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• File Name：Type Selection Instructions for Micro Flow Metal Tube Rotor Flowmeter
• Add Time：2019-04-12 10:30:20
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Productoverview:
ZW-LZZW series of micro flow of metal tube rotameter has the characteristics of strong, stable, reliable and wide application range, can be used for measuring gas and liquid.All metal design to ensure its high pressure, high temperature stability, can withstand extreme environmental conditions.The position of the magnetic induction transmitted to an analog indicator displays the measured values.Without power.
Two, the structure and principle of measurement:
1, structure:
ZW-LZZW series of micro flow of metal tube rotameter is mainly composed of three parts:
A (Intelligent indicator, indicator, local indicator);
B, float;
C, a conical measuring chamber.
2, the principle of measurement:
On the lower end of the measured medium from the measuring tube through a conical float generating differential pressure form the upward force, when the float on the lift is greater than immersion float in the fluid weight, the float will rise, annulus area increases, the annulus fluid velocity decreased immediately, float on the lower pressure reduced, to float up with the decrease in stress, until the lift is equal to the weight of the float when immersed in a fluid, the float will stabilize at a certain height.The float position that corresponds to the size of the measured medium flow.A built-in magnet, the float with the medium moves up and down, with the movement of the float magnetic field changes.
A, for in situ, by rotary magnetic float and the local indicator in the inner magnetic coupling, rotate, and drives the pointer, through the dial indicates the size of the flow.
B, the intelligent, by a solid state magnetic sensor intelligent indicator in the magnetic field will change into electrical signal output by A/D transform, D/A microprocessor, LCD liquid crystal display to show the size and cumulative flow flow.
Three, widely used:
ZW-LZZW series of micro flow of metal tube rotameter is widely used in petroleum, chemical, power, pharmaceutical, food, water treatment, etc..The complex, harsh environmental conditions, the flow measurement process and various medium conditions in.
Fourth, the main features:
1, all metal structure, strong stability, suitable for high temperature and high pressure, strong corrosive medium.
2, using the isolation design, imported relay output, to ensure reliable operation.
3, in all sectors of the measurement of gas and liquid, the measuring part can be using different materials to adapt to various medium conditions.
4, the vertical and horizontal installation, more suitable for different occasions.
5, the magnetic coupling structure to ensure data transmission, more stable signal.
6, magnetic filter, with thermal insulation or jacket design.
7, the vertical and horizontal installation, more suitable for different occasions.
8, can be used in flammable and explosive occasions.
Five, technical parameters:
1. measuring range: water (20 C) (0.3 ~ 100) L/h; air (20 degrees 101325Pa) (1.2 ~ 3400) L/h;
2. range: 10:1;
3. accuracy level: 4
Maximum working pressure: 4. 2.5MPa (according to the need of increase)
5. medium temperature: -80 ~ +150 C
6. environment temperature: -25 ~ +65 C
7. connection: 1/4 "NPT thread or phi 6 (phi 8) sleeve connection / vertical connection according to the level of user requirements
8. limit alarm: 1~2 alarm switch (optional)
9. dimensions: overall size: 110mm; installation center distance: 90mm;
Sixth, product maintenance:
1, in the process of long-term use, the pipeline inevitably there will be ferromagnetic impurity adsorption on the float, it will float stuck or affect the measurement accuracy, from time to time to clean the sensor float; if the installation of magnetic filters should be cleaned regularly.
2, instrument indicator equipped with electronic components, instrument wiring or demolition of housing, to housing screws, must ensure sealing, prevent impurities, or other material into the water, and also to ensure reliable earthing of the meter casing.
3, instrument installation, on first use, should pay attention to:
When the valve is opened to avoid the formation of pressure shock makes the float slamming limiting device, causing damage to the instrument, slowly open the valve!
The measurement of gas meter is equipped with gas damper, to minimize the shock; to ensure the stability of the float, a throttle valve can be installed in the instrument export.
4, for the remote type instrument, we must first ensure that the instrument wiring correctly, keeps power; for dangerous situations, must choose the explosion-proof, and the installation and use of proof required by the.
Seven, the installation should follow the following steps:
1, before installing the instrument to process piping, should remove all installed and checked for any transport damage;
2, in order to prevent in transit, with a rubber band fixed pointer indicator, indicator should open the left cover it gently removed before connection, do not change the pointer position;
3, open the indicator of the right cover, cable through the cable introducing device, according to the wiring diagram wiring rotation transmitter, pressure screw nut, the cable is fixed, and then tighten the fastening screws around the cover, the indicator of waterproof and dustproof;
4, upstream and downstream piping and instrument instrument should be the same caliber, flange or threaded connection should be matched with the flange and screw instrument, instrument upstream straight pipe length should be 5 times the nominal diameter of the instrument, the downstream straight pipe length not less than H2 250mm;
5, the instrument measuring mechanism is magnetic transfer, so in order to ensure the performance of rotameter installed around the sensor, at least 100mm, the existence of ferromagnetic material is not allowed;
Before installation, 6 meter pipeline sweeping shall be carried out, to prevent the retention of ferromagnetic material in the pipeline is attached to the instrument, the instrument performance, or even damage the instrument. If unavoidable, should be installed at the entrance of the magnetic filter instrument;
7, the measurement of gas meter is calibrated in special pressure, if the gas meter in the outlet directly discharged into the atmosphere, will produce a pressure drop in the float, and lead to data distortion.If this is the working conditions, should install a valve in the instrument exports, so that the required flow value is set, when the float to maintain calibration pressure, gas expansion in valve;
The installation form 8, instrument installation for vertical and horizontal installation, if it is installed in a vertical straight form, should ensure that the instrument is better than 1%; if the level of installation form should ensure that the level of less than 1% meters;
9, installed in the pipeline in the instrument should not be subject to stresses, the instrument should be a proper entrance and exit pipe support, can make the instrument in the minimum stress state;
10, product and computer related to calibration and other operations, must be in a safe place.
Eight, installation notes:
In 1, before the first installation flowmeter in the pipeline, dirt, impurities such as welding blowing clean, if the liquid contained solid impurities, should the corresponding filter is installed between the valve and the straight pipe.
2, shielding and grounding system: in order to ensure ideal electromagnetic compatibility, shielding and grounding is very important, especially the bus cable, cable as far as possible to make continuous shielding.
3, the safety zone, according to the requirements of conventional cable grounding as much as possible.
4, in dangerous places, to ensure that the whole range of bus safe places and dangerous enough, all the potential, in this case, multiple ground is very superior.

Nine, choose the flow table:

Ten, selection table: