Large diameter turbine flowmeter

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Large-diameter gas turbine flowmeter is learned the flow meter at home and abroad advanced technolog…

Products overview:
ZW - LWQ seriesLarge diameter turbine flowmeterIs learned the flow meter at home and abroad advanced technology, optimized design has simple structure, light, high accuracy, good reproducibility, responsive, use the installation and maintenance is convenient wait for a characteristic of a new generation of turbine flowmeter, it is widely used in measurement in a closed pipe with 1 cr18ni9ti stainless steel, 2 cr13 and corrode corundum AI2O3, cemented carbide, and no fiber, particles and other impurities, motion viscosity temperature less than 5 x 10-6 m2 / s of the liquid, the kinematic viscosity is greater than 5 x 10-6 m2 / s of the liquid, can be used for solid liquid flow meter calibration after. If with display instrument with special function, can also be quantitatively controlled, excessive alarm, etc., is an ideal instrument to flow measurement and energy saving.

Second, the working principle:

ZW - LWQ seriesWorking principle of large caliber turbine flowmeter 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 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 - LWQ series of large diameter turbine flowmeter 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, the main features:
1, adopt new sensors, initiating flow, low pressure loss and vibration and pulsation flow resistance performance is good, not easy corrosion, good reliability, long service life.
2, adopting new type of microprocessor chip with high performance, high computing precision, the whole machine powerful, superior performance.
3, USES the advanced micro power consumption of new and high technology, low power consumption.Both can be used within the battery power supply to run for a long time, but also by external power supply mode.
4, according to the frequency of flow signal, instrument coefficient can be divided into eight automatic linear correction, can improve the calculation precision of instrument according to the needs of users.
5, block the EEPROM data storage technology, has the historical data storage and query function, three types of history data record way for users to choose.
6 meter, flowmeter can be 180 ° rotation, installation is simple to use convenient.
7, high accuracy, generally up to + / - 1.5%, plus or minus 1.0% R R.
8, good repeatability, short-term repeatability could reach 0.05% ~ 0.2%, it is because of good repeatability, flowmeter in trade settlement is preferable.
9, can be detected by measuring the temperature, pressure, and flow of the gas, can perform automatic tracking compensation, and displays a standard condition (Pn = 101.325 Kpa, Tn = 293.15 K) of the gas flow;Can be real-time query data such as temperature, pressure, time, date.
Five, the technical parameters:
1, the nominal diameter: pipeline: DN350-400 - mm;
2, precision grade: pipeline: plus or minus 0.5, plus or minus 1.0 on the Richter scale;Plug-in: 1.5 mm, 2.5 mm;
3, environmental temperature: - 20 ℃ to 50 ℃;
4, medium temperature: liquid measurement: - 20 ℃ ~ 120 ℃;Measuring gas: - 20 ℃ ~ 80 ℃;
5, the atmospheric pressure: 86 kpa to 106 kpa.
6, nominal pressure: 1.6 Mpa, 2.5 Mpa, 6.4 Mpa, 25 Mpa;
7, explosion-proof level: ExdIIBT4;
8, connection mode: threaded connection, flange clamp outfit, flange connection, plug, etc;
9, straight pipe requirements: gas: a straight pipe upstream should be 10 or more dn, downstream straight pipe should be 5 or more dn.
Liquid: straight pipe upstream should be 20 or more dn, downstream straight pipe should be 5 or more dn.
Plug-in: straight pipe upstream should be 20 or more DS, downstream straight pipe should be 7 or higher DS (DS for pipeline measured diameter);
10, display mode: (1) far eastone show: pulse output, the output current (match display instrument);
(2) the scene showed that eight LCD display cumulative flow, unit (m3);
Four transient flow, LCD display unit (m3 / h), battery, frequency, flow velocity;
(3) the temperature and pressure compensation type:
A, according to standard criteria for instantaneous flow and cumulative flow;
B, show the current pressure, temperature, battery voltage;
11, output functions:
(1) pulse output, p - p values determined by power supply;
Two wire (2) 4 ~ 20 ma current output;
(3) pulse output per unit volume and the original pulse sensor output;
(4) with RS485 communication interface;
12, power supply:
(1)DC5～24V； 
(2) the standard 3 v lithium battery installed on the instrument internal can use eight consecutive years;
(3) temperature pressure compensation type 3 v lithium battery installed within the instrument can be continuous use of more than 4 years;
13, transmission distance, to display, sensors can reach 500 m; 
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 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.

Eight, 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.
Nine, deposit should be paid attention to matters:
Gas turbine flowmeter 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, so as 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) the 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.
Ten, installation requirements:
1, before installation, pipeline purging, and in case of residual iron affect the normal operation of flowmeter.
2, before the installation, the use of tiny air blows the turbine, the turbine can flexible rotation, no random noise, count rotation is normal, uninterrupted card lag phenomenon, the flowmeter can be used to install.
3, in the middle of the flange and pipe flanges to add sealing washer.
4, before the gas meter shall be equipped with filters, temperament is dirtier occasions should add oil filter, before you place an order, can order to me at the same time, it is strictly prohibited to filter and flowmeter directly connected.
5, gas turbine flowmeter in the installation shall be added as of before and after the valve.
6, flange joint pipe Canon there should be no protrusions.
7, when installation, it is strictly prohibited in the import and export directly to where the flange welding, so as not to burn out flowmeter internal parts.
8, shall be installed in easy maintenance, strong electromagnetic interference and mechanical vibration and thermal radiation effects.
9, unfavorable use frequent interruptions in the flow, and have strong pulsation flow or pressure pulsation of the occasion.
10 and outdoor installation, should be the upper cover, to prevent rain water immersion and strong sunlight affect the service life of the meter.
11, can be horizontal or vertical installation, the fluid flow direction should be consistent with the direction of the logo on the shell, should guarantee the upstream of the flow meter is not less than 10 dn straight pipe, after the table is not less than 5 dn straight pipe.
12, in order not to affect the normal fluid transportation, it is suggested that according to the figure 2 by-pass pipe installation, must close the by-pass pipe valve when normal use.

11, using a note:
1, in the low pressure table z pressure leak detection: 1.0 Mpa, or less temperature pressure compensation type leakage pressure no more than three times the upper limit value of the pressure sensor.High pressure casing according to 1.2 times the rated flow pressure leak detection.
2, after installation leak test and installation shall comply with the following provisions:
A close vent valve and the inlet valve first.
B slightly open vent valve, and then slowly open the inlet valve, make the table start slowly, then slowly open the vent valve, make the reach normal operation state, to prevent sudden start, damage to the core.
C at the time of stopping air, need to close the vent valve, then close the inlet valve, each time you start all should abide by the rules.
After 3, install and use, not to touch the bolt, screw, nut fasteners, such as to avoid danger such as leakage, damage.
4, flow meter movement (temperament clean) should be once every six months for cleaning maintenance;(temperament is dirtier) should be cleaning maintenance once a month.
5, if the movement after breakdown maintenance, to be put into use, the need to press z pressure seal test first.And note within the movement precision instrument transformer oil or oil.

Twelve, parameter table:

13, selection of coding: 

For example, the model is: the ZW - LWQ - C - 350 - B - A - A gas turbine flowmeter, said:

Meter diameter of 50 mm, display, output way of live shows, output current measurement accuracy is 1.0%;Turbine types are measured normal flow range of intelligent large-diameter gas turbine flowmeter.

14, 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.