Home > Panametrics large-pipe, high-velocity, clamp-on gas flowmeter from AMS Instrumentation and Calibration

Panametrics large-pipe, high-velocity, clamp-on gas flowmeter from AMS Instrumentation and Calibration

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The DigitalFlow CTF878 clamp-on gas flowmeter from AMS Instrumentation and Calibration utilises a new technology called correlation tag (patented) to determine gas flow rate. The DigitalFlow CTF878 clamp-on gas flowmeter from AMS Instrumentation and Calibration utilises a new technology called correlation tag (patented) to determine gas flow rate.

Features of the clamp on gas flowmeters include:

  • The CTF878 clamp-on gas flowmeters are used on plastic and metal pipes from 150 to 750 mm in diameter
  • Accuracy on the clamp-on gas flowmeters is better than ±2 percent of reading—with repeatability of ±0.6 percent of reading. The turndown ratio is 43-to-1
  • A complete system comprises the DigitalFlow CTF878 clamp on gas flowmeters electronics, two pairs of advanced clamp-on gas ultrasonic transducers, two preamplifiers for the receiving transducers and a clamping fixture to mount the transducers on the pipe
  • The DigitalFlow CTF878 uses an ultrasonic signal pattern recognition technology, called correlation tag, for flow measurement
  • Correlation tag technology utilises a total of four clamp-on transducers externally mounted on a pipe. The transducers are arranged in two pairs, one upstream and one downstream. Each pair includes one transmitter sending ultrasound in a continuous wave mode through the fluid to its receiver, forming an upstream and downstream interrogation path
The received ultrasonic signals are demodulated and processed through a correlation algorithm. With turbulent flow conditions, a distinct correlation peak is recorded, which reflects the time it took for the unique turbulence signature to travel past each ultrasonic interrogation path. Since the distance between each interrogation path is defined in the transducer set-up, the flow velocity is determined by dividing distance by the time it took for the turbulence signature to pass between each interrogation path.

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