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Flow Clamp-on Type Ultrasonic FlowmeterUL350



*Specifications are subject to change without prior notice.

Our clamp-on type Ultrasonic Flowmeter UL350 has enabled applications to piping in various kinds by enhancing the permeation property of ultrasonic wave.
“Time-Flight” type flowmeter is capable of measuring a flow rate of metallic and plastic piping ranging from 25 to 1000 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 UL350 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.
  • · Capable of controlling the flow rate with digital data by RS-485 serial output. (Forward/backward flow rate output, totalizing output, and status output by the Modbus protocol)
  • · A multi-drop connecting method has greatly reduced the signal wire.
  • · Complied with RoHS. Applying for EMC standards.

Short Specifications

Measuring method Ultrasonic time-flight type
(Ultrasonic path:Reflex mode / V path or Diagonal mode / Z path)
Measuring fluid Whole fluids, but excluding liquids containing high viscosity fluid, a lot of bubbles, and slurry
Measurable fluid sonic velocity range: 1,000 to 2,500m/s
Measurable fluid kinematic viscosity range: 0.3 to 40.0mm²/s
Fluid temperature Up to 90°C (Surface temperature of piping)
Measurable flow
velocity range
0 to 10 m/s
Flow range Max.: 0 to 28100 m³/h (size 1000A)
Min.: 0 to 0.684 m³/h (size 25A)
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
Metal tube and resin tube (Carbon steel, stainless steel, PP, PVC, PVDF etc.)
Measurable pipe
(Nominal diameter)
25mm to 1000mm
1) Analog output: 
4 to 20 mA DC
2) Pulse output: 
Open collector output
3) Status output: 
Open collector output
Status 1: Hold output
Status 2: Empty pipe detection
Status 3: Forward or backward flow detection
4) Serial output: 
RS-485 serial output, Modbus protocol
Display 16-digit, 2-line alphanumeric LCD (with backlight) and status display LEDs (3 pieces)
Display data: Flow rate, totalizing flow rate, various status
Setting Parameter & Low cutoff
Other additional
1) Analog and pulse simulation output function (For loop check)
2) Forward/backward direction measuring function
Power supply 100 to 230 V AC 50/60Hz ( 85 to 264 V AC 50/60Hz is acceptable)
Power consumption: 12 VA or less
Converter mounting
Mounted onto the wall or 2 inch pipe
Protection class Converter / IP65 Jet-proof,
Sensor / IP65 Jet-proof (guaranteed with BNC connectors coupled)
Sensor signal cable Standard 10 m (Up to 60 m)