When selecting explosion-proof instruments for hazardous areas, many engineers pay close attention to the protection type, such as: Ex d Ex e Ex ia Ex db Ex tb However, one small detail is often overlooked: Why are some explosion-proof markings written with brackets [ ]? For example: Ex db [ia Ga] IIC T4 Gb What […]
Explosion-Proof Marking Explained: What Do the Brackets [ ] Mean in Ex db [ia Ga]? Read More »
Introduction For anyone working in industrial instrumentation and automation, 4-20mA signals are very familiar. Pressure transmitters, temperature sensors, level transmitters, and flow meters have been using this method for decades. Connect two wires, send the current signal back to the analog input module, and the control system can display the measurement value. When a signal
Ethernet-APL vs 4-20mA: Will Ethernet-APL Replace Traditional Analog Signals? Read More »
Radar level transmitters are widely used in oil & gas, chemical, power, pharmaceutical, food, and water treatment industries due to their non-contact measurement capability, high accuracy, and excellent reliability. However, during long-term operation, radar level meters may experience measurement failures caused by installation conditions, process changes, signal interference, or equipment aging. This article explains 10
10 Common Radar Level Transmitter Problems and Troubleshooting Guide Read More »
Introduction When engineers start working with industrial communication, they often encounter many similar terms: Ethernet TCP/IP Socket Modbus TCP EtherNet/IP PROFINET EtherCAT These concepts are frequently mixed together because they are all related to industrial networking. For example, when someone asks: “Does this device support Ethernet communication?” The answer might be: Yes, it supports Modbus
Why Does a Differential Pressure Transmitter Keep Fluctuating? In industrial process measurement, differential pressure (DP) transmitters are widely used for flow, level, and pressure measurement because of their reliability, simple structure, and wide application range. However, unstable DP transmitter output is one of the most frustrating problems faced by instrument engineers. A fluctuating DP signal
DP Transmitter Signal Fluctuation: Causes, Troubleshooting and Solutions Read More »
Introduction In chemical plants, oil & gas facilities, pharmaceutical factories, and other process industries, explosion protection is one of the most important safety considerations. The purpose of dividing hazardous areas and non-hazardous areas is to prevent combustible gases, vapors, or dust from mixing with air and forming an explosive atmosphere. A simple way to understand
A control valve is often considered the “hands and feet” of a process control system. Whether a plant can maintain stable pressure, temperature, flow, or liquid level depends heavily on whether the control valve operates correctly. When a control valve fails, many engineers immediately think about removing and disassembling the valve. However, in most cases,
Control Valve Troubleshooting Guide: Do Not Remove the Valve Before Checking These Steps Read More »
SPD Grounding, Equipotential Bonding and Surge Current Paths Explained When people talk about lightning protection for industrial instruments, many simply think: “Just install a surge protection device (SPD) and connect a grounding wire.” However, engineers who have worked in real industrial plants know that lightning protection is far more complicated than that. Industrial instruments are
Why Do Industrial Instruments Need Lightning Protection and Grounding? Read More »
Introduction A level switch is one of the most commonly used instruments in industrial process control systems. It is mainly used for detecting whether the liquid or solid material level reaches a preset position and then sending a switching signal to control pumps, valves, alarms, or other equipment. Compared with continuous level measurement instruments such
PLC vs DCS: Is PLC Really an Automation System? Understanding the Difference Some engineers believe that process control must use a DCS system, while PLCs should only be used for machine control and cannot be considered a true automation system. This statement sounds reasonable at first glance, but is it really correct? What is the
PLC vs DCS: Is PLC Really an Automation System? Understanding the Difference Read More »
