What is IN PROCESS CONTROL?

A control that is monitoring part of an overall process. An example might be a PH probe located in the VAT to monitor the contents of a mixing vat. As water and chemicals are added the PH is monitored and specific amounts of chemicals may be added to adjust to a target PH as part of the recipe for what ever is being made.





The location of the control is within the process (inside the tank / VAT). Compare this to a worker periodically taking a sample of the contents and measuring PH with a bench top tester. This would be an Out of process control as the worker would be using a PH meter that is not physically in the process and could be used for several different processes. Usually this would be done as a QC check of the In Process Controls.What is IN PROCESS CONTROL?
A process can be ';in control'; or ';out of control';.





This is determined by plotting the results of a process on a ';Process Control Chart'; and looking for specific characteristics of the data. Control limits (upper and lower) are set by statistical process controls. When these limits are crossed, the process is considered to be ';out of control.';





For example, a piece part might have a dimension of 1.000 +/- .005. The pieces that come off this operation would be measured and plotted on a graph. The variability of the measurement would be analyzed. If the measurements started trends toward an out of tolerance condition, the process could be deemed out of control and changes to the process would be required.

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