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Magnetic Suspension Balance Control System for High and Low Temperature Measurements

This system utilizes magnetic suspension to measure and control sample temperatures ranging from up to 500°C to below room temperature. It includes a PID controller, thermocouples, pressure transducers, gas inlet, sorption equipment, and a vacuum pump for precise measurements and analysis in various applications, including determining sorption isotherms and kinetics. Example applications include thermogravimetric analysis of polymers and studying water loss during the heating of materials like Hyflon-Ion. The system operates by modulating voltage on an electromagnet to hold the suspension magnet in a vertical position, ensuring accurate temperature control and measurements.

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Magnetic Suspension Balance Control System for High and Low Temperature Measurements

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  1. Electromagnet Permanent magnet Δζzp Δζmp Measuring load decoupling Sensor core Sample Measuring-point position Zero-point position Magnetic Suspension Balance - Layout Magnetic system

  2. Magnetic Suspension Balance Position control system Control system Set-point controller PID controller Position trasducer PID Modulates voltage on electromagnet to held the suspension magnet in vertical position

  3. Magnetic Suspension Balance Temperature control system High temperature control: Up to 500 °C Set point Sample temperature Set point resistance Resistance value Cascade control Thermocouple value

  4. Magnetic Suspension Balance Temperature control system • Low temperature control: • Below Room temperature • Up to 100°C Jacket

  5. Sorption equipment Gas inlet : H2 CO N2 burner Gas chromatograph Vacuum pump 8 Thermocouple 9 Pressure transducer ( 150 bar) 10 Pressure transducer ( 1000 mbar)

  6. Example of Sorption Isotherm • PDMS-CO2 at 35°C Kinetics of Sorption Sorption Isotherm Legend: Exp. Data Fick law

  7. Other applications: Thermogravimetric analysis of polymers Study of water loss during the heating of Hyflon-Ion in hydrated state 5 Membrane fully hydrated 30°C 4 3 Weigth loss (%) molH2O/molSO3H 2 Heating 1 Evacuation at 30°C 0 Evacuation at 120°C Time (h) Temperature (°C) Legend: Desorption 30°C Heating up to 120°C

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