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headspace-sampling-device

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@kitilikisinguh

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KiCad projectAll 73 files, ready to open in KiCad648 KB
For fabricationGerbers, drill, pick-and-place and BOMGerbers and drill zip114 KBGerbers and drill zip: Heating Element69 KBGerbers and drill zip: PWM Control Circuit66 KBPick and place (CSV)2.3 KBPick and place (CSV): Heating Element1.5 KBPick and place (CSV): PWM Control Circuit1.6 KBBOM CSV12 KB
Schematic PDFEvery sheet, to read or print131 KB
3D modelThe board with its parts, for an enclosure (GLB)3D model (GLB)3.9 MB3D model (GLB): Heating Element1.3 MB3D model (GLB): PWM Control Circuit1.3 MB
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README

Heater Control System

Headspace Sampling Device

Automatic headspace sampling is a technique used to analyze the volatile organic compounds (VOCs) present in a liquid or solid phase sample. This method utilizes heat to separate lighter, volatile compounds from a heavier matrix. Designed as a low cost and efficient solution, this project aims to provide an automated headspace sampler for use in the mass spectrometry department. It employes a closed loop microcontroller system to precisely heat a sample vial to a specific temperature using a PID controller to maintain the temperature withing a 0.1° C error margin. Once the analyte reaches equilibrium in the gas phase, it is directed to a mass spectrometer via an arrangement piping an air pump and solenoid valve. A graphical user interface (GUI) integrates these components, providing cohesive control and monitoring of the process.

Headspace Sampler Operation

This video demonstrates the proper operation of the headspace sampling device.

Vial Agitation

This video shows the correct technique for vial agitation during the sampling process.

WebServer

Temperature Graph and Setpoint.

Control Circuits

Interposer Board for ESP32 Controller

Features:

  • ESP32 microcontroller interface
  • Signal conditioning
  • I/O protection

Heater Control PCB (KiCad Design)

Specifications:

  • Input: 24V DC
  • Input: 5V PWM
  • Output: 24V PWM
  • Max current: 5A

PWM Control for Inductive Loads

Specifications:

  • Input: 24V DC
  • Input: 5V PWM
  • Output: 12V PWM
  • Max current: 5A

File Structure

  • Fixture design files are found in 3D components folder.
  • Firmware to upload to ESP32 as well as other relevant programs are found in the Code folder.
  • Final Year Report, Poster and Videos are found in the Documents folder.
  • Heater-Control-PCB folder conatins KiCad design files for the Heater Control PCB as well as gerber files for production.
  • Interposer folder contains KiCad design files for the ESP32 interpose board and gerber files for production.
  • PWM Control Folder contains KiCad design files for the PWM Controller boards for inductive loads.
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