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• File Name：Type Selection Instructions for Liquid Crystal Metal Tube Rotor Flowmeter
• Add Time：2019-04-12 10:30:26
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Productoverview:
ZW-LZ Series LCD type 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-LZ Series LCD type 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-LZ Series LCD type metal tube rotameter is reliable, low maintenance, long service life; widely used in chemical industry, power generation, food, water treatment etc..The complex and harsh environmental conditions, the flow measurement process and various medium conditions in.
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, 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.
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.
Troubleshooting eight 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.
Nine, installation requirements.
Remove the filler, 1 meter box after check, the meter should be installed vertically in the pipeline without vibration, such as to the level of the installation, the order should be additional instructions.The angle between the line and the plumb line flowmeter center should not exceed 5 degrees.
In 2, the newly installed pipeline flow meter should be installed before the new pipeline clean metal pipe, if the measured medium containing impurity particles or bubbles, you should install filtering device or exhaust in flowmeter installation, the fluid must be flowing from down to up, if the fluid flow from top to bottom, then the flowmeter can not work.If the measured medium is pulsating flow, it should be appropriate to the size of the buffer device is arranged in the downstream, such as surge tank to eliminate pulsation.
3, in order to check the meter zero and disassembly and maintenance and debugging, should stop valve and bypass valve installed in the upstream and downstream flow meter.
4, an instrument according to the provisions after installation, should close the flow meter on the downstream shut-off valve, check again with the two meter instrument wiring, error free, open the two meter power supply is the instantaneous flow rate should be zero.For normal use, you should first open the upstream valve is fully open, with a metal tube flowmeter downstream from the valve slowly adjust the flow, instantaneous flow should change.Stop working when they should close the valve, then close the upstream downstream of the valve.

Table ten parameters, flow control:

Eleven, selection table: