Vortex Shedding Flow Meter Selection Guide
When selecting a Vortex Shedding Flow Meter, you mainly need to confirm the following parameter requirements:
- Measurement medium
The vortex flowmeter is a velocity flowmeter that utilizes the principle of Karman vortex. When the medium passes through the vortex generator, small vortices will be formed behind it. The number of vortices can be converted into the flow rate of the medium. Then it is converted into the flow rate of the medium.
Its principle determines the type of measurement medium, which can be liquid, gas or steam. At present, most industrial applications, such as nitrogen, compressed air, steam, thermal oil, etc., are mostly measured by vortex flowmeters. - Pipe diameter
Vortex flowmeters can be installed in pipeline or plug-in types according to different installation methods.
For the pipe type, the pipe diameter is the same as that of most other flow meters. The small one is DN15, and the larger one can reach DN300.
If you need a larger caliber, you can choose plug-in installation. The conventional caliber range can reach DN2000. Calibers above DN2000 are supplied according to the agreement. - Measurement accuracy
The accuracy of vortex flowmeters also has several levels, and they are divided according to the measurement medium.
If the pipe-type vortex flowmeter is measuring liquid, the measurement accuracy can reach level 1.0, and if it is measuring gas, the accuracy can reach level 1.5.
If it is an insertion vortex flowmeter, the accuracy can reach level 1.5 and level 2.5. - Medium temperature
Generally speaking, it is divided into three ranges: normal temperature, medium temperature and high temperature.
The temperature ranges are -40~100℃ (normal temperature), 100~250℃ (medium temperature), and 100~350℃ (high temperature).
If the on-site medium temperature is higher, such as some superheated steam, an orifice flowmeter can be used to measure it. - Nominal pressure
It is mainly divided according to the installation method. The main demand in the market is as follows: such as flange Wafer type (2.5MPa), flange connection type (1.0/1.6/2.5MPa), plug-in installation type (1.6MPa/2.5MPa/ 4.0MPa). - Power supply
Mainly include +12VDC (three-wire pulse output), +24VDC (three-wire pulse output type and two-wire current output type), 3.6V lithium battery, and dual power supply. - Output signal
Mainly include voltage frequency pulse output, two-wire 4-20mA output and HART output.
In addition, some occasions may require digital output, and we can also provide RS485 communication via modbus.
What is the pressure drop on a vortex shedding flow meter?
Pressure loss, also known as pressure drop and pressure loss, is a technical and economic indicator indicating the amount of energy consumed by a flow meter. It is expressed by the total pressure difference of the fluid at the inlet and outlet of the flow meter. It essentially reflects the mechanical energy consumed by the medium passing through the flow meter.
Causes of pressure loss in vortex flowmeters
1. The medium flows through the vortex flowmeter to form a dead water area or vortex area. The medium does not participate in the main flow in this area, but continuously swirls, accelerates friction, causes particle collision, and causes local energy loss;
2. When the medium flows through the vortex flowmeter, the size and direction of the flow velocity change drastically. The velocity distribution pattern on each section also changes constantly, causing additional friction and consuming energy.
