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Mass Spec Auto Sampler. Seth Yellin Kyle Sala Stephen Pearson Jake Ahrens. Recap of Project. Mass Spectrometer Autosampler Switched from needle puncture to direct tubing connection due to excessive costs and flow rate issues

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mass spec auto sampler

Mass Spec Auto Sampler

Seth Yellin

Kyle Sala

Stephen Pearson

Jake Ahrens

recap of project
Recap of Project
  • Mass Spectrometer Autosampler
  • Switched from needle puncture to direct tubing connection due to excessive costs and flow rate issues
  • Changed from heating plate to incubator, per MassSpec Research Group’s request
valving system
Valving System
  • Operated and tested Solenoid Valves
  • Solenoids can overheat when operating current is too high (opening vs operating)
  • Power MOSFET (with extra components) design to reduce current through valves during extended use
    • CoolCube (“Hit and Hold”)
    • Diodes (Back EMF prevention)
  • This design was too costly(1 CoolCube = $40)
quad high side driver
Quad High Side Driver
  • Four independent outputs
  • Current reduction once switch is open (“sleep mode”)
  • Overheat shutoff
  • Designed for solenoids
  • Waiting for shipment…
coding progress
Coding Progress
  • Developed pseudo code for all operations of valving system
    • Sampling, Flushing, CO2 Removal, Air replacement
  • Using two independent microcontrollers
  • Extending pseudo code to control new chip
  • Fisher Isotemp Incubator Senior Model

(inside dimensions: 15”x 18” x 17”)

  • Maintain

temperature at 37

degrees Celsius

  • Fit with magnetic

stirrer and nine bottles

  • Feed tube and power

cords inside and out

via air duct on top

  • Valves and tubing

positioned and

fastened on the top shelf

magnetic stirrer
Magnetic Stirrer
  • Digital Multi-Position Stirrer, 9 positions, 230V 50/60Hz
  • Speed range 60 to 1400 rpm
  • Overall dimensions: 17” x 11” x 4”
  • Glass filled nylon top plate that

is chemical resistant

  • Stirring function, with

continuous duty motor and

magnet, maintains set speed

even under changing load or viscosity