Far eastone gas turbine flowmeter

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ZW - LWQ seriesFar eastone gas turbine flowmeterItself does not have the scene display, only the tra…

ZW - LWQ seriesFar eastone gas turbine flowmeterItself does not have the scene display, only the transmission of traffic signal far out.Traffic signals can be divided into the pulse signal or 4-20 ma current signal, low price, high integration, small size, especially suitable for display instrument and instrument for computer control system, PLC, DCS, etc.This kind of turbine flowmeter are explosion-proof products, explosion-proof grade for ExdIIBT6.Equipped with health joint turbine flow sensor can be used in the pharmaceutical industry, far eastone turbine can also be connected to the control room of the secondary instrument, integrating, transport, communication and control functions.

Second, the working principle:
ZW - LWQ seriesFar eastone working principle of gas 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 - LWQ seriesFar eastone gas 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, the main features:
1, sensor is cemented carbide bearing thrust type, not only guarantee the accuracy, and improve the wear resistance.
2, simple structure, strong and tear open outfit is convenient.
3, wide measuring range, low threshold velocity.
4, small pressure loss, good repeatability, high precision.
5, have a high resistance to electromagnetic interference and vibration resistance.
Five, the technical parameters:
Meter diameter: threaded connections: 4, 6, 10, 15, 20, 25, 32, 40;
Flange connection: (15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200;
Insert: more than 200;
Range scale: 1:10;1:15.1;
Instrument material: stainless steel 304, 316 (L) stainless steel, etc;
Medium temperature: - 20 ℃ ~ + 120 ℃;
Ambient temperature: - 10 ℃ ~ + 55 ℃;
Relative humidity: 5% ~ 9%;
The atmospheric pressure: 86 ~ 106 kpa;
Power supply: the scene display type: instrument with lithium batteries;
Explosion-proof forms: basic not explosion-proof, explosion-proof type;
Protection grade: IP65, IP67.
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, 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.
Eight, 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.
Nine, use requirements:
Measured liquid 1, when using, should maintain clean, do not contain impurities such as fiber and particles.
2, sensors, at the beginning of the use should be to slowly filled with liquid sensor, and then open the outlet valve (the valve should be installed in the back-end flow meters), it is strictly prohibited to sensors in liquid state under high velocity impact.
The maintenance period of 3, sensors, generally for half a year.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, sensors, need not when, should be clean inside the liquid, dry and after on both ends of the sensor and protective cover, prevent dirt to enter, and then placed in a dry place preservation.(this is very important)
5, with the 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 cables, the sensor can be raised or buried (buried iron pipe should be set.
7, in front of the sensor 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.If no display, should check the relevant parts, troubleshooting.

Ten, installation site:
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.

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, measurement range and pressure rating:

14, selection of coding:

For example, the model is:ZW-LWQ－A－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 remote transmission type gas turbine flowmeter.

15 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.