Manufacturer of settlement static level

Description :

　　1. Overview

　　The HR8066/67 high-precision static level is suitable for monitoring vertical displacement or settlement deformation with high requirements, and can monitor liquid level changes up to 0.01mm. The instrument consists of a series of containers containing liquid level sensors, which are connected by liquid filled connecting pipes between multiple containers. The reference container is located at a stable reference point, and any elevation change between the container and the reference container will cause a corresponding change in the liquid level inside the container. The elevation change of the measuring point can be obtained by measuring the liquid level change.

　　The HR8066/67 high-precision static level adopts high-quality pressure sensitive components from around the world. The static level product adopts a multi-point full range temperature compensation process of -20-60 ℃, which has the advantages of high measurement accuracy, no drift, strong reliability, and easy installation. The sealed shell has good moisture resistance and can work continuously for a long time in a relative humidity environment.

　　2. Technical parameters of static level

　　①. Main performance indicators

　　Standard range: 1000mm or other

　　Accuracy: ＜ ± 0.3mm

　　Resolution: 0.01mm

　　Annual stability: ＜ ± 0.5mm

　　Overload capacity: 200% F? S

　　②. temperature characteristic

　　Working temperature range: -20~85 ℃

　　Temperature compensation range: -20-60 ℃

　　Temperature sensor:

　　Temperature measurement range -40~150 ℃

　　Temperature measurement accuracy ± 0.2 ℃

　　③. Electrical Characteristics

　　Electrical Connection: Waterproof Four core Plug in

　　Supply voltage: 5-24VDC (HR8066)

　　12～24VDC（HR8067）

　　Output signal: MODBUS-RUT (HR8066)

　　4～20mA（HR8067）

　　Power protection: anti reverse connection, overvoltage protection

　　Communication interface: RS485, electrostatic protection

　　④. structural characteristics

　　Shell material: Aluminum alloy

　　Pipeline connector: stainless steel quick connector or stainless steel threaded locking connector

　　⑤. environmental characteristics

　　Protection level: IP67

　　Installation method: The exhaust valve is fixed vertically with the exhaust valve facing upwards

　　Electrical connection of static level

　　HR8066：

　　Red - Power Supply+

　　Yellow - Power Supply-

　　Blue - RS485- A

　　Green - RS485- B

　　HR8067：

　　Red - DC24V+

　　Blue -4-20mA output (GND)

　　4. Structural characteristics of static level

　　HR8066:

　　5. Connection of static level pipeline

　　Each level is designed with a liquid storage space inside, which is connected to each other using a plastic pipe with a diameter of 8mm, and the other end is connected to a liquid storage tank. When in use, the pipeline and the liquid storage space inside the level are filled with liquid (air must be completely removed);

　　HR8066 pipeline interface

　　6. Working principle of static level

　　Using the pressure difference in a sealed liquid to monitor changes in the elevation difference of settlement points. When the settlement of the reference point is set to zero and the level changes with the settlement of the measured point, the change in elevation difference between the reference point and the measuring point is the settlement value of the measured point, which is expressed by the pressure difference between the reference point and the measured point.

　　The factors that affect the measurement accuracy of the system mainly come from the drift of the level sensor with temperature and the evaporation of the system liquid. For the temperature drift of the sensor, a multi temperature point compensation process is adopted to ensure that the sensor meets the measurement accuracy index within the compensation temperature range and meets the requirements for on-site use.

　　To achieve long-distance multi-point monitoring function, the level adopts industrial grade RS485 digital communication interface,

　　Working in half duplex master-slave mode, the transmission distance can reach 1200 meters, and the serial communication format is as follows:

　　Serial port data format:

　　Baud rate: 9600bps;

　　Checkpoint: No checksum.

　　Stop position: 1 position.

　　Data bit: fixed at 8 bits.

　　According to the RS485 protocol specification, communication nodes should have Shuoyuan addressing, and each level node should set a separate communication address (1-254), which is hung on the RS485 bus. The RTU, as the RS485 host, sends acquisition instructions to each level slave, and collects the liquid level and temperature values of each level according to the address through the 03H function code of the MODBUS protocol.

　　Application of 7 static level in static pressure settlement monitoring and deformation monitoring system

　　The system mainly consists of a liquid storage tank (reference point), a settlement measurement point, a data collector, and a sending device, as shown in the figure:

　　The position of the liquid storage tank should be slightly higher than the settlement measurement point, and it should be connected to the sensors at each measurement point through a liquid connecting pipe. Liquid should be added to the liquid storage tank, and the air in the pipeline should be discharged through the exhaust valves of each sensor to form a closed liquid.

　　The liquid storage tank should be installed in a stable and reliable location that is easy to measure. Anti settlement and anti movement measures should be taken to form a reference point. The static level should be installed at the location where settlement needs to be monitored. The pressure (liquid level) and temperature signals output by the level should be transmitted to the RTU collector through RS485 bus according to the monitoring frequency set by the RTU, and then sent to the monitoring center server through wireless networks such as GPRS.

　　The benchmark and the level are connected in a differential manner, and the level is equipped with a dedicated atmospheric interface. In the system, each level is connected to the atmosphere through a ventilation pipeline, forming automatic atmospheric compensation and eliminating measurement errors caused by external factors such as temperature, humidity, and atmospheric pressure changes.

　　8. Case study of static level and explanation of stable situation

　　Explanation: The data shows that the stable type of the product can be within 0.01mm.

　　Project situation: Settlement monitoring of a tunnel in a southeastern province, with a total length of 400m and a height difference of 8m, using segmented measurement.

　　HR8066/67

　　Type high-precision static level

　　HR8066/67 high-precision static level

　　Just a moment ago, just a moment ago

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