High pressure type metal pipe flow meter

ZW - LZ seriesHigh pressure type metal pipe flow meterAdopted international advanced non-contact detecting changes in the Angle of magnetic field of magnetic sensors, and microprocessor system, which can realize LCD indication, cumulative, far transmission (4-20 ma), pulse output, upper and lower alarm output function, such as the type intelligent signal transmitter with and high precision and reliability, can replace imported the same type instrument, and has high cost performance, parameter calibration, power-fail protection features.Complex is widely used in various industries, under the bad environment, for small flow and low flow velocity, all kinds of harsh conditions of medium flow measurement and process control.
Second, the structure and working principle:
1, the structure:
Is mainly composed of three parts:
A, indicator (intelligent indicator, on-site indicator);
B, float;
C, tapered measuring room.
2, how it works:
ZW - LZ seriesType high pressure tube flow meter 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, acting 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.
Three, conversion indicator:
Converter is actually change the height of the cone tube float into the corresponding scale of volume flow.On the output signal of points: there is local display and remote transmission signal output:
1, on-site display type: by in situ indicator of follow-up magnetic steel and the float inside the magnetic coupling, and turning, at the same time, through dial, electric pointer indicates that traffic at this time.
Type 2, intelligent remote transmission, by intelligent indicator of follow-up magnetic steel and the float inside the magnetic coupling, and the rotation, sensing magnetic steel and pointer at the same time, through A magnetic sensor to magnetic field changes into electrical signal, after the A/D conversion, digital filtering, microprocessor processing, D/A output, LCD liquid crystal display (LCD), to show the size of the instantaneous flow and cumulative flow.
Applicable occasions:
ZW - LZ seriesHigh pressure type metal pipe flow meter has simple structure reliable operation, high accuracy, wide applicable scope.Compared with glass rotameter ability of high pressure.LZ series flow meter with on-site instruction, electric remote transmission, limit switch alarm, corrosion resistance, clamp type model, damping and varieties such as explosion-proof.Widely used in national defense, chemical industry, petroleum, metallurgy, electric power, environmental protection, pharmaceutical and light industry and other departments of the liquid, gas flow measurement and automatic control.
Five, the main features:
1, all metal structure design, strong, compact, high pressure, high temperature resistant, corrosion resistant, long service life;
2, short stroke, total 250 mm high, convenient installation;
3, mechanical pointer field indicates the instantaneous flow, LCD liquid crystal display instantaneous flow and cumulative flow;
4, intelligent indicator, adopts the new foreign zui signal collection and processing chip, modular design, without magnetic hysteresis;
5, data recovery, data backup, power-fail protection and fault self-diagnosis function;
6, HART type indicator, two wire 24 VDC power supply, the standard 4-20 ma current signal output stack HART protocol;
7, through the HART communication operator can adjust parameter configuration and on-site;
8, connected to the PC serial port, through the Windows program, the field of instrument calibration;
9, can be used in inflammable and explosive dangerous places;
10, vertical, horizontal, top bottom out, bottom in side out, side in side out, such as a variety of installations, flanged or threaded connections.
Six, the technical parameters:
1, the measuring range: water 2.5 ~ 100000 l/h (20 ℃)
2, range than: 10:1
3, precision grade: 1.0, 1.5, 2.5
4, work stress: DN15, DN25, (for PN4.0 MPazui 10.0 MPa, DN80, greatly DN100 for PN1.6 MPazui was 6.4 MPa
5, medium temperature: - 40 ℃ ~ 300 ℃
6, medium viscosity: DN15: eta < 5 mpa s. (F15.1 ~ F15.3)
Eta < 30 mpa s. (F15.4 ~ F15.8)
DN25: eta < 250 mpa, s
(~ 6: eta < 300 mpa, s
7, environment temperature, liquid crystal type: - 40 ℃ ~ 85 ℃
A pointer type: - 40 ℃ ~ 120 ℃
8, connection: flange (executive standard DIN2501 or made according to standard users with flange)
9, meter height: 250 mm
10, cable interface: M20 * 1.5
11, power supply: 24 VDC two wire 4 ~ 20 ma, or 85 ~ 265 vac 50/60 hz (far eastone type)
12, alarm output: the upper or lower limit instantaneous flow alarm relay output (contact capacity zui big 5 a - 250 vac) or open collector output (100 ma zui large internal impedance Ω 100-30 VDC).
13, pulse output: cumulative pulse output, zui small interval of every 10 seconds a pulse (ac type) or a pulse every 50 milliseconds.
14, liquid crystal display: double row liquid crystal display, display instantaneous flow and cumulative flow.
15, safety explosion-proof: Exia CT4 II.
16, measuring pipe material: stainless steel 316 (ordinary) or lined with ptfe (anti-corrosion type).
Seven, the structure of the instrument:
Flow meter is mainly composed of meter and indicator of two parts, according to the different way of connection can be divided into two kinds of vertical and horizontal installation.
Meter part
1, basic: liquid 0 cr19ni9 parts material, used in liquid measure;
2, anticorrosive type: lined with ptfe, suitable for corrosive medium measurement;
3, clip model: used for medium need insulation or cooling occasions, jacketed connecting flange DN15, PN1.6;
4, damping type: suitable for gas measurement.
Indicator of
1, the type field indicates: for field indicates the instantaneous flow;
Type 2, far eastone: output 4 ~ 20 ma dc signal, realize remote transmission function;
3, alarm, type: for special occasions need to report to the .
Eight, 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 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.
Nine, 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.

Ten, the matters needing attention:
1 meter installation must be before the welding slag, clean up debris within the pipeline.
2 the upright part must be installed perpendicular to the ground slope of the flowmeter shall not exceed 5 °. Otherwise it will affect measurement accuracy.
3 in order to ensure the measuring accuracy of flowmeter, should increase in the inlet side flowmeter in not less than 10 XDN straight pipe, outlet not less than 5 x DN straight pipe, when measuring the regulating valve must be installed on the downstream side of the meter.
If measured medium for big pulsating flow or two phase flow, should be installed upstream of the flow meter buffer to eliminate or weaken the pulsation, ensure the flow of the medium is single-phase stable, at the same time, the Suggestions of the flowmeter using damping type.
5 medium is dirty or containing magnetic particles, advice in magnetic flow meter installed upstream of the filter or filter.
6 meter installation should be able to properly support the pipeline vibration or reduce the axial load meter, it should increase the fixed flow meter.
7 in order to facilitate the maintenance of flowmeter, magnetic filter cleaning and user line of regular maintenance, it is recommended to use as shown follows the bypass pipe.
8 when the flow meter is used for gas, shall ensure that the pipe work pressure not less than five times the flow pressure loss, the flowmeter can stable normal action.
9 for electric remote transmission and take alarm limit switch meter before use, open the cover, according to the wiring diagram wiring correctly.
10 according to the instrument indicator of warning signs, prevent float vibration resistance movement in transport, before using the instrument.

Eleven, flow 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.