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How to Select the Differential Pressure Transmitter Range Based on Process Conditions

Pressure Transmitter /

When choosing the range for a differential pressure (DP) transmitter, it’s essential to consider both process conditions and the transmitter’s technical specifications. Below is a detailed guide outlining the key steps and considerations for selecting an appropriate DP transmitter range. 1. Determine the Measurement Range Identify the Maximum Range of Pressure Variation: Start by evaluating […]

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Rainy and Thunderstorm Season: Why Do Instruments Frequently “Fail”?

Instrumentation /

Root Causes and Practical Protection Measures 1. Introduction In chemical and process industries, the reliable operation of field instruments is critical to production safety and efficiency. During the rainy and thunderstorm season, instruments are particularly vulnerable to failures caused by moisture ingress, water accumulation, and lightning strikes.This document provides a structured guide to rainproofing and

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Self-Locking, Interlocking, and Mutual Locking in Electrical Circuits

PLC /

1. Introduction In industrial electrical control systems, the concepts of self-locking, interlocking, and mutual locking are fundamental. Although similar in terminology, each has distinct logic, application, and purpose. This document provides a structured comparison of these three control methods, with definitions, working principles, typical applications, and schematic diagrams. 2. Self-Locking (Hold-On Circuit) 2.1 Definition Self-locking

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Key Considerations for Instrumentation Personnel During Plant Start-up and Shutdown

Instrumentation /

1. Introduction Plant start-up and shutdown are routine operations in chemical plants. While short-term shutdowns have limited impact on instrumentation, extended shutdowns—such as those required for major overhauls or unexpected events—demand careful attention from instrumentation engineers and technicians. Improper handling can lead to equipment damage, delayed commissioning, or even safety incidents.This document provides technical guidance

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Understanding the NAMUR NE43 Standard for 4-20mA Signals in Process Control

PLC /

In industrial process automation, the 4-20mA signal is one of the most widely used standards for transmitting analog data from sensors and transmitters to control systems. This signal range, where 4mA typically represents the zero or minimum of a process variable and 20mA represents the maximum, allows control systems to monitor and manage a wide

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Common Faults of Pressure Transmitters: Eight Categories and 24 Solutions

Pressure Transmitter /

1. Introduction Brief role of pressure transmitters in industrial automation. Importance of fault diagnosis and preventive maintenance. 2. No Output from the Transmitter Inspection & Testing (check power polarity, 24VDC supply, display head, loop continuity). Solutions (correct wiring, ensure ≥12V supply, replace faulty display, check loop impedance ≤250Ω). 3. Transmitter Output ≥20 mA Inspection &

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What Is an Instrument Ledger and Why It Matters

Instrumentation /

01. Why Establish an Instrument Ledger? 1.1 Clarify Asset Inventory A well-maintained instrument ledger helps answer three foundational questions: How many instruments are installed in the plant? What are their models and technical parameters? Where are they installed, specifically? Many facilities struggle to provide immediate answers to these questions. A precise ledger serves as a

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Seven Root Causes Behind 99% of Industrial Failures

Instrumentation /

Abstract In modern process industries, most equipment and system failures can be traced back to a limited set of underlying causes. This article summarizes the seven most common factors that affect industrial automation and control systems, explains their impact, and provides recommended countermeasures for engineers and maintenance teams. 1. Measurement Signal Problems Accurate measurement is

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What Is an Instrument Tag Number?

Instrumentation /

Abstract In modern industrial production, automation instruments are key tools for process monitoring, control, and safety assurance. To ensure accurate identification, rational arrangement, and efficient management of numerous instruments, the industry widely adopts instrument tag numbers as a standardized method of identification.This article explains the significance of tag numbers, common compilation rules, international standards, and

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Can a DCS Issue Open/Close Commands to an SIS System for SIF Control of Field Shutdown Valves?

PLC /

In industrial automation and safety-critical systems, ensuring the integrity of Safety Instrumented Systems (SIS) is crucial. The role of SIS in an industrial environment is to mitigate risks and initiate protective actions independently from regular operational control systems, specifically the Distributed Control System (DCS). A common question in this domain is whether a DCS can

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