法蘭式微壓液位變送器在水箱液位測量設計使用
Design and application of flange type micro pressure liquid level transmitter in water tank liquid level measurement
華恒變送器廠家憑借自身擁有的傳感器和智能電路板核心技術，可以根據(jù)客戶要求，低成本對核心技術進行延伸變形，實現(xiàn)個性化產品定制。主要產品有SMART（斯瑪特）系列壓力變送器、多參數(shù)變送器、流量器、溫度傳感器和物位（液位變送器廠家，為我國電力、石油、化工、冶金、水泥、礦業(yè)等行業(yè)提供了高性能價格比的工業(yè)自動變送器廠家產品.
With its own sensor and intelligent circuit board core technology, Huaheng transmitter manufacturers can extend and transform the core technology at low cost according to customer requirements to achieve personalized product customization. The main products are smart (SMART) series pressure transmitter, multi parameter transmitter, flowmeter, temperature sensor and level (liquid level transmitter manufacturer, which provides high performance price ratio industrial automatic transmitter manufacturer products for China's power, petroleum, chemical, metallurgical, cement, mining and other industries
微壓液位變送器的原理
Principle of micro pressure liquid level transmitter
微壓液位變送器其實質是采用壓力變送器來間接地測液位，如圖1所示。實際上，壓力變送器安裝在水箱距底部一定高度的側面，根據(jù)帕斯卡定律，其探頭檢測到的實質是檢測點處的壓強值。水箱側壁處檢測點的壓強同該點至液面的高度存在以下關系：
The essence of micro pressure liquid level transmitter is to use pressure transmitter to indirectly measure liquid level, as shown in Figure 1. In fact, the pressure transmitter is installed on the side of the water tank at a certain height from the bottom. According to Pascal's law, the essence of its probe detection is the pressure value at the detection point. The pressure of the test point at the side wall of the water tank has the following relationship with the height from the point to the liquid level:
H=P/ ρ g （1）
H=P/ ρ g （1）
式中：H為檢測點距液面的高度（m）；P為檢測點的壓強（Pa）； ρ 為液體的密度（kg/m 3 ）；g為重力加速度（m/s 2 ），取9.8。通過對檢測點壓強值的換算即可得到當前
Where: H is the height from the detection point to the liquid level (m); P is the pressure of the detection point (PA); ρ is the density of the liquid (kg / M 3); G is the acceleration of gravity (M / S 2), taking 9.8. Through the conversion of the pressure value of the detection point, we can get the current
檢測點同液面的高度值，再加上檢測點距水箱底的距離H 0 即可得到水箱的實際液位值。
The actual liquid level of the water tank can be obtained by the height of the detection point with the liquid level and the distance h 0 between the detection point and the bottom of the water tank.
法蘭式微壓液位變送器在水箱液位測量設計使用微壓液位變送器的可行性分析
Flange type micro pressure liquid level transmitter in water tank liquid level measurement design feasibility analysis of using micro pressure liquid level transmitter
為了驗證微壓液位變送器的可行性，特搭建1個實驗平臺，實驗平臺信號采集原理如圖2所示。采用側壁安裝的方式在同一高度安裝3塊不同精度的微壓液位變送器（實質為壓力變送器），在水箱頂部安裝1塊投入式液位變送器，采集的信號全部傳輸?shù)娇刂乒?，通過程序運算將壓力變送器采集的數(shù)據(jù)換算成對應的液位值，同時可采用鋼尺測得水箱的實際液位標準值。各變送器對應的液位值可從人機界面上讀取和下載。
In order to verify the feasibility of the micro pressure liquid level transmitter, an experimental platform is built, and the signal acquisition principle of the experimental platform is shown in Figure 2. Three micro pressure liquid level transmitters (essentially pressure transmitters) with different accuracy are installed at the same height by side wall installation. One input liquid level transmitter is installed at the top of the water tank. All the collected signals are transmitted to the control cabinet. The collected data of the pressure transmitter is converted into the corresponding liquid level value by program operation. At the same time, the actual liquid level of the water tank can be measured by steel ruler Standard value. The corresponding liquid level value of each transmitter can be read and downloaded from the human-computer interface.
法蘭式微壓液位變送器在水箱液位測量設計使用微壓液位變送器應用的優(yōu)缺點
Flange type micro pressure liquid level transmitter in water tank liquid level measurement design advantages and disadvantages of using micro pressure liquid level transmitter
華恒變送器廠家研發(fā)出傳感器和智能電路板兩項核心技術，不僅所有產品的核心部件技術全部掌握，工業(yè)自動變送器廠家的精確度也在不斷提高，由0.2級提高到0.1級。還可通過對所掌握核心技術進行延伸，變形出測流量、測溫度的其他產品。
Huaheng transmitter manufacturers have developed two core technologies, sensor and intelligent circuit board. Not only do they master all the core component technologies of all products, but also the accuracy of industrial automatic transmitter manufacturers is constantly improving, from level 0.2 to level 0.1. Through the extension of the core technology, other products for measuring flow and temperature can be deformed.
綜合考慮以上數(shù)據(jù)分析結果及實際應用需要，采用法蘭式微壓液位變送器的方式測液位，其優(yōu)缺點如下：
Considering the above data analysis results and practical application needs, the flange type micro pressure liquid level transmitter is used to measure the liquid level. Its advantages and disadvantages are as follows:
法蘭式微壓液位變送器在水箱液位測量設計使用.1 優(yōu)點
Flange type micro pressure liquid level transmitter is used in water tank liquid level measurement design. 1 advantages
（1）測得的液位值受水流沖擊影響小，準確性和穩(wěn)定性高。
(1) The measured liquid level is less affected by the impact of water flow, and has high accuracy and stability.
（2）采用水箱側壁的安裝方式，便于檢修和維護。
(2) The side wall of the water tank is installed for easy maintenance.
（3）同精度等級的微壓液位變送器比投入式液位變送器成本低。
(3) The cost of the micro pressure liquid level transmitter with the same accuracy level is lower than that of the input liquid level transmitter.
法蘭式微壓液位變送器在水箱液位測量設計使用.2 缺點
Flange type micro pressure liquid level transmitter is used in water tank liquid level measurement design. 2 disadvantages
若直接采用壓力變送器測液位，則需要在系統(tǒng)程序中增加壓力值向液位高度值換算的計算步驟，并考慮安裝高度值H 0 ；若采用自帶換算功能的壓力變送器（顯示液位高度值）測液位，則無需換算步驟，但仍需要考慮安裝高度值H 0 。
If the pressure transmitter is directly used to measure the liquid level, the calculation steps of pressure value conversion to liquid level height value need to be added in the system program, and the installation height value h 0 needs to be considered; if the pressure transmitter with its own conversion function (display liquid level height value) is used to measure the liquid level, the conversion steps are not needed, but the installation height value h 0 still needs to be considered.
微壓液位變送器的應用，在擁有核心電路板設計生產技術和金屬電容是傳感器自主研發(fā)生產為核心的技術,可以從根本上解決傳統(tǒng)投入式液位變送器監(jiān)測數(shù)值波動大造成的不準確和檢修維護困難的問題。雖然需要通過控制程序對監(jiān)測數(shù)值進行換算，但對于工程單位而言，只需統(tǒng)一安裝尺寸和標準，便可解決這一問題。液位變送器作為二次供水控制系統(tǒng)的關鍵部件，此種監(jiān)測方式的變更對于保證二次供水系統(tǒng)的穩(wěn)定運行具有重要的意義。在二次供水日趨智能化的今天，保證監(jiān)測液位數(shù)據(jù)的準確性和穩(wěn)定性是必然的要求，
The application of micro pressure liquid level transmitter, with the core circuit board design and production technology and metal capacitance as the core technology of sensor independent research and development and production, can fundamentally solve the problems of inaccuracy and maintenance difficulties caused by large fluctuation of monitoring value of traditional input liquid level transmitter. Although it is necessary to convert the monitoring value through the control program, for the engineering unit, it can be solved by unifying the installation dimension and standard. As the key part of the secondary water supply control system, the change of this monitoring mode is of great significance to ensure the stable operation of the secondary water supply system. With the secondary water supply becoming more and more intelligent, it is necessary to ensure the accuracy and stability of monitoring liquid level data,