Quote:
Originally Posted by MrBasse
If you are going to argue this then I would say that the inspectors better stop doing it on our robot for inspection while our students are watching. It sets a bad example and gives kids the idea it is an okay method to reach that ever elusive 120 PSI we are allowed.
It wouldn't be too hard to rig a switch that looked official for an inspector to use that gives better control and a more professional appearance over stabbing a screwdriver in there to short the leads.
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The intent of the shorting of the pressure switch by inspectors is to verify the pressure relief valve is set at 120 psi at the event. While I don't endorse teams using a screwdriver to jump the pressure switch, the inspectors are watching the pressure to confirm the relief valve opens at 120 PSI. If the team fails this test, the inspector instructs the team to properly calibrate their relief valve.
I find it important for students and teams to understand that a failed or shorted pressure switch can happen. The inspector testing the circuit by shorting the switch is a valid and important part of the inspection. It is important for teams to understand the failsafes in place in a pneumatic system to reduce the risk of a catastrophic failure.
If it means anything, I never used a screwdriver to short the switch. I always carried a set of alligator clip jumper wires for this since I felt it looked more professional. I also explained to the team why I was testing their pneumatic system and what the ramifications of a failed switch and improperly set pressure relief valve were. The inspector isn't someone charged with failing a team due to mysterious reasoning outside of the watchful eye of the team. The inspector is also responsible for helping teams learn and understand to keep everyone safe.