All protective caps used on AMPTEK and similar solid state sensors MUST be ventilated. An unventilated cap tends to draw a vacuum if removed quickly, putting stress on the sensor's thin beryllium window.
See pictures of some Red Caps that I make and use. The Red Cap is first punched with the vent hole,? 1/8" is ideal. Notice one cap has a really large hole punched in it. As it is, it can provide some protection to the sensor, but when paired with a special Kapton Tape accessory, it is very much more protective- see the Kapton discs, themselves punched with a 1/8" central vent hole.
FYI I have one complete ready to use GEO-1-2-3 left for sale.
