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• File Name：Type Selection Instructions for Threaded Metal Tube Rotor Flowmeter
• Add Time：2019-04-12 10:30:16
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Productoverview:
ZW-LZW series threaded metal tube rotameter for complex flow measurement and process control environment and various medium conditions, suitable for the measurement of liquid and gas.According to the instructions, the applicable situation and the signal output form classification: pointer type, electric remote type, corrosion type, pressure type, jacket type, explosion-proof type.Support for liquid crystal display, the scene shows the cumulative, instantaneous flow, digital communication, site measurement parameters, the electric remote can output 0 ~ 10mA, 4 ~ 20mA standard analog signal, especially suitable for small diameter and low flow velocity medium measurement.
Two, the structure and principle of measurement:
1, structure:
ZW-LZW series threaded 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.
Third, widely used:
ZW-LZW series screw metal tube rotameter strong, long service life, widely used in measurement and process control of petroleum, chemical, metallurgy, electric power, medicine, food, paper and other industries of liquid, gas and steam medium.
Fourth, the main features:
1, all metal structure design, strong, simple, high pressure resistance, high temperature resistance, corrosion resistance, long service life;
2, a short trip, the total height of 250mm, easy to install;
3, mechanical pointer instructions LCD liquid crystal display instantaneous flow, instantaneous flow, cumulative flow;
4, intelligent indicator, using the latest foreign signal processing chip, modular design, no hysteresis;
5, data recovery, data backup, power down protection and fault self diagnosis function;
6, HART type indicator, two-wire 24VDC power supply, 4-20mA standard current signal output of HART protocol stack;
7, through the HART communication manipulator configuration and parameters can be adjusted;
8, with the PC serial connection, through the Windows program, to achieve on-site calibration of the instrument;
9, can be used in flammable and explosive occasions;
10, vertical and horizontal, upper lower, bottom side, side into the side such as the installation of a variety of forms, flange or threaded connection.
Five, technical parameters:
1, water measuring range: 2.5 ~ 100000l/h (20 C)
2, range: 10:1
3, 1.0, 1.5, precision grade: 2.5
4, working pressure: DN15, DN25, DN50, PN4.0MPa, DN80, DN100 to 10.0MPa to PN1.6MPa to 6.4MPa
5, medium temperature: -40 to 300 DEG C
6, medium viscosity: DN15: <5mPa - s eta (F15.1 ~ F15.3)
<30mPa - S (F15.4 - F15.8)
DN25: <250mPa - s.
DN50: <300mPa - S - DN150.
7, the ambient temperature: LCD type: -40 to 85 DEG C
Pointer type: -40 to 120 DEG C
8, connection: flange (executive standard DIN2501 or as required by standard flange manufacturing)
9 meter height: 250mm
10, cable interface: M20*1.5
11, power supply: 24VDC two-wire 4 ~ 20mA or 85 ~ 265VAC 50/60Hz (remote type)
12, alarm output: alarm relay output lower or upper limit of instantaneous flow (contact capacity 5A-250VAC) or open collector output (maximum 100mA-30VDC internal impedance of 100 ohm).
13, the cumulative output pulse: pulse output, minimum interval of every 10 seconds a pulse (AC) or a pulse every 50 milliseconds.
14, double liquid crystal display: LCD display, display the instantaneous flow and cumulative flow.
15: Exia II CT4, explosion-proof.
16, the measuring tube material: 316 stainless steel (common type) or Teflon liner (corrosion type).
Six, conversion indicator:
The converter is actually the height conversion taper pipe float into the corresponding volume scale.From the output signal: local display and remote signal output type:
1, local display type: by in situ indicator in the follow-up magnetic float and the inner magnetic coupling, and rotate, and the electric pointer by dial indicating the flow
2, intelligent remote type, by the intelligent indicator in the follow-up magnetic float and the inner magnetic coupling, rotate, and drives the magnet and the sensing pointer through a magnetic sensor magnetic field change into electrical signals by A/D conversion, digital filter, D/ microprocessor, A output, LCD liquid crystal display, to show the instantaneous flow and cumulative flow rate.
Seven, the type of flow meter:
The metal pipe flowmeter will 5 types of products according to the fluid into the entrance and exit of direction: vertical type, horizontal type (including the level T, level of spring type), into the side of the bottom and side into the side, side in the type, and each type had type, standard type, high temperature jacket etc..
Horizontal mounting type flowmeter when the diameter is less than DN50 (inclusive), using T structure, when more than DN50, the spring structure.
Specifications: standard type flowmeter connected by GB/T9119-2000 standard flange, flange standard can be made according to customer demand; also can be used threaded connection, clamp connections.
Magnetic filter:
If there is a ferromagnetic particle medium, magnetic filter installed in the entrance before the flowmeter.
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, due to the use of 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.
Note nine, the installation of the:
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.
Troubleshooting ten fault:
1, check the alarm set value size SU.
2, check the deviation set D value can not be too large.
3, FUN function, logic function is correct.HA-A said the upper limit is logical.LA-A said the lower limit is.
4, circuit board failure, replace the board.
5, if the lcd barcode indicates the correct output, no action, the cathode can check the external power and external power supply is connected with the anode of instrument power supply.
If the metal tube rotameter jitter in use, according to the jitter amplitude to determine what kind of amplitude jitter.Divided into mild and moderate jitter jitter jitter and jitter.
1, a slight jitter due to fluctuations caused by the media.Can be used to increase the damping of the way to overcome.
2, moderate jitter caused by medium flow state: general.For general gas as the medium pressure instability caused by.The regulator or stabilizer to overcome or increase the damping of gas meter.
3, severe jitter: mainly due to medium gas pulsation, operation pressure instability or give users pressure, temperature, flow meter and the actual state does not have large differences over range instrument.
Metal tube rotameter as long as you use the correct method, usually pay more attention to maintenance, to ensure the normal use of it.

Table eleven, technical parameters:

Twelve, selection table:

- 80 -250 OC