Model LC ultrasonic flowmeter is an instrument for measuring liquid flow in pipe based on the principle of "velocity difference method". It adopts advanced multi-pulse technology, digital signal processing technology and error correction technology to make flow meter more suitable for the environment of industrial field, and more convenient, economical and accurate measurement. The products can be widely used in petroleum, chemical industry, metallurgy, electric power, water supply and drainage and other fields.
There are three main types of ultrasonic flowmeter: wall-mounted ultrasonic flowmeter, hand-held ultrasonic flowmeter and portable ultrasonic flowmeter.
Measurement Principle
When the ultrasonic beam propagates in the liquid, the flow of the liquid will cause a slight change in the propagation time, and the change of the propagation time is proportional to the velocity of the liquid. The relationship is in accordance with the following expressions:
V=MD/sin2θ×△T/TupTdown
Among them, θ is the angle between the sound beam and the direction of liquid flow, M is the number of linear propagation of the sound beam in the liquid, D is the inner diameter of the pipeline, Tup is the propagation time of the sound beam in the positive direction, and Tdown is the propagation time of the sound beam in the reverse direction, ΔT=Tup –Tdown.
The velocity of sound in stationary fluid be C, the velocity of fluid flow be U, and the propagation distance be L. When the direction of sound wave is the same as that of fluid flow (i.e. the direction of downstream flow), the propagation velocity is C+U. Conversely, the propagation speed is C-U Two groups of ultrasonic generators and receivers (T1, R1) and (T2, R2) were placed at two locations with L distance from each other. When T1 emits ultrasound along the direction, T2 emits ultrasound in the opposite direction. The time required for ultrasound to reach receivers R1 and R2 is T1 and t2, respectively, t1=L/(c+u) t2=L/(c-u).
Because the velocity of fluid in industrial pipeline is much smaller than that of sound, i.e. C > u, the time difference between them is t=t2-t1=2Lu/cc. It can be seen that when the velocity C of sound wave in fluid is known, the velocity u can be calculated by measuring the time difference t, and then the flow Q can be obtained. The method of flow measurement based on this principle is called time difference method. In addition, phase difference method and frequency difference method can also be used.
The ultrasonic flowmeter is composed of three parts: ultrasonic transducer, electronic circuit, flow display and accumulation system. The ultrasonic transmitting transducer converts electric energy into ultrasonic energy, and transmits it to the fluid under test. The ultrasonic signal received by the receiver is amplified by electronic circuit and converted into an electrical signal representing the flow for display and integration. In this way, the flow detection and display are realized.
Features
Non-contact measurement, no pressure loss.
No mechanical transmission parts, maintenance-free, long service life.
Suitable for flow measurement of any liquid, especially those with high viscosity, strong corrosion, non-conductivity and other properties. It can also measure the flow of gas.
For the flow measurement of large diameter pipeline, the cost will not be increased because of the increase of pipe diameter.
Wide range ratio, up to 5:1.
Product Classification
(1) Wall-mounted ultrasonic flowmeter (LCSG type)
High precision measurement: linearity is better than 0.5%, repeatability is better than 0.2%, and measurement accuracy is better than (+1%).
Wide measurement range: different types of sensors can be used to measure the flow of DN15-DN6000mm pipeline; support Chinese and English menus: different versions of flowmeters can support Chinese or English menus, convenient and fast.
High reliability: Using low voltage and multi-pulse transmitting circuit, the measurement accuracy, service life and reliability are greatly improved.
Strong anti-jamming ability: Double balanced signal differential transmitting and receiving circuit is used to effectively resist strong interference sources such as frequency converter, TV tower and high voltage line.
Powerful memory function: automatic memory of the accumulated flow of 512 days, 128 months and 10 years before, automatic memory of the first 64 times of power and power outage time and flow, automatic memory of the first 32 days of flowmeter working status is normal.
Basic Parameters:
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Optional Sensors |
Range |
Fluid Temp |
Accuracy |
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 Standard Clamping Type |
LCS-J1（S） |
DN15-100mm |
-30℃~90℃ |
Better than±1% |
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LCS-J2（M） |
DN50-1000mm |
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LCS-J3（L） |
DN300-6000mm |
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 Clamping Type For High Temp |
LCS-GJ1（S） |
DN15-100mm |
-30℃~160℃ |
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LCS-GJ2（L） |
DN50-1000mm |
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 Insertion Type |
LCS-C1（Standard insertion） |
DN80-6000mm |
-40℃~160℃ |
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LCS-C1（Lengthened insertion） |
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 Standard Pipe section type |
Standard Pipe section type |
DN50-1000mm |
-40℃~160℃ |
Better than ±0.5% |
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Power Supply |
Primary table DC8-36V, secondary table AC220V or DC24V |
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Input |
3-way 4-20 mA analog input, 2-way 3-wire PT100 resistance signal input |
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Output |
Isolation of RS232/RS485 output, 2 isolation of OCT output, 1 isolation of 4-20mA output (passive) |
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Communication Protocol |
MODBUS Protocol, METER-BUS Protocol, Fuji Extension Protocol, Simple Watermeter Protocol |
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(2) Handheld ultrasonic flowmeter (LCSC type)
High precision measurement: linearity is better than 0.5%, repeatability is better than 0.2%, and measurement accuracy is better than (±1%).
Small size and light weight;
Non-contact measurement: The flow measurement can be completed by adsorbing the magnetic ultrasonic flowmeter sensor to the outer wall of the pipeline.
The measurement range is large: the flow measurement of DN15-DN6000mm pipeline can be realized by selecting different types of sensors.
Charging power supply: built-in large capacity nickel-hydrogen rechargeable battery, can support flowmeter to work continuously for more than 12 hours;
Large screen LCD display: It can display instantaneous flow, cumulative flow, flow rate, working state and so on at the same time.
Built-in data recorder: It can store 2000 rows of recorded data.
Parameters
|
Item |
Performance Parameter |
|
Linearity |
0.5% |
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Repeatability |
0.2% |
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Accuracy |
Better than ±1%，Velocity of flow＞0.03m/s |
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Response Time |
0~999 S, User optional |
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Velocity range |
±32m/s |
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Pipe size |
15mm~6000mm |
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Unit of measurement |
Meters, feet, cubic meters, cubic feet, American gallons, British gallons, oil drums, American liquid drums, British liquid drums, American megagallons, user optional |
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Totalizer |
7-digit display, positive and negative Totalizer |
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Fluid Type |
Single homogeneous liquids capable of conducting ultrasound |
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Safety |
Locking of set values, changing data needs to be unlocked |
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Display |
4*16 English display |
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Communication Interface |
RS-232, Baud rate75-57600, Compatible with Fuji Ultrasound Flowmeter and other brand products |
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Sensor |
Standard M1 type, the other four optional |
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Sensor Cable |
5m*2, can be lengthened to 10m*2 |
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Power Supply |
Built-in NI-H battery, Each full charge can last 12 hours. Adapter:AC100V-240V |
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Data Recording |
Built-in data recorder can record 2000 data |
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Manual Totalizer |
7-digit display, which can be used for calibration by key-press operation |
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Housing Material |
ABS |
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Overall Dimension |
210*90*30mm |
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Weight |
500g(1.2lbs) Battery included |
(3) Portable ultrasonic flowmeter (LCSB type)
High precision measurement: linearity is better than 0.5%, repeatability is better than 0.2%, and measurement accuracy is better than (+1%).
Non-contact measurement: The flow measurement can be completed by adsorbing themagnetic ultrasonic flowmeter sensor to the outer wall of the pipeline.
Wide measurement range: The flow measurement of DN15-DN6000mm pipeline can be realized by selecting different types of sensors.
Charging power supply: built-in large capacity nickel-hydrogen rechargeable battery, which can support flowmeter to work continuously for more than 20 hours.
Support Chinese and English menu, convenient and fast.
Built-in printer can realize screen printing, and can also print the measurement results of up to 20 items in advance.
Built-in data recorder: It can upload the measured results of up to 20 items set in advance to the computer or network communication.
Parameters
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Item |
Performance, Parameters |
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Mainframe |
2*20 dot matrix backlight LCD, operating temperature (-20-60 ℃) |
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Printer Output 24-Column Character Miniature Thermal Printer |
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4*4+2 keyboard |
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Data is connected to RS-485 |
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Sensor |
TS-2, Applicable to pipe diameter:DN15~DN100mm，≤110℃ |
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TM-1, Applicable to pipe diameter:DN50~DN1000mm，≤110℃ |
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TL-1, Applicable to pipe diameter:DN30~DN6000mm，≤110℃ |
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Measuring medium |
Water, seawater, industrial sewage, acid and alkali liquids, various oils and other liquids that can transmit sound waves |
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Velocity range |
0~±30m/s |
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Accuracy |
Be better than ±1% |
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Power Supply |
Ni-MH batteries can work continuously for more than 20 hours，or 200VAC |
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Power Dissipation |
1.5W |
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Charge |
Intelligent charging mode, direct access to AC220V, automatic stop after charging, display green light |
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Weight |
2.5kg（Mainframe，N.W） |
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Note |
Equipped with one-piece high-strength protective box, it can be used in harsh environment in the field. |
Optional Transducers for Ultrasonic Flowmeters
