1) Why this matters Being able to read a cabinet and a cable schedule at a glance speeds up commissioning and reduces wiring mistakes that lead to nuisance trips or silent failures. This guide summarizes field-proven rules for AI/AO/DI/DO wiring, shows how to choose between NO/NC contacts under the fail-safe principle, and explains how to […]
Introduction With the continuous advancement of industrial technology, hydrogen has become an important industrial gas widely used in power generation, chemical processing, electronics manufacturing, and other sectors. In these applications, accurate measurement of hydrogen humidity is essential for ensuring process safety and improving product quality. A hydrogen gas humidity meter is a specialized instrument designed
Calibration and Verification of Hydrogen Gas Humidity Meters Read More »
Stainless steels are indispensable in various industrial applications due to their corrosion resistance, durability, and strength. Among them, 304 and 321 stainless steel are both part of the austenitic family and often used in similar environments—but they are not interchangeable. This article compares the chemical composition, temperature resistance, mechanical properties, and applications of 304 vs.
What’s the Difference Between 304 and 321 Stainless Steel? Read More »
1. Background: Persistent Diaphragm Failures in DCS Level Transmitters In a 450,000 tons/year polypropylene (PP) production plant using LyondellBasell’s gas-phase process, frequent failures occurred in level transmitters installed on Reactor #3 during the production of impact-resistant polypropylene. These failures were specific to the DCS-linked level transmitters, which required diaphragm replacement nearly every month, while a
Reviewing a chemical process design package is a crucial step in ensuring that the planned process meets engineering, safety, and operational standards. This detailed examination helps to prevent costly errors, maximize efficiency, and safeguard personnel and the environment. Here are the primary aspects that should be considered during the review of a chemical process design
Key Points for Reviewing a Chemical Process Design Package Read More »
Programmable Logic Controllers (PLCs) are at the heart of industrial automation, controlling processes from simple on/off operations to complex, multi-axis systems. Understanding how PLCs are classified, their functional tiers, software architecture, memory types, and advanced I/O capabilities is essential for selecting the right solution for your application. 1. PLC Classification by I/O Capacity PLCs can
Understanding PLC Classifications, Functions, Software, and Smart I/O Modules Read More »
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
How SCADA Collects Data from RTUs: A Field-Proven Guide Read More »
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
Design Considerations for Two-out-of-Three (2oo3) Signal Desynchronization Alarm Logic Read More »
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
Industrial Furnace Temperature Sensors for Real-Time Monitoring at 1200 °C Read More »
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
Ten Critical Factors for Accurate Pressure Gauge Calibration Read More »
