USUBinghamResearch
From EditThis.info
Current revision as of 16:52, 18 December 2024
Cleaning Canisters Standard Operating Procedure By Seth Lyman and others Last modified 8 May 2020
1. Preparing the System and Starting the Cleaning
1. Take off old label on cans you will clean and hook them up in the oven.
2. After they are all hooked in tightly, open the valves on the cans.
3. For cleaning flow controllers and timers, cap one end and hook up the other end in the oven. For the timers, hit enter, then manual so that they are open. Also, turn the oven down to 30 degrees C.
4. Make sure the 3100 USB cable is plugged in.
5. Check the water level on the back of the 3100.(Make sure the water is close to the "Water Fill Line"- if it isn't, fill to the line with dH2O)
6. Turn on roughing pump (Small blue pump beneath the table).
7. Turn the power on to the Model 3100A Canister Cleaner(molecular drag pump controller) (The white tower to the left of the double-doored oven).
8. On the Model 3100A Canister Cleaner-Flip and hold the "start" switch on the front panel until the yellow light turns on. The green light will turn on when the drag pump speeds up to 27000 rpm.
9. Make sure the Nitrogen cylinder is open and it is at 400 psi or greater.
10. Open the "Shortcut to "Entech Network Control" icon on the desktop.
11. Open the 5 hr can clean for canisters
12. Press "View". This will open up a "3000/3100 Run Control Screen". (Make sure the oven is up to the appropriate temperature before starting a run).
13. Check for leaks by turning on the rough pump until it is below 2.2 psi. Once it is below 2.2 psia, turn on the H.V. pump until the pressure is below 30mtorr. If the pressure will not fall below 100mtorr, there is likely a leak. Check all of the canister connections forleaks before proceeding.
14. select "All off" to turn off the rough pump and H.V. pump.
15. Turn on the oven and set the temperature to what is specified by the method (30 C for plastic boxes, 80 C for cans and metal flow controllers).
16. Push "Go" in the newly opened window.
17. System is running, check in 7-8 hours to see if cans are done cleaning.
2. After the Cleaning is Complete
1. After the cleaning is complete, check to make sure the Remaining time is -1 AND the Vacuum(mtorr) is <20.
2. When the above step is complete, the cans are finished. turn off the oven heat and open the doors to cool it.
3. Close valves on cans
4. Push stop on the GUI.
5. Remove cans, cap cans, and cap the manifold where the cans were.
6. Check the gauge on each of the clean cans, to confirm they are between -24 and -30 psi.
7. Use lab tape to put a label on each can indicating date of cleaning and your initials.
3. If One of the Clean Cans Needs to Be Analyzed as a Blank Check
For every fifth batch of cans analyzed on the GC/GC/MS system, the can with highest concentration needs to be cleaned, diluted to 15 psia, and then analyzed on the GC/GC/MS system as a blank check. If one of these cans is in your batch, it should be labeled as such. Make sure to dilute it and put it on the rack to be cleaned.
4. Shutting Off the Cleaning System
1. Flip and hold the stop switch on the Model 3100A white tower until the green light turns off.(This allows the machine to slow down so you can turn it off).
2. After the whining sound from the Model 3100A goes away, turn it off
3. Turn off rough pump under the table.
5. Notes About Cleaning the Little Beige Automatic Flow Controllers
I believe we should do the plastic case flow controllers at 30 degrees C. At 40, one of the touch displays seemed a little warped and unresponsive. This went away after it had cooled down and becoming fully functional. Also, we may just want to do a flush for these (like we do on the metal ones) instead of the whole vacuuming down, flush/fill to 20 psi then holding. The metal flow controller/regulator say to flush for 1-2 minutes at ambient operating temperatures.
Method File: MetalFlowControllerClean.M30 was created to follow the prescribed cleaning in the manual. This method has the roughing pump come on until 3 psi, then the hi-vac is skipped, and diluent flow starts for 1 minute. The pressure regulation for this can be done at the cylinder regulator. We will want about 20 psi. There are 3 1-minute cycles/flushes. Oven temp should be set to 60 C.
Method File: PlasticFlowControllerClean.M30 same as above, recently changed to best reflect how to clean them. Oven temp should be set to 30 C and flow controllers should all be open. Loosely cap the end of the flow controller with a plug.
