Dispersancy Tester

Measurement of the Merit of In-Service Engine Oils with Blotter Spot Method


The requirement for on-line machinery and oil condition monitoring is becoming evermore apparent as maintenance costs increase and production capacity and equipment performance are maximized.

One of the primary functions of a lubricant is to preserve the cleanliness of a combustion engine’s mechanical parts. The cleanliness of the mechanical parts is facilitated by “detergency” and “dispersancy” (DD) additives in the engine oil.

The DT100DL operates according to ASTM D7899. The instrument simultaneously measures soot and dispersancy. The results reported are combining soot content and dispersancy performance.



  • Methods
  • Benefits
  • Applications
  • Specifications

ASTM D7899

A dedicated method is under approval process. This test method could be an alternative to very long and expensive test which is the engine test like DV4TD – CEC-L-93-04 where the pistons and rings are rated.

  • Unique and simple instrument to measure dispersancy
  • Dispersancy measurement and soot content quantification
  • Removes all arbitrary aspects of manual method
  • Ideal for trend analysis in OCM programs and diagnosis on diesel engines
  • Oil Conditioning Monitoring (OCM)
  • Oil testing labs
  • Engine test labs
  • Fleet maintenance shops
  • Constructions or Mining sites
  • On-board ship
  • Lubricating Oils plants
  • Synthetic lubricants plants
Technical Points Description
Dispersancy(MD) 100 (good) to 0 (verypoor)
Contamination index(IC) 0.1 to 5%
Combined Performance Rating(DP) 0 (good) to 200 (very poor)
Duration of spot analysis Few seconds per spot
Max spot diameter Up to 45 mm
Positionning of the spot Visual centering with guide
Imaging system color CCD camera
Light source Dual lighting – backlight and front light LED panels
Calibration of imaging system Special calibration tool (delivered with the unit)
Spot image storage Color image in front light and B&W image in backlight