Darrell Hanna and Associates, Inc. (DHA)

Particle Analysis



DHA offers hydraulic fluid analysis measuring the amounts and sizes of contaminates to meet the ISO 4406 cleanliness code. This is a 3-part code counting particles at 4um, 6um and 14um. Easy to use particle analysis systems are also offered for sale in permanent mount and portable form. Knowing the cleanliness level of your fluid is the basis for contamination control.


  • On-line, including continuous and automatic features
  • Optional bottler sampler with pump and vacuum degassing
  • Reports data in ISO 446 or NAS 1638 formats
  • Calibrated based on ISO 11171
  • Windows based software
  • Portable and lightweight (15lbs)
  • Optional: SKYDROL unit

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