Will the flowmeter

Products overview:

ZW - WRB series will flowmeter were using the principle of differential pressure type design and production of a new type of flow meters, consists of sensor, differential pressure transmitter or flow integrating instrument, etc.Sensor shape such as head, can quickly and accurately detected by the average flow velocity of fluid produced by the differential pressure signal.Due to the low voltage side of drawing hole of special design effectively reduced the clogging situation of low pressure hole, so as to improve the accuracy of the flowmeter measurement.Measured gas, liquid, steam and corrosive medium, etc., to adapt to all kinds of size of pipe and rectangular pipe installation.For the measured pipe straight pipe before and after the request is not high, can online for installation and maintenance, has been widely used in metallurgy, chemical industry.

Second, the working principle:

ZW - TRB series will flowmeter were when 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.Average flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure.Average flow probe in high and low pressure area according to certain criteria to take more pressure hole configuration, making it possible to accurately measure the average velocity.

Applications:

ZW - TRB series will the using range of flow meter and its wide, 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 main features:

1, stable signal

Low 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 precision, this is because:

(1), it is not affected by wear, dirt and oil.

2] structure, no moving parts.

(3) doubts, design in addition to blocking phenomenon occurred.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

(1), requires only a few inches of welding line, complete the installation is very simple and fast.

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

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

4, very low operating cost

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

2, and will produce only * of very low pressure loss, typically less than 0.7 KPa.

(3), an orifice plate components produced by the * sex more than 14 kpa pressure loss.

(4), compared with the orifice plate, and the power of energy loss was reduced by 95%.

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

(1), 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.

2, when the pipeline production at due to molecular Brownian motion, 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 amount of tar, biological species, or containing fibrous material, may also cause the probe of the jam.

Five, the technical parameters:

1, the accuracy of measurement: plus or minus 1% repeat accuracy: + / - 0.1%;

2, apply pressure: 0 ~ 40 mpa applicable temperature: 180 ℃ ~ + 550 ℃;

3, measurement limit: depends on the strength measurement probe floor: depends on measuring zui uninteresting facts pressure requirements;

4, range than: more than 10, 1;

5, suitable diameter: 38 mm to 9000 mm round tubes, square tubes;

6, suitable medium: tube, one-way flow, one-way gas, steam and not greater than 1 0 centipoise liquid viscosity range and its widely used, it is used for various kinds of gas, liquid and steam measurement, the following is a typical application of medium.

Six, 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 zui measured flow Qmax = 5000 m3 / h, the calculation to calculate the differential value of the produce.

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 Pl 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.

Seven, and blockage of the sensor design.

Flow sensor'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.

Probe type of flow sensor is high, low 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.Held in the probe's 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.

Work continuously probe 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.

Main components:

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

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:

Will the flow sensor should be performed in the process piping overhaul regular cleaning, 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, selection of coding:

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.