The thread type liquid turbine flow meter

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ZW - LWGY series screw type liquid turbine flow meter is composed of turbine flow sensor and display…

ZW - LWGY series screw type liquid turbine flow meter is composed of turbine flow sensor and display instrument, is our factory adopts the advanced foreign technology manufacturing is one of liquid measurement zui ideal flowmeter.Flow meter has simple structure, high precision, convenient in installation and maintenance, etc.The products are widely used in petroleum, chemical industry, metallurgy, water supply, paper making, environmental protection, food and other fields, and is suitable for the measurement in a closed pipe with 1 cr18ni9ti stainless steel, 2 cr13 and corrode corundum Al2O3, cemented carbide, and no fiber, particle impurities such as liquid.If with display instrument with special functions, can automatically quantitative control, such as excessive alarm purposes.
Second, the working principle:
ZW - LWGY seriesThread type liquid turbine flow meter is when the fluid flows 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 - LWGY seriesThread type liquid turbine flowmeter is a kind of precise flow measuring instrument, and the corresponding supporting 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 liquid turbine flowmeter sensor can be used in the pharmaceutical industry.
Four, the main features:
1, small pressure loss, impeller has antiseptic function.
2, has the high resistance to electromagnetic interference and shock resistant capacity, 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 flow display precision.
Device.The accuracy of correction formula 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.
Five, the technical parameters: 
1, meter specifications, the basic parameters and performance indicators
Parameters (see table)
2, the accuracy of: 0.5, 1.0;
3, the conditions of use:
（1）Ambient temperature - 20 ℃ to 50 ℃;
（2）Relative humidity: 5% ~ 95%;
（3）The temperature measured medium: - 20 ℃ ~ 120 ℃;
（4）The atmospheric pressure: 86 kpa to 106 kpa.
（5）Explosion-proof level: the ib ii bt4.
4, signal transmission distance, the distance of the sensor to monitor up to 1000 m.
Six, electrical characteristics:
1, the display mode:
(1) far eastone show: pulse output (match display instrument);
(2) the scene shows: seven LCD display accumulated flow rate, the unit (m3)
Seven LCD display instantaneous flow rate, the unit (m3 / h)
(3) turbine flow transmitter: (with a display instrument).
2, the output function:
(1) pulse output, p - p values determined by power supply;
(2) with pulse output or two wire system 4 ~ 20 ma current output;
Two wire (3) 4 ~ 20 ma output current.
3, power supply:
（1）dc5~24v；
(2) 3 v lithium battery installed within the instrument can use eight consecutive years;
（3）dc24v。 
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,Instrument structure and installation method: see (table 2), (figure 1), (figure 2)： 
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 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.

Eleven, flow range and working pressure:

Twelve, parameter table:

13, selection of coding:

14, 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.