PTFM 6.1 Portable Transit Time Flow Meter
Designed for challenging flow applications in industrial environments. Easily deployed whenever you need it. it only takes a few minutes to configure the PTFM 6.1 with your application parameters, install the transducers without interrupting your process, and begin measuring flow. With multiple transducer sets optimized for a wide range of pipe sizes and materials, new and more powerful signal processing hardware, standard factory calibration, and intuitive on-screen diagnostics, the PTFM 6.1 provides maximum confidence in the accuracy and reliability of your measurements.

Whether you need flow measurement when you didn’t have it before, or you need to prove that your existing system is performing properly, the PTFM 6.1 is here to help by providing accurate, non-invasive flow measurement in the most challenging industrial environments and applications, with minimal installation complexity and cost. With new and more powerful signal processing hardware, rugged IP67 design, and three interchangeable, non-invasive transducer sizes optimized for a wide range of pipe sizes and materials, the PTFM 6.1 is the right choice for your on-the-go or long-term flow measurement applications.

Set up the 12 million point data logger to store time and date-stamped flow readings from 10-second to 60-minute intervals. View the convenient on-screen Flow Report where total, minimum, maximum, and average flow rates are stored in a 24-hour daily summary for the last 365 days. Download the flow logs and 24-hour report data by inserting your USB drive into the meter. The included Greyline Logger software displays data in both graph and table formats with one-click export to Microsoft Excel, images, or CSV files for use in other programs.


  • Treated Water
  • Raw Water
  • Cooling Water
  • Chemicals
  • Hydraulic Oil
  • Demineralized Water
  • ​Water/Glycol Solutions 
  • Diesel & Fuel Oils
Technical Specifications
General Specifications
Spec name: Description:
Operating Parameters
For clean fluids in full pipes, with typically less than 2% by-volume concentration of solids or bubbles. Also suitable for
wastewater or sludge flows with low solids concentration
Configuration Built-in 5-button keypad interface with English, French, and Spanish menu language selection
Electronics Enclosure IP67 when transducer cables connected, aluminum enclosure with silicone end covers
• ±1% of reading or ±0.0046 m/s (±1.5 ft/s), whichever is greater
• Repeatability & Linearity: ±0.25%
Power Input
• Built-in rechargeable lithium polymer battery for up to 15 hours continuous operation
• External mains to USB-C charger with 100-240V AC, 50-60Hz, 0.6A input; and 5.0V DC, 3A, 15W output
Display Color TFT LCD display, IPS type, 2.8” screen size, 320 x 240 resolution, 500 NITS brightness, super wide view
Outputs Log files, daily log files, parameter settings files, and waveform capture files via USB-C flash drive (included)
Data Logger
12 million point capacity, configurable for velocity or flow rate, date and time stamped, configurable format for Greyline
Logger Software (LG2) or CSV, available intervals of 10 s, 30 s, 1 min, 2 min, 5 min, 10 min, 15 min, 30 min, and 1 hr
PC Software Free Greyline Logger Software for Windows. For display, manipulation, analysis, and exporting of data.
Operating Temp. (Electronics) -20 °C to +60 °C (-5 °F to +140 °F)
Carry Case IP67, with protective molded foam, with room for all transducer sizes and installation hardware
Approximate Shipping Weight 5.5 kg (12 lbs)
Language Selection English, French, Spanish
Approvals CE

Spec name: Description:
Pipe Diameter,
SE16A: Recommended for 15 mm to 40 mm (0.5 in to 1.5 in), Suitable for 15 mm to 150 mm (0.5 in to 6 in)
SE16B: Recommended for 50 mm to 250 mm (2 in to 10 in), Suitable for 50 mm to 1,200 mm (2 in to 48 in)
SE16C: Recommended for 300 mm to 1,200 mm (12 in to 48 in), Suitable for 100 mm to 1,200 mm (4 in to 48 in)
Pipe Materials:
Any metal or plastic sonic conducting material including carbon steel, stainless steel, ductile iron, concrete-lined ductile
iron, cast iron, PVC, HDPE, PVDF, fiberglass, copper, brass, aluminum, and pipes with bonded liners including epoxy,
rubber, and Teflon
Flow Velocity  ±0.03 m/s to 12.2 m/s (±0.1 ft/s to 40 ft/s) typical
Operating Frequency
SE16A: 2.56 MHz
SE16B: 1.28 MHz
SE16C: 640 kHz
-40 °C to +150 °C (-40 °F to +300 °F)
Mounting Kit
SE16A: Includes stainless steel track with pipe clamps, built-in ruler, and coupling tape.
SE16B: Includes set of stainless steel transducer brackets, clamps, alignment bar, and coupling tape.
SE16C: Includes set of stainless steel transducer brackets, clamps, alignment bar with built-in ruler, and
coupling tape.
Transducer Cable
1 pair, triaxial, 3.4 m (12 ft) with waterproof plug & socket connector for electronics, and BNC connector with seal jacket
for transducers
Ingress Protection
IP65 with seal jackets installed. IP67 when installed with Super Lube synthetic grease inside BNC connectors and seal


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How It Works: Transit Time Flow