Sanitary vortex flowmeterSuitable for the food and hygiene industries, with clamp connections for easy cleaning and installation.

Sanitary vortex flowmeterThe flowmeter housing is made of 316L stainless steel, and can also be customized with 316/304 stainless steel according to needs.

Sanitary vortex flowmeter:There are on-site display type, pulse output type, battery powered type, 485 communication output type, online voltage stabilization compensation type, electric remote transmission type, etc., which can be selected according to your own needs.

The price of flow meters varies with the selection specifications, caliber, and configuration, and is not a fixed price product. It needs to be selected and quoted according to your operating conditions

Sanitary vortex flowmeterCommon model: HVS-KG25O11U
Model annotation: Vortex flowmeter, sanitary type, medium is gas, DN25， The flowmeter housing is made of 316L stainless steel, with a medium temperature of room temperature and a rated pressure of 1.6MPa; On site display of instantaneous flow and cumulative flow, 4-20mA output, 24V power supply.

vortex streetflowmeterProduct shooting:

Required parameters for selection:

Name and composition of the tested medium; Minimum, common, and maximum flow rates under working conditions, minimum, common, and maximum pressure and temperature of the medium, pipeline material, pipeline inner diameter, display mode, and signal output configuration.

Flow range and commonly used density reference:

Working principle

If a non streamlined vortex generator (flow resistant fluid) is set up in the fluid, two columns of regular vortices are alternately generated from both sides of the vortex generator. This type of vortex is called a Karman vortex street, as shown in Figure (1).

Figure (1)

The vortices are arranged asymmetrically downstream of the vortex generator. Assuming the frequency of vortex occurrence is f, the average velocity of the incoming flow of the measured medium is V, the width of the upstream face of the vortex generator is d, and the diameter of the body is D, according to the principle of Karman vortex street, the following relationship is obtained:

Formula (1) for f=StV/d

In the formula:

F - frequency of Karman vortex generated on one side of the body

St Strouhal number (dimensionless number)

V - Average flow velocity of fluid

D - width of vortex generator

From this, it can be seen that the instantaneous flow rate can be calculated by measuring the separation frequency of the Karman vortex street. Among them, Strouhal number (St) is an dimensionless unknown variable,

Figure (2) shows the relationship between Strouhal number (St) and Reynolds number (Re).

In the straight part of the curve table with St=0.17, the frequency of vortex release is proportional to the flow velocity, which is the measurement range of the vortex flow sensor. As long as the frequency f is detected, the flow velocity of the fluid inside the pipe can be obtained, and the volumetric flow rate can be calculated from the flow velocity V. The ratio of the measured number of pulses to the volume is called the instrument constant (K), as shown in equation (2)

K=N/Q (1/m ³) formula (2)

In the formula: K=instrument constant (1/m ³).

N=number of pulses

Q=Volume flow rate (m ³)

Specification

Installation design of instruments

The correct installation of instruments is an important part of ensuring their normal operation. If not installed properly, it can affect the accuracy of instrument use, and in severe cases, it can affect the service life of instruments and even damage them.

（1） Installation environment requirements:

1. Try to avoid strong electrical equipment, high-frequency equipment, and strong switching power supply equipment as much as possible. The power supply of the instrument should be separated from these devices as much as possible.

2. Avoid direct effects from high-temperature heat sources and radiation sources. If installation is necessary, insulation and ventilation measures must be taken.

3. Avoid high humidity and strong corrosive gas environments. If installation is necessary, ventilation measures must be taken.

4. Vortex flow meters should be avoided from being installed on pipelines with strong vibration as much as possible. If installation is necessary, pipeline fastening devices must be installed at 2D upstream and downstream locations, and anti vibration pads must be added to enhance the anti vibration effect.

5. It is recommended to install the instrument indoors and pay attention to waterproofing when installing outdoors. Special attention should be paid to bending the cable into a U-shape at the electrical interface to prevent water from entering the amplifier housing along the cable.

6. There should be ample space around the instrument installation point for wiring installation and regular maintenance.

（2） Installation requirements for instrument pipelines:

1. Vortex flowmeter has certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the flow field of the medium in the pipeline and affect the measurement accuracy of the instrument. The length requirements for the upstream and downstream straight pipe sections of the instrument are shown in Figure (III)

Note: The regulating valve should not be installed upstream of the vortex flowmeter as much as possible, but should be installed at 10D downstream of the vortex flowmeter.

1. The inner diameter of the upstream and downstream piping should be the same. If there is a difference, the inner diameter Dp of the piping and the inner diameter Db of the vortex instrument body should meet the following relationship

0.98Db≤Dp≤1.05Db

The upstream and downstream piping should be concentric with the inner diameter of the flow meter body, and the different axial degrees between them should be less than 0.05Db

The sealing gasket between the instrument and the flange should not protrude into the pipe during installation, and its inner diameter should be 1-2mm larger than the inner diameter of the body

3. Installation design of pressure and temperature measuring holes. When temperature and pressure transmitters need to be installed on the tested pipeline, the pressure measuring hole should be set at 3-5D downstream, and the temperature measuring hole should be set at 6-8D downstream, as shown in Figure (7). D is the gauge diameter of the instrument, unit: mm

4. Instruments can be installed horizontally, vertically, or diagonally on pipelines.

When measuring gas, instruments should be installed in vertical pipelines with no restrictions on gas flow direction. But if the pipeline contains a small amount of liquid, in order to prevent the liquid from entering the instrument measuring tube, the airflow should flow from bottom to top, as shown in Figure (4a)

When measuring liquids, in order to ensure that the tube is filled with liquid, instruments should be installed in vertical or inclined pipelines to ensure that the direction of liquid flow is from bottom to top. If the pipeline contains a small amount of gas, in order to prevent gas from entering the instrument measuring tube, the instrument should be installed at a lower part of the pipeline

As shown in Figure (4b)

When measuring high and low temperature media, attention should be paid to insulation measures. The high temperature inside the converter (inside the header housing) should generally not exceed 70 ℃; Low temperature can easily cause condensation inside the converter, reducing the insulation impedance of the printed circuit board and affecting the normal operation of the instrument.

Real photos of products in the same series:

(On site display type)

(Clamping type complete set of configuration)

(Sanitary type)

(Flange type)

(High temperature type)

(Online voltage stabilization compensation type)

(Different calibers)

(Anti corrosion type)

(Split type voltage stabilization compensation)

(Insertion type)

After sales and warranty