Trumsense ultrasonic open channel flowmeter with recording is mainly used in farmland irrigation channels, enterprise sewage outlets, sewage treatment plants, hydropower stations, ecological discharge flow monitoring, etc.

Item No.: 00249
With IP68 probe, long service life, can provide instantaneous flow value and cumulative flow value, can work for a long time in harsh field and sewage water quality
Description Review

Ultrasonic open channel flowmeter is composed of ultrasonic probe for liquid level measurement and flow calculation transmitter. According to the different structure, it can be divided into integrated type and split type. It is suitable for measuring the flow of rectangular, trapezoidal and U-shaped open channels such as reservoirs, rivers, water conservancy projects, urban water supply, sewage treatment, farmland irrigation, water administration and water resources. Ultrasonic open channel flowmeters need to be measured together with weirs and grooves. Commonly used weirs and grooves include Parshall grooves, rectangular grooves, triangular weirs, etc. The appropriate matching method can be selected according to different site environments.



The instrument can directly display the instantaneous flow and cumulative flow, built-in EEPROM digital memory, to ensure that the data will not be lost after a power failure. The instrument is also equipped with explosion-proof probes specially designed for petroleum and chemical sectors to meet the measurement requirements of sewage flow in explosion-proof areas in petrochemical and other sectors (explosion-proof grade EX ia II BT4), especially suitable for flow measurement of oily wastewater.



This instrument can be matched with various national standard weirs or tanks, and can be widely used in the measurement or monitoring of the total discharge of various water quality. The measurement results are not affected by water quality. The ultrasonic open channel flowmeter also has a variety of built-in algorithms, suitable for a variety of standard weirs and grooves, and optional communication interface, which is easy to connect with other DCS systems to realize industrial remote monitoring and control.


Working Principle:

The ultrasonic open channel flowmeter is used with the corresponding parshall tank, triangular weir, rectangular weir and other weir tanks. It uses the propagation law of ultrasonic waves in the air to measure the liquid level height, and continuously transmits the liquid level information to the host computer. The system automatically measures the instantaneous flow and cumulative flow and stores them. This instrument adopts international advanced technology to complete flow detection without contact with fluid, and has perfect liquid level measurement function, control function, data transmission function and man-machine communication function. This machine is a flow measuring instrument integrating ultrasonic transceiver sensor, servo circuit, temperature compensation sensor and compensation circuit unit, accumulating host, display, control signal output and serial data or analog output unit.

In many non-full water, large flow (or small flow), and natural flow free water surface state, the flow of fluid is measured, which is called open channel flow detection. Due to the large or small flow of the open channel, there is often a certain degree of corrosiveness or some impurities in the fluid. It is very difficult to use a general pipeline flowmeter to detect the flow. For example, in the fields of industrial enterprise drainage, hospital wastewater, agricultural irrigation water, urban underground water drainage and other fields, open channel flow detection, especially non-contact ultrasonic open channel flowmeter, is the preferred flow monitoring instrument.



Technical index

● Accumulated flow range: 0-9999999 (full 8 bits are cleared, at the same time, the accumulated times are incremented by 1, and the flow unit is set according to the setting)

 Instantaneous flow range: 10L /s~100m3/s (determined by the type and specification of the weir tank)

 Flow Accuracy: 5%

 Blind zone: 0.06-2m (depending on different sensors)

Ranging range: 1, 2, 5, 8, 10, 12, 15, 20, 25, 30, 35, 40m The standard range is 2m (optional

    high-precision small blind zone type or larger range type)

Probe material: ABS material

Protection class: IP65

Cable length: 10 meters shielded cable (any length can be customized)

Host performance: Chinese 3 o'clock LCD, 18-bit keyboard operation, M16*1.5 electrical interface

Power supply mode: AC85-380V or DC11~24V power supply

Power consumption: 5W

Input signal: Ultrasonic probe, RS485 serial port

Output signal: 1 or 2 4-20mA (standard 1), 4 relays, RS485

Sensor installation interface: standard 485 interface (24V power supply) *2

Working environment: normal temperature, normal pressure

Data Browsing: Quickly view hour, day, month, and year traffic records

Optional function: Support U disk data export, support wireless transmission, USB, GPRS, printer      (optional when ordering)


Elite features:

●  Non-contact measurement, suitable for harsh sites

IP65 protection probe, long service life

3° launch angle, can also be measured with small weir grooves

It can measure the flow of sewage discharge channels or pipes (sewers)

 Instantaneous flow value and cumulative flow value can be provided

Output signal: RS-485, Modbus, 4-20Ma current signal and multiple switches

The probe can work for a long time under harsh site and sewage water quality

Optional SMS or GPRS wireless module to realize remote telemetry




Product Size


Installation Guide:

The distance from the transmitter surface of the transducer to the lowest liquid level should be less than the range of the optional instrument;

 The distance from the transmitter surface of the transducer to the highest liquid level should be greater than the blind zone of the optional instrument;

 The emission surface of the transducer should be parallel to the liquid surface;

The instrument is installed in the center of the canal or on a static well.

The instrument should be installed upstream of the weir plate or weir trough.


Embedded installation size




Wall hanging installation size




Weir groove, weir plate production requirements:

Production requirements for weir grooves and weir plates:

● It is recommended to use FRP, PVC or stainless steel to make weirs or grooves. Triangular weir, rectangular weir

The size of the weir mouth should be accurate, and the surface of the side facing the water should be smooth; Parshall groove throat part

The size must be accurate, and the inner surface of the groove must be smooth.




Wiring Diagram:

Application Examples:

The ultrasonic open channel flowmeter uses the ultrasonic probe to measure the channel water level value by non-contact measurement, and then calculates the flow rate through the water level-flow conversion algorithm. The corresponding weir and groove (Parshall groove, rectangular weir, triangular weir, etc.) can be matched according to the site conditions of the channel, or it can be measured separately without the weir and groove. It is mainly used in farmland irrigation channels, enterprise sewage outlets, sewage treatment plants, ecological discharge flow monitoring of hydropower stations, etc.



The reasons why you should purchase from us:

● OEM ODM factory

● 7x24 hours online proposal supplied

● 100% satisfied after-sales services

Trumsense Technology is an ultrasound technology company integrating R&D, production and sales. Focusing on the R&D and production of ultrasonic material (liquid) level meters, liquid level difference meters, open channel flow meters, mud level meters, sensors, transducers and other products, it occupies nearly 45% of the ultrasonic liquid level and material level industry market.

Mainly engaged in ultrasonic material (liquid) level meter series, pressure level / transmitter series, flowmeter series.

The main application fields of the product: sewage plant water works, mines, water conservancy, power plants, chemical plants, steel plants, printing machinery manufacturing plants, etc., liquid level measurement in various industrial fields, especially sewage treatment, acid and alkaline liquid measurement.





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