Introduction In industrial environments where flammable gases or vapors are present, understanding explosion limits—also known as LEL (Lower Explosion Limit) and UEL (Upper Explosion Limit)—is not just a technical concern, it’s a life-saving necessity. One spark, and an entire facility can be at risk. This article will help you understand how to manage explosion risks, […]
In electrical and instrumentation control systems, dry contact and wet contact are two commonly used signal types. These terms describe the way electrical signals are transmitted between devices such as relays, switches, and programmable logic controllers (PLCs). Understanding the differences between these two contact types is essential for designing and troubleshooting control circuits. 1. What
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The selection of calibration gas in the calibration process of flammable gas detectors is a critical factor that directly affects the accuracy of calibration results and the long-term performance of the equipment. This article analyzes the selection of calibration gases, the issue of conversion factors, and related standards. Special attention is given to the feasibility
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A paperless recorder is an essential tool for industries requiring reliable and efficient data recording and monitoring. This guide provides comprehensive instructions on selecting the optimal paperless recorder based on specific requirements. 1. Dimensions and Panel Cutout Sizes Paperless recorders typically come in several standard dimensions: 144×144mm (5.6-inch LCD): Panel cutout 138×138mm 185×156mm (7-inch LCD):
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Steam is commonly measured using mass units such as tons per hour (t/h) or kilograms per hour (kg/h), rather than volume units. This approach provides several advantages, ensuring more accurate measurement and practical application in engineering and commerce. The primary reasons for using mass units for steam measurement are discussed below. 1. The Significant Influence
Introduction Flow measurement is a crucial aspect of various industries, including oil and gas, chemical processing, water treatment, and manufacturing. However, selecting the right flowmeter can be a complex task, as it depends on multiple factors such as pipeline specifications, fluid properties, environmental conditions, and economic considerations. This article provides a comprehensive guide on selecting
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Differential pressure transmitters are categorized into pneumatic and electric types. They are widely used in industries such as refining, chemical processing, and metallurgy. These transmitters are often paired with throttling devices to measure flow, and sometimes are used to measure liquid levels or other parameters. Many differential pressure transmitters operate directly on-site, where most calibrations
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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
Why is the 4-20mA Signal Used for Instrumentation Transmission? Read More »
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
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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