• File Name：Type Selection Instructions for Horizontally Installed Metal Tube Rotor Flowmeter
• Add Time：2019-04-12 10:30:19
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Productoverview:
ZW-LZR series horizontal metal tube rotameter has the advantages of simple structure, reliable work, high accuracy, wide application range.Compared with glass rotor flowmeter can resist high pressure.LZ series flowmeter has the local indication, limit switch, electric remote alarm, corrosion resistance, damping and explosion-proof type jacket, etc..Some parts are made of 1Cr18Ni9Ti stainless steel meter testing materials, special occasions can also be composed of 0Cr18Ni12Mo2Ti or F46 corrosion resistant materials.In addition to the flowmeter special specifications, the height was 250 mm.Connecting flange with GB/T9119.8 - 10 standard, also can be customized according to the special requirements of users.
Second, the structure and principle of measurement:
1, structure:
ZW-LZR series horizontal metal tube rotameter is mainly composed of:
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:
The installation of ZW-LZR series horizontal 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 product structure:
1, with all metal structure, common type, high temperature, high pressure, damping type type type.
2, according to the customer the pipe, the measuring tube structure can be divided into: in the cross, lower upper and lower transverse into cross, right into the left, the left into the right.
3, this series of metal tube rotameter consists of 2 parts: the measuring tube and indicator.The measuring tube comprises a conical tube or plate, guide, stopper, float and other components, including magnetic indicator servo system, a pointer, a dial, lines and other components.
Fifth, 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.
Six, technical parameters:
Measuring range: water (20 C), 2.5-150000L/h, air (20 DEG C, 0.1013MPa 0.07-4000Nm3/h);
Range: 10:1;
Measurement accuracy: 1.5/2.5;
Working pressure: 6.4MPa;
Working temperature: -40 to 350 DEG C (fluorine plastic lined -10 to 80 DEG C);
Ambient temperature: -20 to 80 DEG c;
Medium viscosity: DN15 = DN25, DN150 = ~;
Tube material: 1Cr18Ni9Ti, 316L, PTEF lining;
Installation: flange, or as required;
The basic error: 1.5%;
Output signal: 4 ~ 20mA;
Load impedance: 350 ohms;
Power supply: 24VDC;
Electrical connection: M20 * 1.5;
Explosion proof mark: ExibIICT4.
Seven, structure classification:
1, the high temperature structure (G type)
High temperature structure type (G type) is used for medium temperature is too high or too low and the need to take measures on the insulation of the measuring tube medium flow measurement.The high temperature structure is increased and the distance between the measuring tube indicator to increase heat dissipation and increase the insulation thickness, ensure the working environment temperature indicator in the allowable range.The selection of the "G" type.
Flow type G metal tube rotameter can measure the temperature of -80 DEG -+300 DEG medium.
The structure of 2, with a damper device (Z type)
Damper structure type flowmeter for entrance flow (pressure) medium flow measurement is unstable, especially for gas measurement.
3, jacket type structure (T type)
Jacket structure for heating or cooling of needs (such as high viscosity and flow measurement of the medium Yi Jiejing).In the jacket by heating or cooling medium, low boiling fluid and vaporization crystallization.
Import and export with thermal medium connection standard to use HG20594-97 DN15 PN1.6 flange, flange connection and other specifications may be marked with production plant, pressure rating jacket for 1.6MPa.
Jacket type flowmeter structure see FA standard flange type flowmeter and the size of map.
4, high pressure type structure (Y type)
High pressure type structure for media pressure is greater than the standard pressure level measurement.High pressure type structure as shown below.At present, the maximum pressure can reach 32MPa FFM64 series.In addition high pressure type flowmeter can provide built-in magnetic filter type, installation height is 350mm.FA, FB and FC type maximum pressure of 10MPa.
Eighth, the installation should follow the following steps:
1, before installation 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;
The upstream and downstream pipeline 4, instrument and 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 ensure that the instrument is 5 times the nominal diameter, 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, products and computer related to calibration and other operations, must be in a safe place.
The installation notes:
1 instrument, arrived at the scene, before installing the pipeline to remove all packing and unpacking, should carefully check whether the instrument for transport damage.
2, the instrument before installation, the pipeline should be blowing clean, prevent pipeline have ferromagnetic impurities attached to the instrument on a float, affect the normal measuring instruments, will cause serious damage to the instrument.If cannot avoid, should be installed in the entrance of the magnetic filter instrument.
3, because of the measuring mechanism of instrument by using magnetic transmission and magnetic signal processor for normal use and performance guarantee instrument, installation of a range of at least 500mm are not allowed in the presence of ferromagnetic materials, strong magnetic field and strong electromagnetic field.
4, installed in the pipeline in the instrument, should not be subject to stresses, instrument entrances should be reasonable to support, so that the instrument is the minimum stress in the process pipeline.
5, instrument installation is divided into horizontal and vertical installation installation, vertical installation of the instrument, instrument should ensure the verticality, tilt deviation is not greater than 3 degrees; the level of instrument installation, should guarantee the instrument level straightness, angle deviation is not greater than 3 degrees.
6, the instrument at the time of installation, the upstream and downstream pipeline diameter and the instrument should be the same caliber, the flange should be matched with each other; in order to ensure the accuracy and stability of the instrument, the instrument upstream straight pipe length is 5 times the nominal diameter of the instrument, the minimum length of 250mm downstream straight pipe.
7, the measurement of gas meter, gas meter if discharge directly to the atmosphere, even damage the instrument will cause distortion meter data.In this condition, the throttle valve should be installed at the exit of the instrument.
8, install the P T F E lining instrument, to be especially careful, at low temperatures, P T F E will deform under the action of pressure, so do not tighten the installation.
9, with a liquid crystal display instrument, to avoid direct sunlight, so as not to reduce the service life of the liquid crystal; with lithium battery powered instruments, to avoid direct sunlight, high temperature (65 DEG C) to reduce the capacity and lifetime of lithium battery.
Ten, 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, the instrument indicator 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.

Table eleven, technical parameters:

Twelve, selection table: