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What is a liquid level gauge？

2025-05-26

Introduction to Liquid Level Gauges

A liquid level gauge, also known as a liquid level sensor or meter, is a device designed to measure the height or volume of liquids in various containers or environments.

It plays a critical role in industries ranging from water management to industrial processes by providing real-time data for monitoring, control, and safety purposes. Among the diverse types of liquid level gauges, the submersible liquid level transmitter stands out for its ability to operate directly in liquid environments, offering accuracy and reliability even in harsh conditions.

Types of Liquid Level Gauges

1. Tipping Bucket Rain Gauge Sensor

A tipping bucket rain gauge sensor is a type of rain measurement instrument that detects and records the amount of rainfall. It uses a mechanical system to measure rainfall and provides a digital or analog output for further analysis. The sensor consists of a bucket that tips once it collects a predefined amount of rain, sending a signal each time it tips.

Applications: Weather monitoring and forecasting, flood prediction and management, agriculture and irrigation management, environmental monitoring, hydrological and engineering studies, etc;

Advantages: The tipping bucket rain gauge sensor is a cost-effective, reliable, and precise tool for monitoring precipitation in various applications, offering advantages such as real-time data collection, low maintenance, and ease of integration with existing systems.

2. Ultrasonic Liquid Level Gauge

These gauges use ultrasonic waves to measure the distance from the sensor to the surface of the liquid. The time it takes for the ultrasonic signal to bounce back from the surface of the liquid is used to calculate the liquid level.

Applications: Ideal for large tanks, containers, and inaccessible locations.

Advantages: Non-contact measurement, highly accurate, and suitable for a variety of liquid types.

3. Capacitive Rain Gauge Sensor

A Capacitive Rain Gauge Sensor is a type of rain sensor that measures rainfall by detecting changes in capacitance caused by the accumulation of water.

Applications: Used for detecting low levels in containers, often in automated systems.

Advantages: High precision and can be used in harsh environments.

4. Radar Liquid Level Gauge

A radar liquid level gauge is an instrument used to measure the level of liquid in a tank or vessel without physical contact. It operates using radar waves to determine the distance between the sensor and the surface of the liquid.

Applications: Used in industries such as oil and gas, chemical processing, and power generation.

Advantages: Suitable for high-pressure, high-temperature, and hazardous environments.

5. Float Type Liquid Level Gauge

The float level gauge uses a float, which rises and falls with the liquid level. The float is usually attached to a mechanical arm that moves according to the height of the liquid, providing visual or mechanical level indication.

Applications: Used in tanks, reservoirs, and vessels with clear access to the liquid surface.

Advantages: Simple, cost-effective, and reliable.

Product Introduction: RKL-01 Submersible Liquid Level Transmitter

The RKL-01 Submersible Liquid Level Transmitter is a high-precision water level sensor engineered for submersible applications.

At its core is a stainless steel isolation diaphragm with a diffusion silicon pressure core body, ensuring durability and resistance to corrosion. The pressure core body undergoes laser trimming resistor technology, providing wide-temperature compensation for both zero-point and sensitivity, which guarantees stable performance across varying thermal conditions (-40°C to +80°C operating temperature, with compensation from -10°C to 70°C).

▪ Key technical specifications include:

- Measuring Range: 0–0.5m to 200m H₂O or 0–5kPa to 2MPa, catering to diverse depth requirements.

- Output Options: 4–20mA, 0–5V, 0–10V, and RS485, enabling compatibility with different monitoring systems.

- Power Supply: 10–30VDC (24V typical), ensuring flexibility in power sources.

- Accuracy: Total accuracy ranges from 0.1%FS to 0.5%FS, with long-term stability of 0.1%FS/year (typical) and 0.2%FS/year (maximum), making it suitable for precision-critical applications.

- Ingress Protection: IP68 full waterproofing, allowing prolonged submersion without damage.

- Material: The sensor uses 316L stainless steel, while the housing is 304SS (316L optional).

- Cable: A PUR atmospheric pressure compensation cable with a polymer waterproof plug ensures airtight sealing and pressure balance, critical for accurate measurements.

The transmitter also features fast response times, strong interference resistance, and a wide temperature compensation range, making it reliable in dynamic and challenging settings.

▪ Distinctions from Other Liquid Level Gauges

The RKL-01 submersible water level sensor is versatile, fitting into multiple sectors:

- Environmental Monitoring: Groundwater level tracking in wells, river flow management, and reservoir monitoring to support flood control and water resource planning.

- Wastewater and Sewage Systems: Monitoring liquid levels in urban sewage networks and wastewater treatment plants to optimize flow and prevent overflows. - Agriculture: Irrigation systems rely on the RKL-01 to measure water levels in ponds or tanks, ensuring efficient water usage and crop sustainability.

- Industrial Processes: Monitoring liquids in chemical tanks, bioreactors, and water treatment facilities, where corrosion resistance and accuracy are critical.

- Civil Engineering: Applications in dams and construction sites to assess water levels and ensure structural safety.

Conclusion

The RKL-01 Submersible Liquid Level Transmitter exemplifies the advancements in liquid level meter technology, combining robust design, precision engineering, and versatility. As a key tool in water management, industrial processes, and environmental monitoring, it addresses the challenges of measuring liquid levels in demanding environments.

With features like wide-temperature compensation, corrosion resistance, and multiple output options. Whether used in a small irrigation pond or a large industrial tank, this sensor delivers the accuracy and durability required to meet modern liquid level measurement needs.

RKL-01 Submersible Liquid Level Transmitter Submersible Water Level Sensor

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