Engineering Specifications
Portable Ultrasonic Flow Meter
Greyline Portaflow PT500 for 13 to 2000 mm Pipes


SCOPE: This specification covers a portable, ultrasonic Transit Time flow meter by Greyline Instruments, Massena, New York / Long Sault, Ontario. This portable instrument shall provide for non-intrusive flow measurement, indication, totalizing and transmitting of the flow rate in a full pipe.


Each portable Transit Time flow meter shall have the following design features and engineering specifications:


  1. Have an accuracy of 2% of reading in most clean fluid applications. Have repeatability of 0.5%.
  2. Operate on clean liquids in full pipes with less than 2% solids or gas bubbles.
  3. Operate on any sonic conducting pipe material such as carbon steel, stainless steel, galvanized steel, mild steel, copper, UPVC, PVDF, glass, brass and including pipes with bonded liners of epoxy, rubber or cement.
  4. Operate on AC/DC power. Include an internal NiMH rechargeable battery with capacity for 16 hours continuous battery operation. Recharge and operate with power input of 100-260VAC 50-60Hz.


  1. Have two sets of dual clamp-on transducers operating at 1MHz and 2MHz.
  2. The transducers shall be waterproof and operate continuously at temperatures from -4F to 275F (-20C to 135C).
  3. The transducers shall be designed to install on pipes from 0.51" to 78" (13 to 2000 mm) outside diameter.
  4. Have a 6 ft (2 m) long cable from the transducers to the electronics.
  5. Shall include manufacturer's recommended sensor coupling compound.
  6. Shall include stainless steel sensor mounting guiderails with clamps permitting installation and removal of transducers.
  7. Shall include a transducer test block to allow the transducers and inter-connecting cables to be functionally checked.


  1. Have a portable, hand-held ABS enclosure plus a padded IP67 watertight carrying case containing the flowmeter, sensors and accessories. Total shipping weight shall not exceed 15 lbs (6 kg).
  2. Electronics shall be designed for continuous operation at temperatures from 32 to 122F (0 to 50 C).
  3. Have a built-in 16-key programmer with user-friendly calibration menu and language selection including English, French, Spanish, Portuguese, Russian, Norwegian and Dutch.
  4. Have a 64 x 240 pixel backlit LCD graphics display indicating positive and negative flow rates and flow totals, calibration menu, signal strength, battery charge status, date and time.
  5. Have a 98,000 point data logger recording time and date stamped readings.
  6. Have RS232 and USB outputs for data transfer to a Windows PC.
  7. Have flow proportional opto-isolated 0/4-20mA output rated to maximum resistive load of 620 ohms. 
  8. Have a response time of less than 500 ms and sampling resolution of 50 picoseconds.
  9. Have adjustable Reynolds number compensation for pipe wall roughness.
  10. Have automatic signal strength monitoring and indication.
  11. Have a battery status indicator with automatic low battery shut off and battery overcharge protection.


The instrument shall be a Portaflow PT500 Portable Ultrasonic Flow Meter by Greyline Instruments Inc., and warranted against defects in materials and workmanship for one year.

Specifications are subject to change without notice. 

Please contact Greyline if you need more information or for advice in your application. We can provide quotations and refer you to the Greyline sales representative in your area. (To receive complete information please provide your name, mailing address, phone and fax numbers):

Greyline Instruments Inc.
16456 Sixsmith Drive
Long Sault, Ont. K0C 1P0
Tel: 613-938-8956 / 888-473-9546
Fax: 613-938-4857
Greyline Instruments Inc.
105 Water Street
Massena, NY 13662
Tel: 315-788-9500 / 888-473-9546
Fax: 315-764-0419

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