Pressure static level, differential pressure settlement instrument

Description :

　　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 pressure sensitive components of global quality. 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

　　Analysis of factors affecting the accuracy of Shaanxi Hengrui HR8066 static level in subway settlement monitoring

　　Summary: In today's rapidly developing economy, railway construction has had an undeniable impact on our lives, and ensuring its construction quality has become increasingly important. The Shaanxi Hengrui HR8066 static level, as an advanced measuring instrument, has been increasingly widely used in fields such as subway and tunnel settlement detection. Ensuring the accuracy of the Shaanxi Hengrui HR8066 static level measurement is an important task in settlement detection work. The article introduces the working principle of the Shaanxi Hengrui HR8066 static level and focuses on the relevant factors that affect the accuracy of the HR8066 level. Keywords: Shaanxi Hengrui HR8066 static level; Subway subsidence; precision

　　1 Introduction

　　With the rapid development of China's economy and society, the urban population continues to increase, and urban rail transit has flourished. Major cities have launched the construction and planning of subway lines. Among various modes of public transportation, urban subways have obvious advantages in terms of speed and punctuality, and have always been an important way for us to travel. With the continuous development of subway technology and applications, its safety has become increasingly concerned. The settlement value of urban subway is an important indicator for measuring its operational safety, and effective monitoring of it is a prerequisite for ensuring the safety of the subway system. So continuously improving the accuracy of subway settlement monitoring is an effective means to ensure its stable and safe operation. Compared with traditional settlement monitoring methods, using the Shaanxi Hengrui HR8066 static level for subway settlement monitoring can real-time grasp the vertical displacement of the subway structure, which is beneficial for the safe operation of the subway

　　Currently, the Shaanxi Hengrui HR8066 static level on the market mainly includes capacitive and electric measuring instruments

　　There are three types: inductive and photoelectric. The HR8066 system has at least two observation points, consisting of hydraulic cylinders, floats, precision level gauges, protective covers, support frames, and other components. It is mainly used for monitoring vertical displacement and tilt in large storage tanks, dams, nuclear power plants, high-rise buildings, foundation pits, tunnels, bridges, subways, and other areas. The Shaanxi Hengrui HR8066 static level is a high-precision liquid level measurement device. It is based on the principle of connected liquid and sets up multiple connected measuring points. The liquid level of each container is measured by a magnetostrictive sensor, and the float position of the sensor changes synchronously with the change of liquid level, thus measuring the liquid level change of each measuring point. By observing the relationship between the liquid level elevation of each measuring point container and the installation elevation, the settlement data of each measuring point can be obtained, and the settlement value can be obtained by comparing it with the reference point. The current mainstream HR8066 model

　　Under ideal conditions, the instrument can achieve a measurement accuracy of 0.1mm. Due to its precise and real-time characteristics, the Shaanxi Hengrui HR8066 static level is increasingly being used in settlement monitoring of subways, tunnels, and various facilities. The advantages of using Shaanxi Hengrui HR8066 static level for subway settlement monitoring are as follows: (1) high measurement accuracy. As a new type of instrument widely used in recent years, Shaanxi Hengrui HR8066 static level has obvious advantages in subway monitoring compared to the measurement method of conventional level with leveling ruler. As a precision instrument for measuring liquid levels, the Shaanxi Hengrui HR8066 static level usually has a measurement accuracy of sub millimeter level, and even some models of Shaanxi Hengrui HR8066 static level have a nominal accuracy of up to

　　Due to varying degrees of limitations, it is usually impossible to guarantee the accuracy of numerical values at the millimeter level

　　Sex. (2) Has a certain anti-interference ability. The HR8066 system is usually installed on concrete observation piers or dedicated installation brackets, with good indoor stability; Many advanced Shaanxi Hengrui HR8066 static level gauges have good air tightness and can withstand the influence of pressure changes to a certain extent; Most mainstream Shaanxi Hengrui HR8066 static level gauges are equipped with temperature compensation devices to reduce the impact of temperature changes on measurement results. Many models of Shaanxi Hengrui HR8066 static level gauges have a temperature compensation range of -10 to 40 ℃. (3) Capable of working at extreme temperatures. The mainstream Shaanxi Hengrui HR8066 static level on the market can usually achieve normal operation in the temperature range of -30 to 80 ℃. Conventional leveling measurements are more sensitive to temperature conditions and are more susceptible to temperature limitations. In practical measurement work, the conventional leveling measurement method is that on the one hand, equipment such as level gauges, level rulers, and ruler pads will deform due to temperature changes; On the other hand, measurement personnel are also unable to carry out measurement work normally under extremely low or high temperature conditions. (4) Simple deployment, easy maintenance, and high degree of automation. The assembly and connection of various components of Shaanxi Hengrui HR8066 static level is relatively simple. Usually, only connecting pipes are needed to connect the storage tank and each measuring point, and then the adjusted connecting liquid is injected from one end of the tank. After simple debugging and setting, the layout of Shaanxi Hengrui HR8066 static level can be completed. The storage container of Shaanxi Hengrui HR8066 static level is usually made of organic glass material, which not only prevents corrosion and rust, but also facilitates observation. The Shaanxi Hengrui HR8066 static level usually has advanced intelligent sensors, microcontrollers, and communication modules inside, which can be easily accessed

　　The degree is relatively high. However, at the same time, the HR8066 system also has its own limitations

　　Limitations of. For example, due to the viscous effect of liquids, when the height of the connected liquid inside the Shaanxi Hengrui HR8066 static level changes, it takes a period of flow to reach equilibrium again. Therefore, the HR8066 system is not suitable for measuring high-speed settlement changes. Analysis of factors affecting the monitoring accuracy of Shaanxi Hengrui HR8066 static level: Bernoulli equation is the theoretical basis for HR8066 measurement, and the specific formula is as follows: in the formula, P represents air pressure, ρ represents connected liquid density, g represents gravitational acceleration, and h represents the relative height difference between the measuring point liquid and the liquid surface. When the connected fluid is in equilibrium, we know that air pressure, connected fluid density, and gravitational acceleration are the main factors affecting the HR8066 elevation surface. Due to the use of the same liquid as the connecting fluid in the Shaanxi Hengrui HR8066 static level, and the fact that the difference in gravity acceleration within a small range can be ignored under normal circumstances, the values of ρ and g in the above equation are the same, which means that the influence of the density of the connecting fluid and the gravity acceleration of each measuring point in the Shaanxi Hengrui HR8066 static level can be ignored. The operation of subway trains has a significant impact on the environment within subway tunnels during operation. When a subway train is in a subway tunnel

　　When driving, it will bring certain changes to the comprehensive environment inside the subway, which will also have a significant impact on the accuracy of the Shaanxi Hengrui HR8066 static level, mainly reflected in the following three aspects: (1) the influence of air pressure. When the train passes, the air pressure inside the instrument will change. The rapid movement of the train will cause a sharp flow of air around it, which will affect the air inside the Shaanxi Hengrui HR8066 static level instrument placed nearby

　　When a train passes through, it will cause strong vibrations on the tracks and nearby ground. When the position of the static level measuring point is close to the subway track, the pressure on the track and ground caused by the passing of the train will make the reading of the measuring point unstable and have a tendency to sink, thereby causing the liquid level at the measuring point to tend to rise. On the contrary, when the subway train leaves the static level measuring point, the pressure brought by the subway train gradually weakens and eventually disappears, causing the measuring point to have a tendency to rise, thereby causing the liquid level at the measuring point to tend to fall. So the passing of the train will affect the accuracy of the instantaneous reading of the Shaanxi Hengrui HR8066 static level.

　　(3) The impact on the benchmark point. When the layout of the reference point is close to the subway track, when the train passes near the reference point, it will also produce the above-mentioned air pressure and vibration effects on the reference point, causing the instantaneous reading of the reference point to change, affecting the measurement value of the Shaanxi Hengrui HR8066 static level, and thus affecting the accuracy of subway monitoring.

　　In conclusion, the Shaanxi Hengrui HR8066 static level is widely used in subway settlement monitoring due to its advantages of stability, high degree of automation, etc

　　The safe operation of urban subways provides technical support. The accuracy of settlement monitoring in urban subways is greatly affected by the operation of subway trains. Due to the fluctuation of atmospheric pressure near the measuring point caused by train travel, as well as the vibration of Shaanxi Hengrui HR8066 static water level instrument and reference point, the observation values of Shaanxi Hengrui HR8066 static water level instrument will be affected, thereby affecting the accuracy of subway settlement monitoring. Therefore, when analyzing subway settlement data, it is necessary to take into account the factors that affect accuracy, reasonably avoid the running time of trains, and thereby reduce or eliminate the impact of train operation on the Shaanxi Hengrui HR8066 static level to ensure the accuracy of monitoring

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