We had a FACS 440 for about ten years and would use (our lab doesn't have house air) about a tank of nitrogen every several months or so. Now with our Vantage we seem to be using a tank every couple of weeks - without any increase in hours the flow cytometer is in operation. Does anyone with a Vantage have to use nitrogen (or air) in tanks? If so, please tell me how often you have to change them for approx how much daily usage? Thanks. Ray Hester Univ of South Alabama
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