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How to choose a gas vortex flowmeter?
The selection of vortex flowmeter mainly confirms the following parameter requirements:
1. Measurement medium for cavity bending.
. Turbine flowmeter is a type of velocity flowmeter that utilizes the principle of Karman vortex street. When the medium passes through the vortex generator, small vortices are formed behind it. The number of vortices can be converted into the flow velocity of the medium, which in turn can be converted into the flow rate of the medium. Its principle determines the type of measuring medium, which can be liquid, gas, or vapor. At present, the vast majority of industrial applications, such as nitrogen, compressed air, steam, thermal oil, etc., mostly use vortex flowmeters for measurement.2、 Pipeline diameter. Vortex flow meters can be installed in different ways, including pipeline installation and plug-in installation. For pipeline type flow meters, the diameter of the pipeline is the same as most other flow meters. The smaller one is DN15, while the larger one can reach DN300. If a larger caliber is required, plug-in installation can be chosen. The conventional caliber range can reach up to DN2000, and calibers above DN2000 will be supplied according to the agreement.
3、 Measurement accuracy. The accuracy of vortex flowmeter also has several levels, and it is classified according to the measuring medium. The pipeline type vortex flowmeter can achieve a measurement accuracy of 1.0 level for liquids and 1.5 level for gases. If it is an inserted vortex flowmeter, the accuracy can reach levels 1.5 and 2.5.
4、 Medium temperature. Generally speaking, it is divided into three ranges: room temperature, medium temperature,
5、 Nominal pressure. Mainly classified according to installation methods, the main demands in the market are as follows: flange clamping type (2.5MPa), flange connection type (1.0/1.6/2.5MPa), and plug-in installation type (1.6MPa/2.5MPa/4.0MPa).
6、 Power supply. According to the current market demand, there are mainly+12VDC (three wire pulse output),+24VDC (three wire pulse output type and two wire current output type) 3.6V lithium batteries, and dual power supply.
7、 Output signal. According to current market demand, there are mainly voltage frequency pulse output, two-wire 4-20mA output, and HART output. In addition, in some cases, Wu Bian may require digital output, and we can also provide RS485 communication via Modbus.
2. Parameters required for selection of vortex flowmeter
The parameters required for selection of vortex flowmeter are as follows: the name and type of the measured medium should be clearly stated in the measured medium information.
. If the medium is a mixed gas, the volume percentages of each component must be provided, such as the mixing ratio of oxygen and nitrogen, to ensure the adaptability of the flowmeter to the characteristics of the medium. Working pressure: The pressure value of the medium under normal operating conditions. Maximum and minimum pressure: the limit values of medium pressure fluctuations, used to evaluate the pressure resistance range and stability of f
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