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A portable electronic system for in-situ measurement of oil concentration in metalworking fluids - PowerPoint PPT Presentation


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A portable electronic system for in situ measurement of oil concentration in metalworking fluids

A Portable Electronic System for in-situ Measurements

of Oil Concentration in MetalWorking Fluids

Marco Grossi, Bruno Riccò

Department of Electrical Energy and Information Engineering

University of Bologna, Italy


A portable electronic system for in situ measurement of oil concentration in metalworking fluids

MetalWorking Fluids (MWFs): oil in water emulsions used for machine cooling and lubrication during different finishing processes, because of their good thermal conductivity and lubrication properties.

The oil concentration (in the range 1% to 10%) should be kept (approximately) constant during the MWF’s lifecycle in order to optimize emulsion and machine performance.

The oil concentration should be measured at regular intervals:

Manual titration: reference laboratory method

Refractometer: industry standard


A portable electronic system for in situ measurement of oil concentration in metalworking fluids

A new instrument is presented to measure the oil concentration in MWFs:

  • the method is based on the measure of the sample viscosity

  • the viscosity is measured using the falling ball principle

  • the ball falling time is measured by two proximity sensors

  • a PT100 thermistor is used to compensate viscosity variations due to temperature

  • the instrument is battery-operated for “in-situ” measures


A portable electronic system for in situ measurement of oil concentration in metalworking fluids

  • power supply by four 1.5V AAA alkaline batteries

  • 2x8 monochromatic LCD and four buttons for user interaction

  • low power consumtion: average current drawn 28mA

  • on-board EEPROM to store calibration files for different products


A portable electronic system for in situ measurement of oil concentration in metalworking fluids

The instrument is filled with the sample under test concentration in MWFs:

PT100

The ball is allowed to fall under its gravity

Top proximity

When the ball exits the top-proximity active area the counter is activated

When the ball enters the bottom-proximity active area the counter is deactivated

Bottom proximity

The oil concentration is calculated from the measured falling time




A portable electronic system for in situ measurement of oil concentration in metalworking fluids

For a given concentration it is and temperature

where the parameter b is also function of Coil

an iterative algorithm is used to compensate for temperature variations using the PT100 thermistor



A portable electronic system for in situ measurement of oil concentration in metalworking fluids

IF YOU WANT TO KNOW MORE by different calibration equationsAND SEE A VIDEO OF THE INSTRUMENT PLEASE READ

Marco Grossi, Bruno Riccò. “A portable electronic system for in-situ measurements of oil concentration in MetalWorking fluids”. Sensors and Actuators A: Physical, 243, 2016, 7-14.