US300FM Ultrasonic Flowmeter

    The model US300FM is an ultrasonic flowmeter for measuring liquid flow in a fully filled pipe. With the advanced signal processing and correlation detection method, US300FM provides fast, accurate, and no-zero offset flow measurements in clean to dirty fluids.

    Comes with transducers in three sizes that accommodate pipe sizes from 25mm to 6500mm

Yokogawa's transit-time ultrasonic flowmeter, with our advanced technologies, provides fast and accurate measurements in clean to dirty liquids, requiring no zero flow adjustment.

US300 Series
The measuring principle of transit-time ultrasonic flowmeters is based on the influence of the flowing fluid on the traveling time of the ultrasonic signal. The signals are transmitted through the pipe and the transit time difference between the forward and backward signals is used to determine the flow velocity.

The transducers are clamped on the outer pipe wall without touching the liquid. Thus, there is no risk of contamination and it is suitable for ultra clean liquids. There is also no risk of corrosion, which is suitable for aggressive liquids as well.

Yokogawa's transit-time ultrasonic flowmeter, with our advanced technologies, provides fast and accurate measurements in clean to dirty liquids, requiring no zero flow adjustment.

Advanced technologies

 

-	Easy installation
	The transducers are individually calibrated when shipped, and are easy to install on-site. The calibrated data is stored in the Sensor ROM. For portable type meters the Sensor ROM is built-in. For fixed type meters it is set in the main units. The combination of the transducers with the Sensor ROM requires no adjustment of the zero flow condition.
-	Improved measurement ability under difficult conditions
	With our noise suppression technique combined with correlation detection methods, measurement capability against air bubbles in the fluid has been improved.
-	Fast response
	With our original signal processing, fast and accurate measurement has been realized, even using correlation methods which previously required extended calculation time.

 

Measuring principle of transit-time ultrasonic flowmeters

The transit-time ultrasonic flowmeter utilizes the propagation time of the ultrasonic signal in the fluid.

A pair of transducers are installed on the outer surface of the pipe as shown in the diagram. Each transducer works alternatively as both transmitter and receiver of ultrasonic signals.

When the ultrasonic signal is transmitted toward the upstream side against the flow direction, more propagation time is required (T1). On the other hand, when it is transmitted toward the downstream side with the flow direction, the propagation time is less (T2). That is, the signal is delayed or speeded up by the moving fluid. The difference in time between "T1" and "T2" is proportional to the flow velocity, and the flow volume can be calculated by multiplying it by the cross-sectional area, which is obtained by using the pipe diameter and wall thickness.

• More accurate measurements under difficult conditions

• New noise suppression technique improves accuracy of measurements with fluids where air bubbles are present

• Fast response

• Yokogawa signal processing technology improves the speed and accuracy of measurements

• Easy installation and adjustment of transducers

• Transducers are small and light – can be held in one hand

• Each sensor calibrated before shipment, eliminating need to tune on-site

• No longer necessary to adjust the zero flow condition

• Easy setup with interactive parameter setting process

• Two flow-input channels are provided as an option

• A maximum of two current outputs enable the simultaneous measurement of flow and sound velocity