Intelligent metal tube flow meter

ZW - LZ seriesHave local display and intelligent remote transmission, with a pointer display instantaneous/cumulative flow, liquid crystal display (LCD), the lower limit alarm output, cumulative pulse output, batch control, the standard two wire 4 ~ 20 ma output current, and other forms.Provides users with a very broad choice space.The other the instrument adopts the advanced central microprocessor chip and high quality industrial components.Can choose a different sounding pipe form according to the customer's request, has further perfect in maintenance and cleaning.

Second, the structure and working principle:
1, the structure:
ZW - LZ seriesIntelligent metal tube flow meter is mainly composed of three parts:
A, indicator (intelligent indicator, on-site indicator);
B, float;
C, tapered measuring room.
2, how it works:
Bottom-up measured medium by the conical float to the top and bottom side of the differential pressure measurement of a tube formed upward force, when the float upward force is greater than the baptism by float weight in the fluid, float up, clearance area increase, immediately drop the gaps in the fluid flow, float up and down the differential pressure is reduced, on the float upward force as well as to reduce, until the upward force equal to the float weight immersed in the fluid, the float is stable at a certain level.The discretion of the float position that corresponds to the size of the measured medium flow.Move up and down in float float the built-in magnet steel, medium, magnetic field changes with the movement of the float.
Type a, for in situ by in situ indicator of the rotating magnet steel and the float inside the magnetic coupling, and turning, drives the pointer at the same time, through the dial indicates the size of the flow at this time.
B, for intelligence, an intelligent indicator in the solid state magnetic sensor to the change of the magnetic field into electrical signals, after A/D conversion, microprocessor, D/A output, LCD liquid crystal display (LCD), to show the size of the flow rate and cumulative flow.
Applications:
ZW - LZ seriesIntelligent metal tube flow meter is commonly used in industrial automation process control of a variable area flow meter.It has small volume, wide detection range, convenient use, etc.It can be used to measure the rate of flow of liquid, gas and steam, especially suitable for low velocity of small flow of medium flow measurement.
Four, the main features:
1, solid type all-metal structure design;
2, the independent conceptual design measurement indicator;
3, is available in stainless steel, and hartz alloy, titanium, PTFE material measurement system;
4, low pressure loss design;
5, short stroke, small structure design, and 250 total height;
6, magnetic coupling structure to ensure that the data transmission, signal is more stable;
7, heat preservation, or heating jacket;
8, vertical, horizontal, all kinds of installation method is more suitable for different occasions.
9, suitable for small diameter and low velocity medium flow measurement;
10, reliable operation, less maintenance, long service life.
11, for the straight pipe requirements is not high;
12, wide flow rate ratio 10:1;
13, double row big liquid crystal display, optional site, according to the instantaneous/cumulative flow can take backlight;
14, uniaxial sensitive indicator;
15, non-contact magnetic coupling transmission;
16, all-metal structure, suitable for high temperature, high pressure and strong corrosive medium;
17, can be used in inflammable and explosive dangerous places;
18, choose two wire, batteries, communication power supply way;
19, multi-parameter calibration function;
20, with data recovery, data backup and power-fail protection function.
Five, the technical parameters:
1, the measuring range: water (20 ℃) 1-200000 l/h air (20 ℃ and 0.1013 mpa) 0.03-4000 m3 / h see flow meter, special traffic can be custom-made;
2, range than: standard 10:1 special type systematically;
3, precision: standard 1.Special type 1 level 5.Level 0;
4, pressure rating: standard: DN15-1.6 MPa (4.0 MPa DN80 - DN200;
5, the pressure loss: 7 kpa to 70 kpa;
6, medium temperature: standard: - 80 ℃ to + 200 ℃ : PTFE: 0 ℃ to 85 ℃;
7, high temperature type: zui high up to 400 ℃;
8, environment temperature, liquid crystal type - 30 ℃ to + 85 ℃;A pointer type to 40 ℃ to + 120 ℃;
9, the connection form: the standard: DIN2501 standard flange;Special type specified by the user of any standard flange or thread.
10, cable interface: M20 * 1.5;
11, power supply: 24 VDC two wire standard 4-20 ma (10.8 VDC - 36 VDC);
12, ac type: 85-265 vac 50 hz;
13, battery type: 3.6 v 4 ah nimh batteries;
14 and alarm output: ceiling or instantaneous flow alarm limits;
15 and standard: open collector output (100 ma zui big 30 VDC internal impedance euro 100);
16, special type: relay output (contact capacity zui big 5 a 250 vac);
17, accumulation of pulse output: pulse output, zui small interval 50 milliseconds;
18, liquid crystal display: instantaneous flow display numerical range: 0-50000;
19, the cumulative flow display numerical range: 0-.
20, protection grade: IP65;
21, explosion-proof marks: this Ann type ia Ⅱ CT6 flameproof d Ⅱ CT6.
Six, product maintenance:
1, in the long-term use process, the pipe will inevitably have a ferromagnetic impurity adsorption on the float, it would float jammed or affect measurement accuracy, need to clean them often float inside the sensor;If the installation of magnetic filter, also want to make regular cleaning.
2, instrument indicator is equipped with electronic components, instrumentation connection or remove the shell and the screw to tighten, must ensure that shell sealing, to prevent impurities, or other material into the water, but also ensure the reliable earthing of the instrument housing.
3, meters installed, in * times when using, should pay attention to:
Open valve to avoid pressure impact spacing device to float against, causes the damage of instrument, must open the valve slowly!
Measuring gas meter is equipped air damper, zui to large extent reduce the oscillation of the float;In order to ensure the stability of float, and can be installed in the export of instrument a throttle valve.
4, for remote transmission type instrument, first of all to ensure the instrument connection right after, can live;For the dangerous situation, must choose explosion-proof type, use and install according to the requirements of explosion-proof.

Seven, structure, classification:
1, high temperature structure type (G)
High temperature structural type (G) is used for medium temperature is too high or too low and need to measure the rate of flow of pipe heat preservation and heat insulation measures of medium measure.High temperature structure is increased the measuring tube and the distance between the indicator to increase heat dissipation, increasing the thickness of insulation material, ensure the indicator work in allow ambient temperature range.Type selection for the "G".
G type metal pipe flow meter can measure the temperature - 80 ℃ to + 300 ℃ medium flow.
2, the structure of the device with damper (Z)
Damper is structured for flow meter inlet flow (pressure) unstable when the medium flow measurement, especially for the measurement of the gas.
3, the structure of the clamp cover model (T)
Clip model structure used for heating or cooling, such as the high viscosity and crystallization medium flow measurement.In the jacketed by heating or cooling medium, make the low boiling point and low solidifying point fluid evaporation and crystallization.
Import and export of heating medium connection, the standard to use HG20594-97 DN15 PN1.6 flange, other connection flange specification can be indicated with factories, jacketed level of pressure is 1.6 MPa.
4, high pressure type structure (Y)
High pressure type structure used for pressure is greater than the standard level of measured medium flow measurement.High pressure type structure as shown in the figure below.The recent series of FFM64 zui high pressure can reach 32 mpa.Additional high pressure type flowmeter can provide built-in magnetic filter, the installation height is 350 mm.FA, FB and FC zui pressure to 10 mpa.
Eight, when installation should follow the following steps:
1, before installation to process piping, should remove all installed and check if there is any transportation damage;
2, to prevent it in transit, are installed in the indicator pointer rubber bands, before connection should be put it gently remove indicator left open, not a pointer position change;
3, open the indicator right cover, cable through the cable device are introduced according to the rotation Angle transducer wiring diagram wiring, screw the nut, the cable is fixed, then tighten the cover around the fastening screw, makes the indicator waterproof dustproof;
4, instrument of the upstream and downstream piping should be the same as the instrument of caliber, connecting flange or thread should be with the instrument flange and match, the gauge length of straight pipe upstream should guarantee is 5 times of nominal diameter, h2 downstream straight pipe length of not less than 250 mm;
5, because the instrument of measuring mechanism USES a magnetic transmission, so in order to guarantee the performance of the flow meter, sensor installation where at least 100 mm, do not allow the existence of ferromagnetic material;
6, instrument before installation, process piping should be purging, are attached to the instrument to prevent retention of ferromagnetic material in the pipeline, affect the performance of the instrument, even damage the instrument. If unavoidable, should be installed at the entrance of instrument magnetic filter;
7, the measuring gas meter, is under particular pressure calibration, if the export of gas in the instrument direct emissions to the atmosphere, will have the pressure drop in the float, and cause data distortion.If this is the working condition, a valve should be installed at the export of instrument, so as to to set the required flow rate value, when float on maintaining calibration pressure, gas puff in the valve;
8, instrument installation forms can be divided into vertical and horizontal installation, if it is a vertical installation form, should guarantee the instrument of straight degree is better than that of 1%;If it is horizontal form should guarantee the levelness of the instrument is superior to 1%;
9, installed in the pipeline instruments should not be the role of stress, the export of instrument and entry should be the appropriate pipe supports, can make the instrument in zui small stress state;
10, the product that is associated with computer operation, calibration, as well as should be carried out in a safe place.

Nine, troubleshooting methods:
1, check alarm value set size in the SU.
2 d values cannot too big, check the deviation.
The logical function, FUN, whether it is right.HA - A said cap is logical.LA -a said the lower limit is logic
4, circuit board fault, replace the circuit board.
5, if the LCD bar code instructions correct output without action, can check whether the external power supply and external power of the cathode is connected to the instrument power supply of the cathode.
If metal pipe flow meter in use dithering, could be determined according to the extent of jitter is what range of jitter.Jitter is divided into slightly shaking, moderate jitter and violent shaking.
1, the slight shaking: generally caused by fluctuations in medium.Can be used to increase the damping ways to overcome.
2, moderate jitter: generally caused by medium flow state.Is often caused by unstable operating pressure of medium for gas.Can use voltage or current regulator devices to overcome or increase the instrument air damping.
3, intense shaking, mainly due to the medium pulse, pressure instability or users are given gas pressure, temperature and flow of the operating state of inconsistent with the actual state of instrument, have bigger difference meter range.

Ten, notable matters of installation:
For normal work of the flowmeter and can achieve a certain accuracy of measurement, the installation flow timing should pay attention to the following:
1, must be installed vertically on the no vibration of the pipeline.Fluid flows through the flowmeter from bottom to top, and vertical degree is better than 2 °, horizontal when the horizontal Angle is better than 2 °;
2, for the convenience of maintenance and replacement meter, measuring pipeline cleaning, installed on the process pipeline flow meter shall be equipped with the bypass pipe and the bypass valve;
3 should have at least 5 times the pipe diameter, the entrance length of straight pipe, the export shall be 250 mm straight pipe;
4, if the medium containing ferromagnetic material, magnetic filters should be installed;If the medium containing solid impurities, consideration should be given to the valve and straight pipe between the filter;
5, when used for gas measurement, should guarantee the pipeline pressure is not less than five times the pressure losses of flow meter to float a stable work;
6, in order to avoid deformation caused by pipe flowmeter, process pipeline flange must be flange with meter coaxial and parallel to each other, pipe supports in order to avoid pipeline vibration and reduce the axial load meter, control valve should be installed downstream of the flow meter in measurement system:
7, measuring gas, if direct discharge atmospheric gas flowmeter in exports, the valve should be installed in the export of instrument, otherwise it will be in the float produces pressure drop and cause data distortion.
8, the installation of PTFE lining instrument, the asymmetry of flange nut don't twist too tight, lest cause PTEF lining deformation;
9, with a liquid crystal display instrument, avoid direct sunlight displays, so as not to reduce the service life of the liquid crystal;Instrument with lithium batteries, avoid direct sunlight, high temperature (65 ℃) or higher environment so as to avoid reducing the capacity and life of lithium-ion batteries.

Eleven, measuring parameter list:

Twelve, selection of coding:

13, design selection and order items:

1, according to the measurement of fluid is a gas or liquid, correct choose ZW - LZ series metal tube flowmeter.

2, be no corrosive choose normal flow corrosive choose corrosion type.

3, when placing order, please indicate the name of the measured medium, flow rate, pipe size and working pressure, temperature, density, viscosity, and so on and so forth.According to density of scale revised by the user, making special flow scale.

4, according to the measuring range of the measurement of body, applications, and choose the right type of specification varieties.If you have any special requirement of the flowmeter, company or calls, please contact the sales department.

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.