The drop type liquid level gauge is a sensor used to measure the height of liquid, especially suitable for various liquid storage tanks, rivers, reservoirs and other occasions. It determines the level height by measuring the static pressure of the liquid.
The detailed explanation of the working principle
1. Core components
• Pressure sensor: detect the static pressure P=pgh generated by the liquid, and convert the pressure signal into an electrical signal.
• Signal processor: Converts the electrical signal output by the sensor into a standard output signal (such as 4-20mA, 0-10V).
• Ventilation cable: Balance the internal pressure of the gauge with the atmospheric pressure.
2. Pressure range design
The measuring range of the submersible level gauge is determined by the pressure measuring range of the sensor, so it is necessary to select a level gauge suitable for the specific liquid depth.
3. Temperature compensation
Part of the input level meter integrates a temperature sensor, which can compensate the change of liquid density caused by temperature change and improve the measurement accuracy.
The use of occasions
1. Industrial water treatment
It is used in sewage treatment plants and water plants for liquid level measurement of clear pools and sumps.
2. Petrochemical industry
For liquid crude oil, chemical solvent storage tank level monitoring.
3. Groundwater and environmental monitoring
It can be used in groundwater level monitoring Wells, reservoir water level changes, river flood warning and other scenarios.
4. Food and beverage industry
Sanitary input level gauges can be used in milk, beverage and beer storage tanks.
Advantages and Disadvantages
Advantage
1. Simple structure: no moving parts, low failure rate, low maintenance cost.
2. Strong durability: Modern input level gauges can be made of stainless steel or special alloy materials, and can withstand high pressure and a variety of chemical media.
3. High level of protection: many devices reach IP68 level and can be immersed in water for a long time.
Disadvantages
1. Environmental sensitivity
• Atmospheric pressure changes: Although the snorkel balances the pressure, accuracy can be affected if it is blocked or poorly sealed.
• Temperature impact: Extreme temperature conditions may affect sensor stability.
2. High maintenance requirements
It is easily affected by silt and impurities in dirty liquids and needs to be cleaned regularly.
Installation and maintenance precautions (detailed explanation)
Installation procedure
1. Location selection
Avoid stirrers or places where the flow is intense, and choose an area where the liquid flows steadily.
2. Fixing method
• Use guide tubes in deep Wells or large containers to avoid sensor drift.
• Use a hook, bracket, or dedicated mounting to secure the level gauge.
3. Protect the ventilation cable
• Prevent ventilation cables from being broken or damaged.
• Ensure that air holes are unblocked to prevent dust and water vapor from entering.
4. Cable connection
• When connected to a standard signal transmitter, check the power supply polarity to prevent damage to the instrument.
• Use shielded cables to avoid electromagnetic interference.
Maintenance suggestion
1. Regular calibration
The liquid level gauge should be calibrated regularly to prevent sensor drift from causing errors.
2. Anti-clogging measures
For environments that are prone to deposition of impurities, you should consider adding a filter cover or cleaning it regularly.
3. Check the cable integrity
Ensure tightness to prevent water vapor from entering and damaging internal components.
Typical application cases
• Reservoir dam monitoring: The submersible level meter can be used in the reservoir's automatic water level monitoring system to provide real-time water level data for flood warning and storage management.
• Industrial tank level control: For oil storage tanks in the petrochemical industry, combined with control systems to achieve level alarm and automatic control.
Through the above explanation, you can have a more comprehensive understanding of the application and maintenance of the input level meter.
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