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Flow Clamp-on Type Ultrasonic FlowmeterUL330



*Specifications are subject to change without prior notice.

Our clamp-on type Ultrasonic Flowmeter UL330 is “Time-Flight” type flowmeter and capable of measuring a flow rate of metallic and plastic piping ranging from 25 to 400 mm in nominal diameter.
A detector (an ultrasonic sensor) is mounted outside an existing piping by clamping method, so that it does not get into contact with the measuring fluid at all, and there are no concerns about the mixture of solid material and metallic ion into the fluid, the corrosion of sensor by chemical, and the pressure loss by installing the flowmeter.


  • · The sensor of ultrasonic flowmeter UL330 is clamped on just outside of an existing pipe without any piping modification and time consuming installation work.
  • · By adopting a DSP and an AD converters, the flow measurement has been speeded up, and the resistance to bubbles has been improved.
  • · Because of the noncontact measurement method, the formation of bubbles and the mixture of metallic ion have been completely prevented.
  • · Installing the flowmeter does not cause the pressure loss because of no obstacles in the measuring pipe.
  • · The ultrasonic flowmeter is not affected by the pressure or conductivity of fluids.
  • · Excellent in long-term stability because of no moving part.
  • · Providing the following functions: Forward/backward flow rate display, totalizing display, analog output, pulse output, status output.

Short Specifications

Measuring method Ultrasonic time-flight method, Clamp-on type
Measuring fluid Water and other liquids
Except liquid containing high viscosity fluid, a lot of bubbles and slurries.
Flow velocity 1,000 to 2,500 m/s
Fluid kinetic viscosity 0.30 to 40.00 mm²/s
Flow range Max. 0 to 4,442 m³/h (Max. flow at Dia. 400 mm)
Min. 0 to 0.684 m³/h (Min. flow at Dia. 25 mm)
Fluid temperature Up to 90°C (Surface temperature of piping)
Accuracy ±2% of reading (Flow velocity ≥ 1 m/s, Reynolds number ≥ 10,000)
Flow velocity error: ±2 cm/s (Flow velocity<1 m/s)
Measurable piping material Metal tube and resin tube (Carbon steel, stainless steel, PP, PVC, PVDF etc.)
Measurable nominal
piping dia.
25A to 400A
Sensor installation Reflection type (V method) or penetration type (Z method)
Output Current output: 4 to 20 mA DC (Load resistance: 500Ω or less)
Pulse output: Open collector
Status output: Load rating 30VDC, 50mA, Low level 2V or less
・Status 1: Hold output
・Status 2: Empty pipe detection
・Status 3: Forward or backward flow detection
Display 16 letters 2 lines LCD display (with backlight), and 3 LEDs for status indication
Contents: Flow rate, total flow volume, various kinds of status, and flow direction
Low cutoff setting 0 to 30% of the maximum flow rate
(Settable in increments of 1%)
Other additional functions 1) Analog and pulse simulation output function (For loop check)
2) Forward/backward direction measuring function
Power supply 100 to 240VAC 50/60Hz ( 85 to 264VAC 50/60Hz is acceptable)
Power consumption 12 VA or less
Converter mounting method Mounted onto the wall or 2 inch pipe
Protection class Converter: IP 65 Jet-proof, Sensor: IP 65 Jet-proof
Sensor signal cable Standard 10 m (Up to 60 m)