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• File Name：Type Selection Instructions for Explosion-proof Metal Tube Rotor Flowmeter
• Add Time：2019-04-12 10:30:15
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Productoverview:
ZW-LZ series explosion-proof metal tube rotameter using magnetic sensor, magnetic field change detection angle without contact with the international advanced MCU micro processing system, can realize the liquid crystal indicator, and cumulative output distance (4 20mA), HART protocol, the output pulse output, alarm output function, the intelligent signal transmitter with high precision and reliability, and can completely replace the imported same type instrument.According to the process requirements of the vertical installation under the upper and upper lower side into the side and the bottom side, threaded connections, clamp connections, horizontal installation installation optional.
Second, the structure and principle of measurement:
ZW-LZ series explosion-proof metal tube rotameter consists of two parts:
The sensor - measuring tube and float;
Signal transmitter - indicator;
Touch sensor with liquid material: stainless steel, Hastelloy, titanium, stainless steel PTFE; users in the selection, you can choose different combination of indicator, to achieve different measurement requirements, see type indicator system.
Flow measurement is changed by the transmitter indicator in the magnetic coupling force to complete the feelings float.When the measured medium flows through the measuring tube, float by gravity, buoyancy and flow velocity of the float force to achieve dynamic balance, which is relatively static in a position ring area, fluid velocity changes in the position with the float and cone tube, the float position corresponds to the corresponding flow.
Third, widely used:
ZW-LZ series explosion-proof metal tube rotameter applicable to all industries complex, harsh environment, flow measurement and process control of small flow, low flow rate, a variety of harsh medium conditions.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:
Convenient 1, modular design, maintenance, maintenance of normal use;
2, intelligent with power-off protection, data backup and recovery function;
3, single axis, non-contact magnetic coupling structure model, the signal transmission is more stable;
4, all metal structure, seismic, pressure resistance, temperature resistance, corrosion;
5, double row, large screen liquid crystal display instantaneous and cumulative flow, with backlight;
6, HART communication protocol.
Five, technical parameters:
Measuring range: water (20 C) 6~200000 l/h; air (0.1MPa 20 C) 0.03 ~ 4000 m3/h;
Range: 10:1;
The accuracy level: 1.5 (out of 1);
Working pressure: DN15 ~ DN50 PN4.0MPa (special 32MPa);
DN80 ~ DN200 PN1.6MPa (special 25MPa);
The medium temperature of - 40 DEG C to +120 DEG C (the electric remote type is less than or equal to 85 DEG C);
Medium viscosity: DN15 = 5mPa.s (H15.0 ~ H15.4);
30mPa.s (H15.5 ~ H15.9);
DN25: = 250mPa.s;
DN50 ~ DN150: = 300mPa.s;
Liquid crystal display: instantaneous flow rate: 0~50000;
Cumulative flow rate: 0 ~ 99999999;
Output: standard two-wire signal: 4 ~ 20mA;
Pulse signal: minimum interval 50ms;
Alarm: alarm relay contact capacity, 1A-30VDC;
0.5A-125VDC or 0.25A-250VAC;
Power supply: Standard Type: 24VDC (10.8VDC ~ 36VDC);
AC: 220VAC (85VAC ~ 265VAC);
Battery type: 3.6-5.2AH lithium battery;
Connection: thread connection type: DIN11851 or the user specified;
Electrical connection: M20 * 1.5, PG11, 1/2 NPT;
Overall height: Standard Type: 250mm (vertical);
Protection grade: IP65;
Explosion proof mark: intrinsically safe: ExiaIICT3 ~ 6; flameproof type: ExdIIBT4 ~ 6.

Six, the instrument 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 rotameter downstream valve from slowly adjust the flow, instantaneous flow should change.Stop working when they should close the valve, then close the upstream downstream of the valve.
Seven, 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.
Eight, installation notes:
In order to keep the normal work of the flow meter and can reach a certain accuracy, in the installation of the flow meter should pay attention to the following points:
1, must be installed vertically in the pipeline without vibration.The fluid flowing through the flow meter and the verticality of bottom-up, less than 2 degree, the level of the installation of horizontal angle less than 2 degree;
2, in order to facilitate the maintenance and replacement of flowmeter, measuring pipeline cleaning, rotameter installed in the pipeline should be installed on the bypass pipe and bypass valve;
Straight section 3, the entrance should be 5 times the diameter of the length of straight pipe should be 250mm, export;
4, if the medium containing magnetic material, magnetic filter should be installed; if containing solid impurities in the medium, should consider adding a filter between valve and pipe;
5, when used to measure the gas, should ensure that the pressure loss of pipeline pressure not less than 5 times of the flowmeter, in order to make the float stability;
6, in order to avoid the deformation caused by the flowmeter due to pipe, flange and flange coaxial process pipeline must flow and parallel to each other, to support the pipeline to avoid vibration and reduce flowmeter axial load, control valve in the measurement system should be installed in the downstream of the flowmeter:
7, measurement of gas, if the gas is directly discharged to the atmosphere in the meter is to be installed in the valve outlet, instrument export, otherwise it will float in the generated pressure drop caused by the distortion of the data.
8, install the PTFE lining instrument, flange nuts do not arbitrarily asymmetric overdone, so as not to cause PTEF lining deformation;
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 and high temperature environment (65 = C) so as not to reduce the capacity and lifetime of lithium battery.
9 and fault elimination method:
Set alarm 1, check the SU in size.
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.

Table ten parameters:

Eleven, selection table: