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Best method for sleep mode

Trice

We recently purchased a new GC that has the ability for sleep mode. None of us here are experts on "putting the GC to sleep". We recently ran out of air (no big deal) since the last person in on Friday (shared equipment) didn't turn the flame off. Here were the options we were toying with:

Create a sleep method to turn off the flame and stop the flow of all gases (sleep method Friday eve, wake mode Monday a.m.)

Turn off the flame and let one of the gases flow over the column  (sleep method Friday eve, wake mode Monday a.m.)

Put a standby method at the end of each persons run that shuts off the flame (wear and tear on the ignitor?)

Other thoughts?

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  • 0

    Hi Trice, 

    I'm not sure if this method would work for you but this is what our lab has been doing for a decade for our 25 GC's.  

    Below is a macro that we have run automatically with every instrument.  It checks a counter every 2 minutes and if the counter exceeds 105 minutes it loads a standby.m method.  It's worked well for us over the years with Chemstation B.01.01 thru OpenLab C.01.10.

    NAME STANDBYCHECK
    Logging 7, "C:\CHEM32\CORE\" + _INSTNAME$ + "-DEBUG.LOG"
    setverbose 3
    COUNTER = TIME()

    IF _OFFLINE = 0 THEN
    WHILE 1=1 !---STAY IN LOOP FOREVER
    IF _methfile$ <> "STANDBY.M" THEN
    IF _RUNIDLEMANAGER = 1 THEN !---_RUNIDLEMANAGER IS 1 when idle

    If (TIME() - COUNTER) > 6300 !---IDLE FOR 105 MINUTES
    _METHODCHANGED = 0 !---so it wont ask to save changes
    LoadMethod _methpath$,"STANDBY.M"
    COUNTER = TIME() !----Reset counter when standby method gets loaded
    ENDIF
    ELSE
    COUNTER = TIME() !----RESET TIMER
    ENDIF
    ELSE
    COUNTER = TIME()
    ENDIF

    SLEEP 120 !---WAIT 120 SECONDS
    ENDWHILE
    ENDIF

    ENDMACRO

    _ABORT$="CpRequest STANDBYCHECKCP, STANDBYCHECK"
    CpStart STANDBYCHECKCP !----INITIATE SEPERATE PROCESS
    CpRequest STANDBYCHECKCP, "STANDBYCHECK" !----RUN MACRO IN SEPERATE PROCESS

  • 0 in reply to hebgent

    If it's just over the weekend, I would turn the flame off but keep some flow through the columns.  Best to keep the inlet at a minimum of 5 psig and 20 mL/min flow.  There are some suggestions in the 8890 Operation manual also: Operation Manual (agilent.com)

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