Thread type gas turbine flowmeter

ZW - LWQ seriesThread type gas turbine flowmeterDesigned for explosion-proof 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 - LWQ seriesThread type gas turbine flowmeter is when the fluid flows through 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 seriesThread type gas turbine flowmeter is a kind of precise flow measuring instrument, matched with the corresponding flow integrating instrument can be used to measure the rate of flow of liquid and the total amount.Widely used in petroleum, chemical industry, metallurgy, scientific research in the areas of measurement and control system.Equipped with health joints threaded connection type turbine flowmeter sensor can be used in the pharmaceutical industry.
Four, the main features:

1, high accuracy, generally up to + / - 1%, plus or minus 0.5%, R, R type high precision can be up to + / - 0.2% R;

2, good repeatability, short-term repeatability could reach 0.05% ~ 0.2%, it is because of good repeatability, such as regular calibration or online calibration can get high accuracy, flow meter in trade settlement is preferable;

Total 3, the output pulse frequency signal, and is suitable for metering and connected to the computer, no zero drift, strong anti-interference ability;

4, can obtain high frequency signal (3 ~ 4 KHZ), strong signal resolution;

5, wide range of degrees, large caliber of 1:20, small diameter for 1:10;

6, structure is compact and lightweight, easy installation and maintenance, large flow capacity;

7, suitable for high pressure measurement, the instrument on the table need not opening, easy made from high pressure type instrument;

More than 8, with type sensor type, can design according to user's special needs for all kinds of special sensors, such as low temperature type, two-way, downhole, sａnd special, etc.;

9, can be made into type, suitable for large diameter measurement, small pressure loss, low prices, don't stop, easy installation and maintenance.

Five, the technical parameters:
1, meter diameter: threaded connections: 4, 6, 10, 15, 20, 25, 32, 40;
2, flange connection: (15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200;
3, plug-in: more than 200;
4, range than: ";1:15.1;
5, instrument material: stainless steel 304, 316 (L) stainless steel, etc;
6, medium temperature: - 20 ℃ ~ + 120 ℃;
7, the environment temperature: - 10 ℃ ~ + 55 ℃;
8, relative humidity: 5% ~ 9%;
9, atmospheric pressure: 86 ~ 106 kpa;
10, output signal, sensor, 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;
11, power supply, sensor: + 12 VDC and + 24 VDC transmitter: + 24 VDC site shows: instrument with lithium batteries;
12, explosion-proof forms: basic not explosion-proof, explosion-proof type;
13, protection grade: IP65, IP67.

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, 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
Eight, directions for use:
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.
Nine, installation requirements:
1, the turbine flowmeter installation using the flange connection, threaded connection and mounted;

2, liquid flow direction when installation should be direction of arrow and indicating flow sensor shell, and the straight pipe upstream should be 6 or higher DS, downstream straight pipe should be 5 or more DS (DS for pipeline measured diameter) to be tested.
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 on both ends of the sensor installation outside the straight section of the bypass pipe ((as shown in figure 4);

5, sensors, outdoor installation time, please prepare amplifier plug waterproof processing;
6, sensor and display instrument connection, should choose connection mode according to the power of the amplifier.
Ten, 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 z small power of 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.

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 zui 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－C－25－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 intelligent thread link 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.