How To Vent (Shut Down) the GC/MSD - EI - OpenLab CDS

Answer

This Information Applies To: Agilent GC/MSD systems

Issue

Instructions on how to vent the Single Quad GC/MSD instrument using OpenLab CDS software.

Background

If the GC/MSD is running and under vacuum, then the analyzer needs to be vented before opening for maintenance, or to shut down the instrument for a long time.

Steps to Follow

1. In the Home tab, click the Method button, then from the left pane, click MSD > Maintenance and then click the Request tune control icon (Figure 1, step 1)
2. Under the Maintenance submenu, click Vent/Pump Down, then click the Vent button to begin the process. Follow the instructions presented on the screen, and wait until the vent cycle is completed. (Figure 1, steps 2 and 3)

   
   
   Figure 1. Venting your GC/MS using OpenLab CDS software
   1. Request tune control icon, 2. Vent/Pump Down, 3. Vent button
   
   

3. Close shutoff valves to hydrogen sources that enter the analyzer if the instrument is so equipped.

    

   Caution: If hydrogen is used as a carrier gas or JetClean system supply, the carrier and JetClean system supply shutoff valves must be closed before turning off the MSD power. If the foreline pump is off, hydrogen will accumulate in the MSD and an explosion may occur. Read Agilent GC/MS Hydrogen Safety before operating the MSD with hydrogen gas

    

4. Turn off the MSD by pressing the power switch.
5. Unplug the MSD power chord.
6. Turn the vent valve counterclockwise only 3/4 turns or until you hear the hissing sound of air flowing into the analyzer chamber. Do not turn the valve too far, or the O-ring may fall out of its groove. (Figure 2)

   
   
   Figure 2. Opening the vent valve
   
   

   
   

   Caution: Ensure that the GC oven and the GC/MSD interface are cool before turning off carrier gas flow to prevent damage to the column.

7. Turn off the GC and close all the other gas sources.

Learn how to effectively operate your Agilent GC/MSD with OpenLab CDS: Agilent 5977 GC/MSD with OpenLab CDS e-learning course available from Agilent education.