Pulse output liquid turbine flow meter

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ZW - LWGY seriesPulse output liquid turbine flow meterColumn is the adoption of advanced ultra low p…

ZW - LWGY seriesPulse output liquid turbine flow meterColumn is the adoption of advanced ultra low power single chip microcomputer technology of vortex flow sensor and display the integration of integrating new intelligent instrument, adopts double row at the scene of the liquid crystal display, with compact bodies, intuitive and clear reading, high reliability, without external power supply interference, lightning resistance, low cost, obvious advantages.Instrument instrument correction coefficient of three, nonlinear intelligent compensation coefficient, and on-site correction.

Second, the working principle:
ZW - LWGY seriesPulse output liquid turbine flow meterThe working principle of shell is a fluid flowing through the sensor, as a result of the impeller blade and flow to a certain point of view, the fluid force makes the blade with rotational torque, to overcome the friction torque and fluid resistance, blade rotation speed stability after the moment balance, under certain conditions, the speed is proportional to the velocity of flow, because the blade has a magnetic conductivity, it is in the signal detector (composed of * magnetic steel and coil) magnetic field, rotating blade cutting lines, periodically changing coil magnetic flux, so that the coil ends induction electrical pulse signal, the signal after amplifier amplification plastic, form a certain amplitude of continuous rectangular pulse wave, can be spread far to display instrument, show the instantaneous flow and cumulative amount of fluid.Within the scope of a certain flow, pulse frequency f and flows through the sensor of fluid is proportional to the instantaneous flow rate Q, flow equation is: Q = 3600 x f/k;Type:
F - pulse frequency (Hz);
K - the instrument coefficient of sensor 1 / m3, given by the check list.If [1 / L] as the unit
Q - fluid transient flow (working conditions) (m3 / h),
3600 - conversion factor.
Coefficient of each sensor of the instrument in the calibration certificate will be completed by the manufacturer, set into the display instrument of form a complete set of k value, can show the instantaneous flow and cumulative total.
Applications:
ZW - LWGY seriesPulse output liquid turbine flow meterIs a precision flow measurement instrument, and the corresponding supporting flow integrating instrument can be used to measure the rate of flow of liquid and the total amount.Liquid turbine flowmeter is widely used in petroleum, chemical industry, metallurgy, scientific research in the areas of measurement and control system.Equipped with joint health liquid turbine flowmeter can be used in the pharmaceutical industry.
Four, the main features:
1, high quality alloy turbine flowmeter has higher steady flow and corrosion effect;
2 special bearings, imported high quality, long service life.
Isolated from the rest of 3 room, measuring room and ventilation, to ensure the safety of the instrument;
4, can be detected by measuring the temperature, pressure, and flow of the gas, can flow automatic tracking compensation, and displays a standard condition (Pb = 101.325 KPa, Tb = 293.15 K) the cumulative volume of a gas;Can be real-time query temperature and pressure values.
Five, the technical parameters:
1, high accuracy, generally up to + / - 1%, plus or minus 0.5%, R, R type high precision can be up to + / - 0.2% R;
2, good repeatability, short-term repeatability could reach 0.05% ~ 0.2%, it is because of good repeatability, such as regular calibration or online calibration can get high accuracy, flow meter in trade settlement is preferable;
3, have the instrument correction coefficient of three, nonlinear intelligent compensation coefficient, and can conduct site revision
4, all valid data after power off 10 years is not lost;
5, wide range of degrees, large caliber of 1:20, small diameter for 1:10;
6, structure is compact and lightweight, easy installation and maintenance, large flow capacity;
7, suitable for high pressure measurement, the instrument on the table need not opening, easy made from high pressure type instrument;
8, the types of special sensors, can design according to user's special needs for all kinds of special sensors, such as low temperature type, two-way, downhole, sand special, etc.;
9, can be made into type, suitable for large diameter measurement, small pressure loss, low prices, don't stop, easy installation and maintenance.
Six, structure and installation method:
1, instrument installation using thread connection and clamp type;
2, liquid flow direction when installation should be direction of arrow and indicating flow sensor shell, and a straight pipe upstream should be 6 D, or downstream straight pipe should be 5 D or higher measured pipeline measured diameter (D).
3, sensors should be far away from the external magnetic field, such as can't be avoided, necessary measures should be taken;
4, in order to not affect the normal delivery of the liquid, maintenance should be straight section on opposite sides of the sensor installation outside the by-pass pipe;
5, sensors, outdoor installation time, please prepare amplifier plug waterproof processing;
6, sensor and display instrument connection, should according to the power of the amplifier to choose connection mode, as shown in the relevant specification.
Seven, wiring and grounding considerations:
Wiring matters needing attention
1, using a full cable as soon as possible.
2, should as far as possible away from electrical noise (such as power transformer, electric motor and the power cord), avoid parallel to the power the power cord wiring.
3, Suggestions in the end of the thick wire adopts the tin welding clamping lugs.
4, for the waterproof and mechanical damage, the cable into the metal tube inside, but may not have high power transmission cables, within the same catheter (a transmission cable transmission of zui power is greater than the flowmeter signal cable transmission of small power 10 times, both cannot be installed on the same catheter).
5, the existing strong magnetic field outside the area, should make the axis of the detection device with the outside world vertical or the direction of the magnetic flux of the magnetic field with high permeability material for shielding flow sensor or external magnetic source.
6, explosion-proof type turbine flow sensor cable connection, must strictly abide by the relevant standards of explosion-proof amplifier.
Grounding problem
1, the shielding wire can only be grounded at one end, on display instrument grounding.
2, reliable grounding should be good, explosion-proof type grounding resistance should be less than 10 Ω.
The use of turbine flow time must pay attention to the points:
1, requires clean measured medium, low viscosity, corrosion resistance is small, do not contain impurities, in order to reduce the wear of bearing.If the liquid to be measured a grudge or containing gas, the flowmeter before venting device.In order to avoid damage of impurity in the fluid into the transmitter devious, and in order to prevent turbine stuck, add filters when necessary.
2, the installation of the flowmeter should avoid vibration, avoid magnetic field and thermal radiation.
3, medium density and viscosity changes have an impact on flow value, should be revised if necessary.
Eight, installation and use notice:
1, the turbine flowmeter shall generally be installed upright, straight-through flow meter can be horizontal, vertical (vertical flow shall be from bottom to top) or tilt installed on and its corresponding nominal diameter pipeline, and the casing on the arrow direction to the flow direction of medium and consistent.If straight-through flow meter should be installed vertically, should open the flow display, front cover, the panel and the LCD display turned 90 ° and the location of the readings.The work shall be carried out by on-site technical personnel, can be entrusted to the manufacturer to be modified before they go out.In order to facilitate the meter reading and reading, can be continuous flow display and four small screws removing the flow sensor, then flow meter display, forward or reverse turn 90 ° or 180 °) position, z after screwing in small and fastening screw.Meter if installed in outdoor, obstructions to prevent sun, rain and pollution, install section may not have a strong vibration and strong magnetic field interference.
2, in order to guarantee the accuracy of the measurement, should be not installed in the upstream flow regulating valve, straight pipe length shall not be less than 5 dn before table, the table after the straight pipe length should not be less than 3 dn, and flange connection type (low pressure) sealing washer must not into the pipe.Joint quickly mounted in welding entered should be welded the watch case and display again.
3, new pipe should use the bypass pipe water in front of the flowmeter using the stones within the pipeline, sediment, linen, silk, and rinse clean welding slag.If medium contains many impurities in use, the filter must be installed upstream, in order to avoid impurity blunt bad electrode, filter water area should be greater than the nominal diameter of 1.5 times the cross-sectional area.
4, when the liquid crystal display obvious value becomes weak or supply voltage is lower than 2.6 V, should be timely transform four sections of high-performance alkaline batteries.Replacement should open the display inside the back cover and the battery case cover plate, remove the battery and circuit for 1 to 2 minutes more electricity, after all is put on positive and negative mark again quickly put on the new battery, it can make the stored data display correctly.
5, display signal output terminal of the mouth can be flow signal transmission or with microcomputer system connected to the Internet.Wiring, unscrew the connection mouth M20 x 1.5 hexagon nut and rubber seal from the wiring inside the mouth into the press mark solid wiring terminals, and the hexagonal nut, put on the back cover.If it is a three wire system output, to 6 mm in three core sheathed shielded wire will each of the three core line in power supply, signal, grounded on the three terminal;If it is a two wire output (output) for the switch signal, to 6 mm in two core sheathed shielded wire will be 2 wire core, respectively in the signal, grounding on the two terminals.

Nine, the installation place:
1, the installation site should comply with the environmental temperature at 25 ~ 55 ℃ scope, humidity < 80% RH;
2, well ventilated, avoid sun and rain;
3, avoid in piping vibration or the place of stress;
4, avoid easily affected by the strong thermal radiation and radioactive places;
5, must avoid the outside strong electromagnetic field disturbance to the detection signal.If unavoidable, should be set on the amplifier of the flowmeter (sensor) shield and other measures to eliminate interference;
6, in the places where requires explosion-proof, and isolation amplifier should be adopted;
7, the installation position should consider ease of installation, operation, maintenance.

Ten, parameter table:

Eleven, measurement range and working pressure:

Twelve, selection of coding:

Note: DN15 ~ DN40 routine for the threaded connection, such as hope use flange connection, please add after the "nominal diameter," "(FL)"
For example: choose a flange connection type pulse type turbine flowmeter measurement of diesel, pipeline for DN40, pulse output signal, requires the accuracy of 0.5 on the Richter scale, 304 stainless steel material, instrument 16 mpa pressure measurement range for the standard range, the product model should be: ZW - LWGY - 40 (FL)/N / 05 / S/S/E/H16.

13 order, design selection guidelines:

1, instrument selection, as far as possible not to use the work flow in the lower limit value, so the meter diameter should be as small as possible, in order to obtain a larger flow rate 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 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.

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.