Gas sensitivity Measurement System

I designed and fabricated a cost-effective gas sensitivity measurement apparatus for material characterization and sensor studies. The system integrates precise gas control, sample heating, and real-time measurement within a compact setup.

Key Features:
Variable gas concentration control (0.1 vol.% to 3 vol.%)
Sample heating from room temperature up to 350 °C
Dual stainless-steel electrical contact points for measurements
Chamber designed for both atmospheric and vacuum operation

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​System Components:
Input & Gas Admitting Section: Gas concentration is adjusted through push-button keys, with admission controlled by a motorized syringe and three-way valves, enabling highly precise dosing.
Control Section: A microcontroller-based unit calculates inputs and controls syringe movement, stepper motor rotation, and valve switching for accurate gas delivery.
Sample Heating Section: Two 50 W heating coils warm an aluminum block substrate holder, achieving uniform heating up to 350 °C.
Temperature Controller: A PID controller ensures accurate temperature regulation.
Gas Chamber: Constructed with an aluminum top and stainless steel base, providing durability and flexibility for experiments under different environments.