Past Product of The Month 

The Greyline Portable Doppler Flow Meter has been totally redesigned.  The data logging memory capacity has been increased for 50,000 points to over 300,000 points.  Data is now downloaded via a USB port to a laptop replacing the RS232 port.

The PDFM can still be used on pipes ranging in diameter from 0.5 inch to 180 inches as long as there is at least 2% bubbles or particulate at the point where flow is being measured.  There is an overlap between Transit Time and Doppler between 1.5% and 3% depending on the application.  We can explore the applicability of the instrumentation best suited to your requirement if we can define the application.

Battery life has been increased from a maximum of 8 hours between charges to 18 hours.  If sleep mode is used, the battery will last longer.

The instrument is smaller and lighter.  The housing will now fit in your hand and the carrying case is now a hard sided case rather than the soft sided Cordova case that has been used for years.

The PDFM is ideal for verifying flow in applications involving “dirty” fluids and for troubleshooting flow anomalies in process applications.

For permanent installations the DFM 5.0 is available.

Both instruments use Greyline’s menu structure for quick commissioning.  Typical startup is under five minutes.

See Greyline in the Product Selection Guide for details or to download literature and manuals.

  • The totalizer works even if the DFM 5.0 is calibrated in velocity mode
  • Data logging units are independent of calibration units
  • Changing measurement units in the DFM 5.0 does not require a restart of the data logger
  • Twenty-four hour flow reports are created independent of regular logging
  • The DFM 5.0 will provide a flow reading as long as there is 1 bubble or particle every ten seconds; if the concentration falls below that level, the instrument reads zero
  • The firmware has been configured to disregard non-flow related inputs (such as pipe vibration)
  • A new sensor configuration has been created to enhance the ability of the instrument to read flow in difficult applications
Please click on the images or names of the products below to learn more about their respective specifications and uses.