Note on the selection of accessories in the selection of vortex flow meter
In the selection process of the vortex flow meter, in addition to the selection of a high-precision type in a comprehensive consideration of the demand, other accessories of the vortex flow meter are also very important, such as the selection of flow transmitters and the selection of compensatory pressure transmitters.
1. Measurable media
When measuring medium flow rate, instrument range and aperture measurement of general media, the full degree flow rate of the vortex flowmeter can be selected in the range of measuring medium flow rate 0.5-12m /s, and the range is relatively wide.
The selection of instrument specifications (caliber) is not necessarily the same as the process pipeline, should be determined according to whether the measured flow range is within the flow rate range, that is, when the pipeline flow rate is low, can not meet the requirements of the flow meter or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the diameter of the instrument, so as to improve the flow rate in the tube, and obtain satisfactory measurement results.
2. Selection of vortex flow transmitter
The VA type piezoelectric vortex flow transmitter is used in the saturated steam measurement. Due to the wide range of the vortex flow meter, in practical applications, the main consideration is that the flow rate of saturated steam measured should not be lower than the lower limit of the vortex flow meter, that is to say, the fluid flow rate must not be less than 5m/s.
According to the size of the amount of steam used, vortex flow transmitters of different calibers can be selected, rather than the existing process pipe calibers.
3. Pressure compensation pressure transmitter selection
Since the saturated steam pipeline is long and the pressure fluctuation is large, pressure compensation must be used. Taking into account the corresponding relationship between pressure, temperature and density, only pressure compensation can be used in the measurement. Because the saturated steam pressure of the pipeline is in the range of 0.3-0.7MPa, the measuring range of the pressure transmitter can be selected as 1MPa.
The above is the selection of accessories in the selection of vortex flowmeter.