Flameproof tube flow meter

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ZW - LZ seriesFlameproof tube flow meterMedium is suitable for small diameter and low flow velocity …

ZW - LZ seriesFlameproof tube flow meterMedium is suitable for small diameter and low flow velocity of the flow measurement;Reliable operation, small amount of maintenance, long service life;Straight pipe for the request is not high;A wide flow than 10:1.Double line large LCD display, optional site, according to the instantaneous/cumulative flow can take backlit uniaxial sensitive indicator;Non-contact magnetic coupling transmission;Metal pipe flow meter all-metal structure, suitable for high temperature, high pressure and strong corrosive medium;Can be used for flammable, explosive or dangerous situation;Optional two wire, batteries, communication power supply mode;Multiple parameter calibration function;With data recovery, data backup and power-fail protection function.

Second, the structure and working principle: 
1, the structure: 
ZW - LZ seriesFlameproof 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 seriesFlameproof tube flow meter is suitable for industry complex, bad environment, for small flow and low flow velocity, all kinds of harsh conditions of medium flow measurement and process control.Widely used in petroleum, chemical, power, pharmaceutical, food, water treatment, etc.Is complex, condition of bad environment and conditions in the process of the flow measurement of various media.
Four, the main features:
1, modular combination design, convenient maintenance, normal use free maintenance;
2, intelligent power lost protection, data backup and restore functions;
3, uniaxial, non-contact new magnetic coupling structure, more stable signal transmission;
4, all metal structure, seismic, pressure, heat resistance and corrosion;
5, double line, large screen LCD display instantaneous, cumulative flow, can take a backlight;
6, HART communication protocol.
Five, the technical parameters:
1, the measuring range: water (20 ℃) 6 ~ 200000 l/h;Air is 0.03 ~ 0.1 MPa (20 ℃) 4000 m3 / h.
2, quantity than: now;
3, precision grade: 1.5 (1.0), column type;
4, work stress: DN15 ~ (PN4.0 MPa (special type 32 MPa);DN80 ~ DN200 PN1.6 MPa (special type 25 MPa);
5, medium temperature: - 40 ℃ ~ + 120 ℃ (electric remote transmission type 85 ℃ or less);

6, medium viscosity: DN15: acuities were 5 mpa. S (H15.0 ~ H15.4);Acuities were 30 mpa. S (H15.5 ~ H15.9);

DN25: ≤250mPa.s；

DN50～DN150: ≤300mPa.s； 
7, liquid crystal display: instantaneous flow: 0 ~ 50000;
8, accumulated flow: 0 ~ 99999999;
10, lose out: standard signal: two wire 4 ~ 20 ma;
11, the pulse signal: zui small interval 50 ms;
12, alarm signal: relay alarm, contact capacity of 1 a - 30 VDC;0.5 A - 125 VDC or 0.25 A - 250 vac.
13, supply electricity: standard: 24 VDC (10.8 VDC ~ 36 VDC);
14, ac type: 220 vac (85 vac ~ 265 vac);
15, battery type: 3.6-5.2 AH lithium batteries;
16, connection mode: threaded connection type: DIN11851 or user specified;
17, electrical interface: M20 x 1.5, PG11, 1/2 "NPT;
18, the overall height: standard: 250 mm (vertical installation);
19, protection level: IP65;
20, explosion-proof marks: the Ann model: ExiaIICT3 ~ 6;Flameproof: ExdIIBT4 ~ 6.
Six, structure and classification of:
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".Can measure the temperature of 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.
Seven, transform 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.

Eight, 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.

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.