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The Automatic Filter Analysis System of JOMESA:
Cleanliness Analysis, Measurement Process, The patented Metal-Nonmetal recognition, Evaluation Samples, Oil Cleanliness

JOMESA HFD: Cleanliness Specifications

Advanced technical products in automotive, aircraft and medical industries require clean components. Cleanliness is measured by analyzing filter membranes which contain the residual dirt of washed components.

Industrials standards like VDA Vol. 19 and ISO 16232 are the frameworks for cleanliness analysis.

Automated particle counting and analyzing by microscope started around the year 2000 and is now the major method for filter analysis
In Europe in 2012 approx. 1000 installations of cleanliness analyzing microscopes were installed, 32 laboratories are executing cleanliness analysis, including microscopic particle counting as service providers

What are the reasons for this boost ?

Smaller tolerances make systems more sensitive to dirt

Cleanliness and system life times are correlated

Large residue particles (killer particles) may cause function loss

Exhaust is correlated with smooth (unscratched) surfaces

Noise is correlated with smooth (unscratched) surfaces

Recycle laws demand lead free products (less dirt tolerant)

Blocking of Bearings

Blocking of valves

Blocking of nozzles

Short circuit

Crankshaft Bearing, Turbocharger, Piston

ABS, Hydraulics, ..

Injectors, Fuel system


Examples from the JOMESA showroom:

Critical regions of motor blocks: piston areas, oil pressurized area. Here a massive 12 cylinder engine block where only very small dirt tolerance is demanded due to high power output.

Scratches in the piston areas reduce fuel consumption efficiency and increase exhaust of oil and carbohydrates.

Crankshafts -even as tiny as in a one piston chainsaw- are a critical component concerning dirt.

Bearings (between crankshaft and motor block) must be lead free in modern cars because of recycling requirements.

Lead free bearings and shells are harder and cannot embed dirt particles. Thus they are much less tolerant against dirt particles

All parts in the oil wetted or oil pressurized area like camshafts, cogs, chains..

Especially when parts connect big forces and high velocities, dirt particles are not allowed. They can lead to a failure of the system (worst case), but noise, livetime and smooth running are also effected.

All springs, screws in any oil area of a powertrain contribute to the residual dirt sum.
By specifying the particle count per area (per 1000 cm²), the correct proportional contribution is evaluated.

Very residual dirt critical, being one of the first areas demanding particle size analysis:
Fuel injection components. High pressurized Diesel rails, injections valves. These parts are extremely sensitive to dirt. Specifications frequently require no residue dirt particle larger than 200 µm or even smaller.

With rpm in the thousands every tiny particle can cause big damage

Highly residual dirt critical and beeing one of the first area demanding particle size analysis:
ABS/ESB components. Tiny tolerances and high pressures in the pressure controlling block components lead to stringent dirt specifications

Power steering systems work with high pressure and small valve openings. They are all dirt sensitive.

When the cleanliness of these parts is to be evaluated, the parts have to be washed somehow (Rinsing, Ultrasonic).
After this, the washing liquid will contain all residual particles. This liquid is filtered and the resulting filter is analyzed.'
The steps in analyzing the filter membrane are described in our next explanation page: Measurement Process