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Installation Guidelines for Explosion-Proof Flexible Conduits: Key Considerations and Best Practices

Instrumentation /

Explosion-proof flexible conduits, also known as explosion-proof flexible metal hoses, play a crucial role in hazardous areas where flammable gases, vapors, or combustible dusts are present. These conduits are designed to protect electrical cables and maintain the integrity of explosion-proof enclosures. Proper installation is essential to ensure system safety, durability, and compliance with explosion-proof standards. […]

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Comprehensive Guide to Instrumentation Cable Selection in Chemical Plants

Instrumentation /

1. Key Selection Criteria and Technical Rationale 1.1 Cable Type Selection Shielding Configuration Analog Signals (AI/AO): Use double shielding (individual + overall shield). Reason: Analog signals are highly susceptible to electromagnetic interference (EMI). Double shielding effectively isolates external noise and ensures signal accuracy. Digital Signals (DI/DO): Use single shielding in general environments; double shielding in

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Tank Level Alarm Settings: Standards and Requirements

Tank /

Effective liquid level monitoring is critical in ensuring the safety and operational efficiency of storage tanks across industries, including petroleum, chemical, and water storage. To achieve this, storage tanks are equipped with high and low-level alarms to notify operators of any potentially dangerous liquid levels. This article outlines the key standards and specific requirements for

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Practical EMC Engineering: Lessons Learned from Grounding in the Field

Instrumentation /

Introduction Electromagnetic Compatibility (EMC) is a critical aspect in the design and commissioning of electronic equipment. From industrial automation systems to household appliances and high-tech electronics, EMC issues can affect device performance, safety, and longevity. As the electromagnetic environment becomes increasingly complex, effective EMC design and interference troubleshooting have become essential skills for engineers. This

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Practical Guide: How to Solve Inconsistencies Between Field Differential Pressure Transmitters and DCS Square Root Settings Using TREX

Instrumentation /

Background In chemical plants and other process industries, it is common to encounter discrepancies between the output of field-mounted differential pressure (DP) transmitters and the values displayed or processed in the Distributed Control System (DCS). One of the most frequent causes is the inconsistent application of square root extraction (SQRT)—a method used to linearize flow

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Are There Unified Standards for Periodic Inspection of Storage Tanks?

Tank /

Storage tanks play a critical role in industries such as petrochemicals, energy, water treatment, and chemical manufacturing. However, incidents involving tank leakage, corrosion, or structural failure are not uncommon, often due to lapses in safety management or delayed inspections. This raises a fundamental question: Is there a unified standard for the periodic inspection of storage

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Building a Safety Instrumentation Failure Database: From Compliance to Core Safety Asset

Instrumentation /

1. Introduction: A Critical but Elusive Need Everyone agrees: petrochemical enterprises must build a safety instrumentation failure database. But how exactly should it be done? Few have answers. Some industry experts stress the need for such a database during inspections, yet offer no actionable path forward. Meanwhile, frontline workers hold piles of failure records without

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Understanding Conductivity and Its Measurement Principles

Flow meter /

Conductivity is a crucial property that describes a material’s ability to conduct an electric current, particularly in liquid solutions. It is an essential parameter in many scientific and industrial applications, including water quality testing, chemical analysis, and industrial wastewater management. Conductivity is typically measured in Siemens per meter (S/m), but depending on the context, microsiemens

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Understanding Zero Suppression and Elevation in Pressure Transmitters

Pressure Transmitter /

In the field of industrial instrumentation, pressure transmitters often require adjustments to their measurement range, especially when installed in varying physical positions relative to the pressure tapping point. This process is known as zero migration, which includes zero elevation, zero suppression, and no migration. Understanding and properly adjusting for these conditions is essential to ensure

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What is the voltage between the positive terminal of a 24V DC instrument and ground? What about the negative terminal? Why is it like this? What happens if the negative terminal is grounded? What happens if the positive terminal is grounded?

Instrumentation /

In a 24V DC power system, if neither terminal is connected to ground (i.e., the system is floating), the voltage between each terminal and ground is undefined and may fluctuate. However, once the power supply is connected to an instrument, the reference potential stabilizes, and this typically has no negative effect on instrument operation. When

What is the voltage between the positive terminal of a 24V DC instrument and ground? What about the negative terminal? Why is it like this? What happens if the negative terminal is grounded? What happens if the positive terminal is grounded? Read More »

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