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Why is the 4-20mA Signal Used for Instrumentation Transmission?

Instrumentation /

Introduction In industrial automation and process control, the 4-20mA current loop has become the standard method for transmitting analog signals. It is widely used for measuring and controlling physical parameters such as temperature, pressure, level, and flow. But why has this particular range (4-20mA) been universally adopted over other forms of signal transmission, such as […]

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Optimizing Thermocouple and RTD Performance: A Comprehensive Guide to Selecting Protective Sheaths

Thermocouples /

When selecting a protective sheath for a thermocouple or RTD, it is crucial to consider several key factors to ensure the device’s accuracy, reliability, and longevity in various industrial environments. Here’s a detailed look at the primary selection criteria for thermocouple and RTD protective sheaths: 1. Material Selection The choice of material for the protective

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Top-Mounted Magnetic Level Gauge: Key Applications in Industry

Level meter /

1. Petrochemical Sector Underground Crude Oil Storage Monitoring For large, buried crude oil tanks, top-mounted magnetic level gauges offer real-time level monitoring without compromising tank integrity through ground-level construction. These gauges are built with corrosion-resistant materials to withstand sulfide corrosion in crude oil environments. High-Temperature Reactor Level Control In refinery hydrogenation units, top-mounted designs withstand

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How to Choose Between Light Load and Heavy Load for a Frequency Converter

PLC /

In the process of selecting a frequency converter, the concepts of light load and heavy load are crucial. Proper understanding and distinction between these two load types are essential for choosing the right frequency converter. What is Light Load? In the electrical industry, light load refers to a situation where the electrical control components, under

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General Specifications for Selecting Pressure Transmitters in Industrial Applications

Pressure Transmitter /

Introduction In industrial applications, selecting the right pressure transmitter requires careful consideration of multiple critical specifications and parameters. Choosing the appropriate device ensures accurate measurements, long-term reliability, and compatibility with the operating environment. This article provides a detailed guide on the general specifications and selection criteria for pressure transmitters, along with application scenarios and selection

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How to Choose an Appropriate Flowmeter Based on Fluid Characteristics

Flow meter /

Introduction Flow measurement is a critical aspect of many industries, including oil and gas, chemical processing, and water management. However, selecting the right flowmeter is not straightforward, as different meters react differently to various fluid properties. The physical and chemical characteristics of a fluid can significantly impact the accuracy, efficiency, and longevity of the flowmeter.

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Methods for Oil Tank Calibration and Measurement

Tank /

Oil tank calibration and measurement are crucial processes in the storage, transportation, and sale of petroleum products. Accurate measurement ensures proper inventory control, minimizes losses, and maintains compliance with industry regulations. The measurement methods are generally categorized into static measurement and dynamic measurement. Static measurement is used for stationary oil in storage tanks, whereas dynamic

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What is a PCV Valve and Why is It Important?

Valve /

The Positive Crankcase Ventilation (PCV) valve is a small yet crucial component in an automobile’s engine. It plays a vital role in maintaining engine performance, controlling emissions, and ensuring proper ventilation of the crankcase. Let’s delve into its purpose, working principles, location, common issues, and maintenance requirements. Understanding the Purpose of the PCV Valve During

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A Brief History of Sensor Technology

Sensors /

Sensor technology has made significant advancements since its inception in the early 20th century. Initially, basic mechanical and electrical sensors were primarily used for industrial applications, laying the foundation for future developments. These early sensors were relatively simple, relying on mechanical components to measure variables such as pressure, temperature, and motion. Mid-20th Century: The Introduction

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The Issue of Wiring Systems in Transmitters

Pressure Transmitter /

In the process of selecting and using transmitters, the signal output and wiring method are crucial considerations. The terms “two-wire,” “three-wire,” and “four-wire” refer to transmitters with various direct current (DC) signal outputs. The issue of how many wires a transmitter uses fundamentally stems from differences in working principles and structure, not merely the form

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