Battery power vortex flowmeter

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Battery power supply principle of vortex flowmeter is using liquid vibration and the development of …

Products overview:
ZW - LUGB seriesBattery power vortex flowmeterAdopting micro power consumption of new and high technology, the use of 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.Mainly used in industrial pipeline medium fluid flow measurement, such as gas, liquid and vapor, and other media.Is characterized by small pressure loss, wide range, high precision, working condition of the measurement volume flow is almost not affected by the fluid density, the influence of the parameters such as pressure, temperature, viscosity.No moving mechanical parts, so high reliability, small amount of maintenance.Instrument parameters can be long-term stability.Vortex street flowmeter using piezoelectric stress sensor, high reliability, can be in - 20 ℃ ~ + 350 ℃ 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.
Second, the working principle:
ZW - LUGB seriesBattery power supply principle of vortex flowmeter is by the design in the flow field in the vortex body, detection probe 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 seriesBattery power vortex flowmeter can be widely used in large, medium and small various water supply and drainage pipe, industrial circulation, sewage treatment, oil and chemical reagent and compressed air, saturation and superheated steam, gas and all kinds of medium flow rate measurement.
Four, the main features:
1, simple structure and strong, have no moving parts, high reliability, long running is very reliable.
2, installation is simple, maintenance is very convenient.
3, detection sensor is not direct contact with the measured medium, stable performance and long service life.
4, the output is the pulse signal is proportional to the flow, no zero drift, high precision.
5, wide measuring range, range than can reach 1:10.
6, small pressure loss, low operation cost, more energy saving.
7, in a certain range of Reynolds number, the output signal frequency is not affected by changes in the fluid physical properties, and components, instrument coefficient only involved in the body shape and size of the vortex, fluid volume flow measurement without compensation, generally need to calibration instrument coefficient after changing accessories.
8, wide application range, steam, liquid, gas flow rate can be measured.
Five, the technical parameters:
1, the measured medium: liquid, gas, saturated steam and superheated steam.
2, precision grade: liquid plus or minus 1.0%, gas (vapor), plus or minus 1.5%, plug-in plus or minus 2.5%.
3, working pressure: 1.6 MPa, 2.5 MPa, 4.0 MPa, 6.4 MPa.
4, medium temperature: regular - 40 ~ 150 ℃ temperature type - 40 ~ 250 ℃ high temperature type - 40 ~ 350 ℃.
5, the output signal: three line voltage pulse, low level 0 ~ 1 v, high level > 4 v, 50% duty cycle;Two wire standard 4 ~ 20 ma current;Current 0 ~ 10 ma three-wire system standards.
6, work environment: - 35 ℃ ~ + 60 ℃, humidity 95% RH or less.
7, working power supply: DC12V;DC24V.
8, the shell material: carbon steel, stainless steel.
9, explosion-proof type: this type ExibIICT6 Ann.

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, 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 limit of vortex street flowmeter flow 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.
Nine, 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.

Ten problems need to pay attention to during using, debugging:
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.
Eleven, install and use should be paid attention to in the items:
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.

Twelve, flowmeter selection guidelines:

Determine the structure of the sensor

1, connection mode: flange card mounted body without flange (table) or flange connection type (table body itself with flange).General advice to choose flange mounted, because of its compact structure, low price, and short delivery cycle.

2, the structure type: one-piece structure and split type structure.Generally USES the one-piece structure, only on special occasions, adopts the split type structure (such as: medium at high temperature, environmental temperature or humidity is high, with the scene display for easy reading).

3, display mode: no scene shows, with the scene display and carry only the scene.Scene shows refers to on the header is equipped with LCD display, can display the cumulative flow and transient flow parameters, such as.

4, the signal output way: the pulse signal output and 4 ~ 20 ma current standard signal output.The pulse signal output normally recommended, because directly and vortex shedding frequency corresponding to the pulse signal, without conversion, has a zui high accuracy;At the same time, in the usual transmission distance, pulse signal transmission effect is better.Standard and is commonly used in current signal output terminal or control system of the flow measurement system.

5, explosion-proof forms: the explosion proof type and safety explosion-proof type.If the medium to be measured is flammable and explosive substances or measuring environment is flammable and explosive substances, should choose explosion-proof type.

Determine the configuration of the vortex flowmeter:

1, the density compensation:

When measuring the mass flow rate of steam, due to its density changes with the change of temperature and pressure, so to compensate for steam, at any time with a platinum thermal resistance and pressure transmitter with vortex sensor with mass flow measurement system.There is a measurement of saturated steam and superheated steam, to be stable if the temperature and pressure to reduce the equipment cost, can also according to the working state, by setting a fixed value density compensation.Other media can according to the actual situation of mass flow measurement system.

2, of intelligent flow totalizer.especially options:

Requires only display parameters, can choose digital display or LCD display; intelligent flow totalizer.especiallyNeed to trace the historical data, with memory function, should choose intelligent flow settlement paperless recorder;Measure the full and steam, should choose with automatic temperature compensation density or pressure; automatic compensation of density flow totalizer.especiallyMeasurement of superheated steam, should choose along with temperature and pressure compensation density flow integrating instrument;Using the remote communication, should consider intelligent flow totalizer.especially with RS485 and RS232 communication interface.Requirements and control system of the flow measurement system, intelligent flow integrating instrument should take 4 ~ 20 ma standard current signal output interface;

When needed, should configure a backup power supply, so that all of a sudden power failure meter can be measured normal.When needed, should with meter box, place the intelligent flow integrating instrument, instrument box, with a lock made of intelligent flow totalizer.especially set parameters cannot be adjusted freely, with anti-theft function, at the same time, the instrument is equipped with protection circuit in the oven, play a role of protection of intelligent flow totalizer.especially.

3, remote monitoring: in need multi-point measurement, distribution area is larger, the need for real-time monitoring, can use the GSM/GPRS communication network or wireless private network remote traffic monitoring system, realize real-time monitoring and management of the pipeline flow.

4, the determination of the calibre of the sensor, the sensor diameter is different, its measuring range is different, and each kind of caliber its measuring range as the measured medium type and condition of the change of temperature, pressure change, first determine the medium under the working condition.

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

14, selection of coding:

15,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.