I have some rotameters on site and I expected them to show l/h, but after looking at them it says qnl/h. It is simply for setting instrument air for purging purposes, but I'd like to understand how to convert this to l/hour. We might not have the required flow of instrument air but I cannot set anything up until I can convert to what the manual is asking for.
Thanks for any help.
>I have some rotameters on site....
Would you tell us the manufacturer and model number of the rotameters?
Q generally designates "flow rate".
NL is normal Liters, Nl/hr means "normal liters per hour".
It is a volumetric flow rate for air (or gas), but calculated to 'normal' conditions, where Normal conditions are a given temperature and pressure whose values I don't recall off the top of my head.
For a discussion on converting, see this link,