Instrumentation

In gas detection and safety-instrumented applications, the choice of signal transmission method is not just a design preference—it directly affects the Safety Integrity Level (SIL) and the overall reliability of the safety protection layer. As fieldbus technologies become more common in process plants, a frequently debated question has emerged: Can a Gas Detection System (GDS) […]

According to GB 50493 (Design Standard for Combustible and Toxic Gas Detection and Alarm Systems) and general industrial safety design practices, GDS detection units must use independent point-to-point wiring when transmitting signals to the alarm controller.Bus (multi-drop shared line) communication is not permitted for safety-critical gas detection functions. The core purpose of a GDS is

In modern industrial automation, digital communication protocols such as Modbus, Profibus, and HART have become increasingly popular. Yet, despite these advances, the 4–20 mA analog signal remains one of the most reliable and widely used methods for transmitting process variables such as pressure, temperature, flow, and gas concentration. From gas detection systems (GDS) to level

1. Documentation and Records Each workshop or unit instrument maintenance team shall establish and maintain the following technical documents and records: 1.1 Instrument equipment master list and digital archive.1.2 Instrument summary list for each process unit.1.3 Instrument maintenance and overhaul operating procedures.1.4 Technical manuals and operation instructions for all installed instruments.1.5 Maintenance, calibration sheets and

Newly manufactured instruments for the chemical industry must undergo certification and calibration before they are put into use. This is crucial for ensuring the accuracy, reliability, and suitability of the instruments under actual working conditions. The need for certification and calibration can be understood in several key aspects: 1. Differences Between Factory Testing and Actual

In Gas Detection Systems (GDS), the stability of the zero-point is essential to ensure accurate measurement and reliable alarm behavior.When the zero point drifts, the detector may trigger a false alarm when there is no gas present, or fail to alarm even when a hazardous concentration exists.This creates potential safety risks in industrial environments. This

When a new industrial plant or production unit is ready for commissioning, the instrumentation system plays a crucial role in ensuring safe startup and stable operation. Any mistakes in installation, wiring, calibration, or control logic may lead to inaccurate measurement, poor control performance, equipment damage, product quality issues, or even safety incidents. This article provides

Introduction The Safety Instrumented System (SIS) serves as the last line of defense for process plants. It continuously monitors critical process parameters and takes automatic action to prevent hazardous events. Proper maintenance and inspection of SIS are crucial to ensure its reliability and to maintain the required Safety Integrity Level (SIL).This article explains the core

Electrical conductivity (EC) is an essential physical parameter used to characterize the ion concentration and soluble inorganic salt content in water solutions. It is widely applied in industrial wastewater treatment, reverse osmosis (RO) and ultrapure water systems, cooling water management, municipal wastewater plant process control, and environmental discharge regulation. Unlike experimental water quality indicators such

Overview Control system inspections are essential for preventing failures and ensuring system reliability. A standardized process should be established across three main aspects: hardware, software, and functionality. 1. Preparation for Inspection Tools and Instruments: Multimeter Signal generator Programming software (e.g., PLC programming software) Calibration instruments (e.g., Fluke 754) Documents: Control system schematics I/O list Inspection