Flow control per ultrasonic

01 September 2009

With its Type 8081 ultrasonic flow transmitter, Bürkert Fluid Control Systems launches a transmitter for monitoring or controlling aqueous solutions. Thanks to the ultrasonic technology, the 8081 is also ideal for all applications where flow in a highly dynamic range (up to 1:500) needs to be measured with great accuracy (2% oR + 0.01% FS) using sensors with no moving parts. This very high dynamic range significantly restricts the types of suitable flow sensors.

With its Type 8081 ultrasonic flow transmitter, Bürkert Fluid Control Systems launches a transmitter for monitoring or controlling aqueous solutions. Thanks to the ultrasonic technology, the 8081 is also ideal for all applications where flow in a highly dynamic range (up to 1:500) needs to be measured with great accuracy (2% oR + 0.01% FS) using sensors with no moving parts.

This very high dynamic range significantly restricts the types of suitable flow sensors.The measurement principle behind the 8081 is based on the transit time technique: two piezo-electric sound converters (transmitter-receiver) transmit and receive the sound waves. The sound travel times are measured in the nanosecond range. The ultrasonic signal moves faster in the flow direction than in the opposite direction: the difference in transit time is directly proportional to the flow speed and can therefore be used to determine the flow rate. An integrated patented measurement pipe generates an homogenous flow profile so that no flow-settling sections are required in the inlet and outlet.

The 8081 has no moving parts. The transmitter fittings are made of brass, the measuring tube is made of PES, and the seal is made of EPDM. The passive reflector is made of stainless steel. Power is supplied to the 8081 by an M 12-5 pin connector.