-validation. The pre-validation performs checks on the measured data and the Model configuration. The post-validation performs checks on the reconciled results. Click to configure the Gross Error Analysis Rules. For details about how to configure these see Gross Error Analysis Rule.