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Ultrasonic flow transmitter

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Ultrasonic flow transmitter

Valmax’s Ultrasonic flow transmitter is a type of flow Transmitter that measures the velocity of a fluid with ultrasound to calculate volume flow.

The Ultrasonic flow transmitter measures the difference of the transit time of ultrasonic pulses propagating in and against the flow direction. It is affected by the acoustic properties of the fluid and can be impacted by temperature, density, viscosity and suspended particulates depending on the exact flow Transmitter. Unlike mechanical flow meters such as turbine, vortex, malfunction, etc), the only minimum maintenance cost is required because there are no moving parts.

Ultrasonic flow transmitter

Mechanism of Ultrasonic flow transmitter

Valmax’s liquid ultrasonic flow transmitter is capable of propagating from two ultrasonic sensors.
The volume flow rate is calculated based on the measured flow rate using the transmission time difference of the ultrasonic signal.

Flow of Fluid

It transmits an analog signal (4mA/1V) corresponding to a flow value of zero because the transmission time of the ultrasonic signal propagating from the two ultrasonic sensors is the same.

Non-Flow of Fluid

Ultrasonic signals propagating in the same direction as the flow of the fluid are received faster than the stationary state, and ultrasonic signals propagating in the opposite direction to the flow of the fluid are received slower than the stationary state.
The flow rate can be measured using the difference in transfer time under the above conditions, and our ultrasonic flow meter outputs an analog signal (up to 20 mA / 5 V) corresponding to the calculated volume flow rate based on the derived flow rate.


Ultrasonic flow transmitter

Technical Specification

water/ultra-pure/refrigerant/solvent/chemical solutions
15mm(1/2”) : 0.5~30 LPM
20mm(3/4”) : 1.0~50 LPM
25mm(1”) : 2.0~100 LPM
±0.5 % of F.S.
Stainless Steel 316L
Working Temperature
-40~120 ℃
Working Pressure
0.6 ∼ 20 bar
±0.5 %
±0.5 %
24 VDC
Lok Tube Type

Ultrasonic flow transmitter


Ultrasonic flow transmitter

Special Features

Minimum Maintenance

No moving parts, highly / durable & minimizing / maintenance costs.

(All Stainless Steel Wetted Parts)

High Accuracy

±0.5% measurement accuracy

Various Application

Applicable to corrosive liquids.

No Pressure Loss

Designed to minimize interference with flow in the piping.