CG-78 Hydrostatic Level

Product Overview

The hydrostatic level is an instrument used to measure the relative elevation changes between two or multiple points. It consists of a liquid reservoir, a high-precision core, specially customized circuit modules, a protective cover, and other components. The settlement system is composed of multiple sensors of the same model, with the liquid reservoirs connected by vent pipes and liquid communication pipes. The reference point is placed at a stable horizontal base. When the measuring points rise or fall relative to the reference point, it causes changes in pressure at each point. By measuring the changes in sensor pressure, the relative vertical displacement of each measuring point relative to the horizontal base point is calculated.

Features

1. Utilizes pressure sensors to measure the liquid pressure difference, enabling direct and intuitive monitoring of settlement through prior calibration and fitting.

2. Compact size, high precision, and optional measurement ranges.

3. Can be installed following ground contours without the need for leveling or transfer points. The fully sealed structure allows for underground burial.

4. Eliminates the impact of air pressure changes on measurement accuracy through the use of air guide pipes.

5. The hardware features an RS485 interface with strong compatibility. It can be externally connected to a LoRa module to form a LoRa self-organizing network for low-power, long-distance transmission. It can also be connected to a 4G module for remote communication.

6. Equipped with wide temperature compensation (-20~60°C), making it suitable for various harsh environments. In the following image, the entire range shows a variation of over 30 degrees. This product utilizes special temperature compensation methods, resulting in a drift of 0.7 mm, a full-scale temperature drift error of 0.035%, and a temperature coefficient of 19.4 ppm/°C.

7. No liquid surface flow is required at the measuring points. Settlement is reflected in real-time through liquid surface pressure differences, ensuring stronger data timeliness.

8. Employs various low-power sensors and microprocessor chips to reduce bus voltage drop, enabling longer bus power supply distances.

Working Principle

The operation based on Pascal's principle involves determining the height difference between two points through the pressure difference of the liquid column at different heights. Specifically, when the hydrostatic level is stationary, the liquid column forms a horizontal surface between the two measuring points. At this time, since the pressure of the liquid column is equal between the two points, the height difference is zero. When there is a height difference between the two points, the liquid column tilts, altering the pressure difference between the measuring points. By measuring this pressure difference, the height difference between the two points can be calculated.



Technical Parameters

Range: (0~500, 0~1000, 0~2000) mm

Overall Accuracy: Less than 0.05% FS

Non-Linearity: 0.02% FS

Stability: <0.05% FS/year

Output Signal: RS485

Supply Voltage: (9-36) V DC

Operating Temperature Range: -40~80°C

Compensation Temperature Range: -20~60°C

Overload Pressure: 100 times

Medium Material: Aviation Aluminum

Electrical Connection: Four-core cable

Protection Rating: IP67


Applications

Suitable for settlement and displacement monitoring of large storage tanks, dams, power plants, high-rise buildings, foundation pits, tunnels, bridges, subways, and other structures.