Liquid Level Relay for Precise Industrial Control Systems | Huilong

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Liquid Level Relay: Automatic Control Device for Liquid Level Systems

Liquid Level Relay: Automatic Control Device for Liquid Level Systems

The liquid level relay controls circuit on/off based on liquid level (high/low), commonly used in liquid level control systems (e.g., water tanks, oil tanks, and chemical storage tanks). By detecting liquid level changes through sensors, it triggers pump start/stop or alarm functions to maintain liquid levels within set ranges. This relay ensures stable operation of liquid storage and transportation systems, preventing overflow or dry running and playing a key role in industrial water treatment, chemical engineering, and agricultural irrigation.
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Advantages

Precise Level Sensing Accuracy

Detects liquid levels with ±2mm precision, ensuring stable liquid level control in water tanks, boilers, and chemical reactors.

Anti-Foam and Vibration Filtering

Advanced algorithms ignore false signals from liquid turbulence or foam, ensuring reliable operation in agitated tanks.

Corrosion-Resistant Probes

Probes made of 316L stainless steel or PTFE, suitable for aggressive liquids (acid, alkali, saltwater) in chemical and pharmaceutical industries.

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Liquid level control relays integrate hysteresis and sensor float/capacitance/ultrasonic. It can also have multi-output modes of SPDT and DPDT with adjustable hysteresis from 1-5%(range). They are compliant with IEC 61010-1 standards, and in controlling HVAC and water treatment plants, they maintain safe boiler levels with ASME standards with the powering off preventing overflow.

Frequently Asked Questions

How accurate is a liquid level relay in detecting levels?

A liquid level relay detects liquid levels with ±2mm precision, ensuring stable control in water tanks, boilers, and chemical reactors. This high accuracy prevents overflow or dry running, critical for maintaining process stability in industrial liquid systems.
The liquid level relay supports single-point (high/low level) and continuous level control, adapting to simple alarms or complex pump start/stop sequences. This versatility makes it suitable for both basic and advanced liquid management applications.
Advanced anti-foam and vibration filtering algorithms ignore false signals from liquid turbulence or foam, ensuring reliable operation in agitated tanks. This prevents misinterpretation of level signals caused by splashing or bubbling liquids.
The liquid level relay features probes made of 316L stainless steel or PTFE, suitable for aggressive liquids like acids, alkalis, or saltwater in chemical and pharmaceutical industries. These materials resist corrosion, ensuring long probe life in harsh environments.
No, the liquid level relay has an auto-calibration function that automatically adapts to different liquid conductivities. This reduces manual calibration needs, improving installation efficiency and minimizing setup errors across various liquid types.
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Customer Reviews

Zhang Wei
Accurate Level Control for Water Tanks

"Controlling our factory's 10,000L water tank, this relay maintains levels within ±2mm, preventing overflow and dry running. The auto-calibration adapted to our hard water instantly, and the anti-foam algorithm ignores water turbulence from the inlet pipe. The 4-20mA output integrates smoothly with our SCADA system—excellent for remote monitoring."

Dr. Li Wei
Corrosion-Resistant for Chemical Tanks

"Used in our acid storage tanks, the PTFE probes on this relay haven't degraded after 2 years of contact with sulfuric acid. The dual-level control (high alarm and low pump start) works reliably, and the explosion-proof certification gives us peace of mind in our hazardous environment. A must-have for chemical processing."

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Auto-Calibration Function

Auto-Calibration Function

Automatically adapts to different liquid conductivities, reducing manual calibration needs and improving installation efficiency.
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