Requirements for flow measuring instruments used in process control

Abstract: The required information for flow measuring instruments used in process control is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Flow meters are widely used in process control. The function of flow meters in process control is to detect the fluid flow in the sealed pipeline. If necessary, flow measuring instruments, regulating instruments, actuators, etc. are also formed into a regulating system to stabilize the flow at an appropriate level. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the requirements for flow measurement instruments used in process control. Flow meters are widely used in process control. The function of flow meters in process control is to detect the fluid flow in the sealed pipeline. If necessary, flow measuring instruments, regulating instruments, actuators, etc. are also formed into a regulating system to stabilize the flow at an appropriate level. range to achieve process stability. Flow measuring instruments perform such a specific task in process control and therefore need to meet the following requirements. 1. Stable performance ① The output of the flow measuring instrument should have good stability. If the flow signal itself has noise, it should be adjusted by the damping in the meter to make the indicated value stable enough for easy reading. When forming a regulating system with a regulator, the output of the regulator should have no obvious oscillation. ②The influence of ambient temperature on the value indicated by the flow measuring instrument should be within the specified technical index range. ③The instrument should have good long-term stability. 2. Reliability requirements ① The instrument should have a high degree of reliability. Modern industrial devices tend to be large-scale continuous processes, instrument failures can easily lead to process instability, and once the flowmeter installed on the pipeline fails, it is impossible to The process is specifically stopped for repair, so instrument manufacturing and system design must first consider reliability, including the reliability of the thermal resistance used for temperature compensation. Some meter manufacturers dualize components that are comparatively prone to failure and inconvenient to repair. There are also some manufacturers that have devised a way to replace the sensor under constant flow conditions. Some electromagnetic flowmeter manufacturers provide methods and tools for continuous electrode replacement, which all create good conditions for improving reliability. ②Fault diagnosis. Once the instrument fails, the fault diagnosis part should be able to automatically prompt the fault location and the nature of the fault, so that the maintainer can shorten the troubleshooting time. After the diagnostic information is sent to the computer by the method of digital communication of the instrument, the computer can monitor the operation status of the instrument, send an alarm signal when the instrument fails, display the fault content, and even take necessary safety measures. 3. Strong anti-interference ability ① Anti-vibration interference ability. Most of the flow sensors are installed on the pipeline, and the on-site environmental conditions are relatively harsh, among which the vibration type is a major interference, so the flow sensors, converters, etc. should have strong anti-interference ability. Some vortex flowmeters and Coriolis mass flowmeters are not ideal for use in the field because their anti-vibration interference ability is not ideal.“out of nothing”and“Indication is too high”etc. phenomenon. ② Anti-RF interference ability. There are various sources of interference in the industrial site where the flowmeter is installed, such as driving in the workshop, forklift driving or someone using the walkie-talkie nearby, which will cause the value of some flowmeters to increase. This is because the electrical appliances in the driving , The radio frequency electromagnetic wave emitted by the spark plug of the forklift, and the radio frequency electromagnetic wave emitted by the walkie-talkie antenna enter the instrument through some ways, interfering with its work. In recent years, people have begun to pay more attention to the impact of radio frequency interference. The measuring instrument has added radio frequency interference impact indicators, and taken many measures to improve the anti-interference ability. 4. Short influence time There are many flow measuring instruments and regulators together to form a regulating system, and the response time of flow measuring instruments is required to be within 1s. In the flow constant value adjustment system, if the total time constant of the flow measurement link is greater than 1s, it may have a significant impact on the adjustment quality, and in severe cases, it will cause the system to oscillate and fail to work. 5. Diversity of output signals ①Analog output. The flow measuring instrument should have an analog output of 4~20mA, and should have constant current characteristics. ② Frequency output. The flow transmitter (converter) uses the frequency to transmit the flow signal to the display instrument or regulator, which can basically not lose the accuracy, which is the outstanding advantage of this method. ③Digital output. The communication port of the flow measuring instrument, such as RS485, is connected to the computer. With the support of special software, it can not only transmit various parameters measured by the flow measuring instrument to the computer, but also transmit the fault information and related configuration data and characterize the status of the instrument. The data is transmitted to the computer, and the configuration of the field instrument can be modified in the control room through the computer, and various tasks such as inspection, verification, maintenance and management can be carried out. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Requirements for flow measuring instruments used in process control'

are important in ensuring rosemount coriolis mass flow meter, and the machine is utilised by everyone from vortex flow meter manufacturer to digital fork density meter.

Growing revenue is a common goal for many businesses. We want to be sure Sincerity include leaders from the marketing, sales and production departments to help make certain that the goals we choose are appropriate and have strong support.

mass flow meter has its grasp on oversees market and has a very good repute. Our products are available at very competitive prices.