Batching Best Practices

This intent of this paper is to present a few Best Practices I have discovered over the years that lead to an improved performance of ingredient automation (batching) systems. Any welding should be done prior to installation of the load cells. Proper drainage should be provided to prevent the load point assembly from standing in water. All load cells must be on the same plane (level) within 0.5 degrees of each other (which is approximately an inch over 10 feet). In any batching application, the volume of material in transit between the shutoff device and the actual batch container has an impact on the ability to perform fine batch adjustments. Piping best practices are also important. Some liquid flow sensors require staying flooded in order to provide a reliable feedback signal. Nearly all flow devices need to be isolated from vibration and many flow devices (liquid and gas) assume a uniform velocity profile for their approach and exit. Even though today instruments are more tolerant of poor location, it is still best to locate the instruments with some consideration of the approach and exit conditions. …

Buying Decisions for ISA-88 Batching Solutions

PAC:  Programmable Automation ControllerPhase:  The lowest level of procedural element in the procedural control model.  It provides an interface to basic control.Physical Model:  A representation within the ISA-88 product of the physical assets that comprise the batching system.Procedural Model:  A representation within the ISA-88 product that describes a set of activities to beperformed by the Physical model to produce a product or type of product.Unit:  A collection of associated control modules and/or equipment modules that can carry out one or more major processing activities. This paper intends to address the decision making around formal ISA-88 batching products such as Rockwell Automation’s FactoryTalk® Batch. Going forward we will simply use “products” as the expression for formal products that embrace the full ISA-88 standard. There are elements of the ISA-88 standard that have migrated into well- structured applications that don’t use a formal product. Such structure can prove to be helpful and has even gained acceptance outside of the batching industry. This paper, however, intends to help guide the thought process through the evaluation of whether or not you actually need and would benefit from such formal products– and in many cases you would indeed benefit, but not …