Toba flowmeter

Products overview:

ZW - WTB series allowsToba flowmeterInsert the sensor pipe center, total pressure hole for fluid to flow direction, the static pressure hole for fluid to flow direction, the difference between the total pressure and static pressure is the center of the pipe the measured differential pressure, again by wind tunnel of the probe calibration curve fitting out of the standard deviation of pressure point, according to the standard deviation to calculate fluid pressure flow.Also need a pressure transmitter to measure fluid pressure, heat resistance thermometer to measure fluid temperature, the standard deviation of the pressure signal, pressure signal, temperature signal at the same time introducing or direct access to the single chip flow totalizer.especially DCS system, on the one hand, to probe the flow equation, and then on the one hand, the steam pressure, temperature compensation, to ensure the accuracy of measurement, and digital display pressure, pressure, temperature, instantaneous flow and cumulative flow, heat, speed and other parameters.

Second, the working principle:

ZW - WTB series allows wei toba flowmeter sensor composed of a set of selecting pressure hole, on the principle of pitot tube to extract fluid flow velocity (total pressure, static pressure = dynamic pressure) and then converted to fluid volume flow to mass flow of differential pressure type flowmeter.

When the fluid flows through the sensor, a high pressure generated in the front of its distribution area, hydrostatic pressure slightly higher than the area of high pressure pipe.According to the principle of Bernoulli equation, to speed up the speed when the fluid flows through the probe, the probe at the back of the produce a low pressure area, the pressure is slightly lower than area of low pressure pipe of the static pressure.Fluid from the probe through the vacuum on the probe at the back of the part, and appear on both sides of the probe vortex.Average flow cross section shape of probe, the condition of surface roughness and low pressure hole location is the key to probe performance factors.Low voltage signal is stable and accurate, is crucial to average probe of precision and performance.Pig, average flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure.Wei toba average flow probe in high and low pressure area according to certain criteria to take more pressure hole configuration, make it possible to accurately measure the average velocity.

Applications:

ZW - WTB series toba flowmeter is a kind of sensor allows for a variety of medium flow meter, it can be widely applied to gas, steam and liquid flow measurement.Of gas: a wind speed, the secondary wind speed (quantity), the (negative pressure) air, oxygen, hydrogen and dry gas, converter gas, blast furnace gas and producer gas, coke oven gas, natural gas, liquefied gas, gas, chemical material, etc.;Gas: the superheated steam and saturated steam, wet steam, dry steam, two-way, etc.Liquid: water, dissatisfaction with pipe water, wash oil, sponge oil, light oil, tar, heavy oil, crude oil, corrosive liquid, chemical liquid material, paraffin, etc, all kinds of solution.

Four, classification, application recommended products:

1, toba type flowmeter:

Wei toba flow sensor is widely used in industrial led, such as metallurgy, electric power, petroleum, chemical industry, etc.Sort is various, it applies fluid contains almost all relatively clean liquid medium.Such as the common steam, general gas and water fluid viscosity measurement can choose WTB -s allows type flowmeter.WTB - S scale allows simple, easy installation, just a Φ 25 mm hole in the pipe, the toba insert to the pipe center, by welding or flange and pipe connection.General working condition of gas/liquid, promote choose ordinary steam conditions, promote choose radiator pipe type medium in the pipe flow to the change of working conditions, promote use double flow wei toba sensor when the nominal pipe diameter 5 mm or less Φ 25 mm or less, to promote use of pocket.

2, toba high temperature and high pressure meter:

Wei toba flow sensor is mainly used in high temperature and high pressure high velocity or ultra high temperature super high pressure steam flowmeter.It adopts high temperature resistant, resistant to rotting 1 cr18ni9ti materials, a complete metal cavity structure, ensure the strength and rigidity, that under the high speed air flow scouring mechanism damage will not occur.The sensor in the process of measuring pressure is more stable and accurate.Used the medium to be measured temperature, the pressure sensor to temperature and pressure compensation, to ensure the accuracy of measurement.WTB - allows M type flowmeter in front of the product are made in excess of 150% of the working pressure stress test, to ensure safe and reliable.

3, toba prevent abrasion resistance meter:

Wei toba flow sensor in metallurgy, electric power, petroleum, chemical and other industries widely used.Measure flow medium containing impurities are optional, such as a volume of electric power industry, the secondary gas of various materials in the air, chemical industry, metallurgical industry in various gas, etc.WTB - allows type B's main function is to solve the problem of the congestion and wear the sensor.Introduction of form a complete set of ball valve device and safety protection device can give online sensor installation, remove the function.

Five, the main features:

By calibration, is critical to the success of the segmented correction.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: toba sensor intercepting area is 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.Fluid conditions

Six, 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);

In the long run, the practice to solve the problem in the process of:

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 check pitot flowmeter.

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

The measurement of insufficient 10, implements the straight pipe.

Eight, supporting the blockage of flow sensor design.

Wei in the probe's unique design thoroughly get rid of the 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.

Wei toba 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.Held in the probe's unique design, coupled with the nature of gravity whereabouts, prevents the particles into, this design essentially prevents the gateway at congestion and can create a very stable low voltage signal.

Continuous work of fundamentally put an end to 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.

Nine, 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.

6, of this intelligent velocity-equalizing tube flowmeter, pressure compensation can take temperature, 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.

Ten, 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).

Eleven, product maintenance instructions:

Wei toba flow 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, use notice:

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

2, the fluid being measured should be single phase, the phase constant, the composition 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.

13, selection of coding:

14, 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.