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Principles for Handling In-Phase Oscillations in Control Systems

PLC /

What Are In-Phase Oscillations? In control systems, an in-phase oscillation occurs when a control loop in automatic mode exhibits regular oscillations. Depending on the nature of these oscillations, they can be categorized into three types: Nonlinear Oscillations: Symptoms: Process variable exhibits square-wave behavior, while the controller output forms a sawtooth pattern. Cause: This is often […]

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Management Guidelines for Graded Control of DCS Alarms

PLC /

Introduction Distributed Control Systems (DCS) are pivotal in managing industrial processes safely and efficiently. Graded alarm control technology ensures that alarms in different zones are independent, using dedicated detectors for each area. This facilitates timely alerts when anomalies occur, drawing operators’ attention and preventing accidents. This document outlines the application, principles, and management strategies for

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Understanding the Need for Electrostatic Grounding in Filters: A Detailed Analysis

Filter /

Electrostatic grounding is a crucial safety measure in the design and operation of many types of filters, particularly in environments where static electricity could potentially cause damage to equipment or lead to hazardous conditions. While not all filters require electrostatic grounding, certain types of filters — especially those involved in sensitive, high-voltage, or explosive environments

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How to Determine Compliance of Measuring and Testing Instruments

Instrumentation /

Ensuring the compliance of measuring and testing instruments is essential for maintaining accuracy, reliability, and legal adherence in various industries. Here’s a detailed guide on how to evaluate the compliance of such instruments: 1. Understand Legal and Regulatory Requirements Compliance starts with understanding the legal framework governing measuring instruments. National Standards and Regulations: Metrological Verification

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HART Protocol: Principles and Applications in Industrial Automation

PLC /

The HART (Highway Addressable Remote Transducer) protocol is a hybrid communication protocol widely used in industrial automation. By combining analog and digital communication, HART facilitates seamless integration of smart devices into traditional control systems. This article delves into the working principles of the HART protocol, its advantages, limitations, and applications across various industries. Principles of

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Application of Tuning Fork Level Switches in Liquid Nitrogen Distribution Systems

Level switch /

Introduction Liquid nitrogen (LN2) is widely used across industries, medical fields, and research laboratories as a cryogenic liquid, stored at extremely low temperatures of around -196°C. Maintaining the stability of liquid nitrogen distribution systems is critical to ensuring their efficiency during vaporization and distribution processes. Tuning fork level switches, known for their high reliability and

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Causes of Negative Pressure in Pipelines and Preventive Measures

Pipeline /

Introduction Negative pressure in pipelines—defined as internal pressure falling below atmospheric pressure—is a common but often underestimated engineering issue.In practical operation, negative pressure can lead to serious consequences, including: Pipeline collapse or deformation Equipment damage caused by excessive suction forces Ingress of air or toxic gases into the system Increased leakage risk and accelerated fatigue

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Common Failure Analysis and Troubleshooting of Orifice Plate Flowmeters

Flow meter /

Orifice plate flowmeters are widely used in industrial flow measurement due to their simple structure and standardized design. However, because the measurement principle is based on differential pressure, their performance is highly sensitive to installation conditions, process parameters, and impulse piping systems. In practical applications, most failures can be classified into two main categories: Abnormal

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Comprehensive Guide to Maintenance Management in the Instrumentation Industry

Instrumentation /

Maintenance management in the instrumentation industry is a specialized field that focuses on ensuring the accuracy, reliability, and functionality of measurement and control devices. Given the critical role of these instruments in sectors like manufacturing, healthcare, energy, and aerospace, a systematic approach to maintenance is essential. This article details the key aspects of maintenance management

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What Happens Without ASME?

Instrumentation /

From Vessel Rupture to Weld Failure and Flange Leakage In real engineering practice, ASME is rarely discussed in philosophical terms.Most engineers encounter it in a much more concrete — and often frustrating — way: Required wall thickness suddenly increases Additional radiographic testing is requested Flange ratings must be reselected Documents are rejected and returned for

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