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Over the years ACM have built up a collection of test techniques applicable to standard instruments such as Gill 8/AC, or Field Machine:

  • AC Impedance (EIS) - a series of sine waves from start to finish frequencies. Potential and galvanic response for each wave is stored, from which Z Real, Z Imaginary, Bode Impedance and Bode Theta are calculated.
  • Current & Voltage - continuous measurement of potential and galvanic readings. Maximum read rate is limited by the mains frequency, 50 per second for 50Hz and 60 per second for 60Hz.
  • Cyclic Sweep - sweeps between two potentials over a number of cycles, or half cycles.
  • Harmonic Analysis - extracts first, second and third harmonics and calculates corrosion rate.
  • Potential Measurement & Galvanic Measurement.
  • Potentiostatic - hold offset potential and measure current response.
  • Galvanostatic - maintain offset current and measure potential response.
  • Galvanic Sweep - potential is measured whilst current is swept.
  • Linear Polarisation (LPR) - both sweep & step (more resilient) tests available, results plotted as LPR result vs time or corrosion rate
  • Voltage Input - measure external potentials, thermocouple inputs can be specified.
  • IR Compensation - typically used for measurement of concrete samples or other high impedance samples.
  • Weld Testing - many of the standard techniques can be supplied for weld testers, 5 simultaneous weld measurements.

More exotic, or custom created techniques:

  • L.C.M.TM - Localised Corrosion Monitoring developed by Baker Petrolite.
  • Custom Sweep - finer control of sweeps, pauses and offsets.
  • Multiphase Flow - ACM's own designed technique (Patent No.: GB2365977) for use in multiphase environments.
  • Temperature Measurement - Platinum Resistance Thermometers (PRT) give the highest accuracy measurement.
  • ER - Electrical resistance, precision measurement of ER probes.
  • GPS Positioning - Add-on for field machine to log position, later plotted on a map.
  • Critical Pitting Temperature - Details here.
  • Current Step Polariser - Define precise current steps whilst potential is measured.
  • Heater & Stirrer Control - From within sequencer heaters and stirrers can be controlled.

There are endless options with ACM, we are masters of bespoke system design, always happy to discuss individual requirements.
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