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The connection schemes between PLCs (Programmable Logic Controllers) and various types of transmitters

PLC /

These transmitters include pressure transmitters, level transmitters, temperature transmitters, differential pressure transmitters, humidity transmitters, and soil moisture transmitters, among others. The usage of these transmitters is becoming increasingly widespread in industrial applications. Types of Transmitter Power and Signal Outputs Transmitters typically use two main power supply configurations: Two-wire system: Where both power and signal transmission […]

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What is MCC? A Comprehensive Guide to Motor Control Centers

Instrumentation /

Introduction In modern industrial automation, managing multiple electric motors efficiently and safely is a significant challenge. A Motor Control Center (MCC) is a crucial solution designed to centralize and streamline motor management. Widely used in industries such as oil & gas, metallurgy, mining, water treatment, and power generation, MCCs play an essential role in motor

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Characteristics and Redundancy Configuration of Safety Instrumented Systems in Chemical Plants

PLC /

1. Introduction Chemical plants deal with hazardous materials, including flammable, explosive, toxic, and corrosive substances. This makes safety a top priority in these facilities. One of the key safety measures in place is the Safety Instrumented System (SIS), which is designed to prevent or mitigate hazardous events by taking automatic protective actions. A well-designed SIS

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Oil Temperature Control of Refrigeration Units: Challenges and Solutions Using Advanced Control

PLC /

In refrigeration systems, maintaining optimal oil temperature is crucial for ensuring the smooth operation of compressors and other critical components. Traditionally, oil temperature control has been manually managed using two air-cooled variable frequency drives (VFDs), but implementing automatic oil temperature control in a Distributed Control System (DCS) has presented several challenges. These challenges include measurement

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What is MES (Manufacturing Execution System)?

Instrumentation /

A Manufacturing Execution System (MES) is a crucial production management system designed for manufacturing enterprises. It connects the enterprise’s planning layer (ERP) with the on-site control layer (PLC, SCADA, etc.), enabling real-time monitoring of production processes, data collection, quality management, and process execution. The main goal is to improve production efficiency, product quality, and responsiveness.

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Precautions for Instrument Operations During Plant Startup and Shutdown

Instrumentation /

In chemical production, startups and shutdowns are routine but critical operations. Short-term shutdowns generally have minimal impact on instruments, with limited adjustments needed by instrumentation personnel. However, this document focuses on large-scale shutdowns and startups, such as those due to major overhauls, extensive stoppages, or events requiring prolonged halts and subsequent restarts of operations. Note

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Common Thread Types in Japanese Industrial Standards (JIS)

Instrumentation /

Introduction Japanese Industrial Standards (JIS) define various thread types for different industrial applications. These threads are widely used in mechanical components, piping systems, and precision instruments. This article provides an overview of the most common JIS thread types, their characteristics, applications, and examples. 1. JIS Parallel Pipe Thread (JIS B 0202) Designation: PF (Equivalent to

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Analysis of Factors Affecting Ultrasonic Liquid Level Meter Accuracy

Level meter /

1. Environmental Factors Temperature Variation The propagation speed of ultrasonic waves directly relates to temperature, following the equation , where is temperature in degrees Celsius. Extreme or rapidly changing temperatures can result in inaccuracies due to inadequate sound speed compensation. For operational environments ranging from -40℃ to 85℃, it is recommended to select industrial-grade sensors

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Handling and Emergency Measures for Oil Contamination in Steam Systems Caused by Incorrect Welding of Instrument Heat Tracing Pipes

Instrumentation /

1. Incident Overview In chemical production or other industrial scenarios involving instrument heat tracing and steam systems, errors during the welding of heat tracing pipes can lead to severe issues. For example, heat tracing pipes may be mistakenly connected to oil system pipelines in the steam system or accidentally linked to isolated oil systems during

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Determining the Installation Height of Combustible and Toxic Gas Detectors

Instrumentation /

The installation height of combustible and toxic gas detectors is a critical factor in ensuring the safety and effectiveness of gas detection systems. Proper installation height depends on the physical properties of the gas, the characteristics of the detection environment, and the location of potential gas release points. Below is a detailed guide on determining

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