Compact Clamp-on Ultrasonic Flow/Heat meter

RBFM-EX3 Compact Clamp-on Ultrasonic Flow/Heat Meter(Clamp-on Micro Flow Sensor) is special design for compact clamp-on small pipe, the pipe range is from DN10 - DN100, it's quick and easy to install, even by non-trained operators,  the clam-shell design of this range makes them a fast and reliable solution for non invasive flow and/or heat measurement applications. As the sensor seperation distance is fixed, there is no need for adjustment and once fitted they are not easily disturbed. It can save much cost for installation. No need for tubes of ultrasonic grease, rulers and marker pens. Clean, hassle-free installation.







  • Principle
  • Features
  • Specification
  • Model Selection
  • Applicants
  • Download

RBFM-EX3 Compact Clamp-on Ultrasonic Flow/Heat Meter Features:

  •  Flow models and Heat Meter versions
  •  24V DC Powered
  •  Pulse Output, 4-20mA Output, Alarm Outputs(optional)
  •  Modbus RS485 Comms
  •  DN10 to DN100 are available
  • No need to cut into the pipe
  • Liquid compatibility or Pressure is not an issue
  • No professional product knowledge required, installation and measurement is quick and easy
  • No moving parts or pressure loss changes involved
  • Installation can be done without systems shut-down or flow interuption
  • Mostly Clean and non-aerated liquids only (See Doppler type if over 10% Solids or entrained air)


RBFM-EX3 Compact Clamp-on Ultrasonic Flow/Heat Meter Specification: 

  • 2 Metre Cable for power & Signals/Data
  • IP54 Rated
  • Rugged Aluminium Construction
  • Velocity 0.1 - 5 m/s
  • Accuracy +/- 2% F.S
  • Pipes: Copper, Plastic, Steel, Iron, Stainless Steel
  • OLED Display with 6 Figure Total and Flow Rate shown
  • Data Storage (Daily, Monthly, Annual Flow Totals)
  • Metric & Imperial Units
  • 24V DC Supply
  • Temperature: 0℃ - 50℃ 
  • 4-20mA Analogue Output (Pulse /Alarm Output Optional on request)
  • RS485 Modbus Output
  • Pre-configured or In-field adjustment possible

Model Selection

RBFM-EX3 Compact Clamp-on Ultrasonic Flow/Heat Meter Model Selection:  

The RBFM-EX3 Compact Clamp-on Transit time Ultrasonic Flow Meter                                   Model Selction
RBFM-EX3 Code Type of Transmitter
  Compact type
R Remote type with 2m cable
  RBEX Type of transducers(Pipe range: DN10-100mm)
10 DN10 φ15 9.50-15.5  
15 DN15 φ20 16.50-23.0
20 DN20 φ25 25.00-28.0
25 DN25 φ32 32.00-35.0
32 DN32 φ40 38.00-45.0
40 DN40 φ50 48.00-54.0
50 DN50 φ63 58.00-64.0
65 DN65 φ75 72.00-78.0
80 DN80 φ90 80.00-92.0
100 DN100 φ110 108.00-116.0
1 OCT,RS485, 4-20mA
2 OCT,RS232/485, 4-20mA,+ Upper or Lower limit Alarm
N 0 - 50℃
H 0 - 150℃(Only for Remote type)
  Power Supply
D 10~36VDC
  Flow/Heat version
H Flow/Heat
Remark: Model selection sample:
1. RBFM-EX3-C-25-1ND Compact Clamp-on ultrasonic flow meter, DN25, OCT,RS485, 4-20mA, fluid temperature:0 - 50℃,10~36VDC

RBFM-EX3 series Compact Clamp-on Ultrasonic Flow/Heat Meter can also meet different liquid measurements, such as acid, chemical solvents, alcohol, beverages, water and other clean liquids.  The RBFM-EX3 series are widely used in medicine, chemical laboratory, food and beverage, database, cleaning machine and other small-diameter liquid measurement environments.


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