1. Product Introductions

Accurate and reliable liquid level monitoring is essential for urban drainage systems, industrial production, and environmental protection. However, traditional monitoring instruments often struggle in harsh, unpowered, or confined environments such as underground manholes, inspection wells, and sewage pipelines—where long-term power supply and communication stability are critical challenges.

The product adopts advanced lithium battery power supply technology, featuring a unique ultra-low power consumption design that enables long-term stable operation without external power sources, effectively addressing power supply challenges in harsh environments. With an IP68 protection rating, it is completely dustproof and capable of prolonged immersion under water pressure, making it ideally suited for complex and demanding applications such as manholes.This smart liquid level monitoring device is engineered with advanced lithium battery power technology and an ultra-low power consumption design, ensuring continuous and stable operation for years without external power. Rated IP68, the device is fully dustproof and waterproof, allowing reliable performance even under long-term submersion or high-pressure water environments—making it ideal for complex, unattended field applications.

Designed as a highly integrated all-in-one unit, the system combines the following key components:

Millimeter-wave radar module – Delivers rapid and precise non-contact level measurement with minimal interference from temperature, foam, or media density.
Pressure measurement module – Captures hydrostatic pressure changes to complement radar data, enhancing overall measurement accuracy.
RTU (Remote Terminal Unit) – Provides local data acquisition, preprocessing, and intelligent logic control.
4G/NB-IoT communication module – Ensures stable, real-time data transmission to cloud platforms or monitoring centers.
Lithium battery power supply – Guarantees long-term autonomous operation in off-grid conditions.

2. Measurement principle

The integrated inspection well water level monitoring instrument is used for real-time water level monitoring in urban drainage systems, manholes and underground pipelines. Its working principle combines the advantages of two technologies (radar wave measurement and hydrostatic pressure sensing) to enhance measurement accuracy and reliability.The integrated water level monitoring instrument is designed for real-time water level monitoring in urban drainage systems, manholes, and underground pipelines. It combines millimeter-wave radar sensing with hydrostatic pressure detection to deliver high precision, reliability, and redundancy.

★ Radar wave measurement
It emits high-frequency electromagnetic waves and calculates the water level height by receiving the reflected echo signals from the water surface. This non-contact measurement method is unaffected by water density, temperature, foam, or corrosiveness, making it suitable for complex environments (such as water surface fluctuations, high levels of suspended solids, or gas interference).

The radar module emits high-frequency electromagnetic waves and measures the time delay of reflected signals from the water surface.

Advantages: Non-contact measurement, immune to variations in temperature, density, foam, or corrosive liquids.

Applications: Suitable for environments with fluctuating water surfaces, high suspended solids, or gas interference.

★ Hydrostatic pressure water level measurement
Based on the principle of hydrostatics, which states that the static pressure of a liquid is proportional to the height of the liquid level. The sensor measures the pressure exerted by the liquid on the pressure sensor and converts it into the liquid level height.

Based on the hydrostatic principle—that liquid pressure is proportional to depth—the pressure sensor measures the static pressure exerted by the liquid and converts it into level height.

Advantages: Stable, accurate readings unaffected by surface turbulence.

Applications: Ideal for long-term submerged environments.

★ Radar+hydrostatic fusion measurement

The radar serves as the primary measurement unit, providing non-contact, high-precision liquid level data. The hydrostatic sensor acts as the auxiliary unit, offering redundant data and calibrating potential radar errors (e.g., poor liquid surface reflection conditions).

The system employs sensor fusion technology, using radar as the primary measurement source and the pressure sensor as a redundant calibration reference.
Through intelligent algorithms such as weighted averaging and Kalman filtering, data from both sensors are fused to compute the optimal water level output in real time.

• When radar readings are affected by foam or vapor, the system automatically switches to pressure-based data.
• Conversely, when sediment affects the pressure sensor, radar data take precedence.

This dual-sensor fusion design ensures high accuracy, stability, and reliability, even under extreme environmental conditions.

3. Function

★ Dual-mode liquid level measurement
The system utilizes a millimeter-wave radar ranging module to accurately measure liquid level distance, while also incorporating a pressure-based liquid level module. The two components complement each other for monitoring, effectively reducing environmental interference and ensuring the accuracy and stability of pipeline liquid level overflow measurement.Combines millimeter-wave radar and pressure-based sensors to form a complementary monitoring mechanism. This reduces environmental interference and guarantees high-precision, continuous water level monitoring in drainage pipes, sewers, reservoirs, and manholes.
★ Smart Hierarchical Warning
The device features a built-in high-precision liquid level algorithm model, which accurately calculates liquid level data based on dynamic fluid analysis technology. It supports multi-level water level alerts and intelligently adjusts data collection /transmission frequency to ensure efficient and stable system operation.An embedded high-precision liquid level algorithm analyzes real-time flow dynamics to trigger multi-level alert thresholds. The system automatically adjusts data collection and transmission frequency, optimizing performance and minimizing power consumption.
★ Multi-center management
Equipped with a one-station, multi-transmission capability, the system can accurately deliver the data to multiple data centers, meeting the data management needs of multiple departments. This enhances data sharing efficiency and utilization rates, facilitating cross-departmental collaboration and enabling in-depth data analysisSupports multi-channel data transmission to multiple management centers, enabling cross-departmental data sharing, centralized analytics, and real-time visualization. This design is ideal for municipal drainage authorities, environmental bureaus, and emergency management departments.
★ Offline data recovery and retransmission
Large Cache Zone Design with dynamic allocation technology to prevent data loss during sudden network interruptions. Supports historical data storage and transmission, while enabling intelligent recognition and automatic retransmission of the data upon network recoveryThe device features a large-capacity cache with dynamic memory allocation to prevent data loss during communication interruptions. Historical data are automatically stored and intelligently retransmitted once the network is restored, ensuring complete and reliable data integrity.
★ Remote management of equipment
The system supports both online remote configuration for quick parameter setup and local Bluetooth APP configuration, enabling on-site adjustments with intuitive operation,

Supports dual-mode configuration:

• Remote online management for batch configuration and system updates.

• Local Bluetooth App configuration for on-site parameter tuning and quick diagnostics.
  This enables intuitive, efficient, and flexible field operation.

★ Online maintenance
The device connects to a remote management platform via a wireless Through its 4G/NB-IoT wireless communication module, the device connects to cloud platforms for remote maintenance, diagnostics, and firmware updates.
Real-time fault detection and predictive maintenance capabilities significantly improve system uptime, reduce manual inspection costs, and support smart O&M (Operations & Maintenance).