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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
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 new instrument is presented to measure the oil concentration in MWFs:
The instrument is filled with the sample under test concentration in MWFs:
The ball is allowed to fall under its gravity
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
The oil concentration is calculated from the measured falling time
Measures carried out at temperature of 25 °C concentration in MWFs:
The ball falling time is function of both oil concentration and temperature
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
MWFs prepared with different oil products are characterized by different calibration equations
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.