Transit-time Clamp-on Ultrasonic Flowmeter – TUF333


isolvThe measuring principle of ultrasonic flow meter 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 provides accurate measurement of liquid flowing within a closed pipe, without the need for any
    mechanical parts to be inserted through the pipe wall or to protrude into the flow system.
  • 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

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

Technical Details
Measuring Range Two transducer for different pipe diameter OD pipes
‘ A’ transducers - 13mm to 115mm OD pipes
‘ B’ transducers - 50mm to 2000mm OD pipes
‘ D’ transducer - 1500mm to 5000mm OD pipes
(Optional) – Contact Flotech
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
Selectable Flow Units litres, gal, USgals, Barrel, m³
Total volume – 12 Digits - forward and reverse
Flow Velocity Range 0.1 to 20m/sec (bi directional)
Transducer Temperature Range -20°C to +135°C
Transducer Protection Class IP54 (Standard)
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 IP65
Material Flame retardant injection moulded ABS
Dimensions 280mm x 180mm x 120mm
Weight 1.2 kg
Number of Keys 15 key tactile feedback membrane keypad
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 +75°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 opto-isolated relay
Pulse Repetition User programmable from 1 to 250 ppm
Pulse Width User programmable from 2ms to 500ms
Max Current 500mA
Max Voltage 48V
Output Type Two opto-isolated relay
Isolation 1500V Opto-isolated
Relay Contact Mode N/O when switching condition is false
Closed when switching condition is true
Alarm functions The two relays can be configured to operate when:

A predefined MINimum or
MAXimum flow rate is exceeded.

A specified VOLume is measured.

A signal error condition occurs

Manual alarm test.

Supply Voltage Mains input voltage range: 86 to 264Vac
Mains Input Frequency 47Hz to 63Hz
Power Consumption 10.5W
Alternative Input Supply 24Vac / dc 1A max.
Note: Specifications are subject to change without notice

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