Metal tube rotameter

One, the introduction:
LZ series of metal tube rotameter is a kind of variable area flowmeter.Under a main scale upward vertical cone tube, can float freely in the cone tube rises and falls, circular cross section of float is under the liquid force of gravity, as the change of flow, float up and down movement under the action of a velocity and buoyancy, float in a certain position of force and float gravity balance.Can achieve liquid crystal indicator, 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, etc.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:
LZ series of metal tube rotameter 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.
Three, classification and are widely used:
LZ series of metal tube 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;Reliable operation, small amount of 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.
The performance characteristics of four, metal tube rotameter:
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, using the latest foreign 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 metal tube rotameter main 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 MPa up to 10.0 MPa, DN80, DN100 PN1.6 MPa up to 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 (remote transmission type);
12, alarm output: upper or lower limit instantaneous flow alarm Relay output (contact capacity maximum 5 a - 250 vac) or open collector output (maximum 100 ma - 30 VDC internal impedance Ω 100);
13, pulse output: cumulative pulse output, and the minimum 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, metal tube rotameter installation requires the following points.
1, checked out after remove the filler of the flow meter, flow meter should be installed vertically on the no vibration of the pipeline, such as horizontal installation, should additional specifications when ordering.The center line of the flowmeter and the vertical Angle should not exceed 5 °.
2, new pipelines in tube flow meter before installing a new pipeline should be rinsed clean, if the medium to be measured particle impurities or bubbles, filters should be installed in the upstream flow meters or set the outlet, fluid when installation must flow from the bottom up, if the fluid flow from the top down, the meter doesn't work.If measured medium is pulsating flow, should be in the downstream set appropriate size buffer device, such as buffer tank to eliminate pulsation.
3, to facilitate the check meter zero and disassembling maintenance and debugging, the cut-off valve should be installed at upstream or downstream flow meter and the by-pass valve.
4, a meter installed by the regulation, should be closed either upstream or downstream flow meter cut-off valve, check instrument and secondary instrument connection again, and, after open secondary instrument power the instantaneous flow shall display to zero.To normal use, should be open upstream first after the valve is fully open, with metal pipe float flowmeter downstream regulator from small to large, slow flow rate adjustment, the instantaneous flow rate should be changed.Stop working, the upstream downstream of the valve, then close the regulator should be shut down.
Seven, flow range, and the pressure loss:

Eight, metal tube rotameter selection table:

Nine, design selection and ordering information:
1, according to the measurement of fluid is a gas or liquid, correct choose metal tube rotameter.
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.Our company 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 your letter, please contact the sales department.