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How SCADA Collects Data from RTUs: A Field-Proven Guide

PLC /

SCADA talks to RTUs over a wired/wireless link using an agreed protocol (e.g., Modbus, DNP3, IEC 60870-5-104). Tags in SCADA map to RTU registers/points. Data is acquired cyclically (polling) and/or event-driven, then archived, visualized, alarmed, and used for control. 1) Typical Topology Layers: Field sensors & actuators — transmit process values (AI), states (DI), and […]

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Design Considerations for Two-out-of-Three (2oo3) Signal Desynchronization Alarm Logic

Instrumentation /

1. Introduction In modern industrial automation and process control, redundant sensors are widely deployed to enhance system reliability and safety.For critical measurement parameters—such as temperature, pressure, and liquid level—two-out-of-three voting logic (2oo3) is commonly used. This architecture employs three independent sensors measuring the same variable and determines the valid reading when at least two sensors

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Industrial Furnace Temperature Sensors for Real-Time Monitoring at 1200 °C

Thermocouples /

In industrial production, temperature sensors for monitoring furnace temperatures up to 1200 °C are critical for maintaining process stability and ensuring product quality. This article provides a detailed overview from four aspects: sensor types, working principles, key features, and application considerations. 1. Applicable Sensor Types For high-temperature measurement up to 1200 °C, the following types

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Ten Critical Factors for Accurate Pressure Gauge Calibration

Pressure Transmitter /

Reliable gauge calibration isn’t just about applying a reference pressure and writing down numbers. Accuracy class, pressure media, contamination control, elevation head, leak checks, mounting position, how you generate pressure, pre-cycling, gas thermodynamics, and even wrench torque all matter. Get these right and your results will actually reflect reality. 1) Know the Accuracy Class (and

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Level Measurement in High-Temperature Sealed Vessels: A Practical Selection Guide

Level meter /

When vessels run hot and sealed—think reactors, molten salt tanks, or high-temperature oil reservoirs—level measurement must withstand heat, pressure, vapor, and zero-leak requirements. This guide distills practical choices and installation notes to help you select reliably and safely. 1) Non-Contact Radar Level Transmitters (Priority Option) Why it works Non-contact measurement: The antenna does not touch

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Application and Advantages of Radar Level Transmitters in Adipic Acid Mixing Tanks

Level meter /

In environments involving complex chemical reactions and the mixing of various media, such as adipic acid mixing tanks, accurate level monitoring is crucial. In recent years, radar level transmitters have been widely applied to the measurement of levels in adipic acid mixing tanks due to their unique advantages. Adipic acid, as an important chemical raw

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Why Diaphragm-Sealed Pressure Transmitters Fail: Focus on These Three Key Factors

Pressure Transmitter /

1. Introduction In demanding industrial environments—characterized by high temperature, high pressure, strong corrosiveness, or crystallizing media—diaphragm-sealed pressure transmitters act as a critical safety and accuracy barrier. However, many users face performance failures due to subtle but crucial configuration issues, such as: Fill fluid solidifying in cold climates; Excessive capillary length causing slow response; Improper selection

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Radar level meters measuring the liquid level in acid storage tanks

Level meter /

In modern industrial production, the storage and management of liquids are crucial, especially when dealing with corrosive liquids such as acids. Accurate and reliable level measurement is not only essential for production efficiency but also directly impacts safe operations. Radar level meters, with their unique non-contact measurement method, have become an ideal choice for measuring

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Is Intrinsically Safe the Only Choice for Zone 0 Hazardous Areas?

Instrumentation /

When working in hazardous areas, selecting the correct explosion-protection method is critical for safety and compliance. Among these, Zone 0 environments—where explosive atmospheres are present continuously or for long periods—are the most demanding. Many engineers automatically think of intrinsically safe (Ex ia) instruments for Zone 0, but is that the only option? The answer is:

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