The flow meter of John Deere

Products overview:

ZW - DRB seriesThe flow meter of John DeereSimple structure, convenient installation, small pressure loss, use and maintenance cost is low, the global growing energy shortage as a result of economic rapid development today, is a worth promoting and using energy-saving economic flow meter, especially under the condition of the pipeline is greater than 200 mm, the advantages of the flowmeter are more obvious.Is internationally recognized as a source in traffic detection in high precision, good repeatability and reliable operation of a new type of plug flow meter.Therefore, in the electric power, metallurgy, petrochemical and other industries.

Second, the working principle:

ZW series - DRB Deere when fluid flows through the probe, the flowmeter in the front of its producing a high pressure 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.Flow cross section shape of probe, the location of the rough surface condition and low pressure hole is the key to probe performance factors.Low voltage signal is stable and accurate, is crucial to probe the precision and performance.

Applications:

ZW series - DRB Deere the flowmeter measurement is suitable for a variety of media: full tube, a one-way flow, single-phase gas, steam and liquid viscosity is not more than 10 centipoise, such as:

1, the power plant of the primary and secondary wind measurement;

2, blast furnace gas measurement;

3, ethane, ethylene, natural gas and other measurement;

4, gas, nitrogen, oxygen, such as measurement;

5, compressed air measurement;

6, saturated steam, high and low voltage measurement;

7, tap water, circulating water etc, to defend the blocking design Deere and flow measuring 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.

Four, the main features:

1, stable signal:

Deere of low-pressure 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:

Deere can ensure the long-term stability of precision, 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, low cost of installation:

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 operating cost:

A, it is a kind of contracted design of throttle, as a kind of plug flow probe, Deere and operation cost is low zui;

B, Deere flow sensor only * of very low pressure loss, typically less than 0.7 KPa;

C, an orifice plate element of * more than 14 kpa pressure loss;

D, compared with orifice, energy loss was reduced by 95%.

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

A, when the pressure pipe leaking, probe and pressure equilibrium is destroyed, impurities in the diameter of the smaller particles are likely to enter the 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 technical parameters:

1, apply pressure: 0 ~ 40 mpa;

2, suitable temperature: 180 ~ + 550 ℃.

3, the measuring accuracy: + / - 1%;

4, repeat accuracy: + / - 0.1%;

5, pipe size: DN38 ~ DN10000 round or square tube;

6, quantity than: more than 10:1;

7, flow range: measure the upper and lower limits in the probe strength and allow zui uninteresting facts pressure within the selection.

Six, probe the advantages:

Cross section of the probe can produce accurate pressure distribution and 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.

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 pipe *;

6, low cost of installation, basic free maintenance;

7, can online installation and maintenance.

Seven, application of new technology:

Original design joint with the valve the flow meter of John Deere brａnd new design concept provides a new concept, built-in instrument in instrument tapping globe 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.

Eight, USES and advantages:

1, John Deere high precision and is suitable for gas, liquid and steam flow measurement.Deere a differentia pressure, rate of average flow sensor, through the sensor in the fluid produced by the differential pressure flow rate measurement.Deere and reflect the actual velocity of the fluid, and its accuracy is + / - 1.0%, repeatability of plus or minus 0.1%.

Advantage is: 2, Deere output a very stable, no pulsation differential pressure signal of the probe and high pressure in the front of the hole will not be plugged probe form high, pressure is slightly higher than the duct static pressure, prevents the particles into.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.

3, Deere and 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 focused on the leeward reasons behind the house.Other probe due to the low pressure take pressure hole take empty space at the end of the probe, under the action of the vortex street force, probe the low pressure from impurities removing hole by eddy current quickly.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, probes the application of choice:

1, M1 threaded economic practical probe:

Scope of application: applicable interesting pressure of air, liquid and other non dangerous gas and liquid flow measurement;

Suitable diameter: 38-1000 - mm;

2, the M2 threaded opposite support probe:

Scope of application: when the flow or larger diameter selection, enhanced for M1, especially suitable for large diameter gas flow measurement, such as air volume;

Suitable diameter: 38-1600 - mm;

3, M3 flange connection probe:

Application scope: especially suitable for high temperature and high pressure steam, such as oxygen flow measurement of flammable and explosive medium, satisfy the premise of process control in order to save cost of optional part insertion;

Suitable diameter: 38-10000 - mm;

4, the M4 flange opposite support probe:

Application scope: especially suitable for high temperature and high pressure steam, such as oxygen flow measurement of flammable and explosive medium, when meet under the premise of process control medium flow measurement, when meet under the premise of process control in order to save cost optional part insertion;

Suitable diameter: 38-10000 - mm;

5, safe M5 threaded probe:

Application: apply to the M5 probe in many times after remove still can guarantee good sealing performance, applied to the temperature of 300 ℃ or less and pressure 3.0 Mpa or less air such as non flammable and explosive gas or liquid flow measurement.Especially suitable for low pressure steam flow measurement.

Suitable diameter: 38-1600 - mm.

6, M6 thread connection online installation probe:

Application: apply to M6 threaded connections online installation type probe can install or remove without shutdown case, especially suitable for application in not installed production point or medium are dirty points need preventive maintenance, such as blast furnace gas, etc.In straight pipe section long enough measurement occasions, from saving equipment investment, can use M61 probe the whole tube insertion type online installation.

Suitable diameter: 38-10000 - mm;

M61 all plug-in installed probe online;

M62 full plug-in installed probe online;

Optional item Ⅰ (elected for the M3 / M4 need this option).

Ten, flange rating:

Optional item (optional) according to the requirement of the user

Eleven, ball valve or gate valve:

1, BC with carbon steel ball valve;

2, BS with stainless steel ball valve;

3, the GC with carbon steel gate valve;

4, GS with stainless steel gate valves.

12, main parts:

Per pipe diameter of 1, dill, installed on the pipe with flange, 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.

13, matching 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.

Fourteen, equipment complete set:

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).

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, Deere online installation disassembly type:

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

The 17th and put into 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 measured zui large air flow 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 "low er baba flowmeter operation instruction handbook", you should also read the differential pressure transmitter operation instruction handbook ", "intelligent flow integrating instrument operation instruction handbook" etc, comply with the instruction for the guidance of the work.

Maintenance:

Deere 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.

Eighteen, prevent blocking design:

1, the unique design of flow probe dill 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.

2, just boot, 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.

3, the flow sensor of high, low pressure hole held in nature.

4, 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.

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

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

B. when pipe production at, because of the brown movement of molecules, small particles of impurities may enter the hole.

C. system key, frequently at the instant of the high formation, 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 number of biological species, or containing fibrous material, may also cause the probe blockage.

In the 19th, selection of coding:

Example: ZW - DRB - 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.

Twenty, 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.