Self operated blowing device flow meter liquid level control

Blowing device flowmeter

Overview：

The secondary scanning device flowmeter adopts a metal tube rotor flowmeter or a glass rotor flowmeter combined with a constant flow valve to form a flow blowing device, which realizes flow measurement and ensures constant flow output. It can be widely used in industries such as petroleum refining, ethylene, fertilizer chemical, steel, chemical fiber textile, etc. for transmitter blowing, differential pressure liquid level measurement and other process control.

Modify the design structure of the series products to meet industrial control requirements, and install applicable clauses that comply with the requirements and specifications of instrument measurement technology.

working principle

Blowing device flowmeter, self operated constant pressure regulator

According to the schematic diagram of the measurement structure (taking constant inlet pressure as an example), it can be seen that

The upward force acting on the elastic membrane is:P2A+P1a. .................(1)

The upward force acting on the elastic membrane is:P3A+P2a+F...............(2)

When the pressure is in equilibrium, that is:（1）=（2）WhenP2A+P1a=P3A+P2a+F.............(3)

Differential pressure as a pressure regulator diaphragmP2-P3We can obtain the following equation:P2-P3=F/A-a/a(P1-P2). ....(4)

Due toa＜Asoa/A(P1-P2)Can be ignored, due toFandAThey are all constant values, so:C(Constant value)=P2-P3When the measuring medium is an incompressible liquidERThe pressure regulator can be applied to changes in outlet pressure.

For（4）In the formula, due toP1Is constant,P3Due to the changes, therefore,P3Become:P3+△P，P2change intoP2+△PSoC(Constant value)=P2-P3

feature

Blowing device flowmeter, self operated constant pressure regulator

The blowing device can be selected in single channel, dual channel, or multi-channel forms

Installation options include single meter installation, panel installation, and cabinet installation

Connection methods are optional, such as thread, sleeve, flange, etc

The diameter of the pipe is optional,6,8,10，15,25mm

Switch signal output and4-20mARemote signal output

The metal structure is simple, beautiful, generous, and sturdy

Can measure process temperature below200The medium and pressure at ℃ should not exceed6.4Mpa

Flow pressure can be selected, and on-site indication adoptsLZThe series float flowmeter can be equipped with precision micro valves, which are convenient, flexible, and easy to adjust flow control on site

Technical Specifications

Selection code

Overall dimensions

Typical Applications

1Application under changing gas pressure conditions

The gas provided by the main pipeline is divided into multiple branches according to demand. If the gas flow rate of several branches is closed or adjusted, the gas supply pressure of the main pipeline will immediately change. The single path blowing device installed on the branches can accurately measure and maintain the stability of the output flow rate.

2Application of Liquid Level Gauge Measurement under Changes in Mouth Pressure

fromAWhen a gas with a constant flow rate is introduced, the gas will be discharged and inserted into the liquid pipeline to form stable bubblesA,BThe pressure inside the conduit andBThe liquid pressure at the end outlet is equal.

Installation precautions

Please choose a suitable installation location for the purging device to ensure that the flowmeter purging device is easy to debug, clean, and disassemble.

The magnetic coupling transmission system used in the metal tube float flowmeter blowing device should ensure that the working equipment is used without interference from magnetic fields to avoid affecting measurement accuracy and precision.

To ensure the stability of the flowmeter blowing device during installation, a bracket should be installed at a suitable location for fixation

The installation size should not exceed the given size to avoid tensile and compressive forces acting on the blowing device.

When measuring the presence of ferromagnetic particles in the medium, a magnetic filter should be installed at the inlet to avoid clogging the instrument.

It is necessary to ensure that the flow direction of the medium is consistent with the requirements of the flowmeter blowing device. When installing the instrument, all micro valves should be closed.

Before putting into operation, the pipeline needs to be emptied and blown clean to avoid the impact force. The valve should be slowly opened and adjusted to the working pressure. The flow rate should be changed by adjusting the valve opening to prevent the float from being impacted and damaging the measuring components.

Please contact our factory promptly if there are any technical issues during use.