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Yea I'd just take it to airgas and say your bottle is empty and you need to swap it out.  The only issue you may have is if the tank needs to be inspected. Look at your tank and there should be a 5 or 6 digit number the first number or two will be the month it was made and the second will be the year ie. 51997. usually before that number will be a + or a "star. + means it's good for 5 years from that date and "star" means 10 years from that date.  I've seen tanks with a couple +'s or stars.  Just add them together.  +62010 would be good till the 6th month of 2015. Make sense?