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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 […]

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

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 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