Introduction: The Challenges of Liquid Level Monitoring in Harsh Operating Conditions
Construction machinery, such as excavators, cranes, and loaders, often operates in extreme environments characterized by high vibration, high impact, large temperature differences,
and high dust levels. Their hydraulic systems act as the "circulatory system" of the equipment, making the hydraulic oil level crucial. Low levels can lead to pump cavitation, system
overheating, and even damage to core components, resulting in significant maintenance costs and time losses. Traditional contact sensors are prone to failure under strong vibrations,
while mechanical level gauges pose a risk of leakage. Capacitive non-contact level sensors, with their robust structure and operating principles, have become an ideal solution to this problem.
Special Requirements for Liquid Level Detection in Construction Machinery
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Extremely strong vibration and shock resistance: Continuous vibrations and impacts generated during equipment operation can easily cause internal components of the sensor to loosen or become damaged.
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Wide operating temperature range: From the frigid north to the scorching deserts, the sensor needs to operate stably within a range of -40℃ to +125℃ or even wider.
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High Protection Rating (IP6K9K): Must withstand high-pressure water jet washing and dust intrusion, adapting to dusty and muddy construction site environments.
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High Reliability: Long maintenance cycles require extremely low sensor failure rates to ensure equipment uptime.
Advantages of Capacitive Level Sensors:
1.
No Moving Parts, Inherently Vibration-Resistant: All-solid-state design, with no floats, springs, or other moving parts, fundamentally eliminates the possibility of mechanical fatigue or malfunction due to vibration.
2.
Wide Temperature Range Operation: Utilizes high-performance electronic components and a wide temperature range design, easily handling the extreme temperature conditions of construction machinery.
3.
Easy Installation, No Leakage Risk: The sensor is installed on the outside of the oil tank, eliminating the need for drilling holes in the pressure tank and completely
preventing oil leakage points caused by sensor installation.
4.
Stable Signal: Advanced signal processing technology effectively suppresses complex electromagnetic interference generated by engine operation, etc.
Application Scenarios
• Hydraulic Oil Tank Level Monitoring: Real-time monitoring of oil level, alarming when the level is low to prevent damage from dry running of the hydraulic pump.
• Fuel Tank Level Monitoring: Accurately monitors remaining fuel level and integrates with the fuel management system.
• Engine Oil Level Monitoring: Assists in monitoring oil consumption.
Selection Recommendations: When selecting a model, be sure to confirm: wide temperature range (-40℃~125℃+), high protection rating (IP67/IP69K),
vibration resistance (e.g., conforming to ISO 16750-3 standard), and suitability for both metal and non-metal fuel tanks.
