Flow Measuring Instruments and Conditioners

The response time requires many flow measuring instruments and regulators together to form a regulating system, and the response time of the flow measuring instruments is required to be within 13. In the flow constant value regulation system, if the total time constant of the flow measurement link is greater than ', it may have a significant impact on the regulation quality, and in severe cases, it will cause the system to vibrate and fail to work. (^) Anti-interference ability requires ① Anti-vibration interference ability. Most of the flow sensors are installed on pipelines, and the on-site environmental conditions are relatively harsh, where vibration is a major disturbance, so flow sensors, converters, etc. should have strong anti-interference ability. Some types of vortex flowmeters and Coriolis mass flowmeters are not ideal for anti-vibration interference, and they are not used well in the field. ② Anti-radio frequency interference ability. There are many sources of interference in the industrial site where the flowmeter is installed, such as driving in the factory building, passing by a forklift, or someone using a walkie-talkie nearby, which will cause the indicated value of some flow measurement indicators to increase. 1. The radio-frequency electromagnetic waves emitted by the spark plug of the forklift and the radio-frequency electromagnetic waves emitted by the antenna of the walkie-talkie enter the surface through certain paths and interfere with its operation. In recent years, people have begun to pay attention to the impact of radio frequency interference, adding radio frequency interference impact indicators to the measuring instrument, and taking many measures to improve the anti-interference ability. Diversity of output signal ① Analog output. Flow measurement surface should have 4〜20 melons and eight analog outputs, and should have constant current characteristics. ② Frequency output. Flow transmitters (converters) use frequency to transmit flow signals to display meters or conditioners with little loss of accuracy. This is the great advantage of this approach. ③ Digital output. flow measurement appearance&3-232, 23-485 and other communication ports are connected to the computer. With the support of special software, not only can the various parameters measured by the flow measurement instrument be transmitted to the computer, but also the fault information, related configuration data, and characterization of the instrument can be transmitted to the computer. The relevant data of the situation is transmitted to the computer, and the configuration of the on-site instrument can be changed in the control room through the computer, and various operations such as inspection, verification, maintenance and management can be performed.

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