ESMDR500 High-quality integrated capacitive liquid level sensor for Solid, liquid

The ESMDR500 digital display capacitive liquid level meter operates based on the principle of capacitive sensing. Its core probe is equivalent to a capacitor, composed of a central electrode and the container wall (or an external electrode), with the measured medium serving as the dielectric in between. 

When the liquid level changes, the dielectric constant of the medium surrounding the probe changes, leading to a corresponding change in capacitance. The higher the liquid level, the larger the proportion of liquid with a high dielectric constant, and the greater the capacitance value.

The built-in signal processing circuit converts the capacitance change into a standard electrical signal. After amplification and linearization, the microprocessor calculates the liquid level value, which is then displayed in real-time on the LCD screen. At the same time, it can output a 4-20mA analog signal or a switch signal for remote monitoring and automatic control.

This principle is simple and reliable, unaffected by the color or density of the medium, making it suitable for various working environments.

High-Precision Measurement: Utilizes advanced capacitive sensing technology, achieving a measurement accuracy of ±1%, with good repeatability and long-term stability and reliability.

Intuitive Display: Equipped with a high-brightness LCD digital display, allowing direct reading of liquid level, percentage, and status information on-site without the need for additional instruments.

Rich Signals: Supports 4-20mA standard current output, RS485 communication, and switch alarm output, facilitating integration with DCS/PLC systems for remote monitoring.

Strong Adaptability: Probes are available in various materials such as stainless steel, titanium, and PTFE, resistant to acid and alkali corrosion, suitable for a wide temperature range of -40℃ to 250℃, with an IP65 protection rating.

Easy Installation: Compact structure, supports various installation methods including flange, thread, and top installation, allowing maintenance and calibration without shutdown.

Wide Applications: Suitable for liquid, granular, and powder material level monitoring in tanks across industries such as chemical, pharmaceutical, food, and water treatment.

1. Water Treatment and Environmental Protection
Wastewater Tank/Water Tank: Measure the level of tap water, sewage, and wastewater.
Acid-Base Storage Tank: Use PTFE-lined probes to measure highly corrosive chemicals (hydrochloric acid, sulfuric acid, sodium hydroxide).

2. Petrochemical Industry
Oil Monitoring: Diesel, gasoline, and lubricating oil storage tanks (non-conductive media).
Reactor: Level monitoring in stirred reactors (single-electrode type with strong anti-interference capability).

3. Food and Pharmaceutical
Hygienic Applications: Stainless steel polished probes for milk, juice, and medicinal liquid tanks.
CIP Cleaning Resistance: Can withstand high-temperature steam and chemical cleaning agents.

4. Special Working Conditions
High-Temperature Molten Salt/Molten Metal: Special models with ceramic-insulated probes.
Deep Wells/Deep Tanks: Flexible cable-type single-electrode probes for wells dozens of meters deep.