The cross section of air flow measuring apparatus

Productoverview:

ZW-HJM series The cross section of air flow measuring apparatus Is a new type. It is measured by the closed pipeline (circular, rectangular or other special-shaped pipe) cross section measuring device measuring section area and the area of the fluid through the axial mean velocity, according to the measured cross-section shape and size is different in its internal structure, multiple unique pitot tube installation. The average pressure differential pressure, so as to get traffic.

The cross section flow meter can be used for a variety of wind volume measurement of power plant boiler duct and outside, can be used to measure the volume of various fan and other places of the gas flow measurement.

The cross section flowmeter manufactured by GB/T2624-2006 and GB1236-2000 according to the JJG835-93 design, verification, without calibration.

Two, work principle:

ZW-HJM series of cross section of air flow measurement device in a straight pipe and sufficient air flow distribution has certain regularity under the premise, if the pipeline flow rate is stable, the exact form in the pipe flow distribution is equal to zero since the wall changes continuously to the center of the pipe flow zui. It can always find a point in the middle of the process of change, measured at this point is the average velocity of flow. But in the actual work site, because the straight section limit flow pipe is not evenly distributed, the actual wind speed distribution is not a rule, but can measure velocity of cross section is divided into many small unit area of Ai. Assume that each unit area of the flow rate was Vi, the total flow rate is equal to the flow through all of a plurality of small unit area traffic and. That is:

This method is called the velocity area method. This method has been widely used in the international organization for standardization, and formulate the corresponding measurement standard. When the unit to divide the area more, the flow rate should be more accurate. The cross section measuring device type flowmeter, is designed based on this principle, has been proved in the practical application.

Three, main features:

1, the flow rate of each point on the pipe cross section measuring device is not constant, but it is stable. Harsh environment applications installed in the pipeline by the flow regulator, placed in the upstream speed measuring device.It is in the same length, the unsteady fluid into a bunch of stable fluid, so as to make accurate measurements.

2, because the pipe cross section measuring device of the points on the flow rate is not equal, the numerical requirements of sensor measured as close to the average. In the structure to produce the velocity and the average. Multi point automatic detection probe in accordance with the principle of balancing the pitot tube, to detect air static pressure and total pressure.

3, does not need the straight pipe section, as long as there is 250 ~ 300mm long installation location.

4, the measurement of gas flow angle of 30 degrees, the irregular fluid, and even influence the multidirectional rotating flow.

5, do not need to field calibration, i.e. the flow coefficient K=1.

6, the pressure loss is very small.

7, positive pressure and static pressure holes are hole flow direction, greatly reduce the possibility of blockage.

Four, technical parameters:

1, pipe shape: rectangular and circular shaped pipe.

2, accuracy: 1%, 1.5%

3, repeat: + 1%

4, diameter: 50 = D = 5000mm

5, working temperature: -50 to 450 DEG C

6, working pressure: 0 ~ 16Mpa

7, standard: GB/T2624-2006, GB1236-2000 and JJG835-93

8, connection: flange connection, welding

9, the gas flow rate must be greater than 4m/s

Five, structure:

The cross section flow meter according to the pipeline form is divided into: circular pipe structure, rectangular pipe structure. At the same time divided into rectifier cascade and cascade rectifier. The specific structure below:

ZW-HJM type cross section duct type flowmeter, its shape and size of the wind pipe is exactly the same, the two ends of circular or rectangular flange, flange and pipe can be connected by.

Seven, the selection of encoding:

Types of marking method:

ZW-HJM-DN - -PN - C/S/O - cross section of air flow sensor

ZW - - HJM - basic model; cross section air flow sensor

DN - - nominal diameter (mm) such as DN1000, nominal diameter 1000 mm.

PN - - nominal pressure (Mpa) such as PN0.1, for the nominal pressure of 0.1 Mpa.

C/S/O pipe material: C steel, S stainless steel, O and other materials.

Eight, design selection and ordering information:

1, the measured medium;

2 commonly used, and the flow rate (m3/h);

3, working pressure (Mpa), temperature (c), Z (Mpa), Z high pressure high temperature (C);

4, medium density and viscosity;

5, pipe material, diameter, diameter;

6, field piping and local resistance piece.

7, you need to display instrument Zhongwei control, please refer to the corresponding instructions, the appropriate choice of models or provided by the technical personnel of our company according to your information for your selection.

8, if there are special to show, please contact our sales department.

Customer service service commitment:

1, our series of flowmeter series product quality problems occur in less than twelve months, is responsible for free repair.

2, the warranty period if the products of our company have any quality problems, our company is responsible for free repair or replacement.

3, the warranty period if the user use undeserved, cause damage to the product, our company is responsible for the maintenance, collect the damaged parts cost.

4, the warranty period after the product quality problems, our company is responsible for the maintenance, collect the damaged parts cost.

5, if the user needs to our service, our company in the province of the user service personnel arrived at the scene within 12 hours, arrived at the scene 48 hours outside users.