Far eastone type vortex flowmeter

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Far eastone type vortex flowmeter is according to the principle of Carmen (Karman vortex street meas…

Products overview:

ZW - LUGB seriesFar eastone type vortex flowmeterTo adopt advanced technology of differential, cooperate the measures such as isolation, shielding, filtering, overcome the similar products such problems as poor vibration resistance, small signal data disorders, using a unique sensor encapsulation technology and protective measures, to ensure the reliability of the product.Products are both basic and compound type, basic measuring single signal;Compound can be realized at the same time temperature, pressure, flow rate measurement.Each type has overall, fission structure, in order to adapt to different installation environment.Has no moving parts, large measurement range, wide adaptability, high measurement precision, calibration cycle is long, transmission distance, small pressure loss, simple structure, reliable operation, long service life, easy installation and maintenance and many other significant advantages.Can be widely used in petrochemical, metallurgical machinery, food, papermaking, and urban pipeline of heating, water supply, gas and other industries of various kinds of single-phase fluid such as liquid, gas, steam process measurement and energy saving management.

Second, the working principle:
ZW - LUGB seriesFar eastone type vortex flowmeter is by the design, testing probe in the flow field in the vortex body and the corresponding electronic circuit, etc.When the fluid flows through the spiral body occurs, it is formed on both sides of the two rows of vortex variations, this vortex is known as the karman vortex street.On the basis of the theory of karman vortex street and proposed the karman vortex street frequency is proportional to the velocity of the fluid, the relation between the frequency and velocity are presented:
F = St * V/d type:
F vortex frequency (Hz)
V vortex occurred body on both sides of the average flow velocity (m/s)
St, luo hall coefficient (constant)
These variations of vortex is formed a series of variations of negative pressure, the pressure on detecting probe, and produce a series of alternating electric signals, after dealing with the preamplifier conversion, plastic, amplification, the output is proportional to the vortex synchronous pulse frequency signal (or standard).
Third, selection and application of use:
1, in order to use convenient, battery type USES the micro power consumption of new and high technology, using lithium batteries don't run around more than a year, saving the purchase cost of installation, cable and display instrument to local display instantaneous flow and cumulative flow, etc.
2, temperature compensation, a body with a temperature sensor, can directly measure the temperature of saturated steam and calculate the stress, which shows that the mass flow of saturated steam.
3 size, temperature, pressure compensation with temperature and pressure sensors, used for gas flow measurement can directly measure the temperature and pressure of gas medium, showing the state of the volume of the gas flow.
4, widely used in petroleum, 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:
1, can accurately measure within wide flow range of gas, liquid and steam flow and not affected by fluid physical properties;
2, not affected by temperature, pressure, not easy to plug at the same time, not easy card, not easy to scale, high temperature resistant, high voltage;
3, safety explosion-proof, suitable for bad environment;
4, have no moving parts, no hole aperture design, product without any abrasion, corrosion resistance, dirt without mechanical maintenance, long service life;
5, using micro power consumption of new and high technology, a battery-powered scene shows type flowmeter, power is not running for more than two years;
6, temperature, pressure compensation integrated design;
7, current output are electrical isolation, good common-mode interference suppression ability;
8, also showed flow values and cumulative flow value, don't have to take turns to switch;
9, using vibration probe, the effective elimination of the influence of external vibration;
10, using split type signal converters, cable zui, 100 meters long;
11, than a wide range of those days;
12, instrument structure design is reasonable, wide dynamic range, small pressure loss;
13, table body is made of stainless steel material, can be applied to measurements of corrosive medium;
14, the liquid crystal display, pulse, 4 ~ 20 ma output 485 newsletter, or can be connected to the industrial automation system.
Five, the technical parameters:
1, the measured medium: liquid, gas, steam;
2, measuring range: (see table below);
3: (see table), nominal size of non-standard products can be customized according to user requirements special;
4, temperature range: piezoelectric - 40 ℃ ~ 350 ℃ capacitive - 60 ℃ ~ 450 ℃;
5, pressure specifications: PN1.6 Mpa;PN2.5 Mpa;Specifications can be customized special PN4.0 Mpa, higher pressure;
6, fan surrounded degree: normal range "extended range 1:15;
7, the pressure loss coefficient: Cd 2.6 or less;
8, system measuring accuracy: liquid, gas, plus or minus 1% of the value;
Steam steamed value plus or minus 1.5%;
Insert the value plus or minus 2.5%;
9, the power supply voltage: sensor + 12 VDC and + 24 VDC (optional) transmitter + 24 VDC;
Site type display instrument with 3.6 V lithium batteries;
10, output signal, sensor pulse frequency signal 0.1 ~ 3000 hz low level 1 v high level 6 v or more or less;
. Transducer two wire system 4 ~ 20 ma DC current signal;
11, allows vibration acceleration: piezoelectric capacitive acuities were 1.0 g 0.2 g or less;
: 12, the environment temperature sensors: - 30 ℃ ~ 65 ℃ transmitter, scene shows: - 10 ℃ to 50 ℃.
13, environment humidity: 5 ~ 85% relative humidity;
14 and the atmospheric pressure: 86 ~ 106 kpa;
15, signal remote transmission distance: 500 m or less.
16, signal interface: internal thread M20 x 1.5;
17, explosion-proof grade: (ia) Ⅱ CT2 - T5;
18, protection grade: regular IP65 diving IP68;
19, instrument material: instrument shell adopts aluminium alloy, the table body part adopts 304 stainless steel material, also can according to user requirements the use of special materials.

Six, appearance size:

Seven, pipe requirements:
1, the requirement for straight pipe:
In order to ensure that the instrument, accurate to run normally, sensor must have a certain straight pipe upstream and downstream of the installation points, to adjust the flow field, as shown.

Figure 1: concentric contraction tube;
Figure 2: the concentric expansion tube;
Figure 3: a 90 - degree Angle;
Figure 4: the same plane of two 90 - degree Angle;
Figure 5: different plane of two 90 - degree Angle;
Figure 6: regulating valve should be installed downstream of the sensor in 5 d to the distance, if the sensor must be installed in the upstream, the sensors should be not less than 50 d upstream, straight pipe section downstream straight pipe section should be not less than 5 d.
2, the requirement of pipe:
A, upstream and downstream piping diameter D and the same as the sensor inner diameter DN, its difference satisfy the following conditions: 0.95 DN D 1.1 or less or less DN.
B, piping shall be concentric with sensor, coaxial degree should be less than 0.05 DN.
C, gasket not protruding into the pipe, the inner diameter slightly larger than sensors.
D, if you want to stop inspection and cleaning the sensor, the by-pass pipe should be set up,As shown in the figure below.

 
3, the requirement of pipe vibration:
Sensors to avoid installed on the strong pipeline vibration, if necessary to install, shock absorption measures must be taken, respectively at the upstream and downstream of sensor 2 d piping fastening device, and vibration-proof pad.
Special note: in the air compressor exit strong vibration, cannot install the sensors, shall be installed after the gas storage.
4, demand for air condition:
A, the gas to be tested for single phase pipe flow, continuously flowing through a pipe.
Before b, the gas flows through the flowmeter, the flow rate must be parallel to the pipe axis, can not have vortex flow.
C, flow should be a subsonic, a pulse, its flow change slowly over time.
5, the flowmeter installation requirements:
Vortex street flowmeter to process the installation and use of the special requirements of environment is not too much, but any kind of flow measurement instrument has such a common, as far as possible to avoid vibration and high temperature environment as flow interference elements (such as compressor, separator, pressure regulating valve, reducer, and pipe, elbow, etc.), keep straight pipe before and after the instrument inside sleek straight, ensure to clean single-phase fluid measured medium, etc.

Eight, note:
1, special flange and straight pipe welding can't with the sensor.
2, when installation should make the flow of sensor mark the direction of flow and the pipe.
3, before the installation of sensor and the flange must be put away in sealing ring grooves.The location of the pressure and temperature measurement point, pressure downstream of the sensor in 3 ~ 5 dn, temperature measuring points in the downstream of 5 ~ 8 dn.
4, when measuring high temperature medium, do not use heat insulation material to wrap around the sensor link rod.

Five, connection of shielded cable, should as far as possible away from the interference of strong electromagnetic field.Absolutely not allowed with high voltage cable laying, shielded cable to shorten as far as possible, and shall not be volume, in order to reduce stray inductance, zui big length should be not more than 200 meters.
6, before installation of sensors, pipeline cleaning must be conducted.Flow after rinse tube impurities, avoid clogging sensor.Measuring liquid pipe must be full of measured liquid, prevent the interference of bubbles.
7, measuring gas pipelines to prevent the interference of reservoir fluid.Installation position as shown in figure 5.Replace the probe body under the high temperature and high pressure, it must be safe operation, high temperature protection.After cooling step-down replaceable probe at the bottom of the safety conditions.
Nine, installation specification management:
Flowmeter standard installation, to use the department in the subsequent management provide strong technical support, put forward the following specific requirements of the construction unit, after years of validation effect is very good.
1, with 4 ~ 20 ma output, pulse output.
2, GPRS remote transmission device with pulse input, input 4 ~ 20 ma.
3, with power supply prevents thunder and lightning protection (4 ~ 20 ma) signal.
4, instrument cabinets for: ark with UPS power supply, open and the socket, the GPRS communication devices, intelligent vortex flowmeter converter such as concentrated installation and lock.
5, smooth instrument ark need concrete pier base, instrument protection grade for outdoor cabinet, the ark with insulating layer to prevent sun point-blank, ark with water proof function.
6, domestic demand has left side table well enough straight pipe, facilitate intelligent vortex flowmeter test, compare and follow-up management.
7, the design of intelligent vortex flow timing front must have at least 10 times of nominal menstruation (dn) 10 straight pipe, the back-end must leave more than 5 dn straight pipe, to ensure accurate measurement.
8, shall be installed in accordance with the specifications and after the installation need measuring grounding, grounding resistance should be under 10 Ω.Equipotential connections using multiple strands of copper wires, cables should be greater than or equal to 16 was;Instrument grounding line using multiple strands of copper conductor, cable requirement was greater than or equal to 6.Grounding standard see GB50343-2009 "technical specification for building electronic information system lightning protection.

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.