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Area of Science:

  • Chemistry
  • Engineering
  • Instrumentation

Background:

  • The Schlenk technique is crucial for handling moisture- and air-sensitive chemicals.
  • Commercially available vacuum sensors for Schlenk lines are often expensive and difficult to repair.
  • There is a need for accessible and cost-effective vacuum monitoring solutions.

Purpose of the Study:

  • To present an open-source, low-cost microcontroller-based alternative to commercial vacuum sensors.
  • To provide a reliable method for monitoring pressure during Schlenk technique applications.
  • To enable wider adoption of the Schlenk technique through affordable instrumentation.

Main Methods:

  • Utilized a Pirani-type sensor integrated with a Wheatstone bridge circuit.
  • Employed an operational amplifier (OpAmp) for signal amplification.
  • Implemented a 12-bit analog-to-digital converter (ADC) and an ATtiny84 microcontroller for data processing and control.
  • Integrated a 0.91-inch OLED display for real-time pressure readings.
  • Designed for battery power and optimized for extended operational runtime.

Main Results:

  • Successfully developed a functional microcontroller-based vacuum sensor.
  • The device accurately monitors pressure levels relevant to Schlenk technique.
  • The system demonstrates a low-cost and repairable alternative to commercial sensors.
  • The battery-powered design ensures portability and long operational periods.

Conclusions:

  • The presented open-source vacuum sensor is a viable and economical solution for Schlenk technique applications.
  • This innovation lowers the barrier to entry for researchers requiring inert atmosphere manipulation.
  • The device's design promotes accessibility, repairability, and extended use in laboratory settings.