3 Installation and Use
Shut Down Procedure
Agilent 990 Micro GC User Manual 41
Shut Down Procedure
The detector can be damaged by improper shut down. If shutting down the instrument for more
than a few days, carry out the procedure below.
1 Create a method for all channels with these settings:
• Filaments switched OFF.
• Column temperature set at 30 °C.
• Injector temperature set at 30 °C.
• Pressure set at 50 kPa.
2 Apply the method to the Micro GC.
3 Wait until the temperature of the columns and injectors are < 40 °C (to protect the column),
then switch off the Micro GC.
4 Remove the carrier gas tubing and plug all the vents and carrier gas connections with 1/8-inch
brass nuts or plastic caps.
Before using the instrument again, perform the “Long Storage Recovery Procedure” described
below.
Long Storage Recovery Procedure
Follow this recovery procedure if your Micro GC has been stored for a long period of time.
1 Remove the 1/8-inch brass nuts and plastic caps from all of the vents and carrier gas
connections.
2 Connect the carrier gas tubing and apply pressure to the Micro GC. Refer to the Site
Preparation Guide for supply pressures and other gas requirements.
3 Wait at least 10 minutes before switching ON the Micro GC.
4 Immediately check if the detector filaments are switched OFF. Switch OFF if necessary.
5 Set Injector temperature to 80 °C when conditioning the column.
6 Condition the GC column, preferably overnight. This will ensure that all the water has been
removed from the column module, and no damage will occur to the TCD filaments. For more
information, see Column conditioning on page 73.
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