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Common Causes of Level Gauge Reading Fluctuations and Solutions

Level meter /

Level gauges are widely used in industrial automation to measure liquid levels in tanks and vessels. In many industries, the accuracy of level measurement directly affects production efficiency, process stability, and safety. However, in real applications, level gauge readings sometimes fluctuate, which may result in inaccurate control, equipment malfunction, or even safety hazards.This document summarizes […]

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Two-Wire, Three-Wire, and Four-Wire Systems in Process Instrumentation

Instrumentation /

1. Introduction Process instrumentation in the chemical industry relies heavily on signal transmission and power supply methods. The wiring configuration of transmitters and sensors—whether two-wire, three-wire, or four-wire—directly affects installation complexity, cost, measurement accuracy, and reliability. This article explains the principles, advantages, limitations, and typical applications of each wiring system, providing a comparative overview for

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Installation Technical Specification for Variable Area Flowmeters (Rotameters)

Flow meter /

1. Core Installation Principles 1.1 Flow Direction and Vertical Alignment The rotameter must be installed vertically, with fluid flowing from bottom to top through the tapered tube. The deviation from the vertical axis should be less than 2°. For special horizontally-installed models, ensure the measuring tube remains level, with full pipe conditions. Horizontal deviation should

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Understanding Pressure Loss in Piping Systems: Causes, Effects, and Engineering Considerations

Pressure /

Pressure loss—also known as pressure drop or head loss—is a critical concept in fluid engineering. It refers to the reduction in pressure as a fluid flows through a pipe, valve, fitting, or any other component in a system. Understanding and managing pressure loss is essential for the efficient and safe operation of pipelines, pumps, and

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Why Should Pneumatic Valves Be Equipped with an Air Reservoir?

Valve /

1. Background In many field applications, pneumatic valves are installed with an auxiliary air reservoir (air tank), commonly referred to as a “gas bag.” However, feedback shows that operators often connect it incorrectly or even leave it unused, which compromises its intended function. The air reservoir plays a crucial role: under normal conditions it remains

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Integrating SIS and CCS in Chemical Plant Operations: Challenges and Considerations

PLC /

In the realm of chemical plant operations, the discussion about integrating Safety Instrumented Systems (SIS) with Central Control Systems (CCS) has gained attention. These two systems serve critical but distinct roles, and while integrating them might seem efficient, it poses significant technical and safety challenges. This article delves into the differences between SIS and CCS,

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Pressure Sensor/Transmitter Load Characteristics — An Engineer’s Guide

Pressure Transmitter /

Audience: Instrumentation engineers, system integrators, maintenance personnel Scope: Practical definition, sizing formulas, wiring topologies, worked examples, and checklists for 4–20 mA and 0–10 V outputs. 1) Why “load characteristics” matter Load characteristics (a.k.a. loading effect) describe how the measurement chain—sensor/transmitter, wiring, intrinsic‑safety devices, and receiving instruments—influences the signal. Any loading that steals compliance voltage or

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Classification of Pressure Sensors by Functional Application

Pressure Transmitter /

Pressure sensors, also known as pressure transducers, are devices that detect pressure changes in gases or liquids and convert these changes into standardized electrical signals. Based on their functional characteristics and application environments, pressure sensors can be categorized into several specialized types: 1. High-Temperature Pressure Sensors These sensors are designed to operate reliably in elevated

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Maintenance Guide for Electromagnetic Flowmeters

Flow meter /

Electromagnetic flowmeters are widely used in industrial processes for their accuracy, stability, and ability to measure conductive fluids. However, like all precision instruments, proper maintenance is essential to ensure long-term performance and reliability. This article outlines key maintenance tasks for electromagnetic flowmeters, including electrode cleaning, anti-corrosion care, routine inspection, and recalibration. 1. Electrode and Liner

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