Flow Measurement

Portable Clamp-on Ultrasonic Flow Meter

TUF339 (Battery Powered)

portable clamp-on ultrasonic flow meter TUF339


The TUF339 is a portable clamp-on ultrasonic flow meter that is battery powered to provide users with the mobility and convenience to measure at any location at any time. It is designed to enable quick and easy installation at site. It supports pipeline of up to DN2000.

The TUF339 is a microprocessor-controlled instrument operated through a menu system using an inbuilt LCD display and keypad. It can be used to display the instantaneous fluid flow rate or velocity, together with totalised values, or act as a data logger. When operating in the data logger mode the logged data can be output directly to a PC or printer using the RS232/USB interface or stored in the instrument’s non-volatile memory for downloading at a later time. Up to 98k logging events can be stored internally.

TUF339 can also provide a current or variable ‘pulse’ output proportional to the detected flow rate. These outputs, which can be used with a range of external interface devices such as those found in BMS or site monitoring systems, can be calibrated to suit a particular flow range.


  • TUF339 provides non-invasive type measurement, no interruption to process and no risk of contamination.
  • Quick installation and without the need to shut down flow or drain the system.
  • Bi-directional flow measurement for pipe diameter from 13mm to 2000mm.
  • Data logging capability, with 98000 data points, logged events distributed across up to 20 sites.
  • RS232/ USB output enables export of logged data to PC or printer.
  • 4-20mA, Pulse, USB and RS232 output cables provided as standard with the flow meter.
TUF339 Portable Clamp-on Ultrasonic Flow Meter Applications:
  • Emergency stand-by monitoring
  • Leak detection
  • Survey work
  • Flow meter verification


Measuring RangeTwo transducer for different pipe diameter:
Transducers type A – 13mm – 115mm (Optional)
Transducers type B– 50mm – 2000mm (Standard)
Flow AccuracyPipe ID >75mm – ±0.5% to ±2% of flow reading for flow rate >0.2m/s
Repeatability±0.5% of measured value or ±0.02m/s (whichever is the greater)
Flow Units Availablelitres, gal, USgals, Barrel, m³
Total volume – 12 Digits – forward and reverse
Flow Range0.1 to 20m/sec (bi directional)
Transducer Temperature Range-20°C to +135°C
Pipe MaterialConstructed of Any Sonic Conducting Medium Such As:
Carbon, Stainless Steel, Copper, UPVC/PVDF, Concrete, Galvanized Steel, Mild Steel, Glass, Brass
Permitted pipe lining includes:
Rubber, Glass, Concrete, Epoxy, Steel
Enclosure Protection ClassIP67
MaterialFlame retardant injection moulded ABS
Dimensions264mm x 168mm x 50mm
Weight1.1 kg (including battery)
Number of Keys16
Display240 x 64 pixel graphic display, high contrast black-on-white, with backlight
Dimensions264mm x 168mm x 50mm
FixingWall mountable
Operating Temperature-20°C to +50°C
Storage Temperature-25°C to +65°C
Operating Humidity90% RH MAX at +50°C

Analogue Output

Range4–20mA, 0–20mA, 0–16mA
Resolution0.1% of full scale
Alarm CurrentAdjustable between 0–26mA
Isolation1500V Opto-isolated
Maximum Load620 Ohms

Pulse Output

Output TypeOne open collector onto-isolated digital output
Pulse RepetitionUp to 500 pulses/sec (depending on pulse width)
Pulse Width500ms for 1 pulse/s 5ms for 100 pulses/s
Max Current150mA


Logged DataTime-stamped flow rate. Units may be changed at time of download by selecting the corresponding unit on the keypad (e.g l, gals, USgals, m³).
Number of Data Points98,000 (98k) logged events distributed across up to 20 sites. All free memory is allocated by demand.
Programmable Logging Interval5s to 1hr. The screen updates to show the end time of memory remaining as sample units are selected
Manual / Auto ControlLogging can be started and stopped manually or set for automatic (timer) operation
Memory OverflowUser selectable to either overwrite old data or stop logging
Download LogLogged data can be downloaded to PC using RS232/USB interface. Data can be downloaded directly to facilitate ‘live’ logging, or recalled from memory to download at any time.
RS232/USB InterfaceTUF339 has a single RS232/USB output facility that can be used to download logged data to a PC or printer.
2m interface cables are supplied with the equipment.
RS232 cable is terminated with a standard 9-pin D-type connector suitable for connecting to the serial port of a PC/printer. USB cable is terminated with a standard USB connector. In each case these cables connect to an 8 pin LEMO connector on the top of the TUF339

Supply Voltage

Input Voltage Range9–24Vdc
Power Consumption10.5W
Battery ChargerManufacturer: Model ECO-181WP12
Input voltage range: 90–264Vac
Battery PackTechnology: 5-cell NiMH
Capacity: 3.8AHr
Operating time: Typically 20 hours continuous with backlight and 4-20mA output
OFF Recharge time: 6.5 Hours
Service life: >500 charge/discharge cycles

 Note: Specifications are subject to change without notice