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Provides forms (checklist) to promote uniformity in instrument specification, both in content and form, by listing and providing space for principal descriptive options. These forms facilitate quoting, purchasing, receiving, accounting, and ordering procedures.NOTE: ISA-20-1981 has been superceded by ISA-20.00.03-2001 and the ISA-TR20.00.01-2007 Specification Forms.Scope:These forms are intended to assist the specification writer to present the basic information. In this sense they are ‘short-form’ specifications or ‘check sheets’ and may not include all necessary engineering data or definitions of application requirements. While the types of instruments described by these forms are more common to the process industries the forms should also prove useful in other areas if special requirements are defined elsewhere.Some forms consist of a primary sheet and a secondary (tabulation) sheet. The primary sheet may be used by itself to specify a single instrument or to specify general requirements for a series of similar instruments which are then tabulated on the secondary sheet.The heading used on all forms is designed to permit the user to add company name, plant location, trade mark, or specific project data.The specification forms included in this standard are intended to cover the most commonly used instruments. The list is not a complete catalog of instruments and control valves available. It is intended that new forms shall be added with each general revision of this standard.An instruction sheet is provided for each form to explain the terms used and the intended procedure. The instructions are keyed to the form by reference to the line numbers. The Committee has minimized dependence on the instruction sheet since the forms are frequently reprinted and used without the instructions. The explanation is omitted where the meaning is felt to be obvious.Instrument specifications may be prepared by the use of Automatic Data Processing (ADP) techniques. The format of such specifications may be modified in order to be compatible with ADP machine capabilities. However, general consistency with this Standard shall be retained. Purpose:The purpose of this standard is to promote uniformity in instrument specifications, both in content and form. Because of the complexity of present day instruments and controls it is desirable to have some type of specification form to list pertinent details for use by all interested parties. General use of these forms by users and manufacturers offers many advantages, as listed below:
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