I've had great luck with the Supelco gas purifier:
High Capacity Gas Purifier
AC input 110 V, fitting size 1/8 in.
Lasts a long time and much cheaper than the cartridge type units. -Jay
On 6/8/11 8:05 PM, "Shuangquan Zhang" <[log in to unmask]> wrote:
>I am looking for the information on the purifier to work best for the He
>line for an IRMS. Any information would be greatly appreciated.