I have a chamber that houses a getter pump and nothing else.
The chamber is closed with a gate valve and a pinch-off tube.
I plan to pump it down, activate the getter, seal the gate valve, and then look for leaks using an RGA.
When satisfied, I'll close the pinch-off, and the whole assembly (which is now not monitorable) will have to live for a year or two before being launched into orbit.
At a later time, the gate valve will open.
I need to be certain that the getter does not saturate during the years of storage.
I don't have a way to monitor the pressure after I pinch-off, which is a big headache for me.