Pitot tube flowmeter

Products overview:

ZW series of BTGPitot tube flowmeterIs a kind of medium pipeline flow velocity at the centre of the principle of pitot tube flowmeter, in scientific research, production, teaching, environmental protection and clean rooms, mine ventilation, energy management, commonly used pitot tube measurement of air velocity in the piping wind speed, furnaces flue, after conversion to determine the flow rate, measurement of flow velocity in the pipe.Using pitot tube speed and determine traffic, according to have reliable theory, easy to use, accurate, is a kind of classic wide measuring method.In addition, it also can be used to measure the pressure of the fluid.It is widely used in gas, steam and liquid flow measurement.

Second, the working principle:

ZW series - BTG pitot tube flowmeter is a kind of design on the basis of the principle of pitot velocity-equalizing tube flowmeter, it produces a flow with direct ratio of the square of the average differential pressure (DP).In order to generate and flow proportional electrical signal, usually the DP output voltage signal with a guide tube coupled to the differential pressure transmitter.

Flow calculation formula:

Respectively, mass flow (㎏ / s) and volume flow (m3 / s);

- the average flow velocity;

- meter coefficient;

- flow coefficient;

-- the expansion coefficient;

- pipe diameter, m;

- the flow volume density, ㎏ / m;

-- differential pressure, Pa;

Applications:

ZW series - BTG pitot tube flowmeter can be used for various size of pipe diameter in gas, liquid and steam flow detection, the object of a typical use of natural gas, coal gas, gas, hydrocarbon gas, crude oil, high and low pressure steam, acid gases, CO.Gas, nitrogen, compressed air, and water.Water, waste water, liquid oxygen, alcohol, nitric acid, etc.

Four, the main features:

Is critical to the success of the pitot tube by calibration, the piecewise corrected.Is unmatched by other meter universal meter.

1, strong applicability: sensor for all kinds of fluid and a variety of pipe form, is a kind of components of domestic and international * can do all kinds of fluid flow measurement.

2, high precision, in the range of 3% ~ 99% range accuracy is 0.2%.

3, to save energy: pitot tube sensor intercepting area is very small, almost no pressure loss, operation cost is reduced greatly.By the national development and reform commission energy conservation information dissemination center recommended for 61 energy-saving products.

4, installation is simple: only in a position to open a suitable pipeline 25 ~ 60 mm hole, the sensor can be inserted into the pipe center.

5, easy maintenance: sensor itself without maintenance.Just for differential pressure transmitter zero and full range of inspection and the second table corresponding input current regular inspection.

6, reliability, simple structure, reasonable design.Because the guide medium pressure tube dormant for a long time, so the measurement precision can remain stable for a long time.

7, resistant to high temperature and high pressure: as the sensor with 1 cr18ni9ti, therefore can resistance to high temperature of 650 ℃, pressure 32 mpa.(special sensor can be made of material resistant to high temperature 1700 ℃)

8, wide range of measuring flow rate, gas flow rate in more than 1 m/s, liquid flow rate in more than 0.1 m/s can accurately measure the medium.For low velocity, small flow rate, large diameter measurement effect is a plus.

9, online installation and maintenance: no production under the condition of installation and maintenance.

Five, the technical parameters:

1, specifications: (- DN5000 (mm);Insert: DN500 - DN5000 (mm);

2, the measurement accuracy: + / - 6.0%;Repeatability: + / - 0.1%;

3, scope: volume flow: 10:1;Mass flow rate: 8;

4, work stress: velocity-equalizing tube without functional: 20 mpa or less;Velocity-equalizing tube can be put forward: 10 mpa or less;

5, fluid temperature: 450 ℃ or less;

6, medium viscosity: 30 or less cp (crude oil).

Six, pitot tube flow sensor plug design:

Pitot tube flow probe's unique design thoroughly get rid of the pig and past several average probe easily blocked, the characteristics of accuracy is not high, make a source of measurement accuracy, repeatability and reliability to a new height.

Just when switched on, the fluid in the pipeline under the action of static pressure, into the pipe bending, quickly formed a pressure balance state.When pressure balance formation fluid in high pressure pipe inlet, detour, no longer into the bend.

Pitot tube flow sensor of high, low pressure hole held in nature

In general, dust, sａnd and particles under the action of the vortex street force, concentrated in the very back of the probe.This is why the autumn leaves are always in the leeward behind the house.Probe flowmeter probe held in unique design, coupled with the nature of gravity whereabouts, prevents the particles into, this design essentially prevent the congestion and can create a very stable low voltage signal.

Continuous work of the pitot tube fundamentally eliminate the possibility of the wall, but in the following cases, still should pay attention to prevent:

1, when the pressure pipe leaking, probe high pressure balance to destruction of impurities in the diameter of the smaller particles are likely to enter the hole.

2, when the pipeline was shut down, because of the brown movement of molecules, small particles of impurities may enter the hole.

3, and frequent system key, formed in high, small particles of impurities may enter the hole, accumulate over a long period, it is possible to probe the jam.

4, medium contains a large number of biological species, or containing fibrous material, may also cause the probe of the jam.

Seven, form a complete set of scheme selection:

1, is according to the measured medium, and the user use the pipe inner diameter, working temperature, working pressure and flow design and production.

2, ZW - 3051/1151 dp series differential pressure transmitter or other types of differential pressure transmitter

3, ZW - 308 series pressure transmitter, or other type of pressure transmitter

4, temperature transmitter, or other type of temperature transmitter

5, ZW - XMJA series or other types of flow totalizer.especially flow integrating instrument

Of 6, so intelligent, pitot tube flowmeter with temperature pressure compensation, and can show the instantaneous flow and cumulative flow medium medium temperature, the pipe, the pipe pressure and differential pressure equivalent, equipped with communication interface and 4 ~ 20 ma output.

Eight, device:

1, velocity-equalizing tube flow sensor 1;

1 2, velocity-equalizing tube flow sensor operating instructions;

3, 1 certificate;

4, form a complete set of transmitter instrument and manual and certificate of approval (which can be ordered by the users themselves).

Nine, use requirements:

1, the current body shall be full of pipe flow and stability.

2, the fluid being measured should be single phase, the phase constant, for

Components of complex fluid must be similar to a single component of fluid can be used.

3, the current body under actual conditions of ReD should be greater than 3 x 104

4, should guarantee the sensor before and after the straight pipe length requirements.

5, pipe diameter greater than 100 ㎜ as well.

6, 2 d in front of the sensor on the surface of the pipe, should be clean and smooth.

Ten, in the long-term practice in the process of problem solving:

1, solve the measurement of the electric power industry a wind speed, and blockage of the air flow sensor, the wear problem.

2, solve the main steam measurement problems such as high temperature, high pressure, high flow velocity.

3, solve the measurement problem of various kinds of gas sensor when knick-knack hanging dirt.

4, solves the ultra small diameter and large diameter (5 mm - 20000 mm), small flow and low velocity is difficult to measure.

5, achieved with the open hole, online installation.

6, has realized the online dredge, on-line cleaning.

7, which can measure all kinds of pipe (square, rectangle, diamond, trapezoid, oval, triangle and other pipeline).

8, implements the various detection device can test.

9, realized the high viscosity medium (measurement) of crude oil, tar, heavy oil, etc.

The measurement of insufficient 10, implements the straight pipe.

Eleven, product maintenance instructions:

Pitot tube sensor should be regular cleaning when process piping overhaul, there are a number of ways for cleaning, such as air blow test tube accumulated filth;Scrub with kerosene and soft silk net, make each hole to maintain patency.May produce the cause of the failure and remove methods: serial number of failure causes clear way.

1, differential pressure signal output: high and low pressure valve is not open, open the high and low pressure valve.

2, high and low pressure balance valves did not tighten, tighten balance valve.

3, differential pressure signal output is too small, pressure system has a leak phenomenon;Seriously looking for, eliminate the leakage.

4, improper secondary table range selection: uninteresting facts limit pressure transmitter.

5, differential pressure signal output is too large, secondary table range matching is undeserved, augmenting the upper limit, differential pressure transmitter back-pressure aperture jams, cleaning velocity-equalizing tube, eliminate congestion.

twelve, the selection of code:

Model tag method: ZW - BTG - DN / Pitot tubeFlow sensor
DN - - (㎜) such as DN500 nominal diameter of 500 ㎜ nominal diameter.

13, design selection and order notes:

1, the name of the measured medium;

2, the biggest, commonly used, flow range (m3 / h);

3, work pressure (Mpa), temperature (℃), the maximum pressure (Mpa), upper and lower temperature (℃);

4, medium density, viscosity,

5, pipe material, inner diameter, outside diameter;

6, the pipe laying and local resistance.

7, you need to display instrument of the measurement and control of form a complete set, please refer to the corresponding specifications, choose the right model or the information provided by our company technical personnel according to your designs for you selection.

8, if you have special want to, please contact our sales department.

After-sales service commitment:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understａnd the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.