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How to Select the Right Radar Level Transmitter Frequency? Practical Insights from a Field Engineer

Level meter /

1. Introduction Radar level transmitters have become increasingly popular in industrial measurement due to their non-contact nature and adaptability to various conditions. While ultrasonic sensors are also common, radar devices dominate in versatility and reliability across open tanks, sealed vessels, and diverse materials like liquids, slurries, and solids. However, with the market flooded with radar […]

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Tracking Mechanisms in Automatic Control Systems for Bumpless Transfer

PLC /

In automatic control systems, achieving bumpless transfer is crucial. Bumpless transfer refers to the ability to switch between manual and automatic modes without introducing any disturbances into the process. Typically, switching from automatic to manual mode is straightforward. However, switching from manual to automatic mode is more complex and demands careful design. 1. Bumpless Transfer

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Operational Procedures for Draining a Differential Pressure Level Transmitter

Level meter /

Question: Should a differential pressure level transmitter be drained while in operation? Answer: Generally, it is not recommended to drain a differential pressure level transmitter while it is in operation. However, if drainage is necessary, follow the steps below: Disable Automatic Water Level Control: First, disengage the automatic water level control and switch to manual

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Effectiveness of Combining Feedforward and PID Control Strategies in Industrial Applications

PLC /

1. Introduction In industrial process control, disturbances such as sudden changes in input or load conditions can significantly affect system stability. While PID controllers are widely used for maintaining process setpoints, combining them with feedforward control can enhance responsiveness and reduce output fluctuations. This paper discusses how feedforward and PID control can work together, using

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Solving Operational Challenges and Internal Leakage in Large-Diameter Globe Valves

Valve /

1. Why Are Large Globe Valves Difficult to Operate? For globe valves with diameters of DN200 and above, manual operation becomes significantly more difficult due to increased resistance. The average horizontal torque an adult can apply is approximately 60–90 kg, depending on physical strength. Standard globe valves are designed for flow direction from low to

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When Do Interlocks Fail? Root Causes and Engineering Countermeasures

PLC /

Overview Safety Instrumented Systems (SIS) are the final line of defense in chemical and process industries. They protect personnel, equipment, and the environment from hazardous events by automatically transitioning processes into safe states under abnormal conditions such as overpressure, overtemperature, or high level alarms. However, interlocks can fail due to various reasons, often resulting in

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Grounding Standards for Instrumentation in Chemical Plants

Instrumentation /

1. Why Instrument Grounding Matters In chemical production environments, instrumentation systems serve as the “eyes and brain” for monitoring and controlling processes, while grounding systems act as the “lifeline” for operational safety and stability. Improper grounding can result in signal interference, data distortion, or even catastrophic incidents such as fires and explosions. Grounding is essential

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When and Why to Use an Inclined Impulse Line for Pressure/Temperature Instruments

Instrumentation /

In industrial environments, especially those involving dusty, viscous, or condensable media, accurate and reliable measurement of pressure and temperature requires more than just selecting the right sensor. The design and installation orientation of the impulse line (short tapping pipe or stub) plays a critical role in ensuring consistent readings and preventing blockage or drift. One

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Maintenance Guidelines for Pressure Switches

Pressure Transmitter /

1. Pre-Operation Preparation and Safety Confirmation 1.1 Communication & Work Permits Coordinate with process personnel to confirm that pressure switch removal will not trigger system interlocks, shutdowns, or abnormal process conditions. Ensure control systems are in “manual” mode or interlocks are bypassed. Obtain necessary work permits such as: Equipment Maintenance Permit Hot Work Permit (if

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Precautions for Pressure Gauge Maintenance and Inspection

Pressure Transmitter /

Pressure gauges are critical instruments for monitoring pressure in various industrial systems. To ensure measurement accuracy, personnel safety, and equipment reliability, it is essential to follow standardized procedures during maintenance and inspection. This guide outlines key precautions and best practices. 1. Safety Preparation 🔌 Power Isolation and Pressure Release Disconnect power supply to related equipment

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