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Preventive Measures for Instrument Failures in Chemical Plants

Instrumentation /

1. Instrument Selection and Installation Standards 1.1 Matching Process Conditions Select instrument materials based on medium characteristics such as temperature, pressure, and corrosiveness (e.g., 316L stainless steel, PTFE lining). In explosive environments, use explosion-proof instruments certified by ATEX/IECEx. 1.2 Installation Guidelines Avoid strong electromagnetic interference: keep away from motors and variable-frequency drives; route signal cables […]

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Common Installation Errors in Industrial Instrumentation and Their Prevention

Instrumentation /

Abstract The accuracy and reliability of process measurement systems depend not only on the instrument’s design but also on the quality of its installation. In practice, however, inadequate experience, lack of supervision, or misunderstanding of standards often lead to installation errors. Such mistakes may cause measurement deviations, equipment malfunction, or even safety hazards. This article

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Applications and Significance of Temperature Transmitters

Temperature transmitter /

1. Introduction Temperature is one of the most fundamental and widely measured physical parameters in industrial and daily life processes. Accurate temperature measurement and control are critical for ensuring product quality, improving production efficiency, conserving energy, and guaranteeing safety. Among all types of transmitters, temperature transmitters occupy a leading position in terms of quantity and

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How Differential Pressure Transmitters Measure Flow

Pressure Transmitter /

Differential pressure (DP) transmitters are commonly used for flow measurement in various industrial applications. The principle is rooted in Bernoulli’s equation and the relationship between pressure differentials and flow rates in fluid dynamics. Here, we’ll explore the detailed workings of DP transmitters, the types of primary devices involved, and practical considerations for their use. Principle

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Common Gaskets Used in Chemical Industry

Instrumentation /

1. Introduction Gaskets are essential sealing elements widely applied in chemical plants, pipelines, and pressure vessels. Their performance directly affects the tightness, safety, and reliability of the system. According to the material and construction, gaskets can be divided into non-metallic gaskets, metallic gaskets, and metal composite gaskets. 2. Non-Metallic Gaskets 2.1 Rubber Gaskets Natural Rubber

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Practical Measures for Rainproof and Lightning Protection of Industrial Instruments

Instrumentation /

1. Introduction In chemical and thermal power industries, instrumentation serves as the “eyes” and “brain” of production. It ensures process safety, reliable monitoring, and stable operation. However, during rainy seasons with frequent thunderstorms, instruments are highly vulnerable to moisture ingress, lightning strikes, and electromagnetic interference.This document summarizes practical measures for rainproofing and lightning protection, providing

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Technical Case Study Failure Indication of RF Admittance Level Switch

Level switch /

1. Case Overview Instrument Type: RF Admittance Level Switch Failure Type: Abnormal indication in control room (intermittent alarms, unstable signal). Application: Installed below a pulverized coal bag filter, used for low-level detection of coal powder mixed with inert gas. Objective: To detect coal powder accumulation and trigger timely discharge to storage silo, preventing excessive build-up.

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Step Two of Instrument Management: Periodic Inspection, Calibration, and Preventive Maintenance

Instrumentation /

Introduction After completing the first step of instrument management—establishing a comprehensive and accurate instrument ledger—we hold in hand a precise “map” and “directory” of all devices. However, static data alone cannot ensure reliability. The true value of the ledger lies in transforming this information into systematic actions. The second step of instrument management is to

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Reevaluating Industry Metrics: Advancing PID Tuning and Automation for Optimal Performance

PLC /

Recently, during my service visit to a refining and chemical enterprise in Shandong, I had the opportunity to examine multiple systems where PID tuning had been previously conducted by various companies. It is evident that the industry has made significant advancements in PID tuning practices. However, there remains a considerable gap in the capability to

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Typical Pneumatic Circuit Configurations for Control Valves

Valve /

1. Introduction Control valves are the final control elements in process automation, typically consisting of an actuator, valve body, internal trim, and accessories.Accessories such as positioners, solenoid valves, quick exhaust valves, and air reservoirs are critical in ensuring reliability, safety, and fast response. This document summarizes the key accessories and demonstrates typical pneumatic circuit configurations

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