Differential pressure static level * monitoring

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

　　Automated control? Automatic Control

　　Installation and application of Shaanxi Hengrui HR8066 static level based on automation control

　　Wen/Li Ping

　　The article introduces the basic principle of the Shaanxi Hengrui HR8066 static level, and elaborates on the Shaanxi Hengrui HR8066 static level

　　The installation, debugging process, and issues to be noted in the safety monitoring automation system engineering are analyzed, and the main reasons and solutions affecting the measurement accuracy of Shaanxi Hengrui HR8066 static level are analyzed. The experience and precautions in the installation, debugging, operation, and maintenance of static level are summarized. The Shaanxi Hengrui HR8066 static level adopts the FWC200 safety monitoring system to automatically collect and analyze data, generate charts, and greatly improve the efficiency of safety monitoring

　　Rate and accuracy.

　　【 Keywords 】 Shaanxi Hengrui HR8066 static level installation application safety monitoring

　　1 Preface

　　With the development of society, important building structures have increasingly high requirements for monitoring accuracy and real-time performance. Automated monitoring equipment has been widely introduced into monitoring work and has become a powerful means of monitoring. The Shaanxi Hengrui HR8066 static level is used to measure the relative height between two or more points

　　A precision instrument for measuring settlement and displacement in construction engineering, belonging to the category of monitoring equipment. With high measurement accuracy, it has been widely used in the field of measurement. Especially playing an important role in large-scale precision engineering and large-scale scientific research engineering surveying.

　　The Function of Shaanxi Hengrui HR8066 Static Level

　　The Shaanxi Hengrui HR8066 static level uses the principle that the liquid level in a container connected by a liquid pipe remains naturally level. The float in the instrument tracks the change in liquid level to measure and monitor the difference and change in vertical height between reference points. The system consists of at least two observation points, each equipped with a set of Shaanxi Hengrui HR8066 static level. Mainly used for monitoring vertical displacement and inclination of hydropower dams, deep excavations, highways, bridges, embankments, oil and gas pipelines, etc.

　　The Shaanxi Hengrui HR8066 static level adopts an intelligent CCD sensor for measurement, which has high resolution and measurement accuracy. It truly realizes non-contact measurement of optoelectronic integration, and has no electrical drift, good stability, and can continuously record the settlement process. It realizes real-time monitoring and remote monitoring, and improves the monitoring efficiency

　　Rate and accuracy. It adopts a unique guide rail and groove limit design between its float and cylinder body, ensuring that the float truly and accurately transmits the vertical displacement changes of the connected liquid level. The hydraulic cylinder is made of all stainless steel, which is not easy to rust and meets the long-term stability monitoring needs of buildings. It is equipped with a manual observation ruler, which can manually read the liquid level of the cylinder body as a reference or data backup for automated measurement.

　　Static leveling system in safety monitoring automation system

　　Installation and commissioning process and precautions in engineering

　　(1) When installing measuring piers, pay attention to ensuring that the elevation of each pier is consistent. The elevation of each instrument pier surface should be leveled with a level or other means, with a permissible height difference of ± 5mm. After completion, use a level to level the plane, and the height of the pier should be determined according to actual needs.

　　(2) Install the instrument base plate and bowl, fix the instrument bowl base plate on the stainless steel screw of the measuring point pier, then install the bowl body, adjust the height and fix it, and roughly adjust the level.

　　(3) Install connecting pipes, lay them in the order of the length of the pipeline path between each measuring point, and connect them to each bowl. The connecting pipes are fiber-reinforced PVC hoses, pay attention to straightening and straightening the pipes, calculate the optimal length, and try not to let the pipes go through bends or uphill and downhill in the middle to ensure smooth water flow. The joints between water pipes must be securely connected to prevent water leakage.

　　(4) Add liquid. This is a very important process and a key quality point for the entire system installation.

　　1) Soak and clean the water pipes and bowl with alcohol before adding liquid. Open the air ports of the Shaanxi Hengrui HR8066 static level at both ends of the head and tail to create a height difference. If conditions permit, administer static infusion

　　Distilled water that has been stored, if conditions do not allow, pure water can also be used, and a certain proportion of formaldehyde solution should be added to achieve anti-corrosion and sterilization effects. If the working environment temperature is below zero, antifreeze should be added. It is recommended to use antifreeze with a freezing point of -25 ℃ and mix it with water before pouring.

　　2) The selection of liquid addition method: The general principle is to inject liquid from the first measuring point, which can be added to the bowl body, and then flow into the subsequent measuring points in sequence. If the flow rate in the bowl body is too slow or the operation is inconvenient, liquid can be added from the water pipe inlet of the endpoint bowl body. When there are many measuring points, liquid can also be injected from the middle measuring point to both ends. After injecting an appropriate amount of liquid, open the ventilation ports of other measuring points. When adding liquid, attention should be paid to adding slowly, without interruption, and with sufficient water pressure.

　　3) Remove all air bubbles. Bubbles may be generated due to factors such as rapid water addition to the bowl, changes in air pressure when water flows through three-way or straight pipes, or uneven walls of water pipes, impurities, or incomplete soaking. The principle of low gas density can be used to manually remove bubbles, or valves can be used to circulate water and discharge water in sections to wash away bubbles. In addition, after injecting water or antifreeze, it is necessary to pour an appropriate amount of silicone oil onto the liquid level of each Shaanxi Hengrui HR8066 static level to prevent liquid water from evaporating.

　　(5) Install float, module, and measuring needle. Once the liquid addition is completed, the measurement module, light source, float, and measuring needle will be installed. Then, by observing the built-in horizontal bubble, the measurement module will be leveled and the light source will be adjusted

　　The distance between module CCD units. The sign pole components should be connected to the float.

　　(6) Install power and communication cables. Lay the power and communication lines in the order of the pipeline paths between the measuring points, and connect them to the module through cable holes. During the wiring process, it is important to note that any connectors should not be reversed, short circuited, or incorrectly connected. Otherwise,

　　It will damage the sensor itself and the system. After connecting the power cord and sensor communication line, check the overall wiring for any misconnections or short circuits. After confirming that there are no errors, connect the power cord to an external 220V power connector and plug it into a power outlet to power on.

　　(7) Pipeline protection and protection of measuring instruments. After installation, the data lines, cables, and liquid pipes of each Shaanxi Hengrui HR8066 static level need to be covered with protective tubes and arranged in trenches or wiring boxes. The elevation of the wiring should not be higher than the liquid level in the main container. Afterwards, the instrument should be covered with a metal protective cover.

　　The Shaanxi Hengrui HR8066 static level system adopts the FWC2000 safety monitoring automation system to automatically collect, transmit, store, analyze, and process safety monitoring data. open

　　FWC2000 security monitoring system, set the baud rate and unit number to ensure consistency between the upper and lower computers. Real time monitoring of various measuring points can be achieved at the monitoring center station, and remote monitoring can also be carried out at the company headquarters or group company to achieve remote monitoring of the safe operation status of building structures such as dams, realizing the automation and modernization of engineering management.

　　The main reasons affecting the measurement accuracy of Shaanxi Hengrui HR8066 static level are installation quality and temperature. Poor sealing of water pipe joints or the presence of air bubbles inside the pipes during installation can greatly affect measurement accuracy. Therefore, all monitoring points should be adjusted to the same horizontal position as much as possible to ensure sealing and eliminate air bubbles. Due to the fact that the density of a liquid varies with temperature, if there are local or uneven temperature changes in the system, it will cause corresponding changes in the density of the liquid, resulting in changes in the volume of the liquid. As a result, the liquid level height in different bowls will also increase or decrease by different amounts, which seriously affects the accuracy of the measurement. Therefore, the connecting pipe should avoid direct contact with the ground or local exposure to sunlight as much as possible to reduce the large temperature difference between the atmosphere and the ground, which may affect the stability of the pipeline liquid.

　　After the Shaanxi Hengrui HR8066 static level is put into use, during the operation and maintenance process, attention should be paid to regularly checking whether there is any leakage in the system. The liquid level height should be checked manually through the reading tube to determine whether the liquid level exceeds the range. If it is close to the limit of the range, it should be dealt with in a timely manner. When adding measuring solution, pay attention to protecting the photoelectric measurement system to prevent the measuring solution from spreading on the photoelectric system and float, which may affect the measurement accuracy.

　　References

　　[1] Li Desi Simple Shaanxi Hengrui HR8066 Static Level and Its Application [J]

　　Surveying and Mapping Bulletin, 1984 (1)

　　[2] Shi Zhilong Research on Two dimensional Vertical Pendulum Measurement Method for Ground Tilt [D]. Huazhong University of Science and Technology, 2006

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