The technology of ultrasonic flowmeter

Ultrasonic Flowmeter
The last ten years ultrasonic flow meter is very popular not only in the laboratory but also in many industries such as industrial water treatment, industrial waste water treatment, food and beverage industry and chemical industry. Due to popular demand, Ultrasonic flow meter effective enough because the price is not too expensive and inexpensive installation costs and maintenance costs can be said to be free maintenance
sensor ultrasonic flow meter

Another advantage is the use of ultrasonic flow meter accuracy is adequate and flexible. With ultrasonic flow meters, the user can choose from a variety of electronic packages, and also use the device in areas requiring explosion-proof devices. value-added benefits this provides a striking contrast to the turbine or variable-area flow meters, which is less accurate, offers the ability to output less invasive to the process media.

portable ultrasonic flow meterpengetesan aliran air 

As any engineer knows, ultrasonic flow meters measure the velocity of a liquid through a pipe by using ultrasonic transducers. The results are variable depending on the temperature, density or viscosity of the liquid. Some meters are also able to measure the liquid level and this, with the pipe size, enables the correct calculation of the flow rate and total discharge involved.

The most significant advantage of ultrasonic flow meter is an ultrasonic flowmeter ability to measure flow without disrupting the flow of both liquid and gas. Noninvasive Measurements were taken from two or more transducers attached to the exterior of the pipe. Shift the frequency of the ultrasonic signal sent through a liquid or gas is measured, then the signal is sent through a cable to the electronics housed in the flow computer.

Other advantages of using ultrasonic flow meters include :

  • Improved accuracy
  • No pressure drop
  • High turn-down ratio
  • No moving parts
  • Minimum maintenance
  • Long-term cost savings

Choosing the type and model of Ultrasonic Flow meter

To determine what type and model of ultrasonic flow meter that best matches our desires and effective for a particular application is to consider where and how the flow meter will be used. There are three types of ultrasonic flow meter the most preferred and and find that the Hand Held ultrasonic Flow Meter, portable Ultrasonic flow meter and Open Channel Flow Meter.

These are non-intrusive, clamp-on devices used to measure flow in pipes ranging from 10 mm to 10,000 mm in diameter with incredibly high accuracy.  In fact, independently certified meters have achieved accuracy better than 1% of the actual flow. This is a robust range of flow meters suited to a wide variety of water quality, with pipe sizes ranging from 15mm to 500mm in diameter and pulse emitters being able to be fitted to the flow meters if necessary.

Hand Held Ultrasonic Flow Meters / Portable Flow Meters

Portable ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, An Ultrasonic flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and against the direction of the flow.

Handheld flow meters are most commonly used to measure slurries and dirty fluids in the chemical industry, food processing and water treatment plants where basic flow measurement is occasionally required. Facility engineers working in office buildings or small-scale process plants frequently need to monitor HVAC-R systems. Typically, these engineers will use a handheld unit to accomplish this task.

handheld ultrasonic flow meter ultrasonic flow meter jinjing

Features and Benefits

  • High accuracy measurement. Accuracy +/-1.0% of reading; Repeatability +/- 0.3% of full scale;
  • Linearity +/-1.0% of reading.
  • Flowrange 0 to 12 m/s.
  • Non-intrusive, clamp-on installation. Easy and fast. No moving parts.Maintenance free. Light weight, Handheld design.
  • Suitable for all commonly used pipe materials and liquids Suitable for pipes from 25- 1200mm
  • 11 VDC rechargeable lithium-ion battery for continuous operation for up to16 hours
  • Wide measurement temperature range 0-80 Degrees C.
  • Built-in data logger and flow totalizers.
  • Self-explanatory user interface. Easy to operate.
  • 2 Gb SD memory card for high capacity
  • Data logging (512 files max; interval 5 to 60 seconds)
  • NEMA 13 (IP 54) transmitter with tactile
  • Entry keys and 64 x 128 alphanumeric backlit LCD.
  • Ambient conditions 0-60 Degrees C Up to 99% relative humidity (noncondensing).
  • Encapsulated transducers; IP 68 with 16 ft (5m) standard cable.
  • Lightweight 2.2lb (1.0kg) and easily transportable.
  • Low installation effort and costs. 
  • Clamp-on sensors require no pipe cutting or process interruption and no plant shutdown Magnetic sensor clamping fixture with slip scale gauge. Chain straps included for nonmagnetic pipe.
  • Hygienic measurement, no risk of contamination, suitable for ultra clean Liquids
  • Supplied in convenient carrying case holding all components including transducers ,transducer leads, two magnetic transducer carriers, carrier chains, acoustic couplet grease, instructions manuals

Clamp on Ultrasonic Flow Meter

Clamp-on flow meter is a flow meter that is very cheap and easy installation, because it does not have to damage the pipe designed for applications where production should not be stopped, because the installation of flow meters is done with puncture, cut and weld pipe. It is ideal for process measurement in applications where users previously had not installed an in-line flow meter and for applications where large line sizes or exotic materials are required for in-line measurement technologies.

inline ultrasonic flow meter

Clamp on Ultrasonic flow meter use Transducers that clamped on to the outside of the pipe so it is not necessary to cut pipes or stop flow for installation and there is no pressure loss. Clamp on Ultrasonic flow meters can measure various types of liquids such as potable water, river water, industrial water, agricultural water, waste water, seawater and pure water.


  • Non-invasive clamp-on Technology
  • Easy to install
  • No pressure drop, moving parts, leakage or corrosion
  • No pipe cutting or process interruption
  • Measurement independent of fluid properties
  • Wide Bi-directional flow range
  • The ultrasonic transduxer being clamp-on type, there’s no pressure loss. The transit time sensors are easily mounted on the surface of the pipe without interrupting the flow for installation or maintenance.
  • Advanced intelligent display, computation and printing(data logger) to suit user’s diversified requirement. The flow rate and volume is displayed in all pertinent engineering units. It runs out of regular AC power (110V/220V), built-in batter or DC power.
  • Using the most advanced direct-time-measuring method, the meter offers a signal resolution of 0.2ns. In addition, advanced data processing functions ensure high linearity.
  • Signal outputs including current signal, frequency signal, serial data, switch outputs(1 OCT and 1 relay output). All the outputs displayed on the unit can be transmitted to a PC via RS-232/485 for further processing or storage.
  • Clamp on ultrasonic is designed to measure the fluid velocity of liquid within a closed conduit. The transducers are a non-contacting, clamp-on type, which will provide benefits of non-fouling operation and easy installation.
clamp on ultrasonic flow meter
Clamp On Ultrasonic flow meter operates using transit time measurement. By measuring the time it takes a sonic signal to travel a known distance with the flow stream and another signal travelling against the flow stream, it determines the velocity of the fluid being measured. With the sonic properties of the fluid and the pipe material factored in, users get an extremely repeatable accuracy on the volumetrics flow rate being measured. Because the transmitter can process the signal of one or two sensors, it ensures additional economy and the ability to compare or contrast two flow streams, if required. The product is ideal for users looking for a process measurement device that is easy to install and can maintain flow measurement for clean liquids.​

In Line Ultrasonic Flow Meters

In Line Ultrasonic flow meter it make the main board of flowmasonic WUF-100IR connect to a 20 lines 4 keys parallel port keyboard monitor, then encapsulate them in a sealed enclosure, realize on-line display and operation on spot.

It solved the problem that owing to the reason of people that make the measured pipe parameters inaccuracy, caused errors that lowered the measurement accuracy during the period of installing the clamp-on type and insertion type transducers .it has the advantages of high accuracy, wide measurement range, no pressure lost, easy installation, no need to set parameter, etc. It is the future for the flow meter and heat meter.

Technology features :

  1. Operating power :AC 85—264V or isolation DC 24V
  2. Current : 50 mA (under the condition of connection without keyboard display and sound of buzzer)
  3. Output optional : 
    1. One channel standard isolation RS485 output, 
    2. One channel isolation 4-20mA or 0-20mA passive output.
    3. Two channel OCT output (programmed between the pulse width (6-1000 ms),default before leaving factory (200 ms))
  4. Input optional : two channel three wire system PT100 platinum resistor input loop,to make heat meter has the function of displaying heat quantity.
  5. Display : 2*10 back light LCD(Chinese and English optional)
  6. Operating : magnetic 4 keypads to operate
  7. Other functions : 
    1. Automatic memory the positive, negative, net totaliser or flow rate and heat quantity of the last 512 days, 128 months, 10 years 
    2. Automatic memory the time of power turning on and off and flow rate of the last 30 times, realize to compensate by hand or automatically read the datas through Modbus communication protocol.
  8. Protection level : IP68
  9. Optional accessory :
    1. PT100 three wire platinum resistor( a pair,used for heat meter)
    2. Ultrasonic thickness gauge: (measure the thickness of pipe,reduce error,increase accuracy) 

Open Channel Ultrasonic Flow Meter

Open channel Ultrasonic flow meters measure the level in a channel by transmitting a pulse of sound from the face of the sensor to the surface of the flow stream and measuring the time for the echo to return. The transit time corresponds to the distance between the face of the sensor and the surface of the water. When the meter is initially set up, a pre-determined distance (or level in some meters) is set. This distance is either the zero level (no flow present) or a specific level in the flume or weir. With this initial calibration it is only a matter of simple arithmetic to determine the liquid level. This level is then applied to either pre-programmed discharge equations or strapping tables to output a flow rate 

Because the sensor is not in contact with the water, ultrasonic sensors have no scheduled maintenance. Ultrasonic sensors are not affected by chemicals, grease, suspended solids, or silt in the flow stream.
open channel ultrasonic flow sensor