Split type vortex flowmeter

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Split type vortex flowmeter is mainly used for industrial piping medium fluid flow measurement, such…

Products overview:
ZW - LUGB seriesSplit type vortex flowmeterUsing piezoelectric stress sensor, high reliability, can be in - 20 ℃ ~ + 250 ℃ temperature range.There are standard signal simulation and digital pulse signal output, easy with the computer and digital systems, is a more advanced, the ideal measuring instrument.In the high temperature medium, especially the steam measurement to guarantee the normal work of the instrument circuit part.Avoided because of the sensor signal lines within the support components lengthen the various influence on instrument measurement noise interference signal.
Second, the working principle:
ZW - LUGB seriesSeparation principle of vortex flowmeter is by the design in the flow field in the vortex, detecting sensor 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).
Applications:
ZW - LUGB seriesSplit type vortex flowmeter can be 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.Also can measure the turbid liquid containing small particles, impurities, and can be used as flow transmitter used in automatic control system.
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, selection of key points:
1, as far as possible not to use in the selection of flowmeter work flow in the lower limit value, so the meter diameter should be as small as possible, in order to obtain larger flow velocity and flow range.
2, the flowmeter should be used in the technical parameters of medium pressure and temperature range.Don't deliberately choose the high pressure level and ultra-high temperature instrument, should be selected according to the actual work pressure and temperature instruments, which had higher prices.
3, in the explosive dangerous location, should choose explosion-proof type flowmeter.
4, the lower flow rate depends on the operation condition of the medium density and kinematic viscosity, the maximum flow is generally not affected by medium pressure and temperature, so to determine the flow range as long as you determine the actual minimum flow can be available.Calculate the minimum flow rate, flow range check table to determine the appropriate diameter.
Seven, installation requirements:
1, the sensor can be installed indoors, can also be installed in the outdoor.Environmental conditions to conform to the requirements.
2, sensors should be installed in a horizontal, vertical or inclined (fluid flow from bottom to top) and its corresponding pipe nominal diameter.
3, sensors installed on a mechanical vibration of pipeline should be avoided.Should be considered when the vibration is inevitable, at about 2 dn from sensor before and after the straight pipe and fixing racks.
4, avoid install the sensor sensing has strong electromagnetic interference, thermal radiation, corrosive gas, the space is little, and maintenance is not convenient.
5, when measured medium contains many impurities, at the request of straight pipe upstream from sensors mounted outside the length of the filter.
6, either upstream or downstream of the sensor should be configured with a certain length of straight pipe, straight pipe inner surface should be clean, smooth, no obvious convex concave, fouling and peeling phenomenon.Its length should conform to the requirements of figure 2.Installation of the liquid sensor, near the pipe should be filled with liquid to be tested.
7, straight pipe diameter as far as possible consistent with the sensor size, if not consistent, slightly larger diameter than the sensor size should be adopted, the error to 3% or less is not more than 5 mm.
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:
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 meters.To guarantee the accuracy of the flowmeter measurement, reduce the measuring error, please note:
1, the selection of reasonable
Don't make the actual zui 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 appear 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,Installation specification management:

Vortex street 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, vortex flow timing design front end 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.

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

Twelve, selection of coding:

Thirteen,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.