Changes

This image from the book "Product Integrity and Reliability in Design" appears to be a schematic of the Model 250.<br />[[File:John W. Evans, Jillian Y. Evans, Dong-su Ryu (auth.), John W. Evans, Jillian Y. Evans (eds.) - Product Integrity and Reliability in Design-Springer-Verlag London (2001).jpg]]<br /><gallery mode="packed">

File:BG Model 250 Side 1.JPG| Valves used to control which acid is drawn in (Nitric or Sulphuric) and pump into chamber where IC is placed. File:BG Model 250 Side 2.JPG| Etcher PCB with relay and components, large cylinder used to raise/lower lid and various valves/pressure sensors. File:BG Model 250 Top Chamber.JPG| Etching chamber, when lid is lowered a seal is formed and the chamber is pressurized with Nitrogen. An error is presented to the user if an adequate seal is not formed. File:BG Model 250 Side 1 Top.JPG| Side/Rear view showing acid valves and chamber. The lid of the chamber lifts and rotates using a groove cut into the shaft. File:BG Model 250 Side 2 Cylinder.JPG| View of the large cylinder used to lift the lid and the pressure valve that feeds Nitrogen in to either lift or lower the lid. File:BG Model 250 Side 2 Valve.JPG| Another view showing the pressure regulators and valve used to control large cylinder. File:BG Model 250 Side 1 Vent Valve.JPG| Pressure relief valve used to release pressure in the chamber. Pressure is vented out to the waste acid capture container. This container must not be sealed unlike the fresh acid containers which are sealed. File:BG Model 250 Side 2 Cylinder Valve.JPG| Close up picture of the valve used to control the large cylinder that lifts/lowers the chamber lid.