Transit-time Clamp-on Portable Ultrasonic Flowmeter – TUF339


isolvThe measuring principle of portable ultrasonic flowmeter is based on ultrasound transmission through a liquid. Transit time measuring technique utilizes two transducers, which function as both ultrasonic transmitters and receivers. The ultrasound waves traveling in the direction of the flow of the liquid require less time than when traveling in the opposite direction. The subsequent time difference is directly proportional to the flow velocity in the pipe. Having measured the flow velocity and knowing the pipe cross-sectional area, the volumetric flow can be easily calculated.

  • Non-invasive type measurement, no interruption to process and no risk of contamination. It takes
    just a few minutes to install and there is no need to shut down flow or drain the system
  • With capabilities of measuring bi-directional flow and pipe diameter range from 13mm to 2000mm
  • Datalogging function, 98000 data points logged events distributed across up to 20 sites.
  • RS232/USB output facility that can be used to download logged data to a PC or printer.
  • 4-20mA/Pulse output, USB, RS232 cables are provided as standard with the flow meter.

• Water/wastewater
• Building Energy Management
• Semi Conductor Industry
• Pharmaceutical
• Petrochemical
• Food and beverage

Technical Details
Measuring Range Two transducer for different pipe diameter
‘ A’ transducers - 13mm - 115mm - Optional
‘ B’ transducers – 50mm – 2000mm - Standard
Flow Accuracy • Pipe ID >75mm - ±0.5% to ±2% of flow reading
for flow rate >0.2m/s
• Pipe ID in range 13mm - 75mm - ±3% of flow reading
for flow rate >0.2m/s
and ±6% of flow reading for flow rate < 0.2m/s
• Flow velocity corrected for
Reynolds number over entire velocity range
Repeatability ±0.5% of measured value or ±0.02m/s
whichever is the greater
Selectable Flow Units litres, gal, USgals, Barrel, m³
Total volume – 12 Digits - forward and reverse
Flow Range 0.1 to 20m/sec (bi directional)
Transducer Temperature Range -20°C to +135°C
Pipe Material Constructed of Any Sonic Conducting Medium Such As: Carbon Steel
Stainless Steel
Galvanised Steel
Mild Steel
Permitted Pipe Linings Include: Rubber
Enclosure Protection Class IP67
Material Flame retardant injection moulded ABS
Dimensions 264mm x 168mm x 50mm
Weight 1.1 kg (including battery)
Number of keys 16
Display 240 x 64 pixel graphic display, high contrast black-on-white, with backlight
Fixing Wall mountable
Operating Temperature -20°C to +50°C
Storage Temperature -25°C to +65°C
Operating Humidity 90% RH MAX at +50°C
Output Analogue Output
No. Channel 1
Range 4–20mA, 0–20mA, 0–16mA
Resolution 0.1% of full scale
Error Current Adjustable between 0–26mA
Isolation 1500V Opto-isolated
Maximum Load 620 Ohms
Pulse Output
Output Type One open collector opto-isolated digital output
Pulse Repetition Up to 500 pulses/sec (depending on pulse width)
Pulse Wwidth 500ms for 1pulse/s5ms for 100 pulses/s
Max Current 150mA
Output Type Two opto-isolated relay
Logged Data Time-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 Points 98,000 (98k) logged events distributed across up to 20
sites. All free memory is allocated by demand.
Programmable Logging Interval 5s to 1hr. The screen updates to show the end
time of memory remaining as sample units are selected.
Manual/Auto Control Logging can be started and stopped manually or set for
automatic (timer) operation.
Memory Overflow User selectable to either overwrite old data or stop logging.
Download Log Logged 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 Interface TUF339 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 Range 9–24Vdc
Power Consumption 10.5W
Battery Charger Manufacturer: Model ECO-181WP12
Input voltage range: 90–264Vac
Battery Pack Technology: 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.

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