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A portable electronic system for in-situ measurement of oil concentration i... PowerPoint PPT Presentation


The presentation shows an automatic instrument that measures viscosity (exploiting the falling ball principle) to estimate the oil concentration in cutting fluidsIf you want to know more 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.http://www.sciencedirect.com/science/article/pii/S0924424716301054

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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

  • automated system based on the μ-controller STM32F103R6

  • 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

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

Measures carried out at temperature of 25 °C


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

The ball falling time is function of both oil concentration and temperature


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

For a given concentration it is

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

MWFs prepared with different oil products are characterized by different calibration equations


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

IF YOU WANT TO KNOW MORE AND 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.


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