Clamp vortex flowmeter

Products overview:
ZW - LUGB seriesOvercome the connection plate is needed in the general flow meter connector uniform bolt holes, using bolts, nut connecting plate fixed on the pipeline, the cost is high, the operation of trouble, the disadvantages of low efficiency, which adopts a transverse connection plate for right-angled trapezoid, inside right-angle trapezoidal bevel edge, use when using clamp plate fastening will be connected on the pipeline, use cost low, save time and effort.Measure the liquid in the pipe, automated testing instrument, is the ideal type, explosion-proof type and local display type, the clamp vortex street is applicable to many of the health industry.

Second, the working principle:
ZW - LUGB seriesClamp vortex flowmeterVertical in the measurement of tube inserted a pillars, the fluid through the pillars on both sides of the rules of the vortex is alternately, the spiral column is called the karman vortex street.The release of the karman vortex street frequency is related to the width of the fluid velocity and pillars, expressed by the type:
F = St · v/d type: - the release of the karman vortex street frequency f
St - coefficient (called, ha)
V - velocity
D - the width of the pillars
Karman vortex street release frequency f and is directly proportional to the velocity v, so by measuring the karman vortex street release frequency to calculate the instantaneous flow rate.
Stern lo ha is one of the important coefficient of vortex flowmeter.In its number of St 0.17 straight part of the material, the release of the vortex frequency is proportional to the velocity of flow, so check out the velocity v, frequency f can be obtained to calculate volume flow by v.
Vortex flow sensor be vortex frequency is applied to detect sensor by vortex alternately (probe) on in-situ stress in its internal piezoelectric element to check out.
Applications:
ZW - LUGB seriesClamp vortex flowmeterWidely used in food, chemical industry, metallurgy, machinery, paper, and the city pipe heating, water supply, gas and other industries of all kinds of low viscosity liquid, gas, steam, etc of single-phase fluid process measurement and energy saving management.
Four, the main features:
Simple 1, health industry, internals, clamp connection;
2, software configuration can be implemented all the requirements of different medium of different measurement configuration;
3, parameter setting can be set for measuring parameters of different fluid.Example: the gas deviation factor, instrument coefficient, rating, etc.;
4, since the diagnosis to set parameters, output signal, the signal sending and receiving, CPU fault diagnose, etc;
5, display a variety of diagnostic code, parameters such as flow, volume, flow percentage;
6, the output pulse, 4 ~ 20 ma.
Five, the technical parameters:
1, the accuracy of liquid: + / - 1.0%;
Gas, steam, plus or minus 1.0% FS (velocity < 35 m/s);
Plus or minus 1.5% FS (velocity of 35 m/s ~ 80 m/s);
2, 25,40,50,80,100,150,200,250,300 specifications;
3, medium temperature range: 25 ℃ ~ + 300 ℃;
4, the environment temperature range: 25 ℃ ~ 70 ℃;
5, 18 ~ 45 v DC power supply analog output;14 ~ 30 v DC pulse output;
6, work pressure 2.5 Mpa or less;
7, explosion-proof grade Exd Ⅱ CT1 ~ T6.
8, the degree of protection IP65.

Six, installation requirements:

1, the sensor should be installed in a horizontal, vertical, inclined (liquid flow from bottom to top) and its size in the same line.Sensors upstream and down 2, should be configured with a certain length of straight pipe, the straight pipe length should comply with the former 15 ~ 20 d, straight pipe after 5 ~ 1 od demands.

3, installation of liquid sensor near the pipe should be filled with liquid to be tested.

4, sensor installation should be avoided on the strong mechanical vibration of pipeline.

5, the inside diameter of straight pipe, as far as possible consistent with the sensor size, if not consistent, slightly larger than the sensor size should be adopted for the pipeline, the error to 3% or less, not more than 5 mm.

6, sensor installation should be avoided in the strong electromagnetic interference, the space is little, and maintenance is not convenient.

Seven, field requirements:
1, low maintenance - most of the vortex flowmeter are on the market with induction swirl hole or plug-in measurement, once the impurities embedded in the medium pressure hole or sensing element and the table body, the gap between the signal is weak or unstable.A good design should be not easy to plug part, thereby reducing amount of maintenance.
2, inductive components online replacement - some manufacturer of inductive components and vortex street close 2 for one, seemingly simple design to the actual use of inconvenience.Because once induction part failure, you need to medium to the pipe emptying replacement parts, after pressure relief effect production.Perfect design should be separated the two, so can replace the induction part alone, without emptying the media.
3, vortex flowmeter is vulnerable to vibration interference, well-designed vortex flowmeter can through hardware and digital signal processing to exclude interference, and the stability of the signal is obtained.
4, vortex flow meter before and after the installation of a hassle to very long straight section, some manufacturers can offer within the flowmeter reducing design, greatly reduces the user specifically MenWei vortex flowmeter with the demａnd of the straight pipe.
Need to pay attention to during the period of eight, debugging, using question:
1, flowmeter, on-site installation, maintenance, must abide by the "explosion-proof gas do not open" warnings, and in the open before turn off the power supply.
2, vortex flow meter used in outdoor, suggestion and side shields.
3, shall not be arbitrarily fixed part loosen the flowmeter.The protection of the pressure sensor.Users in the use of traffic time, should pay attention to the flow pressure overload value of pressure sensor is rated working pressure of 1.5 times (that is, the media zui high pressure of 1.5 times).Selection should be within the prescribed flow range, prevent overspeed operation, in order to obtain the ideal accuracy and ensure the normal service life.(due to pressure test, purging pipes or exhaust overdrive, and turbine operation in the reverse flow meter can cause damage)
4 when put into operation, the vortex street flowmeter, should slowly open valve, prevent damage of instantaneous flow and the turbine.Add lubricant should be according to the sign, the number of refueling depends on temperament clean degree, usually 2 ~ 3 times a year.
5, vortex street flowmeter runtime or alternate internal related parameters are not allowed to open the rear cover, otherwise will affect the normal operation of the meter.
Nine, install and use the items that should be paid attention to:
Vortex street no mechanical moving parts, small size, corrosion resistance, stable performance, can be directly display medium work pressure, temperature, flow rate and volume under standard state, wide range, the advantages of small measurement error, has been widely used in oil and gas well production measurement and gas sales.In field application over the years, we believe that the meter is suitable for relatively clean dry gas metering, gradually become small and medium-sized gas metering.To guarantee the accuracy of the flowmeter measurement, reduce the measuring error, please note:
1, the selection of reasonable
Don't make the actual z small flow meter QVmin below the selected through runoff flow range limit.
2, installation is correct
Upstream of the vortex flowmeter should have at least 10 d measuring straight pipe length.Straight pipe inner surface should be smooth, cannot have the steps, more smooth connecting flange weld, flange gasket can't into the pipe.Don't put the wrong installation direction of the flow meter.Tests showed that: all the unreasonable installation, will lead to the flowmeter measurement value is low.
3, away from the source of shocks, or install piers in upstream or downstream flow meter, in order to avoid the influence of the pipeline vibration.Avoid strong magnetic field disturbance to the flow meter chip.
4, temperament is relatively clean
Especially not a gas liquid two phase flow;Temperament is dirty, should clean instant flow meter.
5, and reduce the influence of flow pulsation
It can be installed in front of the flow meter buffer tank, or extended length of straight pipe upstream of the flow meter, computation.
6, timely flowmeter for metrological verification, to ensure accurate and reliable value.

Ten, standard of flow range profile: unit (m3/h）

Eleven, selection of coding:

Twelve,Order to choose selection guidelines:

Name and model number of 1, 1), (2) the diameter, flow range, (3) whether or not to bring the attached so that we can correct selection for you, (4) using pressure, (5) the use of medium temperature.

2, if has been selected by design units in the way of vortex street flowmeter types, please press type vortex flowmeter directly order from our sales department.

3, when using occasions is very important, or the environment is complex, please try to provide the design drawings and detailed parameters, by wei experts in our audit checks for you.

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.