Clamp-on Extended Temperature (C-ET) Range Flow Meter System

Clamp-on Extended Temperature Range Transducer System

The C-ET flow meter system is a solid waveguide, ultrasonic clamp-on flow meter system used for measuring liquid flow in extreme low or high process temperature applications.

Traditional clamp-on flow meters are subject to failure under extended temperatures because the piezoelectric elements become damaged and lose their acoustic properties. The C-ET flow meter system is the second generation to our OKS flow meter system, which overcame this problem by isolating the piezo element of the flow meter at the end of a long buffer rod, keeping the transducer at approximately ambient temperature.

The C-ET flow meter system is made up of a C-RS transducer (in 0.5 or 1.0 MHz frequencies), a waveguide that isolates the flow meter from the extreme process conditions, a C-RS holder that mounts the  flow meter to the wave guide and transfers heat away from the flow meter, a stainless steel clamping fixture, and solid couplant that does not require periodic maintenance.


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  • Measurements at extremely high process temperatures (400°C/752°F) and at extremely low process temperatures (-200°C/-328°F)  
  • Clamp-on installation does not require process shutdown
  • No penetration into the pipe and no risk of leaks
  • No restrictions to cause clogging and no pressure drop 
  • No drifting and no periodic calibration
  • Little to no maintenance
  • Low flow measurement, down to 0.03 m/s (0.1 ft/sec)

C-ET transducer systems are used with clamp-on ultrasonic flow meter installations for:

  • Refinery applications, including coker, crude distillation, vacuum distillation, crackers, hydrotreaters, visbreakers
  • Powerplant applications, including boiler feed
  • Cryogenic applications 

Operation and Performance

Pipe Sizes 80 to 600 mm (3 to 24 in) NB and larger
Pipe Wall Thickness Up to 80 mm (3 in)
Pipe Materials Carbon and stainless steel. Consult GE for other materials.
Flow Accuracy (Velocity)

Pipe ID >150 mm (6 in): ±1% to 2% of reading

Pipe ID <6 in 150 mm (6 in): ±2% to 5% of reading 

Accuracy depends on pipe size and whether measurement is one-path or two-path. Accuracy to ±0.5% of reading may be achievable with process calibration.

Specifications assume a fully developed flow profile (typically 10 diameters upstream and 5 diameters downstream of straight pipe run) and flow velocity greater than 0.3 m/s (1 ft/s).

Temperature Ranges

Process: –200°C to 400°C (–328°F to 752°F)

Ambient: -40°C to 75°C (-40°F to 167°F)   

  • Fixture: stainless steel
  • Waveguide: stainless steel
  • Transducer: stainless steel and plastic
  • Transducer holder: coated aluminum
Certifications (Integral C-RS Transducer)
  • CSA certified (Class 1, Div. 1, Groups B, C and D)
  • ATEX certified (ll 2 GD Eex md llC T6 T=80°C    

Descriptions English
C-ET Installation Guide C-ET Installation Guide
C-ET Transducer System Datasheet C-ET Transducer System Datasheet