MERCURY - Smart Water Monitoring Systems Manufacturer

1. Instructions

The Hydrostatic Pressure Liquid Level Sensor is a high-precision, low-power industrial device designed for long-term liquid level monitoring in harsh and complex environments.
It features an IP68 protection rating, RS485 communication interface, and standard Modbus protocol, ensuring stable data transmission and easy integration with SCADA or IoT systems.

Constructed with a corrosion-resistant stainless-steel housing, the sensor utilizes a silicon piezoresistive sensing element with a stainless steel isolation diaphragm for accurate water level measurement.
The signal is processed by a high-precision A/D converter with zero-point and temperature compensation, maintaining excellent stability and accuracy across a wide temperature range.

Powered by low-voltage DC supply, the sensor is suitable for indoor, outdoor, and off-grid environments.
It is widely used in petroleum, petrochemical, metallurgy, environmental protection, municipal engineering, wastewater treatment, marine, power generation, process control, and emergency rescue monitoring industries.

2. Principle
The sensor operates on the principle that hydrostatic pressure is directly proportional to the liquid height.
The pressure-sensitive diaphragm detects the hydrostatic pressure and converts it into an electrical signal.
This signal undergoes temperature compensation and linear correction, producing a standardized, stable output that accurately represents the liquid level, even under fluctuating environmental conditions.
3. Electrical characteristics

The sensor supports multiple wiring configurations to adapt to different system requirements:

Two-wire configuration:
One wire connects to the positive power terminal, while the second wire (signal line) passes through the instrument to the negative terminal.
Three-wire configuration:
Adds a third wire to the two-wire setup, providing a dedicated ground connection for improved stability.
Four-wire configuration:

Includes two power supply lines and two signal output lines, ensuring reliable separation between power and signal transmission.

4. Installation Instructions
4.1. Installation precautions
1. Avoid operating the sensor in high-temperature, over-range pressure, or strong electromagnetic environments, as these conditions may degrade accuracy or shorten service life.

2. For static liquid level measurement, submerge the sensor close to the tank bottom but avoid direct contact with sludge or sediment.
For sediment-prone liquids, maintain a 10–15 cm clearance above the container bottom to prevent blockage.

3. Install the sensor within a PVC conduit, steel pipe, or protective sleeve of larger diameter to ensure stable positioning.
The sleeve should include perforated openings at different heights to allow free water entry.
For silty environments, use a sediment barrier or filter assembly to reduce interference from waves or dynamic pressure.

4. The sensor must be mounted vertically and positioned away from inlets, outlets, or strong vibration sources to ensure stable readings.

5. Never touch or press the pressure-sensitive diaphragm with hard or sharp objects to avoid permanent damage.

6. Select different sensor structures or materials depending on the medium being measured to ensure compatibility and longevity.

1. The stainless steel isolated silicon piezoresistive sensor is utilized to achieve wide temperature range zero-point compensation and temperature performance compensation.
2. The liquid level signal is acquired through a high-precision AD converter.
3. IP68 protection class, the device is suitable for indoor, outdoor, and other harsh environments.
4. RS485 communication interface and standard Modbus protocol
5. Ultra-low power consumption

Item name	Parameter
Measurement principle	Pressure
Measurement range	0～15m options
Measurement precision	±0.5%FS
Communication method	RS485
Communication protocol	Modbus RTU
Voltage	DC12～24V
Protection class	IP68
The device features excellent waterproof, dustproof, and electromagnetic compatibility (EMC) technical characteristics

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