Control need for

Quality records are identified, established, and maintained to provide evidence of conformity to requirements and of the effective operation of the quality management system. Quality records are legible, readily identifiable, and retrievable for quality records. A procedure is established to define the controls needed for the identification, storage, protection, retrieval, retention time, and disposition. 

Let us look next at the basic questions that we must ask and try to answer, while attempting to design a control system that will satisfy the control needs for a chemical process. 

Actuator network The IE actuator netwoik is based on a master/slave protocol and uses many of the NERVIA network components. It is dedicated to safety actuator control needed for example for the Engineered Safety Features,... 

The criticality safety index (CSI) is a number used to identify the control needed for criticality safety purposes. The control is provided by limiting the sum of the CSIs to 50 for shipments not under exclusive use and to 100 for shipments under exclusive use. 

Control Room Another approach is to have an isolated control room. Workers spend mostoftheirtimeinaroom supplied with clean, uncontaminated air. They look through windows to observe an operation that involves hazardous materials. The room encloses the displays and controls needed for the process. The separation prevents potential exposures to contaminants. 

It adopted the method of layered filling for making slope. Every layer thickness was 5 cm. It made each layered soil heavy bag according to the first control needed for the soil density. We scattered the soil in uniform and consolidate step by step in the model box. We firstly made the soil level before compacting the soil. We tamped the soil in a certain direction with a half tamping pressure. 

Fast boundary control needed for acute branching... 

In the pharmaceutical and food industry high-value-added products are manufactured mainly in batch process units. The heart of units is generally a jacketed stirred tank in which not only chemical transformation, but distillation, crystallisation, etc. can also be performed. As the aim of pharmaceutical industry is to produce high quality and purity products, the optimisation and control of operating conditions is the most efficient approach to produce efficiently, as well as to reach specific final conditions of the product in terms of quality and quantity (Cezerac, 1995). The S88.01 batch control standard defines three types of control needed for batch processing (ECES, 1997) ... 

The free oscillation devices cover in general a frequency range of 0.01 to 25 Hz. The precise temperature control needed for all viscoelastic measurements can be achieved by suitable design any mechanical connections with parts of the apparatus outside the thermostat must be made through members of low heat conductivity. 

Welding circuit and system more complex than TIG. Additional controls needed for plasma arc and filters and deionizers for cooling water mean more frequent maintenance and additional costs. 

Water activity control needed for processes involving condensation reactions. 

Gloss control Needed for polyolefin-based skins... 

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