主要用于解决高粘度、低雷诺数流体的流量测量，先后经历了气动表和电动表两大发展阶段，SBL系列智能靶式流量计是在原有应变片式靶式流量计测量原理的基础上，采用了最新型电容力传感器作为测量和敏感传递元件，同时利用了现代数字智能处理技术而研制的一种新式流量计量仪表。 The target type flowmeter is mainly used to solve the flow measurement of high viscosity and low Reynolds number fluids. It has experienced two development stages of pneumatic and electric meters. The SBL series intelligent target type flowmeter is measured on the original strain gauge target type flowmeter. Based on the principle, a new type of flow meter is developed using the latest capacitive force sensor as a measurement and sensitive transmission element, and using modern digital intelligent processing technology.
原理：靶式流量计的工作原理是这样的当介质在测量管中流动时，因其自身的动能与靶板产生压差，而产生对靶板的作用力，使靶板产生微量的位移，其作用力的大小与介质流速的平方成正比， Target flowmeter principle: The working principle of the target flowmeter is such that when the medium flows in the measuring tube, due to its own kinetic energy and the target plate, a pressure difference is generated, and the force on the target plate is generated, so that the target plate is generated. For a small amount of displacement, the magnitude of the force is proportional to the square of the velocity of the medium.
Its mathematical formula:
F = Cd · A · ρ · V2 / 2
F: the force on the target
Cd: fluid resistance coefficient
A: The axial projection area of the target plate to the measuring tube
ρ: medium density under working conditions
V: The force applied by the target in the measuring tube with the characteristic flow rate of the medium is transmitted through the target rod to cause a slight change in the sensor's elastomer, which is converted by the circuit to output the corresponding electrical signal.
特点：1、整台仪表结构坚固无可动部件，插入式结构,拆卸方便； 2、可选用多种防腐及耐高低温材质(如哈氏合金，钛等)； 3、整机可做成全密封无死角(焊接形式)，无任何泄漏点，可耐42MPa 高压； 4、仪表内设自检程序，故障现象一目了然； 5、传感器不与被测介质接触,不存在零部件磨损,使用安全可靠； 6、可就地采用干式标定方法，即采用砝码挂重法。 Target type flowmeter features: 1, the entire instrument structure is solid without moving parts, plug-in structure, easy to disassemble; 2, can choose a variety of anti-corrosion and high and low temperature resistant materials (such as Hastelloy, titanium, etc.); The machine can be made fully sealed without dead corners (welding form), without any leakage points, and can withstand high pressure of 42MPa; 4. Self-checking procedures are built in the instrument, and the failure phenomenon is clear at a glance; 5. The sensor is not in contact with the measured medium, and there are no parts Wear, safe and reliable use; 6, can use dry calibration method on the spot, that is, using the weight hanging method. One-button operation can complete the calibration; 7. There are multiple installation methods to choose from, such as the choice of online plug-in, low installation costs; 8. Integrated temperature and pressure compensation, direct output quality or calibration; 9, optional small Signal cutting, non-linear correction, and filtering time can be selected; 10. It can accurately measure the gas and liquid flow under various normal temperature, high temperature 500 degrees, and low temperature -200 degrees; 11. accurate measurement, accuracy can reach 0.2%; 12 Good repeatability, generally 0.05% ~ 0.08%, fast measurement; 13, Small pressure loss, only about 1/2 △ P of standard orifice plate; 14, Anti-interference and anti-impurity ability; 15. Can be according to Actually need to change the choke (target) to change the range; 16. Low-power battery on-site display, can directly read the displayed value online, the display can simultaneously read the instantaneous and cumulative flow and percentage bar graph; 17, simple and convenient installation , Extremely easy to maintain; 18, a variety of output forms, can remotely transmit various parameters; 19, strong anti-vibration, pulsating flow can be measured within a certain range.
由测量装置和力转换器俩部分组成。 The target type flowmeter is composed of a measuring device and a force converter. The measuring device is used to convert the force of the fluid on the target surface into a corresponding displacement. There are two main forms of force converters: force-electric (current) transponders and force-air (pneumatic) converters. Target flowmeters are therefore divided into electric target flowmeters and pneumatic target flowmeters. . The selection of the target type flowmeter is the same as that of the float flowmeter. In addition to considering the accuracy, the nature and state of the measured medium, the range should also be taken into consideration. It must be converted into a standard system according to the actual flow range requirements of the measured fluid under working conditions. Range value. The installation of the target type flowmeter should pay attention to the following issues: 1. There should be an 8D long straight pipe section before the target, and there should be a 5D long straight pipe section after the target. 2. The flow meter is calibrated and adjusted according to the horizontal position, so it is generally installed horizontally, and a bypass pipe is added to adjust and calibrate the zero point of the meter, and it will not affect production when the meter is maintained. If it must be installed on a vertical pipe, pay attention to the flow direction of the fluid from bottom to top; due to the effect of gravity, a zero point drift will occur, so the zero point must be readjusted after installation. 3 During installation, the center of the target must be concentric with the axis of the pipeline.