Stainless steel turbine flowmeter

Products overview:
ZW - LW seriesIs learned the flow meter at home and abroad advanced technology, optimized design has simple structure, light, high accuracy, good reproducibility, responsive, installation and maintenance convenience and so on the 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 Al2O3, cemented carbide, and no fiber, particles and other impurities, motion viscosity temperature less than 5 x 10 m/s of the liquid, the kinematic viscosity is greater than 5 x 10 m/s liquid, can be used for solid liquid flow meter calibration after., together with display instrument with special functions can also be quantitatively controlled, excessive alarm, etc., is an ideal instrument to flow measurement and energy saving.

Second, the working principle:
ZW - LW seriesStainless steel turbine flowmeter is a fluid flowing through the principle of 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 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 - LW seriesThe quantity of stainless steel turbine flowmeter sensor and display instrument of form a complete set of turbine flowmeter.Sensor has high precision, good repeatability, long life characteristics such as simple operation.Can be widely used in petroleum, chemical industry, metallurgy, paper making industries such as measuring the volume of fluid transient flow and the total volume.
Four, the main features:
1, small pressure loss, impeller has antiseptic function;
2, USES the advanced ultra low power single chip microcomputer technology, the machine has strong function, low power consumption, superior performance;
3, which has the function of nonlinear compensation accuracy intelligent traffic monitor.Accuracy of correction formula is better than that of + / - 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, reliability;
Block 5, the EEPROM to cumulative flow, instrument coefficient of power-fail protection, protection of more than 10 years;
6, using central processing unit (CPU), high performance MCU to complete data collection, processing and display output of cumulative flow transient flow with;
7, convenient screen man-machine interface, data transmission in the form of standard 485;
8, the whole hard alloy (tungsten carbide) shielding cantilever beam structure bearing, integrating rotating bearing with pressure bearing, bearing life can be greatly improved, and can work in a small amount of sediment and dirt in the medium of;
9, with 1 cr18ni9ti stainless steel construction and all (turbine adopts 2 cr13) anti-corrosion performance is good;
10, easy maintenance, since the structure of the rectifier, smaller and lighter, simple structure, can be combined in a short period of time to open it, internal cleaning single;
11, have a stronger ability to resist magnetic disturbance and vibration, reliable performance, long service life limit velocity is low, wide measuring range.
12, the LCD shows clear intuitive display type, low power consumption, 3 v lithium batteries can run more than 5 years in a row, corrosion resistance, suitable for acid and alkali solution.

Five,Technical parameters:
1, the nominal diameter: pipeline: DN4 DN200 ~;Insert: DN100 ~ DN2000;
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, sensors to display the distance up to 500 m.

Six, 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.
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 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
Nine, piping requirements:
1, to eliminate the pipe cross section's influence on the accuracy of measurement, uneven distribution of flow velocity and flow sensor should have certain straight pipe upstream and downstream, or install the straight pipe to replace part of rectifier.In general, the straight pipe upstream of not less than 15 D, downstream straight pipe not less than 5 D for nominal flow sensor size (D).
2, in order to eliminate the circumfluence, the velocity distribution and the influence of the rotational flow, can be in the upper mount rectifier, the upstream flow sensor can be part of the straight pipe length L = 10 d, if for 15 ~ 20 d, the accuracy of measurement calibration precision can be achieved.
3, when the solid impurities in the liquid to be tested should be installed upstream of the flow sensor filter, filter mesh for 20 ~ 60 mesh (3 ~ 9 eyes/cm2), average flow sensor diameter small orders for more.Filters the installation position should be considered for disassembling of filter.
4, mixed with gas in the liquid or measuring, easy vaporization of liquid should be installed air separator (gets).
5, if the measured liquid gasification, in order to prevent air pockets, the outlet pressure of flow sensor should be higher than the calculated value of type Pmin:
Pmin = 2 in the delta P 1.25 Pv type: Pmin - zui low pressure;Delta P - zui under heavy traffic flow meter of pressure loss;
Pv - zui using high temperature measured liquid saturation vapour pressure
6, through traffic flow sensor is too large, can make the bearing life is too short, usually by valve will flow to the right size, the valve should be installed downstream of the meter.
7, in order to not interrupt fluid conveying in maintenance, is usually installed upstream and downstream of the flow sensor cut-off valve, at the same time set the by-pass pipe, and shall ensure that when measuring the by-pass tube in the by-pass valve closing is not leak.
8, if there is likely to produce reverse flow, should add the check valve, in order to prevent the fluid flow.
In September and flow sensor should be one of pipe, seal shall not be protruding into the pipe.
Gathered gases within 10, in order to avoid the flow meter, flow meter should not be installed in both horizontal zui highs.
11, if the low point of the flow meter installed in the pipeline, should install drain valve in the pipeline, to discharge sediment on a regular basis.
12, flow sensor before and after the pipe should be supported, no obvious vibration.
13, the new laying pipelines for cleaning, shall be installed in the part of the flow sensor to access a short tube, first to be clean before mount flow sensor.
14, need to measure the temperature of the fluid, in the downstream of the flow sensor 5 times the length of the pipe nominal diameter measurement.
15, need to measure the pressure of the fluid, in the upstream flow sensor 10 times the length of the pipe nominal diameter measurement.
Ten, 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.

Eleven, measurement range and working pressure:

1, ZW - LWGQ series gas turbine meter:

2Turbine flowmeter, ZW - LWGY series liquid:

Twelve, selection of coding:

1, LWQ series gas turbine flowmeter selection:

2, LWGY series liquid turbine flowmeter selection:

13, the design and order guidelines:
1, you should pay attention to when ordering turbine flow sensor based on fluid nominal diameter (DN), work pressure (Mpa), temperature (℃), the flow range (m3 / h), fluid types and environmental conditions to choose the appropriate specifications.When have explosion-proof requirements must choose explosion-proof type sensor, and strict attention to explosive-proof grade.
2, need to jiangsu wei display instrument of form a complete set, please refer to the corresponding specifications, choose suitable model, or the information provided by our company technical personnel according to your designs for you selection.Indicate the specifications when you need to use the transmission signal cable length.

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.