Explosion-proof type turbine flowmeter

Products overview:
ZW - LW seriesSpeed through the sensing coil to detect in a casing.When the turbine flowmeter blade cutting lines of magnetic force produced by casing * magnets, it could cause sensing coil in the magnetic flux changes.Sensing coil to detect the signals of magnetic flux cycles into the preamplifier, the signal amplification, plastic, is proportional to the velocity of the pulse signal, into the unit conversion and flow integrating circuit and display the accumulated flow value;Also converts pulse signal into frequency current circuit, the pulse signal is converted into analog electrical flow, which indicates the instantaneous flow values.
Integration of turbine flowmeter for explosion-proof design structure, can display the total flow, instantaneous flow and flow full percentage.Battery USES the long-lasting lithium-ion batteries, single-function integrating table battery service life can reach more than 5 years, multi-function display table battery service life also can achieve more than 12 months.
Integration of flow units is numerous, can display the meter has a cubic meters, gallons, liters, standard cubic meters, the standard and can be set fixed parameters of gas pressure and temperature compensation, little change in the situation of pressure and temperature parameters, the instrument can be used for integrating fixed compensation.
Second, the working principle:
ZW - the working principle of LW series explosion-proof type 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 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 - LW series explosion-proof type turbine flowmeter is a kind of precise flow measuring instrument, integrated turbine flowmeter for explosion-proof design structure, suitable for measuring the low viscosity of medium, such as water, diesel, gasoline, etc.With the corresponding flow integrating instrument can be used to measure the rate of flow of fluid and the total amount.Widely used in petroleum, metallurgy, scientific research in the areas of measurement and control system.
Four, 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.
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, 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.
Seven, 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.
Eight, 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.
Nine, use 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.

Ten, must pay attention to when using:
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.

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.