Gas turbine flowmeter

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Gas turbine meter adopts advanced ultra low power single chip microcomputer technology of turbine fl…

Products overview:
ZW - LWQ seriesGas turbine flowmeterUSES the advanced ultra low power single chip microcomputer technology of turbine flow sensor and display integration of integrating new intelligent instrument, the 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.Instruments have instrument coefficient of correction at six 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).All valid data after 10 years is not lost when power supply drop.This kind of turbine flowmeter are explosion-proof products, explosion-proof level for: ExdIIBT6.
The turbine meter according to the power supply mode, have far eastone signal output can be divided into ZW - LWQ - a/B and ZW LWQ -- - C.
ZW - LWQ - - B: power supply using 3.2 V10AH lithium batteries (can run continuously 3 years);No signal output function.
ZW LWQ -- - C: 24 VDC power supply, power supply adopts two wire output standard 4-20 ma current signal, and can need according to different site, can increase the RS485 or the HART communication.

Second, the working principle:
ZW - LWQ seriesWorking principle of gas turbine flowmeter is a fluid flowing through the sensor shell, because of the impeller blade and flow to a certain Angle, 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 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 of inductive electric 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 the 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 - LWQ seriesGas turbine flowmeter is learned the flow meter at home and abroad advanced technology optimized design, integrated the theory of gas mechanics, fluid mechanics, electromagnetism and developed a new generation of high precision, high reliability of gas precision measuring instrument, has a good performance of low pressure and high pressure measurement, multiple way signal output and low sensitivity to the fluid disturbance, is widely used in natural gas, coal gas, liquefied gas and light hydrocarbon gas and gas metering.
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, the classification: 
1, LWQ ZW - - A remote display: output current (match display instrument); 
2, ZW - LWQ - B scene shows: seven LCD display, cumulative flow unit (m3) seven instantaneous flow, LCD display unit (m3 / h) (with Chinese characters display operator); 
3, ZW - LWQ - C scene shows: the scene shows with 4 ~ 20 ma or pulse output + 24 v power supply; 
4, ZW - LWQ - D temperature and pressure compensation type.

Six, the main features:
1, wide measuring range, the lower velocity of less than 0.5 m/s, small pressure loss, the impeller impact resistant ability.
2, has the high resistance to electromagnetic interference and vibration resistance, self-lubricating bearing adopts full sealing isolation protection, performance reliable working life is long.
3, USES the advanced ultra low power single chip microcomputer technology, the whole machine function is strong, low power consumption, superior performance.With nonlinear compensation function of intelligent traffic monitor precision.Accuracy is better than that of plus or minus 0.02%.
4, meter coefficient can be set up by the key online and can be displayed on the LCD screen, LCD screen clear intuitive, high reliability.
5, block the EEPROM for cumulative flow, instrument coefficient of power-fail protection.To protect more than 10 years.
6, can be in the measured gas pressure compensation under stable state of stress.
Seven,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, 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.
Ten, installation site:
1, the installation site should comply with the environmental temperature at 25 ~ 55 ℃ scope, humidity (80% RH
2, well ventilated, avoid insolation, drench
3, avoid in piping vibration or stress
4, avoid easily affected by the strong thermal radiation and radioactive
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 the 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
Eleven, 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.

Twelve, storage precautions: 
Gas turbine arrival should be installed in a timely manner.For a battery-powered LRT -i header, not when using the power pin should be placed in the "OFF" (OFF) position, in order to avoid battery depletion affect the service life of the battery.If you want to deposit, please pay attention to the following items:
A, the possible conditions, do not open the packing cases.
B, if already opened the package, or have used the instrument, please put the LRT -i header power jumper wire inserted in the "OFF" position, and use the original packaging.
Location should meet the following conditions:
A, rain moistureproof.
B, small mechanical vibration, avoid collision impact.
C, temperature in - 30 ~ + 60 ℃.The ideal temperature at 25 ℃ or so.
D, such as stored in outdoor, instrument performance will be affected.So if the instrument to the installation location, will install as soon as possible.

13, installation considerations:
1, before setting, pipeline purging cleaning, in case the residual iron affect the deformation of flowmeter operation.Before the installation, use and easy flow blowing turbine, the turbine can turn the motor, and no random noise, filling ink revealed performance is normal, the meter can be installed applications.Grace flow meter installed at the flange pipe flange two head to also add sealing washer.Meter shall be equipped with filters, temperament is dirty places should be equipped with oil filter, before you place an order, can order to my company at the same time, it is strictly prohibited to filter attached directly to the flowmeter. 
2, successively when installation should be added by the valve.Flange coherent pipe diameter in adjacent shall not have arisen.To install flowmeter, it is strictly prohibited in its development into the inlet flange place directly welding, province burn Clinton meter outside the machine.Meter should be installed in easy to repair, no strong electromagnetic dry heat invasion, the places where machine vibration and thermal radiation effects.Frequent flowmeter was used in the traffic and the end of the places where violent pulsating flow or pressure pulsation.Meter outdoor installation, should be the upper cover, to prevent rain in the scorching sun exposure, affect the service life of the meter.Flow meter can be installed in vertical or horizontal, fluid motion should be partial to be partial to different with logo on the shell, the flow meter of crude should can have not less than 10 dn straight pipe, after the table is not less than 5 dn straight pipe. 
3, walked in order not to affect the normal fluid, pioneered by figure 2 install bypass pipe, the misshapen make diachronic must close the by-pass pipe valves.In pipeline construction, should try to install about telescopic pipe or bellows, in order to avoid the flow meter of serious tension or fracture;Should indeed life entrance and flowmeter and import of adjacent coaxial, and avoid washer and weld, into the pipe or disturbs the flow profile.Adopt external power, the flow meter must be reliable grounding, but shall not be Shared with heavy current futile ground, when pipeline installation or maintenance, can't leave the ground and flowmeter lap welding futile.Pipeline sealing test set to complete development, should hope that flowmeter pressure sensor can suffer zui high pressure (i.e., zui appraisal certificate on medium pressure), in order to avoid damage of Clinton pressure sensor.

14, parameter table:

15, measurement range and pressure rating:

16, selection of coding:

For example, the model is:ZW-LWQ－C－50－B－A-AThe gas turbine flowmeter, said:
Meter diameter for50mm, display and output way of live shows, the output current for measuring precision1.0%;Turbine types are measured normal flow range of stainless steel type gas turbine flowmeter.

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.