Bài giảng Thiết kế P&ID: Chương 6 - TS. Nguyễn Thành Duy Quang

This chapter on Instrument Systems within P&ID Design underscores the pivotal role of accurate process measurements in ensuring efficient and safe industrial operations. Effective process automation and control hinge upon a thorough understanding of instrumentation principles. This section introduces the fundamental concepts of instrument systems, elaborating on their components and the critical considerations for sensor selection. By establishing a robust foundation in these areas, it aims to equip readers with the knowledge necessary to interpret and design Piping and Instrumentation Diagrams effectively, bridging theoretical principles with practical application in process industries.

Engineering students, process control engineers, instrumentation technicians, and professionals involved in P&ID design or industrial automation.

This academic manuscript delves into the intricate world of Instrument Systems, a cornerstone of effective P&ID Design and process automation. It systematically outlines the role of process measurements, categorizing them into continuous and discrete types, and elucidates the essential components of a measurement system, specifically focusing on primary elements (sensors) and transmitters. A significant portion is dedicated to the critical characteristics considered when selecting a sensor, such as range, span, rangeability, accuracy, precision, and bias, alongside practical factors including cost, reliability, materials, and physical access. The discussion extends to fluid flow principles, introducing the Reynolds number to differentiate between laminar and turbulent flow regimes, which directly impacts measurement strategies. Furthermore, the document provides a detailed analysis of differential-pressure type flow sensors, highlighting their advantages like versatility and lack of moving parts, while also addressing inherent disadvantages such as limited rangeability and the complexity of installation and maintenance due to additional components like manifold valves. This comprehensive overview offers valuable insights for designing, implementing, and maintaining robust control systems in industrial environments, emphasizing the practical implications of instrument choice.