Flow Measurement

Clamp-on Ultrasonic Flow Meter

TUF333 (For Large Pipes)

Clamp On Ultrasonic Flow Meter for Large Pipes TUF333


iSOLV TUF333  is a permanent/ fixed clamp-on ultrasonic flow meter for large pipes. It provides the option to choose between different types of transducer to support pipeline of up to DN5000.

TUF333 clamp-on ultrasonic flow meter 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 volumes. The instrument can also provide an isolated current output, or variable pulse output, proportional to the measured flow rate which can be scaled to suit a particular flow range.

TUF333 has two isolated alarm outputs are provided which can be configured in a number of ways. For example, to operate when the flow rate exceeds a specified maximum or minimum limit.


  • TUF333  provides non-invasive type measurement, no interruption to process and risk of contamination
  • Obstruction-free flow without any moving mechanical parts.
  • Fast and easy installation without the need to shut down flow or drain the system.
  • Bi-directional flow measurement for pipeline of up to DN5000.
  • Password-protected configuration menu.
  • TUF333  is able to perform signal diagnostics
  • Multi-function alarm outputs
TUF333 Clamp-on Ultrasonic Flow Meter Applications:
  • Water/wastewater
  • Building Energy Management
  • Semi Conductor Industry
  • Pharmaceutical
  • Petrochemical
  • Food and beverage


Measuring Range

Two transducer for different pipe diameter OD pipes:
• Transducers type A – 13mm to 115mm OD pipes
• Transducers type B – 50mm to 2000mm OD pipes
• Transducer type D – 1500mm to 5000mm OD pipes (Optional)

Flow Accuracy• Pipe OD >75mm – ±0.5% to ±3% of flow reading for flow rate >0.2m/s
• Pipe OD 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
Flow Units Availablelitres, gal, USgals, Barrel, m³
Total volume – 12 Digits – forward and reverse
Flow Velocity Range0.1 to 20m/sec (bi directional)
Transducer Temperature Range-20°C to +135°C
Transducer Protection ClassIP54 (Standard)
Pipe MaterialConstructed of Any Sonic Conducting Medium Such As
Carbon, Steel, Stainless Steel, Copper, UPVC/PVDF, Concrete, Galvanised Steel, Mild Steel, Glass, Brass
Permitted Pipe Linings IncludeRubber, Glass, Concrete, Epoxy, Steel


Enclosure Protection ClassIP65
MaterialFlame retardant injection moulded ABS
Dimensions280mm x 180mm x 120mm
Weight1.2 kg
Number of Keys15 key tactile feedback membrane keypad
Display240 x 64 pixel graphic display, high contrast black-on-white, with backlight
FixingWall mountable
Operating Temperature-20°C to +50°C
Storage Temperature-25°C to +75°C
Operating Humidity90% RH MAX at +50°C

Analogue Output

No. Channel1
Range4–20mA, 0–20mA, 0–16mA
Resolution0.1% of full scale
Error CurrentAdjustable between 0–26mA
Isolation1500V Opto-isolated
Maximum Load620 Ohms

Pulse Output

Output TypeOne opto-isolated relay
Pulse RepetitionUser programmable from 1 to 250 ppm
Pulse WidthUser programmable from 2ms to 500ms
Max Current500mA
Max Voltage48V


Output TypeTwo opto-isolated relay
Isolation1500V Opto-isolated
Relay Contact ModeN/O when switching condition is false
Closed when switching condition is true
Alarm FunctionsThe two relays can be configured to operate when:
• A specified volume is measured
• A signal error condition occurs
• A predefined minimum or MAXimum flow rate is exceeded
• Manual alarm test
Supply VoltageMains input voltage range: 86 to 264Vac
Mains Input Frequency47Hz to 63Hz
Power Consumption10.5W
Alternative Input Supply24Vac / dc 1A max.

 Note: Specifications are subject to change without notice