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Teledyne ISCO 350 Area Velocity Sensor

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Product Description


The Teledyne Isco TIENet 350 Area Velocity Sensor measures flow stream average area velocity and liquid level. The Signature® Flow Meter uses this information to calculate the flow rate and total flow of the stream. 

How is it used?
The 350 sensor is mounted in the flow stream, normally at the bottom of the channel. It measures average velocity using continuous ultrasonic sound waves to produce a Doppler effect, in which the frequency of a wave (such as sound) passed between two bodies is relative to the motion of each. As they move nearer to each other, the frequency increases; as they move apart, the frequency decreases. The 350 sensor measures liquid level using an internal differential pressure transducer.

The 350 AV sensor is available with a 5m, 10m, or 23m cable. For greater distances, external connection via conduit, and connection of additional TIENet devices, the TIENet Expansion Box is available. Bulk TIENet cable may also be used for greater distances.

How does it measure velocity?

The 350 area velocity sensor contains a pair of ultrasonic transducers. One transducer transmits the ultrasonic sound wave. As the transmitted wave travels through the stream, particles and bubbles carried by the stream reflect the sound wave back at the sensor. The second transducer receives the reflected wave.

The sensor determines the frequency shift between the transmitted and received waves. An increase or decrease in the frequency of the reflected wave indicates forward or reverse flow. The degree of change is proportional to the velocity of the flow stream.

How does it measure level?
The 350 sensor's internal differential pressure transducer measures the liquid level. The transducer is a small piezo-resistive chip that detects the difference of the pressures felt on the inner and outer face.

The stainless steel outer diaphragm is exposed to the flow stream through the ports under the sensor. The pressure felt on the outer diaphragm is transferred to the outer face of the transducer. The inner face of the transducer is referenced to the atmosphere through the internal vent tube that runs the full length of the sensor cable.

The difference between the pressures exerted on the transducer is the hydrostatic pressure, which is proportional to the level of the stream. The analog representation of the hydrostatic pressure is digitised and sent to the Signature as an RS-485 half-duplex signal.

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