Stainless steel gas turbine flowmeter

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ZW - LWQ series stainless steel gas turbine meter adopts advanced ultra low power single chip microc…

ZW - LWQ series stainless steel gas turbine meter adopts advanced ultra low power single chip microcomputer technology of turbine flow sensor and display the integration of integrating new intelligent instrument, through the micro processing unit consists of temperature and pressure testing of analog channel, the flow sensor channel acquisition signal is carried out in accordance with the gas equation of temperature and pressure compensation, automatic compression factor correction, on the LCD screen will all data (instantaneous flow and cumulative flow rate and the total cumulative flow, temperature, pressure, time, date and battery) intuitive display, and to output condition, standard of pulse signal, 4-20 ma, RS485 communication and so on the many kinds of communication signals.
Second, the working principle:
ZW - LWQ seriesStainless steel gas turbine flowmeter is a fluid flowing through the principle of 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 seriesStainless steel gas turbine flowmeter is a kind of precise flow measuring, has the 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, high accuracy, plus or minus 1%, plus or minus 0.5%, plus or minus 0.2%. 
2, good repeatability, short-term repeatability could reach 0.05% ~ 0.2%, is a preferable flow meter in trade settlement. 
3, the output pulse frequency signal, is suitable for the total measurement and computer connection, no zero drift, strong anti-jamming capability. 
4, can obtain very good frequency signal (3-4 KHZ), strong signal resolution. 
5, the structure is compact and lightweight, easy installation and maintenance, the flow capacity is big. 
6, suitable for high voltage measurement, instrument on the table without hole, easy to made into high pressure type instrument. 
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 than: ";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; 
Output signals: sensors: pulse frequency signal, low level high level 8 V or 0.8 V or less; 
Transmitter: two wire system 4-20 ma current signal or 1-5 v voltage signal; 
Power supply: sensors: + 12 VDC and + 24 VDC transmitter: + 24 VDC site shows: 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, turbine flowmeter 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
Ten, turbine flowmeter installation position and location:
In order to guarantee high measuring accuracy, flow meter (sensor) should be installed in horizontal pipe runs horizontally, and makes the flow sensor indicates flow direction arrow on the consistent with the flow of liquid.If must be installed vertically, should make the flow of liquid from bottom to top, to ensure that the body of the flow sensor is full of liquid.
11, turbine flowmeter, 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.
Twelve, 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.

13, parameter table:

14, measurement range and pressure rating:

15, 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.

16, 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.