Device selection process

ANSI/ISA-84.00.01-2004-1 assumes that the owner/operator has considered and addressed the application requirements for the device. These are typically the same type of requirements considered for BPCS performance. These may include the technology required to detect the process conditions, to make decisions on the actions to take, and to take action on the process, the correct measurement or control ranges, the materials of constmction necessary for the environment and process conditions, and the correct installation practices. The device safety manual may outline different requirements based upon the SIL claim limit, and these must be followed. 

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Note 5 - Refer to Annex K for fault tolerance guidance. 

= fixed proerannniiibLe Ijinguage FVL = liill variabiUiy language-LVL = liiiiited vanability language 

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Directly related to the device selection process is whether an AICD or Biventricular system should be placed. These decisions also effect type of device, and lead systems employed. 

The impact of software language used on the device selection process... 

The device selection process in ANSI/ISA-84.00.01-2004 Clause 11.5 is illustrated in Figure L.1. This process defines when prior-use information is considered sufficient to Justify use of a device in an SIF application and no claim limit per lEC 61508 is required. The prior use evaluation fulfills specific requirements in ANSI/ISA-84.00.01-2004-1, Clauses 11.4 and 11.5.3 through 11.5.6. The methodologies and approaches for prior-use Justification may vary, depending on the device type (e.g. programmable versus non-programmable, field device versus PE logic solver), the device s installed base, and the owners/operators experience with the device. 

Any program developed in-house must be easy to use, or user-friendly. If the program has various options for input, analysis, computation, and output, then it must provide the user with a fast way to select them. To meet this need, the system is likely to be menu-driven. The peripheral interactive devices such as mice, joysticks, light pens, graphic tablets, and templates are helpful and often used to expedite the selection process. 

Under certain process conditions, high yields of carbon filaments can be obtained on the catalyst during the catalytic decomposition of methane. Currently, there is a great interest in these carbon filaments, as the unique properties exhibited by these materials can be exploited in a number of applications such as catalyst support, energy storage devices, selective adsorption agents and... 

The fact that the mutation-selection process has two parts. .. is brought vividly by Richard Dawkins in his book The Blind Watchmaker. Imagine a device that is something like a combination lock. It is composed of a series of disks placed side by side. On the edge of each disk, the twenty-six letters of the alphabet appear. The disks can be spun separately so that different sequences of letters may appear in the viewing window. 

The selection of chemicals that will provide the refiner or oil producer with a cost-effective emulsion-breaking program that meets or exceeds all performance parameters is usually the function of a chemical service company. The selection process has historically been viewed as a black art that produces as many failures as successes. This assessment of the situation has been realistic. However, with an ever-increasing understanding of emulsions and emulsion-breaking chemicals, the development of new test procedures and devices, and a well-organized method of chemical selection, many of the failures can be eliminated. 

Selection of fertilizable oocytes is one of the most important issues in in vitro fertilization (IVF) process. To date, the oocyte selection has been manually conducted by a skillful expert with a labor-intensive and time-consuming process. Recently, a new method for DEP-based separation of normal oocytes has been demonstrated using a microelectrode device [45]. The normal oocytes showed higher DEP velocity compared to the abnormal ones, which were cultured without medium for 3 days. This result shows that the DEP characteristics of oocytes can be a new criterion for selecting healthy oocytes in IVF. However, the conventional separation method based on the microfabricated electrodes has some limitation such as difficulty of manipulating samples before and after the selection processes. To develop a fully-automated system for the discrimination of normal oocytes for IVF, an ECD-based optoelectrofiuidic platform, which allows the programmable cell manipulation based on the optically induced DEP and the image-driven virtual electrodes, has been utilized [26]. 

The device fabrication process is illustrated in Figure 11.18a and can be described in the following steps. Step-I is the selection of two transparent substrates coated with a transparent conductor such as ITO, fluorine-doped tin oxide (FTO), or a high conductivity polymer, etc. In Step-II, one substrate... 

For these reasons, a great effort has been devoted, in the Ia.si 20 years or so. to the design of dmg delivery systems, i.e., systems in which the drug is associated with some other chemical, or Ls administered with the help of. some device or process, in such a way that the rate of relea.se, the target where ii musi be released, or both can be controlled (96,98). Ideally, a drug delivery system should be able to selectively supply the drug to the organ or tissue that requires it, and to do so at the required dose and time scale. 

The polymer selection is dependent mainly on the device type. However, there are a few considerations that are common to the selection process ... 

The selection process for a respirator is shown in Fig. 30.1. The following guidelines can simplify the selection process for respiratory protective devices for use at a spill scene. 

Device selection is a process to evaluate several parameters to ensure the device meets the safety requirements of the SIF. The process should include the identification of the target SIL, the device technology required to execute the safety function, whether the device is a PE or non-PE device, and if PE, what type of programming language is used. A typical process is illustrated in Figure L.1. 

Contact lenses may be used with respirators. Employers who have employees who wear corrective eyewear must be sure that the respirator does not interfere with the eyewear, make it uncomfortable, or force the employee to remove the eyewear. Employers should use the respirator selection process to make accommodations to ensure that their respirator-wearing employees can see properly when wearing these devices. 

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