The Liquid Level Sensor measures the level of water or other liquids and converts it into a standard 4–20 mA current signal. It works with data loggers and other devices that support 4–20 mA current inputs.

The sensor has a built-in silicon piezoresistive sensing element with high sensitivity. Its internal circuitry converts the millivolt signal into a standard 4–20 mA current signal. This output allows connection to control instruments, PLCs, or computer-based data acquisition systems with compatible current inputs.

The sensor is compact, lightweight, and easy to install. Its sealed stainless steel probe is suitable for use in water, oil, and other mildly corrosive liquids. In addition, it offers high resistance to vibration and impact. It can be used in process control, aviation, aerospace, automotive systems, medical equipment, HVAC, and other applications.

• High performance: strong interference resistance and long-term stability
• Robust construction: corrosion-resistant materials for durability
• Easy maintenance: anti-blocking design for easy cleaning
• Wide compatibility: standard 4–20 mA current output for digital displays, PLCs, inverters, recorders, and other instruments with compatible current inputs
• Industrial-grade protection: IP68-rated construction for use in harsh outdoor environments
• Certifications: FCC, CE, and RoHS

Recommendation for S2100 Data Logger

This sensor provides a standard 4–20 mA analog current output and can connect to the SenseCAP S2100 LoRaWAN® Data Logger for remote liquid level monitoring. The S2100 supports Modbus RS485, analog, and GPIO industrial sensors and transmits their data over LoRaWAN® networks. Its robust, waterproof, and dustproof enclosure makes it suitable for harsh outdoor environments. It offers a transmission range of up to 2 km in urban areas and 10 km in line-of-sight conditions, with low power consumption. In addition, built-in Bluetooth and app support simplify configuration and remote management. The sensor requires a supply voltage of at least 9V DC. The S2100 cannot power it directly, so an external power supply is required. When the S2100 is connected to an external 12V DC supply, its replaceable built-in battery serves as backup power for the data logger.

Seeed also provides the SenseCAP Portal and SenseCraft to help users better manage and check data remotely.

Output Current

Wiring Diagram

Probe Dimensions

• Reservoir detection
• Pool pump station
• River monitoring
• Lake monitoring
• Sewage treatment
• Deep well level monitoring
• Tank level monitoring