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Physical, Functional & Performance specifications and certifications, The importance of specifications
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Measuring instrument specifications Basic Practice QA
This Practice test provides the baseline information you need to interpret and explain the specifications provided in product data sheet (PDS). The important questions, Answers with explanations are organized for: The importance of specificationsWhat is instrument specificationsCategories of instrument specificationsCorrectly interpreting specificationsImportance and function of product data sheets (PDSs) and of instrument data sheetsPhysical specificationsWhat is physical specificationsHow physical specifications may impact instrument selection such as: Construction materials (wetted and nonwetted parts)Process/electrical connectionsSize/weightMounting and fill fluid considerations for vacuum serviceFunctional specificationsLearning: What is functional specificationsWhat is span upper range limit (URL), lower range limit (LRL), upper range value (URV), and lower range value (LRV)Rangeability and turndown, Minimum span, Maximum span, Maximum turndownEffects of process and ambient temperature on instrument functionline pressure limit, overpressure limit, proof/burst pressureEnvironmental limit considerationsHow electrical factors may impact instrument selection. Output signal options for two-wire, three-wire, and four-wire transmittersFunction of a failure mode alarmPerformance specificationsLearning: Reference accuracy and reference conditions Zero error, Span error, Total error, Turndown error, Systematic error How following can impact total performance, stability performance, and/or dynamic response performance: Ambient temperature effect Line pressure effect Vibration effect Power supply effect RFI/EMI effect Mounting position effect Load effect Overpressure effect Learning importance of the terms: Linearity Hysteresis Repeatability Importance of stabilityApprovals and certifications Hazardous area Classification, groups and zones IPAL & ATEX, NEMA and IEC enclosure ratings Ignition sources and combustible materials Protection methods Purpose and benefits of an intrinsically safe installation Use references to find material classifications for a given substance Protection and agency codes associated with the instruments IInstallation practices for CENELEC and FM explosion-proof installations NEC guidelines to follow for explosion-proof, intrinsically safe, and sealing applicationsLEARNING OBJECTIVEAfter completing this Practice test, you will be able to use instrument specifications to choose a process measurement solution that is efficient, accurate, and serviceable for the application in which it will be used.
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