You can swap out cylinders to do it, but that means a lot more tubing, etc. to purge when you want to run. With the EPC unit, you would simply load the appropriate method to use it and the switch is done at the instrument. Much less tubing to purge and quicker to have the system ready to run when you need it.
We have 13 GCs on 5-17 mL total flow when idle and they work just fine for environmental samples and surge events the CDC sends us. 552.3 instrument probably has 3500 injections with no maintenance and a 17 month old curve. Some mass specs with a concentrator for 524 or TO-15 will see water climb in sleep mode but it all blows out after the tune is off. If there is column damage it's still cheaper to toss a new one in than foot the helium bill in my opinion, I haven't seen abnormal wear yet 9 months in. Our CDC unit has been running like this for years.
We are glad this was helpful! We are sorry this was not helpful. If you still need assistance please create a community post or contact support. To help us improve, please provide any additional feedback.
For full details of how we will treat your information, please view our privacy policy.
