SLDL2850 Series SonarDetect External Ultrasonic Liquid Level Switch

The SLDL2850 External Ultrasonic Liquid Level Switch enables truly non‑contact liquid level detection in sealed pressure vessels. The SLDL2850 External Ultrasonic Liquid Level Switch is mounted externally below the tank wall, requiring no tank penetration or drilling, making it the safest choice for hazardous, corrosive, and hygienic industrial processes.

Product Introduction of SLDL2850 External Ultrasonic Liquid Level Switch

Solidat Applied Technologies Ltd. is a leading manufacturer and supplier of the SLDL2850 External Ultrasonic Liquid Level Switch in China. We offer high‑quality SLDL2850 External Ultrasonic Liquid Level Switch units from stock and support full customization for special working conditions. Customers are welcome to request factory quotations. We provide reliable service and competitive pricing for global industrial clients.

The SLDL2850 External Ultrasonic Liquid Level Switch enables fully non‑contact level monitoring in closed tanks. Installed externally on the tank bottom, it requires no vessel openings or process shutdown. The SLDL2850 External Ultrasonic Liquid Level Switch accurately detects levels of toxic fluids, strong acids, alkalis, and pure liquids in high‑temperature and high‑pressure environments. It is compatible with metal, glass, and plastic tanks and features an explosion‑proof design for broad industrial use.

Working Principle of SLDL2850 External Ultrasonic Liquid Level Switch

The SLDL2850 External Ultrasonic Liquid Level Switch uses a sonar probe to transmit ultrasonic signals through the tank wall. Signals reflect off the liquid surface and are captured by the controller. The SLDL2850 External Ultrasonic Liquid Level Switch analyzes echo characteristics to judge whether the medium has reached the preset alarm level, outputting a stable switching signal.

Features of SLDL2850 External Ultrasonic Liquid Level Switch

•Advanced SonarScan signal processing ensures high measurement stability of the SLDL2850 External Ultrasonic Liquid Level Switch.

• Fully non‑immersion external installation: no shutdown, no fire risk, no tank modification.

• Isolated from process media, no contamination, ideal for food, beverage, and pharmaceutical hygiene applications.

• Compatible with metal, glass, plastic tanks; suitable for high‑pressure, toxic, and corrosive scenarios.

• Measurement unaffected by liquid surface foam.

• Multi‑language UI with echo curve display for easy on‑site debugging.

• IP68 high protection rating.

• SIL3 safety certification, Ex d IIB T4 / Ex ia IIC T6 explosion‑proof grade.

• Supports HART, Modbus, Profibus PA, Foundation Fieldbus, GPRS/CDMA remote, and Bluetooth communication.

Technical Parameters of SLDL2850 External Ultrasonic Liquid Level Switch

Applications of SLDL2850 External Ultrasonic Liquid Level Switch

The SLDL2850 External Ultrasonic Liquid Level Switch is widely used in:

• Oil & gas, chemical, and petrochemical industries

• Pharmaceutical and food & beverage (hygienic processing)

• Water treatment and wastewater systems

• High‑pressure, toxic, corrosive liquid storage tanks

• Sealed vessels requiring non‑intrusive, explosion‑proof level alarm