Thread link metal pipe flow meter

ZW - LZ seriesThread link metal pipe flow meter(also called threaded metal rotameter or threaded metal rotameter), can be used for complex, bad environment and various kinds of medium in the condition of the flow measurement and process control, suitable for measuring the liquid and gas.According to the instructions, applicable situation and the signal output form classification are: pointer type, electric remote transmission type, corrosion, high pressure, model, explosion-proof type.Support LCD, the scene show cumulative, instantaneous flow, and support the digital communications, field measurement parameters, electric remote transmission can be 0 ~ 10 ma, 4 ~ 20 ma standard analog signal, especially suitable for small diameter and low velocity medium flow measurement.

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, measuring principle:
ZW - LZ seriesLink thread 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 to form the rising 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.
Applications:
ZW - LZ seriesThread link metal pipe flow meterReliable operation, less maintenance, long service life;Widely used in: chemical industry, power generation, food, water treatment, etc.Complex, poor environmental conditions, and conditions in the process of the flow measurement of various media.
Four, 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.
Five, 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).
Six, transformation 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.
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.
Clip model see FA standard flowmeter flowmeter structure flange, dimension drawing.
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, maintenance instructions:
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, the points for attention during the installation:
1, before installing the flowmeter, first the stolen goods, within the pipeline welding by impurities such as blowing clean, if the solid impurities in the liquid, should be installed between the valve and the straight pipe corresponding filter.
2, shielding and grounding: in order to ensure the system emc performance, shielding and grounding is very important, especially the bus cable, to make the cable shielding as continuous as possible.
3, for safety, cable to be in accordance with the requirements for routine ground as soon as possible.
4, in dangerous places, to ensure that within the scope of the whole bus safety and danger all enough potential, such as matching, in this case, the multiple ground is very superior.
Ten, 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.
Metal pipe flow meter as long as the use method is correct, pay more attention to maintain at ordinary times, can ensure the normal use of it.

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.