One-piece liquid turbine flow meter

• 

ZW - LWGY seriesOne-piece liquid turbine flow meterIs to adopt advanced technology of ultra-low powe…

ZW - LWGY seriesOne-piece liquid turbine flow meterIs to adopt advanced technology of ultra-low power consumption single chip microcomputer of the vortex flow sensor and display the integration of integrating new intelligent instrument, adopts double row at the scene of the liquid crystal display, a 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.High-definition LCD display (four significant figures) instantaneous flow and cumulative flow (eight significant figures, with reset function).
Second, the working principle:
ZW - LWGY seriesWorking principle of one-piece liquid turbine flow meter is a fluid flowing through the sensor shell, as a result of the impeller blade and flow to a certain point of view, the impact of fluid 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 there are magnetic conductivity blade, 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 seriesOne-piece liquid turbine flow meter is used to measure low viscosity the volume of a gas in a closed pipe flow and total amount.In petroleum, chemical industry, metallurgy, urban gas network industries has wide use value.

Four, display function:
1, according to standard criteria for instantaneous flow and cumulative flow; 
2, according to working condition of the working condition of the instantaneous flow and cumulative flow; 
3, according to the current pressure, temperature, battery voltage; 
4, shows the date and the clock.
Five, model and standard configuration:
ZW - LWGY type: basic sensor.Note: without the scene, according to the output pulse signal.Standard for the flameproof products.
ZW - LWGY - type A: 4-20 ma transmitter.Note: without the scene, according to the standard 4-20 ma output current signal.The standard for explosion-proof products (ExdIIBT6, explosion-proof number: CE061580).
ZW - LWGY - B: intelligent display on site.Note: double row liquid crystal header, the scene at the same time show the instantaneous flow and cumulative flow, lithium batteries, battery can use more than three years in a row, no signal output.The standard for explosion-proof products (ExdIIBT6, explosion-proof number: CE061580).
ZW - LWGY - C: intelligent integration type.Note: double row liquid crystal header, the scene at the same time show the instantaneous flow and cumulative flow, outside for 24 VDC, output standard 4-20 mA current signal, the standard for explosion-proof products (ExdIIBT6, explosion-proof number: CE061580).

Six, 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.
Seven, 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.
Eight, instrument type:
A, the scene display type:
The intelligent flowmeter is the use of advanced single chip microcomputer technology design of the new display instrument of the flow meter, and the flow sensor of pulse signal output (such as turbine, vortex.).It can display instantaneous flow and cumulative amount.Cumulative flow: eight digit, decimal point three significant figures.Instantaneous flow: six figures, but showed a litre.Display precision: plus or minus a display unit.Signal output: pulse output: 1 ~ 3000 hz for + 12 ~ + 24 VDC power supply output current: 4 ~ 20 ma away for + 24 VDC power supply (two wire system) built-in 2 section 3 v lithium battery power supply in parallel.When the voltage is lower than 2.7 V, the under-voltage directives flameproof.Small signal removal function.
B, pulse output type:
Working voltage: + + 12 VDC or 24 VDC two (customer order must be selected before a power supply).Signal transmission distance: less than 250 meters.Output signal, square wave signal amplitude: + 12 VDC power supply amplitude is about 10 v + 24 VDC power supply amplitude of about 20 v: amplifier and turbine flow sensor connection for the M16 x 1.5 thread, after the turbine flow sensor installation, twist to the turbine flow sensor, the amplifier with the hand twist to sense amplifier and then take the lock nut.Connection: type pulse output amplifier foreign lead with three root, red, white line and shielding.Is the power supply line, white line for pulse output and display, or other equipment connection, shielding grounding
C, 4 ~ 20 ma output type:
Outside the working voltage: 24 VDC power supply + (two wire system) output signal: 4 ~ 20 ma, or 1, 4-5 v ma corresponding to zero flow turbine flow sensor, 20 ma for turbine flow sensor zui large flow, flow range turbine flow sensor nameplate.Signal transmission distance: less than 250 meters.After the installation of turbine flow sensor installation, twist the amplifier to the turbine flow sensor (m16 x 1.5 thread), joint hands after twist to the sense amplifier has exactly bring tight lock nut.Connection: 4 ~ 20 ma output type amplifier foreign fuses with the red and white line.The red line for the power cord, white line for line.
D, fission remote display type:
Outside power supply working voltage: 220 vac signal transmission distance: less than 250 meters display instantaneous four: accumulative total nine display display size: horizontal type: 160 mm x 80 mm upright: 80 mm x 160 mm display with 4 ~ 20 ma output and can be connected to the computer.

Nine, installation reasons may lead to the problem:
1, the length of straight pipe upstream or downstream is insufficient;
2, instrument measuring pipe diameter and pipe diameter deviation;
3, install different heart, gasket convex tube;
4, instrument going backward;
5, detecting element is covered by impurities;
6, reduce the detection sensitivity, small leakage flow meter;
7, pipeline leak (installed in underground pipeline, for example, small leakage was found), valve leakage, by-pass valve leakage cause cumulative flow smaller (total);
8, there are two phase flow, pulsating flow influence the accurate measurement.

Ten, install and use the attention of the several items:
1, before put into operation for instrument coefficient setting, carefully check, determine the flow meter wiring and correct, grounding good rear can send;
2, regular cleaning of flowmeter, check and after school, lubricating oil or cleaning fluid into the mouth of the flowmeter, should be regularly according to the requirement of the specifications into lubricating oil or cleaning fluid, to maintain good impeller;
3, the condition of monitoring display instrument, estimates the meter reading, with exception to check in time;
4, keep clear of the filter, filter clogging situation from the entrance and exit to the increase of the pressure gauge reading is poor, a blockage in a timely manner to eliminate;
5, with turbine flowmeter for trade settlement, in order to ensure accurate and reliable measurement, must test on a regular basis.

Eleven, 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.
Twelve, 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 transmission cables zui 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.
13, after use or downtime, should pay attention to the following points:
Measured liquid 1, when using, should maintain clean, do not contain impurities such as fiber and particles.
2, when begin to use, should first will be slowly filled with liquid sensor, and then open the outlet valve, it is strictly prohibited to sensors in liquid state under high velocity impact.
3, maintenance cycle for half a year in general.Maintenance when cleaning, please note that you are the measuring chamber of damaged parts, especially in the impeller.Please watch the orientation and the position of the impeller when assembling.
4, need not when, should be clean inside the liquid, and on both ends of the sensor and protective cover, prevent dirt to enter, and then placed in a dry place preservation.
5, when with filter should be cleaned regularly, need not when, should clean the internal liquid, like sensors, dustproof set, placed in a dry place preservation.
6, transmission cable can be raised or direct buried, buried iron pipe should be set.)
7, before installation, and the first display instrument or oscilloscope connected wires, power supply, with my mouth to blow or hand dial the impeller, make its rapid rotation observations have showed that sensor installation again when have shown.

14, parameter table:

15, measurement range and working pressure:

16, 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 explosion-proof diesel type turbine flowmeter measurement, pipeline for DN40, site need to display and remote transmission current signal, the required 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) / / 5 C/S/S/E/H16.

In the 17th and designing order 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.