Power of the flowmeter

Products overview:

ZW - WLB seriesPower of the flowmeterAdopted completely aerodynamic engineering structure design, is a precision, reliable efficacy and has reached a remarkable degree of the sensing element.By the integration of power and sensor, differential pressure transmitter and integrating instrument of the flow measurement system, can also be used to control a system or computer networking, fluid flow measurement and control.The centrally reflect velocity-equalizing tube flow sensor and sensor powerful z new research results.

Power flow sensor were advanced differential pressure type flow measurement technology, the complete aerodynamic engineering structure design, is a precision, reliable efficacy and has reached a remarkable degree of the sensing element.

Power high precision and is suitable for gas, liquid and steam flow measurement.Was a powerful differentiae pressure, rate of average flow sensor, through the sensor in the fluid produced by the differential pressure flow rate measurement.Power and reflect the actual velocity of the fluid, and its accuracy is + / - 1.0%, repeatability of plus or minus 0.1%.Output power of the outstanding advantages are: a very stable, no differential pressure signal of pulse.

Second, the working principle:

ZW - WLB series power meter were a differentia pressure, rate of average flow sensor, through the sensor in the fluid produced by the differential pressure measurement.In pipeline to insert a force sensor, when the fluid flows through the sensor, a high pressure generated in the front of the incident flow direction distribution area, a low pressure area in the back.Sensors in high and low pressure area is arranged according to certain rules for the average for the three more to take pressure hole, the full pressure measured fluid including static pressure and average velocity pressure Pl and static pressure P2.Differential pressure transmitter, introduced the P1 and P2 respectively, measuring the pressure delta P = (P1, P2, delta P reflects the size of the average speed of fluid, fluid flow can be calculated.

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.The average power flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure.The average power flow probe in the rule of high and low pressure area is in a certain arrangement to take more pressure hole, made it possible to accurately measure the average velocity.

Applications:

ZW series - WLB power, scope and its widely used flowmeter, it is used for various kinds of gas, liquid and steam measurement, the following is a typical application of medium:

1, gas/liquid/vapor;

2, gas/water/saturated steam;

3, compressed air/water/boiler superheated steam;

4, gas/in addition to the brine;

5, hydrocarbon gas/liquid hydrocarbons;

6, hot air/liquid at low temperature;

7, producer gas/liquid heat.

Four, the characteristics of the power of the sensor:

1, stable signal;

Power and low voltage take pressure on both sides of the hole is located in the probe lientang, between the fluid and probe separation point, away from the eddy current range.

2, excellent long-term high accuracy;

Can ensure the long-term stability of the accuracy of power, this is because:

A, it is not affected by wear, dirt and oil.

B, the structure with no moving parts.

C, on the design in addition to jam.In the front of the probe, high static pressure area around the probe, make the high pressure hole will not be blocked.Zui important, low pressure hole on either side of the probe lientang, fluid from the surface of inclined swept through, the protection of the low pressure hole will not be swept, and the other probe to congestion, because of their low pressure take pressure hole in impurities gathered in the low pressure range.

3, installation cost is low;

A, only need a few inches of welding line, complete the installation is very simple and fast.

B, application, special tools, can be achieved with a line installation.

C, all the valve and all kinds of instrument interface for simple assembly, need very low assembly cost.

4, very low operation cost;

A, it is a kind of contracted design of throttle, as a kind of plug flow sensor, power and operation cost is low zui.

B, and the power meter only * of very low pressure loss, typically less than 0.7 KPa

C, an orifice plate components produced by the * sex more than 14 kpa pressure loss

D, compared with the orifice plate, and the power of energy loss was reduced by 95.

5, the power of continuous work, fundamentally eliminate the possibility of the wall, but in the following cases, the power, still should pay attention to prevent:

A, when the pressure pipe leaking, probe and pressure equilibrium is destroyed, impurities in the smaller diameter particles could enter

Hole.

B, when the pipeline was shut down, because of the molecule Brownian motion, small particles of impurities may enter the hole.

C, 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.

D, medium contains a large amount of tar, biological species, or containing fibrous material, may also cause the probe of the jam.

Five, the application of new technology:

Power and adopted completely aerodynamic engineering structure design, is a precision, reliable efficacy and has reached a remarkable degree of the sensing element.The joint power of original design with the valve brａnd new design concept provides a new concept, built-in instrument in instrument tapping cut-off valve.

1, make installation and maintenance more simple;

2, a reduction in the number of assembly parts, hardware connection;

3, cost reduction;

4, fast installation system;

5, quick insert and pull out;

6, seal drive system to avoid damaging components;

7, can be respectively applied to multiple probe installation;

8 and all the installation does not exceed 1 hour.

Six, the main features:

1, can measure a variety of media, wide range of applications;

2, high precision, large range than;

3, probe with hole held in nature;

4, measuring signal stability, small fluctuation;

5, low pressure loss of the pipeline;

6 the monolithic double cavity structure, unique high strength;

7, low cost of installation, basic free maintenance;

8, can online installation and maintenance.

Seven, the technical parameters:

1, the suitable diameter: 8 mm to 30000 mm;

2, the accuracy of measurement: + 0.5% to + 1.0%;

3, the repeat precision: + / - 0.1%;

4, apply pressure: 0 ~ 25 mpa, special applications can reach 40 mpa;

5, suitable temperature to 100 ℃ ~ 500 ℃, the special application of up to 800 ℃;

6, measurement limit: according to the technological requirements and probe strength;

7, measuring floor: depends on measuring z uninteresting facts pressure requirements, lower than z uninteresting facts, the pressure to the use of special design to meet the requirements;

Gas, z uninteresting facts 0.026 KPa pressure, velocity of 4.5 m/s;

Liquid, z uninteresting facts 0.260 KPa pressure, velocity of 0.6 m/s;

Steam, z uninteresting facts 0.400 KPa pressure, velocity of 9.7 m/s;

8, range than: in guarantee accuracy of plus or minus 0.5% ~ + 1.0%, the range than 10:1, special occasions can reach 60:1;

9, suitable medium: full package, one-way gas, steam and liquid viscosity is not more than 10 centipoise;

10, straight pipe requirements: normally before the 7 d, 3 d after to ensure measurement accuracy + 0.5% to + 1.0%.

Eight, the probe design features:

Power of the flowmeter cross section shape of probe can produce accurate pressure distribution, fixed flow separation point;Located in the probe lientang, fluid separation point on either side of low pressure before selecting pressure hole, can generate stable differential pressure signal, and effectively prevent.Internal integration structure can avoid leakage of signals, improve probe structural strength, maintain a long-term and high precision.

Power of the probe blockage prevention design.

Probe with its remarkable trap design, thoroughly get rid of the pig and plug flow probe the disadvantages of easy jam, such as make velocity-equalizing tube flow sensor to collect level has reached an unprecedented height.

Probe high pressure in the front of the hole will not be plugged probe form high, pressure slightly higher than the duct static pressure, prevents the particles to enter.Please note: the probe on the high pressure from pressure hole fluid velocity is zero, no object into the hole.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.

Unique design, make the low pressure on both sides of the hole is located in the probe lientang, fluid separation point, and the front of wake region.This design essentially prevent the congestion and can create a very stable low voltage signal.

Nine, operation and maintenance:

The preparing work before put into operation:

1, sensors installed correctly:

Complete sensors installed in the line, must carefully check before put into operation, require welding is firm, in the right direction, not leak, strictly proper insertion depth, etc.

2, instrument calibration:

Sensor matching instrument differential pressure transmitter and intelligent flow integrating instrument (there could be pressure transmitter and temperature transmitter), etc.Must be after inspection and calibration, can be put into use.The instrument measuring range to conform to the requirements of the sensors and the measured medium.Such as air mass flow to be tested Qmax = 5000 m3 / h, the calculation to calculate differential zui big value of sensor

Delta Pmax = 0.6 Kpa, the measuring range of differential pressure transmitter should be set-up of 0 ~ 0.6 Kpa, the corresponding output 4 ~ 20 madc current signal.For universal, flow totalizer.especially should according to the real-time flow range, differential pressure range, medium density, temperature, pressure, flow operation requirements, etc., prior programming configuration, input totalizer.especially can correct operation and make sure totalizer.especially display traffic.

3, instrument wiring correct:

Sensor and differential pressure transmitter, flow integrating instrument of measuring system, such as supporting the power cord, signal output to the input line between instrument, control and alarm, etc., in various instrument wiring board (also known as terminal board) are clearly marked, is must confirm and don't choose to use, before the operation of the instrument connection to check again and again.In order to do the preparing work before put into operation, in addition to read the instruction for use, you should also read the differential pressure transmitter operation instruction handbook ", "operation instruction handbook" intelligent flow totalizer.especially etc, comply with the instruction manual for the guidance of work.

The flow operation of work:

1, the measurement system is closed:

Operation of preparatory work has been completed, the medium to be measured with flow process piping, sensor measuring system is temporarily closed, then should make three balancing valve is fully open valve group, high pressure valve P l P2 and low pressure valve closed.Meter is in a state of power supply, preheating about 15 minutes.

2, open measurement systems:

Instrument after preheating, open measurement system.Open the Pl on three valve group and P2 valves, balance valve is still in the open.At this time, the differential pressure transmitter has filling the measured medium (gas or liquid), open the drain valve on the transmitter, quickly closed after discharge dirty liquid or gas.Then close three the balance valve on the valve group, transmitter that is entered into a state of differential pressure measurement.Output and the corresponding signal current differential delta P I delta P from the signal current value (m A) to calculate the pressure delta P values (KP) A.Also flow totalizer.especially into work state, show the measured medium flow.

If the above work all goes well, the flow meter works well, commissioning work is complete, delivery production use.

Maintenance:

Power integrated sensor free maintenance.Form a complete set of secondary instrument maintenance quantity is small, only need to make some zero check, such as range test of routine maintenance.But, on some occasions, the use of the measured medium condition and design deviation is large, we have to make some field parameter correction etc.Name several ways as follows:

1, the production process of discontinuity, the continual occasions.Flowmeter maintenance should be paid attention to.When shut down when the production process, should open the three valve group of balance valve, high pressure valve P l P2 and low pressure valve closed, differential pressure transmitter in the differential input state.When resume production process, should refocus on the P 1 and P2.Close the balance valve and differential pressure transmitter input differential pressure measurement is resumed.

More than 2, for some dust content of measured medium, such as gas (not clean), industrial water (sand), wet gas (dust), etc., can block the probe is expected to take pressure hole, should be regularly to purge.Introduction of the compressed air purge method sensor counter blowing, stick bore high pressure and low pressure off the dust of the prevent the blocking phenomenon.Purge time less than 30 seconds at a time, in this period of time should be guided to the differential pressure transmitter pressure pipeline is shut, purge open again.On the occasion of individual is not allowed to blow into the compressed air, such as high temperature gas, usable to blow off steam.

Ten, and online installation disassembly type power:

For some can't production installation of measuring point and medium containing impurities can choose online installation disassembly type Deere.Online installation disassembly type Deere barco without production of the installation or maintenance probes, especially suitable for not installed production point or medium are dirty need the measuring point of preventive maintenance.It equipped with single screw driven and used in high pressure double pole drive type.

Features: can be without shutdown for installation, disassembly, maintenance, cleaning.

Suitable conditions: normally used in low pressure air, water, gas, steam and other media.

Note: online should satisfy when install or remove t 120 ℃ or less P acuities were 2.5 MPa

11, the main parts:

1, and power according to pipe diameter custom, with flange is installed on the pipeline, made of stainless steel refined but become, according to the various parameters of the users in high precision wind tunnel laboratory simulation, the characteristic curve and the database, used for calculation.

2 is to display the measured results, flow totalizer.especially secondary instrument.Through wires connected to each transmitter and thermometer, the motherboard is equipped with advanced CPU and the application software, can use the display window and switch button to setup, calibration and the parameters display.

3, differential pressure transmitter will Deere and convert the differential pressure signal of 4-20 madc analog current signal.

4, pressure transmitter in the gas flow measurement with pressure compensation.

5 in gas flow measurement, temperature transmitter temperature compensation.

6, dc power supply for pressure transmitter, differential pressure transmitter power and thermal resistance thermometer.

12, supporting 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.

13, device complete sex:

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).

14, and the power flow sensor plug design:

The unique design of probe power 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.

Low power, high flow sensor, take 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 flowmeter 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 pipeline in production, due to the brown movement of molecules, small particles of impurities may enter the hole.

3. The system is often a 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 blockage.

15 and 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, 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.

16, installation requirements:

Installed correctly is to ensure that the basis of power and meet the design accuracy, so take special installation requirements:

1 straight pipe length requirements.

2 check pipeline direction.Power components are inserted into the pipe after, adjust INSTRUMENTHEAD direction, the direction of arrow and the pipe fluid in the same direction, and the direction of the pipeline in plus or minus 30 Angle.

Three horizontal pipe installation, measure the gas medium, the power of the above should be installed in the pipeline, which can make the pressure tube condensate back into the pipeline.Measuring liquid and steam, should be installed at the bottom of the pipe, it can make the bubble back into the pipeline;Vertical pipe installation, can be installed in vertical pipe 3600 anywhere.

4 transmitter installation location.Measure the gas medium, the location of the transmitter should be installed in a higher power and;Measuring liquid and steam medium, the location of the transmitter should be installed in the lower than the power.

5 power and unique design prevent the jam from the essence, but this is based on process and component based on normal operation of power.Once the blockage of power, clean up will be very difficult, so the installation power must pay special attention to prevent.

A. pressure pipe leaking, probe high pressure equilibrium zone damage, less impurity particles can enter pressure hole, so always check the pressure tube.

B. technology park, due to the brown movement of molecules, small particles of impurities may into the hole.If stopped for a long time, should be kept open back.

C. process system frequently open parking, formed in the high moment, small particles of impurities may be entering hole, accumulate over a long period can cause probe blockage, this kind of circumstance to choose carefully, powerful or establishing purging device, when parking for purging of the system response.

17, notable matters of installation:

The flowmeter is a powerful differentiae pressure, rate of average flow sensor, through the sensor in the fluid produced by the differential pressure flow rate measurement.Suitable for gas, liquid and steam flow of high precision measurement.Can be installed on any platform (horizontal, vertical, inclined) during the installation process should consider the effect of the measured medium to the pressure pipeline.Power the meter during the installation process should pay attention to the following:

1, the measurement of gas flow in vertical pipe, flow meter can be installed in horizontal pipe, the pipe of 360 degrees to any position.For the horizontal line, flow meter of pressure under the joint must be located on the center line of the pipeline.

2, the liquid flow in vertical pipe, flow meter can be installed in horizontal pipe, 360 degrees along the pipeline.For the horizontal line, flow meter of pressure joint must be below the centerline of the pipeline.

Around 3, measurement of steam flow in vertical pipe in the horizontal plane, should pay attention to the two pressure pressure joints should be in the same horizontal plane.At the request of the power differential pressure type flowmeter in the straight pipe length is relatively short, this is one advantage of this kind of flow meter.

Eighteen, selection of coding:

Example: ZW - WLB - M1 - S1-4 - SL - Y133 / CS - H - A

Description: 1, threaded connection type;10 # sensor;Circular tube (diameter 133 mm, wall thickness 4 mm);The probe material of 316 l stainless steel;Horizontal piping installation;Pipe material is carbon steel;Meter connector for threaded joints, side.

Choose and order notes on the 19th, design:

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.