6530 QTOF shutdown for long period

Hello, 

The recent shutdown procedure for QTOF systems (other than 6546 model) didn't indicate if collison cell gas need to be turned off.  Does one need to shutoff the collison cell gas for the other models? we have power down our 6530 system but left the collison cell gas ON as is.  Is this ok? Would this harm anything, the electronics in particular? or should we close off the gas tank?  Thank you for any reply.

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