法兰式微压液位变送器在水箱液位测量设计使用
Design and application of flange type micro pressure liquid level transmitter in water tank liquid level measurement
华恒变送器厂家凭借自身拥有的传感器和智能电路板核心技术，可以根据客户要求，低成本对核心技术进行延伸变形，实现个性化产品定制。主要产品有SMART（斯玛特）系列压力变送器、多参数变送器、流量器、温度传感器和物位（液位变送器厂家，为我国电力、石油、化工、冶金、水泥、矿业等行业提供了高性能价格比的工业自动变送器厂家产品.
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
微压液位变送器的原理
Principle of micro pressure liquid level transmitter
微压液位变送器其实质是采用压力变送器来间接地测液位，如图1所示。实际上，压力变送器安装在水箱距底部一定高度的侧面，根据帕斯卡定律，其探头检测到的实质是检测点处的压强值。水箱侧壁处检测点的压强同该点至液面的高度存在以下关系：
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为检测点距液面的高度（m）；P为检测点的压强（Pa）； ρ 为液体的密度（kg/m 3 ）；g为重力加速度（m/s 2 ），取9.8。通过对检测点压强值的换算即可得到当前
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
检测点同液面的高度值，再加上检测点距水箱底的距离H 0 即可得到水箱的实际液位值。
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.
法兰式微压液位变送器在水箱液位测量设计使用微压液位变送器的可行性分析
Flange type micro pressure liquid level transmitter in water tank liquid level measurement design feasibility analysis of using micro pressure liquid level transmitter
为了验证微压液位变送器的可行性，特搭建1个实验平台，实验平台信号采集原理如图2所示。采用侧壁安装的方式在同一高度安装3块不同精度的微压液位变送器（实质为压力变送器），在水箱顶部安装1块投入式液位变送器，采集的信号全部传输到控制柜，通过程序运算将压力变送器采集的数据换算成对应的液位值，同时可采用钢尺测得水箱的实际液位标准值。各变送器对应的液位值可从人机界面上读取和下载。
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.
法兰式微压液位变送器在水箱液位测量设计使用微压液位变送器应用的优缺点
Flange type micro pressure liquid level transmitter in water tank liquid level measurement design advantages and disadvantages of using micro pressure liquid level transmitter
华恒变送器厂家研发出传感器和智能电路板两项核心技术，不仅所有产品的核心部件技术全部掌握，工业自动变送器厂家的精确度也在不断提高，由0.2级提高到0.1级。还可通过对所掌握核心技术进行延伸，变形出测流量、测温度的其他产品。
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.
综合考虑以上数据分析结果及实际应用需要，采用法兰式微压液位变送器的方式测液位，其优缺点如下：
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:
法兰式微压液位变送器在水箱液位测量设计使用.1 优点
Flange type micro pressure liquid level transmitter is used in water tank liquid level measurement design. 1 advantages
（1）测得的液位值受水流冲击影响小，准确性和稳定性高。
(1) The measured liquid level is less affected by the impact of water flow, and has high accuracy and stability.
（2）采用水箱侧壁的安装方式，便于检修和维护。
(2) The side wall of the water tank is installed for easy maintenance.
（3）同精度等级的微压液位变送器比投入式液位变送器成本低。
(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.
法兰式微压液位变送器在水箱液位测量设计使用.2 缺点
Flange type micro pressure liquid level transmitter is used in water tank liquid level measurement design. 2 disadvantages
若直接采用压力变送器测液位，则需要在系统程序中增加压力值向液位高度值换算的计算步骤，并考虑安装高度值H 0 ；若采用自带换算功能的压力变送器（显示液位高度值）测液位，则无需换算步骤，但仍需要考虑安装高度值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.
微压液位变送器的应用，在拥有核心电路板设计生产技术和金属电容是传感器自主研发生产为核心的技术,可以从根本上解决传统投入式液位变送器监测数值波动大造成的不准确和检修维护困难的问题。虽然需要通过控制程序对监测数值进行换算，但对于工程单位而言，只需统一安装尺寸和标准，便可解决这一问题。液位变送器作为二次供水控制系统的关键部件，此种监测方式的变更对于保证二次供水系统的稳定运行具有重要的意义。在二次供水日趋智能化的今天，保证监测液位数据的准确性和稳定性是必然的要求，
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,