What is the small circuit containing the flowmeter in the drawing and what is its function?

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1. Detailed explanation of the steps for using the Rosemount U-shaped flowmeter

The use of the Rosemount U-shaped flowmeter requires strict adherence to the installation, operation, and maintenance procedures to ensure measurement accuracy and long-term stability of the equipment. 1. Before installation, it is necessary to thoroughly clean the pipeline to prevent impurities such as iron filings from entering the U-shaped pipe. The selection of installation location is crucial, ensuring that the tested medium can fully fill the pipeline, with priority given to horizontal pipelines; If installed in a vertical pipeline, the fluid should flow from bottom to top, and an appropriate straight pipe length should be left at the outlet. At the same time, the installation location should be away from external magnetic fields. If unavoidable, necessary measures should be taken. The method of connecting the wax socks can be selected according to the needs, including flange connection, threaded connection, or clamp type. 2. Flow meter installation 2.1 When measuring gas in the direction of the U-shaped tube, the U-shaped tube must be installed facing upwards to prevent errors caused by gas accumulation; When measuring liquids, it is necessary to ensure that the liquid is filled in the pipeline and there are no bubbles. The installation direction must be consistent with the arrow direction marked on the flowmeter housing to ensure the correct fluid flow direction. 2.2 Ensure that the length of the straight pipe section. The upstream end of the sensor should have a straight pipe section at least 20 times the nominal diameter length, and the downstream end should not be less than 5 times to ensure a stable flow field. The inne

r wall of the pipeline should be smooth and clean, without defects such as dents or scale deposits. 2.3 Control vibration and support pipeline. The flowmeter should be installed on a non vibrating pipeline, and when installed horizontally, the front and rear pipeline supports should be reinforced to prevent deformation; Mass flow meters with a diameter greater than or equal to 80mm should be supported. For media with high viscosity or containing solid particles, vertical installation (flowing from bottom to top) is preferred to reduce impurity deposition; When measuring volatile liquids, the pressure at the outlet of the flowmeter should be higher than the saturated vapor pressure of the liquid, and it should not be installed on the inlet pipeline of the pump; If the tested liquid may contain gas, a deaerator should be added. In order to avoid affecting normal transportation during maintenance, a bypass pipeline should be installed outside the straight pipe sections at both ends of the sensor. When installing sensors outdoors, waterproof treatment should be done for the amplifier plug; The wiring between sensors and display instruments should be selected according to the power supply of the amplifier. For details, please refer to the "User Manual". If the fluid is unstable and there is pulsating flow during use, a buffer should be installed first to eliminate pulsation. When using, first slowly open the control valve on the upstream pipeline of the flowmeter, and then adjust the flow rate with a regulating valve to avoid sudden opening causing the float to rise and damage the cone tube. After opening Haoshan, observe the display of the flowmeter to ensure that it is normal and the measurement data is reasonable. At the s

What is the small circuit containing the flowmeter in the drawing and what is its function?

1. Detailed explanation of the steps for using the Rosemount U-shaped flowmeter

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