Instrumentation

Abstract The immersion depth of industrial temperature sensors such as thermocouples, resistance temperature detectors (RTDs), and bimetallic thermometers directly affects the accuracy and reliability of measurement. Despite clear guidelines in standards such as SH/T 3005-2016, inconsistent practices are often observed in engineering applications. This article summarizes the principles of thermometer immersion depth, analyzes common misconceptions, […]

In industrial projects such as boilers, pressure vessels, and chemical processing equipment, the same material grade may be specified in different product forms (pipes, fittings, forgings, castings, and plates). To ensure consistency in design and procurement, engineers often need to cross-reference material standards. The following table provides an equivalency overview for commonly used American standards.

Abstract This case study describes a packaging system failure in a polyacrylamide production line, triggered by an accidental disconnection of a weighing sensor during routine cleaning. The incident highlights the importance of preventive maintenance and operational discipline in industrial environments. Root cause analysis, corrective actions, and preventive measures are discussed to provide guidance for similar

Abstract Real-Time Optimization (RTO), Advanced Process Control (APC), and Self-Optimizing Control (SOC) are complementary approaches in hierarchical control structures. While RTO aims to deliver economically optimal setpoints, APC translates them into feasible tactical targets, and PID controllers execute the actions. This paper reviews their interrelationship, practical boundaries, and economic feasibility, with examples from process industries.

Abstract Water hammer (hydraulic shock) is a common yet often underestimated phenomenon in both industrial and municipal fluid systems. It can cause serious damage, including instrument failure, flange deformation, and pipeline rupture. This article explains the principles, mechanisms, case studies, international standards, engineering protection strategies, and future development directions for water hammer prevention and control.

Abstract Instrument lifecycle management is a systematic and digitalized approach that treats the entire process of an instrument—from design to disposal—as one integrated chain. By connecting data and ensuring collaborative management across each stage, organizations can achieve safety, reliability, cost efficiency, and regulatory compliance. 1. Lifecycle Stages of Industrial Instruments 1.1 Design & Selection Requirement

1. General Provisions PurposeThis system is established to ensure the long-term, stable, safe, and efficient operation of instrumentation equipment. By preventing unexpected failures, minimizing unplanned downtime, reducing maintenance costs, and extending equipment service life, it safeguards production continuity and process safety. Scope of ApplicationApplicable to all in-service instrumentation equipment within the company, including but not

1. Instrumentation Power Supply 1.1 Power Supply Provision Independent Power Setup: Critical instruments or instrumentation systems are equipped with dedicated uninterruptible power supplies (UPS). This ensures continuous power during unexpected outages in the main power grid, safeguarding data integrity and preventing equipment shutdown. For instance, essential monitoring instruments in production processes are supported by UPS

Introduction In mineral processing plants, flotation tanks are large vessels where slurry and froth separation takes place. At first glance, the control of liquid level in such large tanks seems to require long filling times and correspondingly large PID integral times. However, this intuitive assumption may lead to incorrect parameter settings. This document presents a

Abstract Power dips (voltage sags) are common disturbances in industrial power grids. If not handled properly, they may cause equipment trips, process interruptions, or even secondary accidents such as material leakage or equipment damage. This document provides technical guidance on how to ensure orderly equipment operation during power dips through PLC/DCS program optimization and emergency