The Portable Doppler Flow Meter uses the Doppler effect of sound waves propagating in the fluid. Hand-held design, suitable for handheld wading water flow measurement.

Features of Portable Doppler Flow Meter

• The flow rate range can reach 0.02-5m/s, and the resolution is 1mm/s.
• High response time. It takes a long time to get the flow rate and the measurement results are refreshed in real time.
• Flow measurement by velocity area method, suitable for full and non-full pipes. The water level relationship of the section can be set freely.
• The integrated pressure and water level sensor can directly measure the water depth and can be used in shallow water.
• Fluid mechanics shell design. Little impact on the flow state of the water body. Does not affect the measurement accuracy.
• Small and lightweight handheld terminal with a graphic display interface. It can display the flow rate, flow, water level, and water temperature in real time.
• 16MB internal storage space. It can store more than 100,000 data.
• Equipped with data receiving software. Used for data export and processing.
• Built-in multiple standard flow rate measurement methods and flow calculation methods.
• Rechargeable battery pack, continuous use for more than 12 hours.

Specifications of Portable Doppler Flow Meter

Fluid velocity	Range	20mm/s-5000mm/s
	measurement accuracy	±1% of measured flow rate
	Resolution	1mm/s
Liquid level	Range	0-5m
	measurement accuracy	±1cm
	Resolution	1mm
Flow rate	Range	0.001m3/s to 9999m3/s depends on the actual section
	measurement accuracy	±3%
	Resolution	0.0001m3/s
Other parameters	Power supply range	Built-in rechargeable battery, fully charged for more than 12 hours
	Collection cycle	5 meters, 10 meters optional
	Interface Type	USB
	Storage temperature	-20-80℃
	Operating temperature	0-60℃
	Protection level	IP68
	shell material	PVC

Extended reading: Make Ultrasonic Open Channel Flow Meter Work for You

Portable Doppler Flow Meter to measure open channel flow

Portable Doppler ultrasonic open channel flowmeter uses the principle of Doppler velocity area method to monitor flow. It is designed for flow velocity and flow measurement in open channels and partially filled pipes.

The principle of the Portable Doppler Flow Meter is to measure the fluid flow rate using the ultrasonic Doppler principle.

The liquid level is measured by pressure and ultrasonic sensors. The calculator can set multiple point coordinates to simulate the shape of the weir trough to obtain the cross-sectional area, so as to measure and monitor the flow.

Digital Water Flow Meters

See more

The principle of ultrasonic Doppler is adopted, that is, any liquid flowing in the pipeline has discontinuous disturbance.

These discontinuous disturbances can be suspended solid particles or bubbles, or interfaces caused by fluid disturbances.

This disturbance causes the reflected ultrasonic wave to produce a Doppler frequency shift Δf. The Doppler shift Δf is a linear function of the flow velocity. By measuring the Doppler frequency shift Δf, and according to the propagation speed of sound waves in the water. The flow velocity of the disturbance can be calculated, and then the water flow velocity can be obtained.

Only need to connect the flowmeter probe and the handheld controller when using the equipment.

Use the measuring rod to fix the flowmeter probe.

Put the flowmeter probe into the channel or water body to be measured.

The hand-held controller can display the corresponding flow rate information.

How much is a 2 inch water flow meter? Let’s find out.

Portable transit time flow meter

Sino-Inst, Manufacuturer for Portable Doppler Flow Meters. It can measure a single sound-conducting liquid medium. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Portable Doppler Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

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What is a Doppler flow meter? Doppler Flow Meter is a flow meter that uses the doppler effect principle to monitor the liquid flow rate.

Features of Doppler Flow Meter

• All functions in one design. Simultaneous measurement of average flow rate, water depth, and water temperature
• The velocity area method is used to measure the flow, and there is no head loss. There is no need to build a standard weir.
• The ultrasonic Doppler principle is used to measure the flow velocity. The measurement accuracy is high and the initial speed is low.
• No mechanical rotor structure. It has no effect on the water flow state, and the measurement is more accurate.
• Comes with a temperature sensor. It can be used to compensate for the effect of water temperature on the speed of sound.
• It can measure instantaneous flow and cumulative flow.
• Using frequency domain Doppler analysis algorithm. The data is stable and reliable, and the real-time performance is strong.
• Simple installation. No need for auxiliary engineering facilities

Specifications of Doppler Flow Meter

Fluid velocity	Range	20mm/s-5000mm/s
	measurement accuracy	±1% of measured flow rate
	Resolution	1mm/s
Liquid level	Range	0-5m
	measurement accuracy	±1cm
	Resolution	1mm
Flow rate	Range	0.001m3/s to 9999m3/s depends on the actual section
	measurement accuracy	±3%
	Resolution	0.0001m3/s
Other parameters	Power supply range	9-24V
	Collection cycle	Can be set
	Interface Type	RS485（Modbus）
	Storage temperature	-20-80℃
	Operating temperature	0-60℃
	Protection level	IP68
	shell material	PVC

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Doppler flow meter working principle

For flow velocity measurement, the first thing to explain is the Doppler shift. When there is relative motion between the wave source and the observer, the frequency received by the observer is different from the true frequency of the wave source. The difference between the frequency of the received signal and the frequency of the sound source is called the Doppler shift. Its size is determined by the relative speed between the two. This physical phenomenon is called the Doppler effect.

When measuring the flow velocity, the wave emitted by the probe encounters suspended matter, solid particles, vapor bubbles, and even unstable vortices and disturbances in the medium that follow the wave. Both will produce reflected waves that deviate from the transmit frequency, resulting in Doppler frequency changes. This effect is proportional to the velocity of movement of the reflector.

The receiving probe receives the reflected wave from each point. After complex signal processing, dynamic spectrum analysis and accuracy calculation. The flow velocity of the fluid in the pipe section can be obtained.

Flow rate calculation

The ultrasonic beam emitted from the Doppler velocity sensor (transducer) encounters particles or bubbles moving in the fluid. It is reflected back and received by the Doppler flow sensor (transducer). The Doppler frequency shift of the transmitted signal and the received signal is proportional to the fluid velocity.

Among them:
u is the channel flow rate,
f1 is the working frequency of the sensor,
δfd is the Doppler frequency difference.

Flow calculation

Real-time flow velocity and water level data collected by acoustic Doppler flowmeter.
The data acquisition and processing unit receives the flow rate and water level data. Calculate the instantaneous flow rate and record it as Qs;
Then calculate the accumulated flow rate and record it as Q; its flow rate can be calculated as follows:

Qs=AV

In the formula, A is the water area of the pipeline, and V is the average flow velocity of the section.

Q = QsT

In the formula, the instantaneous flow of Qs section, T is the accumulated time (unit h).

Read more about: Ultrasonic flow meters types & technical guide

Portable Doppler Flow Meter

The Portable Doppler Flow Meter uses the Doppler effect of sound waves propagating in the fluid. Hand-held design, suitable for handheld wading water flow measurement.

The Portable Doppler Flow Meter (Model: LSX-2) can obtain the velocity of the fluid by measuring the Doppler frequency shift of the sound waves scattered by the moving particles in the fluid. Combined with the built-in pressure water level gauge, the velocity area method can be used to measure the flow of the liquid. It is suitable for flow measurement of open channels, rivers, pipelines and difficult-to-build standard sections. It can work continuously for more than 12 hours on a single charge.

Transit time vs Doppler flow meter

There are two types of ultrasonic flowmeters, one is the time difference measurement method, and the other is the Doppler method. Many users often only know one of them.

Here, we make a simple comparison so that you can choose the correct model.

1.The measurement principle is different.

The main principle of the time difference method is that when the ultrasonic beam propagates in the liquid, the flow of the liquid will cause a small change in the propagation time. The change in its propagation time is proportional to the flow rate of the liquid.

At zero flow, the time required for the two sensors to transmit and receive sound waves is exactly the same. The only technology that can actually measure zero flow.

When the liquid is flowing, the transmission time of sound waves in the counter-current direction is longer than that in the downstream direction. The Doppler method uses the characteristic that the ultrasonic wave will be scattered when encountering tiny solid particles or bubbles in the propagation path.

2.The applicable medium is different.

The time difference ultrasonic flowmeter can only measure clean liquids. It will not work well when it contains more solid particles or bubbles.

The Doppler method uses the scattering characteristics of ultrasonic waves for measurement. Therefore, the Doppler method is suitable for measuring fluids containing solid particles or bubbles, but clean liquids cannot be measured.

3.The measurement accuracy is different.

The time difference method has higher measurement accuracy, and the Doppler method has lower measurement accuracy.

Since scattered particles or bubbles exist randomly, the sound transmission performance of the fluid is also different. If it is a fluid with poor sound transmission performance, the scattering is stronger in the low velocity area near the pipe wall.

However, the scattering of fluids with good sound transmission performance is dominant in the high velocity area, which makes the measurement accuracy of the Doppler method lower.

Although it adopts a structure in which the transmitting transducer and the receiving transducer are separated. In this way, only the scattering in the middle area of ​​the velocity profile can be received. However, the measurement accuracy is still lower compared with the time difference method.

4.The working conditions are different.

The time difference method is suitable for full pipe measurement.
The Doppler method is suitable for measuring the flow of full pipes, partial pipes, open channels, etc.

OMEGA Engineering has a good explanation of Doppler vs Transit Time. Let’s look together.

Video source: https://www.youtube.com/watch?v=NQWNYARWmB8

More Featured Ultrasonic Flowmeters

Sino-Inst, Manufacuturer for Ultrasonic Doppler Flow Meters. It can measure a single sound-conducting liquid medium. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Ultrasonic Doppler Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Parshall Flume (PVC material, stainless steel material) for Open Channel Flow Meter

When choosing the type of weir and trough for measuring water, it is necessary to consider the size of the flow in the channel, the flow pattern of the water in the channel, and whether it can form a free flow. According to the different large flow, we can choose different weir grooves.

• The large flow rate is less than 40 liters/sec. It is recommended to use a right-angled triangular weir;
• It is recommended to use Parshall tank for more than 40 liters/sec;
• The upstream channel is short, and the large flow rate is greater than 40 liters/sec. It is recommended to use a rectangular weir.

Conditions permit, a good choice of Parshall slot. The water level-flow relationship of the Parshall trough is calibrated by the laboratory, and the requirements for the upstream flow into the trough are relatively weak. The water level-flow relationship of the triangular weir and the rectangular weir is derived from theoretical calculations, and it is easy to cause additional errors due to ignoring some use conditions.

Use glass fiber reinforced plastic to make the measuring weir or trough. The size of the mouth of the triangular weir and the rectangular weir should be accurate, and the surface facing the water inlet should be smooth; the size of the throat part of the Parshall groove should be accurate, and the inner surface of the groove should be smooth.

Common installation methods and installation precautions of Parshall groove:

• Put the Parshall trough into the open channel. Keep the trough level. The centerline of the Parshall trough should coincide with the centerline of the channel, so that the water flow into the Parshall trough does not appear drift.
• After the Parshall trough is filled with water, the flow state of the water should flow freely. The submergence degree of the Parshall trough is less than the specified critical submergence degree.

Require:
Keep the downstream discharge of the Parshall trough unblocked. Do not accumulate water, if not unblocked. Keep the water level difference greater than or equal to 30MM.

The straight section before the Parshall trough has a distance buffer of 1 to 3 meters. The buffer channel should be level with the bottom of the trough. It is convenient for ultrasonic measurement.

It must be ensured that there is a water level difference downstream of the Parshall trough. The discharge is unobstructed and no water will accumulate.

Extended reading: Dam water level measurement

Open Channel Ultrasonic Flow Meter Working Principle

The open channel flowmeter is based on the specific shape of the Parshall metering groove/weir plate metering groove. It guarantees a certain liquid level and knows a certain flow rate. The Parshall groove/weir plate metering groove is selected as the specific flow channel. The measurement accuracy is high. Easy to install.

The sensor measures the height of the liquid level, which is processed by 89C52 series single-chip microcomputers to obtain the instantaneous flow and cumulative flow values.

The flow can be expressed by the following formula:
　　Q=KHn
　　Q: Instantaneous flow rate (t/h) K: Flow rate constant
　　H: height of liquid level n: nth power value

The instantaneous flow is processed by the cumulative accumulation to obtain the cumulative flow.

Extended reading: Radar Non Contact Water Level Sensor

Ultrasonic Open Channel Flow Meter Measures Sewage

Because the ultrasonic open channel flow meter uses open channel non-contact measurement. Therefore, the probe can be separated from the host. It can effectively solve the problems of probe corrosion and instrument accuracy, so it is widely used in irrigation and drainage and sewage measurement.

Read more about: Common River Water Level Measurement Methods

Note when installing:

• To ensure that the sewage flowing through the flow tank has no foreign matter. A filter must be installed not far upstream of the flow tank;
• To ensure that the sewage flowing through the flow tank is stable and without ripples. A still water well connected to the flow trough can be arranged on the side of the flow trough. The inner diameter of the well is ≥100mm. The bottom of the well should be 150mm below the lowest point of the trough. The width of the straight section of the trough ≥ 10 times the width of the water surface of the weir. The highest water level downstream is lower than the lowest water level of the weir;
• The emission surface of the sensor probe should be parallel to the liquid surface. The distance between the lower end of the sensor and the highest liquid level should be ≥0.7 m;
• There should be no strong light, electromagnetic field and other radiation sources around the sensor;
• There should be measures to prevent rain and snow above the ultrasonic sensor.

Note in use:

• Because the places where sewage ultrasonic sensors are installed are places with relatively poor environment. Therefore, the host of the instrument should be installed indoors. There should be a dedicated person to take care of it. Conduct regular inspections of lines and sensors;
• The meter should be checked regularly.

Read more about: Waste water measurement

More Featured Ultrasonic Flow Meter

Sino-Inst, Manufacturer for Open Channel Flow Meters. It can measure a single sound-conducting liquid medium. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Open Channel Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Transit Time Ultrasonic Flow Meter is a multi-channel flow meter. A velocity flow meter that measures the flow rate of the medium using the time difference method.

Features of Multipath Transit Time Ultrasonic Flow Meter

• High measurement accuracy:
  • The multi-channel ultrasonic flowmeter calculates the surface average velocity and flow rate by double integration of the velocity distribution and area distribution. It is not affected by the Reynolds number during the measurement, so high accuracy and high repeatability can be obtained.
• Two-way measurement: It can measure the forward and reverse flow of the measured fluid.
• Large measuring range: The measuring range of flow velocity can reach 0.03m/s～20m/s.
• Wide application range:
  • The nominal diameter of the measuring pipe can reach DN25mm～15000mm.
  • The measuring width of the open channel can reach 30 m.
  • The measuring width of the river can reach 150m.
• Good low flow rate:
  • The multi-channel ultrasonic flowmeter can obtain high accuracy in a more complicated state with low flow rate. The problem of inaccurate measurement in the low flow rate area is solved.
• Dry-type verification technology:
  • It can realize online verification, which solves the problem that large-diameter flow meters and flow meters in use cannot be verified in real flow. It also reduces the cost of verification.
• Continuous flow online installation and maintenance:
  • It can be installed and maintained online to avoid the loss caused by the current cut. No need to set up bypass pipelines, reducing construction and maintenance costs.
• Low pressure loss: no drive, protruding and other obstructive parts, no pressure loss.
• Short upstream and downstream straight pipe sections required: accuracy can be guaranteed when the upstream 5D and downstream 2D ​​(D is the pipe diameter) are met.
• Can display and transmit pressure signal:
  • Install a pressure sensor to measure fluid pressure, which can be displayed on the secondary meter and realize communication.
• With RTU function:
  • Can store positive and negative instantaneous flow, cumulative flow, flow rate, pressure, power failure records and other information.
  • You can download and store data on-site. It can also be remotely transmitted to the upper computer for control and management.

Extended Reading: Inline Ultrasonic Flow Meter

Specifications of Multipath Transit Time Ultrasonic Flow Meter

Number of channels	1	3		5
Nominal diameter (mm)	DN50～DN600	DN80～DN600		DN150～DN15000
Average flow velocity (m/s)	1.0～20	0.05～0.5	0.5～20	0.02～0.5	0.5～20
level of accuracy	0.5	1	0.5	0.5	0.25
Repeatability	0.3	0.3	0.2	0.15	0.1

Environment temperature:	-20℃～ + 60℃
Relative humidity of environment:	≤ 90%
Medium temperature:	-20℃～+ 80℃;-40℃～+ 150℃ (optional)
Media status:	The measured medium should be a uniform liquid that does not affect the propagation of ultrasonic waves.
Fluid pressure:	PN1.0, PN1.6, PN2.5, PN4.0 (other)
Power supply:	AC 110V/220V±10% (50/60Hz) DC 24V±10%
Meter power consumption:	18w
Measuring tube (one-time meter):	IP68
Controller (secondary meter):	IP65 (please equip an instrument box if placed outdoors)
Display parameters	Instantaneous flow, cumulative flow, flow rate, time, pressure (optional)
Analog signal:	4∼20mA 1. In the SOURCE active mode, the maximum load resistance is 500Ω, and the jumpers 2 and 3 on the bottom right of the main board are shorted; 2. In the case of LOOP passive mode, pins 1 and 2 are short-circuited, and an external DC24V power supply is required
Frequency output:	1kHz 10kHz (optional)
Police report:	High value, low value (NPN-TYPE 24VDC)
News:	RS232/RS485 (switching)
Store information:	Store 2400 sets of cumulative flow/instant flow, 100 sets of switch records/error information codes, more optional.

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Transit Time Ultrasonic Flow Meter Principle

The time difference method is actually based on the vector superposition of the ultrasonic propagation velocity and the liquid velocity. It can be simply compared to the process of ferrying on a river.
Although the speed of the ferry itself is the same when flowing downstream and upstream.

However, due to the influence of the current speed, the time required for the ferry to reach the opposite bank is less when the flow is downstream than when it is upstream. The greater the flow velocity, the faster the downstream speed, and the longer the time required for the upstream flow. The time difference between the forward and reverse flow is proportional to the flow velocity.

Transit time ultrasonic flow meter equation

The difference in the upstream and downstream measurements taken over the same path is used to calculate the flow through the pipe:

V = K • D/sin2θ • 1/(T₀ – t)² ΔT

Where:

V = Mean velocity of flowing fluid
K = Constant
D = Inner diameter of the pipe
θ = Incident angle of ultrasonic waves
T₀ = Zero flow transit time

ΔT = T₁ – T₂
T₁ = Transit time of waves from upstream transmitter to downstream receiver
T₂ = Transit time of waves from downstream transmitter to upstream transmitter
t = Transit time of waves through pipe wall and lining

The above equation shows that the flow velocity of the fluid is directly proportional to the difference in the upstream and downstream measurements.

The transit time ultrasonic flow meter has three possible transducer configurations: Z, V and W.

All are recognized as a single measuring path, whereas the ultrasonic beam follows a single path. In all three configurations, the output produced by the transducers is converted to a current, frequency or voltage signal. The preferred configuration is determined by factors such as:

• Pipe size
• Space available for mounting the transducers
• Condition of the internal walls of the pipe
• Type of lining
• The characteristics of the flowing liquid

In the “Z” configuration, the transducers are positioned on opposite sides of the pipe with one downstream from the other.

Usually, the distance downstream is approximately D/2, where D equals the diameter of the pipe. The optimum distance is calculated by a converter. This arrangement is only advisable under conditions where there is limited space, high turbidity, a mortar lining or a thick build-up of scale on the interior walls of the pipe. It should be avoided for installations on small pipes, where the accuracy of its measurements tends to degrade.

The “V” configuration is recommended for most installations. This arrangement places the two transducers on the same side of the pipe within approximately a diameter of the pipe from each other. A rail attachment clamps on the pipe and allows the transducers to be slid horizontally to position them the calculated distance apart.

A “W” configuration is most often used for installations on pipes with diameters of ½ inch to 1½ inches. In this arrangement, the ultrasonic signal rebounds from the wall three times; therefore, it must travel a greater distance. High turbidity liquids, and scale or deposit build-up on the interior of the pipe wall can diminish accuracy.

Extended reading: Ultrasonic flow detectors types

More Transit Time Ultrasonic Flow Meter

Sino-Inst, Manufacturer for Transit Time Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Transit Time Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Read more about: How does a residential water meter work?

water meter installation details

Installation and use of ultrasonic water meters and precautions:

1. The applicable model is determined according to the system flow rather than the system pipe diameter. The diameter and model of the heat meter should be determined according to the commonly used flow.
2. According to the design requirements of household measurement, a filter must be installed before the water inlet. The filter must be cleaned and maintained regularly.
3. It must be installed in a horizontal or vertical direction, and the direction of the arrow on the pulse meter (including the filter) must be consistent with the direction of the water flow in the pipeline. Do not allow the water to flow backwards to avoid impurities in the water from damaging the meter. When installed vertically, the water flow direction must be upward .
4. Before installation, the pipes must be cleaned.
5. There should be straight pipes of sufficient length at the inlet and outlet of the water meter. The length of the straight pipe at the front end of the inlet should not be less than 10 times the length of the pipe diameter. The length of the straight pipe at the front end of the outlet should not be less than 5 times the length of the pipe diameter:
6. The water meter calculator (display) shall not be immersed in water.
7. The water quality of the water supply should meet the relevant regulations.
8. The water meter is a measuring instrument, and the heat meter must be checked regularly in accordance with national standards, and the battery must be replaced during the check.
9. To avoid man-made damage to the metering system, a water meter box can be installed.
10. Without the permission of the company, no one is allowed to disassemble the maintenance watch without permission, otherwise the warranty service will be released by itself.

Read more about: Common River Water Level Measurement Methods

water meter life expectancy

Water meter is an instrument for measuring water flow. Most of them are cumulative flow measurement of water, generally divided into two types: volumetric water meter and speed water meter. Originated in the United Kingdom, the development of water meters has a history of nearly two hundred years.

The service life of the water meter shall not exceed 6 years (caliber of 15-25 mm), 4 years (caliber of > 25-50 mm), and shall be rotated upon expiration. In other words, a water meter with a diameter of 15 to 20 mm can be used for up to 6 years.

More high accuracy liquid flow meters

More Water Flow Measurement Solutions

Sino-Inst is Manufacturer of ultrasonic water meters. We supply more than 20 kinds of ultrasonic water meters. 90% of ultrasonic water meters are used in industrial agriculture. The rest are for civilian use.

Due to the measurement of different pipes, the price of ultrasonic water meters is also different. Available from USD 50.00 to USD 1500. So, if you need to purchase ultrasonic water meter. Please contact our sales engineer to confirm the price.

Ultrasonic water meters are mainly used for flow measurement of water. They are mainly used for metering and monitoring the flow of water media, such as domestic water, central air conditioning system water, equipment pipe network water, etc.

Ultrasonic water meters enable stable flow measurement . This greatly meets the measurement needs of many applications. Can be used from small to large tubes.

Sino-Inst’s Ultrasonic water meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a Ultrasonic water meters, level sensor, or other device, give us a call.

Ultrasonic Water Flow Meter is a new type of water meter designed for water resource monitoring. Using ultrasonic time difference measurement technology.

Features of Insertion Ultrasonic Water Flow Meter

• Small and compact all plastic, IP68 protection level
• High accuracy 100:1 turndown ratio
• Pipe body probe, not easy to scale
• Adaptive ultrasonic signal can measure water with impurities
• Single chip SOC digital time difference processing
• Multi-line with status display, touch key operation
• Optional built-in Lora or NB-iot function
• Dual interface RS485 and MBUS
• MODBUS, MBUS, CJ188 and other multiple communication protocols
• Can work with external power supply
• 10 years working life of built-in battery
• Reliable and low price suitable for mass application

How much is a 2 inch water flow meter? Let’s find out.

Specifications of Insertion Ultrasonic Water Flow Meter

Perfomance	Specification
Measurement Range Ratio	100 : 1
Working Pressure	＜1.6 MPa
Temperature	T30
Working Environment	-25°C~55°C，≤100%RH
Display Range	Multi-lines show 9-bit cumulative flow, 6-bit instantaneous flow, signal strength flow direction, error, communication status
Unit	m³, USG, Liter, cubic foot, Acre Feet
Operating Mode	Two capacitive touch keys support sliding operation.
Communication Interface	Physically independent RS485 and infrared interface. LORA/ NB-IOT, WIFI, USART are optional.
Output	2 way of OCT output is optional, can simulate dipulse output of mechanical water meter.
Communication Protocol	MBUS， MODBUS， ASCII， CJ188
Power Supply	3.6V 4Ah lithium battery (battery life>10 years). It will operate power save functions when there is no water and flow in pipe
Other	Data saving time after power failure: 10 years
Protection	IP68

Extended reading: What is Modbus Protocol?

Flow Rate:

Nominal Diameter （mm）	Flow Meter Dimensiom					Flange Dimension					Weight(Kg)
	L	H1	H2	W1	W2	Outside Diameter D	Diameter of Bolt Circle D1	Bore Diameter ×Quantity  φ×n	Ralsed Face
									Outside Diameter D2	Height f
DN50	50.8	52	91	58	58	102	125	16.5×2	102	2	0.7
DN65	50.8	60.5	97	63.5	63.5	120	145	16.5×2	120	2	0.7
DN80	50.8	70	132	68	68	135	160	16.5×2	135	2	0.9
DN100	50.8	80	140	79	79	158	180	16.5×2	158	2	1.0
DN125	50.8	95	145	94	94	188	210	16.5×2	188	2	1.2
DN150	50.78	107	157	106	106	212	240	20.5×2	212	2	1.4

Extended Reading: Inline Ultrasonic Flow Meter

Extended reading: Industrial VS Residential inline water flow meters

Ultrasonic Water Meter Working Principle

The ultrasonic water meter adopts the time difference method to measure the flow. That is to say, an ultrasonic transducer is installed in the upstream and downstream of the measurement channel (pipe section) for mutual transmission and reception of ultrasonic signals.

Because the ultrasonic signal is superimposed with the water flow signal. Make the sound waves travel at different speeds in the forward and reverse flow. Therefore, the ultrasonic signals emitted by different transducers have different running times in water. By measuring the difference in time, the flow rate of the fluid can be calculated. And then converted into flow, so as to achieve flow measurement.

There are two transducers on top of the flow tube. Transducer A transmits an ultrasonic signal (downstream) to transducer B. At the same time, the B transducer transmits an ultrasonic signal (countercurrent) to the A transducer. A certain time difference is formed in the transmission process of the ultrasonic signals in the upstream and downstream.

In the case of calibrated pipe diameter cross-sectional area and standard measuring pipe length. The flow rate of the meter is calculated by the calculation chip on the integrator.

Featured ultrasonic clamp-on water flow meter

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Sino-Inst, Manufacuturer for Insertion Ultrasonic Water Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Insertion Ultrasonic Water Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Inline Ultrasonic Flow Meter is a standard pipe section flow meter. The flow rate is measured by the principle of ultrasonic time difference.

Inline Ultrasonic Flow Meter Working Principle

Inline Ultrasonic Flow Meter is a meter that measures the flow of liquid in a round tube based on the principle of ” transit Time”. It adopts advanced multi-pulse technology, signal digital processing technology, and error correction technology. The flow meter can be more adapted to the environment of the industrial site, and the measurement is more convenient, economical, and accurate. The products have reached the advanced level at home and abroad and can be widely used in petroleum, chemical, metallurgy, electric power, water supply, and drainage fields.

Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because the flow channel of the instrument is not equipped with any obstructions, it is an unobstructed flowmeter. It is a type of flowmeter suitable for solving difficult problems in flow measurement. Especially in large-diameter flow measurement. The advantages. It is one of the rapidly developing types of flow meters.

Transit Time Ultrasonic Flow Meter adopts the measurement principle of the time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.

The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.

By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.

Notes:
V measure fluid velocity
M ultrasonic reflection times
D pipe diameter
θ The angle between the ultrasonic signal and the fluid
T up The time when the downstream sensor transmits the signal to the upstream
T down Time from upstream sensor to downstream
ΔT = T up – T down

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Pipe section In-line sensors

Pipe section sensor: The pipe section sensor is a measurement method in which the pipe section sensor is directly connected to the pipeline under test by using a flange or thread. This sensor solves the problem of man-made or measured pipelines during the installation of the external clamps and plug-in sensors. Errors caused by inaccurate parameters. It has the characteristics of high measurement accuracy, good stability, and maintenance-free.

Clamp-on ultrasonic flow meter

Insertion Ultrasonic Flow Meter

Read more about: Ultrasonic flow meters types & technical guide

Sino-Inst, Manufacturer for InLine Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN32—6000mm. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s InLine Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

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Insertion Type Ultrasonic Flow Meter Applications

In terms of the measurement medium, the ultrasonic flowmeter can measure both conductive liquids, such as water, and non-conductive liquids, such as desalted water and pure water. There are also sewage, mud, ore pulp, paper pulp, chemical fiber pulp, corn syrup, fruit juice, alcohol, drugs, blood plasma and many other special media. As long as it is a single uniform and stable ultrasonic transmission liquid, it can be measured.

There are 5 conditions to use Insertion Type Ultrasonic Flow Meter:

In the above cases, the use of Insertion Flow Meter can be considered.

insertion type ultrasonic flow meter installation

Large Pipe Flow Meters

The cost of monitoring the flow in a large diameter pipe is very high. Today, modified intrusive and clip-on flowmeter technology can be used to measure flow in large pipelines. Using Insertion flow meters, it is possible to monitor the flow in pipes up to 6000 mm in diameter.

Of course, except for ultrasonic flow meters. There are other flow meters suitable for liquid flow in large-diameter pipes.

When measuring the liquid flow of large-diameter pipes, the following factors should be considered when selecting a flow meter:

• The pressure loss should be as small as possible;
• Due to the low flow rate (to reduce operating costs), the inner wall of the pipeline is easy to deposit dirt and sludge;
• The measuring range of the flowmeter used should be particularly large to adapt to the disparity of browsing in different time periods;
• The protection level of the flowmeter should also meet the requirements of the environment.

Extended reading: Magnetic Large Dia. Pipe Flow Meter

What is insertion type flow meter?

The insertion flow meter can provide a low-cost alternative to full-caliber flow equipment. Full-caliber flow equipment will take up a lot of space and require a lot of installation work. And there are special difficulties in service or calibration.

Drill a hole of appropriate size in the pipe wall. And a method of fixing the insertion gauge is adopted. This can be a saddle clamp, a welded threaded short tube, or a mating flange.

Then insert the Insertion sensor into the pipe to the depth recommended by the manufacturer. If on-site calibration is possible, the depth can be adjusted to improve accuracy.

Once the meter is fixed, it will only measure the speed at this time. And the volume flow cannot be calculated before considering the pipe diameter and the nature of the medium. Usually in the electronic flow computer/display unit.

More Ultrasonic Flow Measurement Applications and Markets

If the insertion type of flowmeter is too troublesome to install. Then you can consider using a clamp-on ultrasonic flow meter. Simple and easy to use.

Sino-Inst, Manufacturer for Insertion Type Ultrasonic Flow Meter TUF2000. It can measure a single sound-conducting liquid medium of DN50 – 6000mm. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Insertion Type Ultrasonic Flow Meter TUF2000, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Clamp on Ultrasonic Flow Meter is a wall-mounted ultrasonic flow meter using TGA time difference technology. TGA is an algorithm for measuring process time with higher speed and accuracy.

Features of Clamp on Ultrasonic Flow Meter

Compared with other conventional flowmeters, the LRF-3000S ultrasonic flowmeter has the following characteristics in addition to the flexibility of on-site installation, high response speed and better measurement capability under low flow rates:

1. Use an independent high-performance FPGA chip with 400,000 gate arrays. The measurement rate can be greater than 300 times per second. Compared with other brands, it has a great improvement in the resistance to air bubbles in the measurement pipe diameter. It can withstand continuous bubbles for up to 5 seconds.
2. Increased signal strength. It has greater penetrating power to various scales, rust in the pipe and the inner lining of the pipe.
3. 4-line LED display. Easy to operate.
4. The sensor adopts our unique manufacturing process and matching technology. The zero point range can be controlled within 0.03m/s. The static time difference between each pair of sensors is less than 2 nanoseconds. This effectively guarantees the authenticity of the measured time difference.

Specifications of Clamp on Ultrasonic Flow Meter

Performance specification
Flow range	0 ~ ±12m /s (0~ 40ft /s)
Accuracy	1.0% of measured value
Repeatability	0.20%
Pipe Size	DN25~DN1200mm
Function Specification
Outputs	Analog output: 4~20mA, max load 750Ω.
	Pulse output: 0~10KHz
Power Supply	10 ~ 36VDC or 10~24VAC
Keypad	16 keys(4X4) touch keys
Display	240*128, 4-line LCD display
Temperature	Transmitter: -14℉~140℉(-20℃~60℃)
	Transducer:-40℉~176℉(-40℃~80℃,TT01  ,Standard)
	Transducer:-40℉~266℉(-40℃~130℃,TT03  ,High Temp)
Physical specification
Transmitter	PC+ABS, IP65
Transducer	Encapsulated design,IP68
	Double-shielded transducer cable
	Standard/maximum cable length:30ft/1000ft(9m/300m)
Packaging	20*22*23.5cm, 3.0kg

External clamp sensor:

1. The signal cable and sensor are manufactured in one piece without wiring;
2. Hidden tube tie design, more stable and beautiful after installation;
3. A pair of sensors can achieve DN25-DN1200mm measurement to meet the use of a larger range of pipe diameters;
4. Protection grade IP68, can work underwater without water ingress.

Clamp on Ultrasonic Flow Meter Working Principle

Clamp on Ultrasonic Flow Meter adopts the measurement principle of time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.

The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.

By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.

Notes:
V measure fluid velocity
M ultrasonic reflection times
D pipe diameter
θ The angle between the ultrasonic signal and the fluid
T up The time when the downstream sensor transmits the signal to the upstream
T down Time from upstream sensor to downstream
ΔT = T up – T down

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Clamp on water flow meter

Clamp on water flow meter means to measure the water flow rate by clamping the ultrasonic flowmeter sensor outside the pipe. The sensor is non-invasive. Of course, according to the actual requirements of the measurement, it can be fixed or portable.

So, why are we willing to use Clamp on ultrasonic flowmeter to measure the flow rate of water?

There are many types of flow meters for measuring water. Common ones are: V cone flowmeter, electromagnetic flowmeter, metal rotor flowmeter, vortex flowmeter, liquid turbine flowmeter, ultrasonic open channel flowmeter, ultrasonic flowmeter, etc.

There are many types of flow meters for measuring water. Common ones are: V cone flowmeter, electromagnetic flowmeter, metal rotor flowmeter, vortex flowmeter, liquid turbine flowmeter, ultrasonic open channel flowmeter, ultrasonic flowmeter, etc.

Advantages of Clamp on water flow meter for water measurement:

1. External clamp installation, without damaging the pipeline. easy and convenient.
2. It is convenient to measure ultra-small and ultra-large pipes. As small as Φ9.5. As large as DN6000.
3. Electromagnetic flowmeter is used to measure the volume flow of conductive liquid with conductivity greater than 5μS/cm. Then other water flow with conductivity less than 5μS/cm can be measured with ultrasonic clamp on water flow meter. For example, ultrapure water.
4. For pure water, drinking water, etc., it is necessary to keep clean and hygienic. If contact flow meters such as turbine flow meters and orifice flow meters are used, the material must be strictly required. At least 316SS material is required. Then the cost of the contact flowmeter will be very high.

Read more about: Non-invasive Ultrasonic Tank Level Sensor Working Principle

Portable clamp-on ultrasonic flow meter

Sino-Inst, Manufacuturer for Clamp on Ultrasonic Flow Meter. It can measure a single sound-conducting liquid medium of DN 25—1200mm. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Clamp on Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.