Did altitude just blow out 2 MPS's?, Put the in my checked baggage...now won't hold vac. Options

[FlacaProductions]

Brought two of my 3 MPS back to L.A. from Indiana while I await the arrival of my LCR55A so that I could do some bench plotting and tuning only to find that neither one of the now holds any sort of a vacuum.

Both ran fine in the car before flight - just needed some adjustment. One has the factory plug replaced with a Tangerine model - the other is still factory sealed.

Did being in the unpressurized cargo area in my checked baggage blow them both?

That would really stink....

Brian

[emerygt350]

The whole thing is a sealed area. Two forms of movement, expansion and contraction of the diaphragm itself, and the vacuum driven movement of the whole thing.

[ChrisFoley]

The whole thing is a sealed area. Two forms of movement, expansion and contraction of the diaphragm itself, and the vacuum driven movement of the whole thing.

Both sides are open to atmosphere when it isn't connected.
The diaphragm doesn't either expand or contract. It simply flexes.
Once the diaphragm is against the part load stop, it doesn't move any further. All the additional movement comes from the aneroid cell expanding.