Toluene flowmeter| gas flow controller

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1. Precautions for turbine flowmeter

Proper selection of turbine flowmeter is necessary to ensure better use of turbine flowmeter. What type of turbine flow meter should be selected based on the physical and chemical properties of the measured fluid medium? What are the diameter, flow range, lining material, electrode material, and output current of the turbine flowmeter? Can adapt to the properties of the measured fluid and the requirements of flow measurement.

1、 The precision level and function of precision function inspection are selected based on measurement requirements and usage scenarios to achieve cost-effectiveness. For example, in situations such as trade settlement, product handover, and energy measurement, higher accuracy levels such as 1.0, 0.5, or higher should be selected; For process control applications, choose different accuracy levels according to control requirements; In some cases where only the process flow rate needs to be detected without accurate control and measurement, a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0, can be selected. In this case, a low-cost plug-in turbine flowmeter can be used.

2、 When measuring medium flow rate, instrument range, and caliber for general media, the full-scale flow rate of a turbine flowmeter can be selected within the range of 0.5-12m/s for measuring medium flow rate, which is relatively wide. The selection of instrument specifications (caliber) may not necessarily be the same as the process pipeline, and should be determined based on whether the measured flow range is within the flow rate range. That is, when the pipeline flow rate is too low to meet the requirements of the flow instrument or the measurement accuracy

cannot be guaranteed at this flow rate, the instrument port diameter needs to be reduced to increase the flow rate inside the pipeline and obtain satisfactory measurement results. In order to ensure the accuracy of the measurement of the turbine flowmeter, the installation position and method must be selected correctly. The requirements for the straight pipe section are as follows: the flowmeter must be installed horizontally on the pipeline (with a pipeline inclination within 5 degrees), and the axis of the flowmeter should be concentric with the axis of the pipeline during installation, and the flow direction should be consistent. The upstream pipeline length of the flowmeter should have an equal diameter straight pipe section of not less than 2D. If the installation site permits, it is recommended that the upstream straight pipe section be 20D and the downstream be 5D. Requirements for piping: The inner diameter of the upstream and downstream piping at the flowmeter installation point should be the same as the inner diameter of the flowmeter. Requirements for bypass pipe: In order to ensure that the maintenance of the flowmeter does not affect the normal use of the medium, shut-off valves (globe valves) should be installed on the front and rear pipelines of the flowmeter, and a bypass pipe should also be installed. The flow control valve should be installed downstream of the flowmeter. When using the flowmeter, the upstream shut-off valve must be fully opened to avoid unstable flow of fluid in the upstream section. Requirements for external environment: It is best to install the flowmeter indoors. If it must be installed outdoors, it must be protected from sunlight and rain Lightning protection measures should be take

Toluene flowmeter

1. Precautions for turbine flowmeter

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