Equipment variable

Generally, a eonstant value of a partieular operating/equipment variable is used. Some examples of seale-up based on eonstant operating variables as frequently used in fermentation are shown in Table 11-4. The properties, whieh ean be kept eonstant at the different seales, are ... 

The subject of plastic materials and equipment variables are important to understand so products can be properly designed and processed. Details on MATERIAL... 

With the passing of time and looking ahead these material and equipment variabilities continually are reduced due to improvement in their manufacturing and process control... 

These factors can be broadly classified as equipment variables, system variables, and operating variables. 

The equipment variables affecting the product quality shall be identified as critical for calibration. 

There is continuous progress in regard to reducing the existing plastic material and equipment variabilities (as there are for steel and other... 

The second tool the AIAG provided was a basic blueprint for getting at percent gage R R.They assigned measurement repeatability to equipment variability (EV) and reproducibility to appraiser variability (AV). The AIAG R R further defines PV as the actual part-to-part variation. Part variation can represent the process, the product, or the sample variation depending on how the measurement analysis is set up. 

Equipment variability assumes an appraiser (color technician) takes a part (final test piece) and measures that part two to three times using a gage (spectrophotometer). Appraiser variability is comprised of two to three appraisers doing the same thing for the same parts. This process is repeated for an additional 1-9 parts. Color values for the 2-10 parts are then entered into a measurement unit analysis form (Tables 26.1 and 26.2). 

Sheskey, P. J., and Hendren, J. (1999),The effects of roll compaction equipment variables, granulation technique, and HPMC polymer level on a controhed-release matrix model drug formulation, Pharm. Technol., 23, 90, 92, 94, 96, 98,100,102,104,106. 

E16 160P, PROCESS ELECTRICAL EQUIPMENT - VARIABLE FREQUENCY AC MOTORS... 

Examitie tbe experimental technique used (equipment, variables, etc.) in light of the mechanism proposed. Comment on the shortcomings of the analysis and compare with another study of this system presented in AiChE 2S(5), 855 (1982). 

Critical variables may be characteristic of the materials and/or the process. Materials properties have already been discussed briefly and of course the equipment variables for the unit operations will depend upon differences in the raw materials. However, there are general relationships between the roller compaction process variables and the properties of the resulting ribbons and granules that can aid in process design. 

In continuous differential extractors (columns) it has been convenient to think in terms of a height equivalent to a theoretical stage (HETS), and to correlate HETS as a function of system and equipment variables. Alternately, correlations may be obtained on the basis of the height of a transfer unit (HTU), which is more amenable to calculations which separately include the effects of backmixing.l H ... 

Other final control elements include relays to start or stop various equipment, variable-drive motors for fans or pumps, heavy load elec-trohydraulic actuators, and so on. 

EEG records can suffer from artifacts caused by subject or equipment variables. These include pen or amplifier misadjustments, head movements, or eye blinks. Therefore, artifacts in the EEG are removed by computer assisted visual inspection by an operator blind to the test day and subject... 

System variables. Viscosity, density and thermal conductivity of the liquid, interfacial tension, diffusion coefficients, chemical reaction rate constants Operating variables. Impeller speed, gas flow rate, liquid volume, pressure Equipment variables. Impeller type and diameter, geometry of the equipment. 

In the application of capillary-flow underfills, there are so many material, process, and equipment variables that empirical methods are widely used to establish the optimum processing conditions. The viscosity and flow properties of underfill adhesives are among the most important variables in rapidly filling different gap sizes and devices. A list of some commercially available underfill adhesives and their flow properties, as related to filler size and gap height, is given in Table 5.3. 

---