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Flowmeter

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Metal tube rotor flowmeter

I. Product Overview: LZ series metal tube rotor flowmeter is a variable area flow meter based on
Description

I. Product Overview:


LZ series metal tube rotor flowmeter is a variable area flow meter based on float position measurement. Adopt all-metal structure, Modular concept design, because of its small volume, small pressure loss, large range ratio (10:1), easy installation and maintenance, so widely used in various industries complex, harsh environment, small flow, low flow rate, all kinds of harsh media conditions flow measurement and process control.


Metal tube flowmeter series products, according to different user needs, different occasions, there are a variety of measurement forms for users to choose; According to the output form, there are local indication type, remote transmission out type, control alarm type; According to the classification of explosion-proof requirements, it can be divided into ordinary type, intrinsically safe type, isolation explosion-proof type three.


Using no contact detection magnetic field Angle changes of the magnetic sensor, and with Motorola microprocessing system, can achieve liquid crystal indication, accumulation, far transmission (4 ~ 20mA), pulse output, upper and lower limit alarm output and other functions, the type of intelligent signal transmitter has and high accuracy and reliability, can completely replace the import of the same type of instrument, It has the characteristics of high cost performance, multi-parameter calibration and power failure protection.


The design and production of the metal tube flowmeter also takes into account the requirements of the flow direction of the user process. There are vertical installation type, upward down installation type, side in side out installation type, bottom in side out installation type, threaded connection type, horizontal installation type and other installation options.


Ii. Working principle:


LZ series metal tube rotor flowmeter is measured medium bottom-up through the conical measuring tube, the upper and lower ends of the float produce differential pressure to form a rising force, when the rising force of the float is greater than the weight of the float immersed in the fluid, the float will rise, the annular gap area will increase, the fluid flow rate at the annular gap immediately decreases, the differential pressure at the upper and lower ends of the float decreases, and the rising force acting on the float is also reduced. The float is stable at a certain height until the lifting force equals the weight of the float immersed in the fluid. The float position corresponds to the size of the measured medium flow. The float has built-in magnetic steel, and the magnetic field changes with the float as it moves up and down with the medium.


a. For the local type, the rotating magnetic steel in the local indicator is coupled with the magnetic steel in the float to rotate and drive the pointer to indicate the flow rate at this time through the dial.


b, for the intelligent type, A solid-state magnetic sensor in the intelligent indicator will convert the changes of the magnetic field into electrical signals, through A/D transformation, microprocessor, D/A output, LCD liquid crystal display, to show the size of the flow and cumulative flow.


Three, type of flowmeter:


According to the direction of fluid inlet and outlet, the product is divided into 5 types: vertical type, horizontal type (also divided into horizontal T type, horizontal spring type), bottom in side out type, side in side out type, side in side out type, and each type has standard type, high temperature type, jacket type and so on.


Horizontal installation type flowmeter when the diameter is less than DN50 (including), choose T structure, when greater than DN50, choose spring structure.


Meter connection specifications: LZ series metal tube flowmeter standard type using GB/T9119-2000 flange standard, flange standard can be made according to customer demand; Thread connection and clamp connection can also be selected.


Magnetic filter:


If the medium contains ferromagnetic particles, a magnetic filter should be installed before the inlet of the flowmeter.


Four, application:


LZ series metal tube rotor flowmeter is a kind of variable area flow meter commonly used in industrial automation process control. It has the characteristics of small size, large detection range and easy to use. It can be used to measure the flow of liquid, gas and steam, especially suitable for low velocity small flow medium flow measurement. Widely used in petroleum, chemical, power generation, pharmaceutical, food, water treatment and other complex, harsh environmental conditions, and a variety of medium conditions flow measurement process.


Five, the main characteristics:


1, all metal structure design, strong, simple, high pressure resistance, high temperature resistance, anti-corrosion, long service life;


2, short stroke, total height 250mm, easy installation;


3, the mechanical pointer field indicates instantaneous flow, LCD liquid crystal display instantaneous flow, cumulative flow;


4, intelligent indicator, using foreign signal acquisition and processing chip, modular design, no magnetic lag;


5, with data recovery, data backup, power failure protection and error self-diagnosis functions;


6, HART indicator, two-wire 24VDC power supply, 4-20mA standard current signal output overlay HART protocol;


7. Parameter configuration and field adjustment can be carried out through HART communication manual operator;


8, Connect with PC serial port, through Windows program, realize on-site calibration of instrument;


9, can be used for flammable, explosive dangerous occasions;


10, vertical, horizontal, upper and lower out, bottom into side out, side into side out and other installation forms, flange or threaded connection.


Vi. Technical parameters:


1, measuring range: water 2.5 ~ 100000l/h (20℃);


2, range ratio: 10:1;


3, accuracy level: 1.0, 1.5, 2.5


4, working pressure: DN15, DN25, DN50 PN4.0MPazui 10.0MPa, DN80, DN100 PN1.6MPazui 6.4MPa;


5, medium temperature: -40℃ ~ 300℃;


6, medium viscosity: DN15: η<5mPa·s (F15.1 ~ F15.3); η<30mPa·s (F15.4 ~ F15.8);


DN25: η<250mPa·s


DN50 ~ DN150: η<300mPa·s;


7, the ambient temperature: liquid crystal type: -40℃ ~ 85℃; Pointer type: -40℃ ~ 120℃;


8, connection form: flange (implementation of the standard DIN2501 or customer provided flange standard manufacturing)


9, instrument height: 250mm


10. Cable interface: M20*1.5


11, power supply: 24VDC two-wire system 4 ~ 20mA or 85 ~ 265VAC 50/60Hz (remote transmission type)


12, alarm output: upper limit or lower limit instantaneous flow alarm relay output (contact capacity maximum 5A-250VAC) or collector open circuit output (z maximum 100mA-30VDC internal impedance 100Ω).


13, pulse output: cumulative pulse output, the minimum interval every 10 seconds a pulse (AC type) or every 50 milliseconds a pulse.


14, liquid crystal display: double row liquid crystal display, display instantaneous flow and cumulative flow.


15, the safety explosion-proof: Exia II CT4.


16, measuring pipe material: 316 stainless steel (ordinary type) or lined with polytetrafluoroethylene (anti-corrosion type).


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