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Impeller Flowmeter

The impeller flowmeter provides a continuous log of vertical fluid velocity within a borehole. Two sizes of high-sensitivity probes satisfy most borehole-size requirements and expected flow rates.

Principle of Measurement:

The probes are equipped with lightweight helical impellers mounted on double sapphire bearings. The impellers contain magnets which actuate Hall-effect switches within the probe to detect impeller rotation. Separate log channels record the time of rotation according to fast and slow timebases for improved resolution at high and low flow rates. Uphole and downhole rotations are distinguished within the sonde.


  • Jewelled bearings for minimum friction
  • Low-drag sensors
  • Choice of head diameters
  • Cable-speed readout


  • Flow
  • Cable velocity



  • Flow measurement within a water well
  • Location of permeable zones
  • Casing leak detection


Diameter: 45mm, 70mm
Weight: 7.3kg
Temperature: 0-70⁰C (extended ranges available)
Max. pressure: 20MPa

Operating Conditions

  • Borehole type: open/cased, water-filled
  • Centralisation: required

Sales Information

I002122 Flowmeter 45mm
I002115 Flowmeter 70mm

Download Impeller Flowmeter sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

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