1. Before selecting a flow meter, determine the type and flow value of the measured medium (which can be estimated), and then select the vortex flow rate according to the corresponding flow range of the vortex flowmeter when measuring different media. Specifications.
2. The measured medium flow in the pipeline must be within the flow range of the flowmeter, otherwise it cannot be used, and it is best to be at 1/2 to 2/3 of the flow range of the flowmeter.
3. If the actual pipe diameter is larger or smaller than the selected flow meter diameter, shrink pipe or expansion pipe should be used to reduce the diameter to ensure the correct use of the flow meter.
4, according to the use of vortex flowmeter selection vortex signal output method:
When the measured medium is a compressible fluid, and the temperature and pressure of the medium vary greatly, it is recommended to use a vortex sensor with pulse signal remote transmission and a flow totalizer with temperature and pressure compensation. Pressure transmitter, temperature transmitter or Pt100, need to be purchased separately.
The flow meter is installed in a room with good environment and no signal is needed for remote transmission. It is only necessary to read the flow value at the site, and the flow meter installation position is convenient for operation and data reading. It is recommended that the user select a battery-powered field-reading vortex street-ready flow. meter. However, if the flow meter is installed outdoors and exposed to the atmosphere, the battery-powered direct-reading vortex flowmeter is generally not selected.
When the installation environment of the flowmeter is poor or the installation location is not convenient to read the flow value or centralized management at the site, it is recommended to use a sensor that outputs pulse signals and a flow totalizer, or a vortex street with a 4~20mA standard current output. Transmitter.
When it is necessary to observe the flow at the same time and transmit the signal remotely at the same time, it is recommended to use the vortex transmitter with 4-20mA output at the same time.
When it is not necessary to read at the scene and only transmit the standard signal far, it is recommended to use a vortex transmitter with a 4 to 20 mA standard current output.
5, according to the temperature of the measured medium, use high temperature or low temperature vortex flowmeter. High temperatures of 250°C-350°C are generally equipped with heat sinks.
6, explosion-proof locations use explosion-proof vortex flowmeter.