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With its Type 8081 ultrasonic flow transmitter, Bürkert Fluid Control Systems launches a completely new transmitter for monitoring or controlling aqueous solutions. Applications include monitoring the cooling water during robot welding, injection moulding, die casting, as well as monitoring coolants in metal cutting applications. Thanks to the ultrasonic tech-nology, 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 suit-able flow sensors.
Measurement principle
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 crucial point is that the ultrasonic signal moves faster in the flow direction than in the opposite direc-tion: the difference in transit time is directly proportional to the flow speed and can there-fore be used to determine the flow rate. An integrated patented measurement pipe gener-ates an homogenous flow profile so that no flow-settling sections are required in the inlet and outlet.
Ten versions
Bürkert’s 8081 transmitter comes in various models for five flow ranges : Either with a Pulse-PNP outlet or a Pulse-PNP outlet, and an additional 4-20 mA current output.
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