11 Configuration
180 Operation Manual
• The MS becomes ready again.
• You manually clear the MS Vent state.
During the venting process the MS will notify the GC that venting is complete. The GC will then
set very low flows at each flow- or pressure-controlled device leading back through the column
configuration chain to the inlet. For example, for a configuration that uses a purged union at
the transfer line, the GC will set the pressure at the purged union to 1.0 psi, and the pressure at
the inlet to 1.25 psi.
If using hydrogen carrier gas, the GC will simply turn the gas off to prevent hydrogen
accumulation in the MS.
Note that while in the MS Vent state, the GC will not go into MS Shutdown after losing
communications with the MS.
MS Shutdown events
When configured with an MS or MSD that supports enhanced GC-MS communications, the
following events will cause an MS Shutdown in the GC:
• Loss of communications with the MS, when not venting the MS. (Requires no
communications for a length of time.)
• MS reports a high vacuum pump failure.
When the GC enters an MS shutdown:
• The GC aborts any current run.
• The oven is set to 50 °C. When it reaches that setpoint, it turns off.
• The MS transfer line temperature is turned off.
• If using a flammable carrier gas, the gas is turned off after the oven cools (for the MS
column flow path only).
• If not using a flammable carrier gas, the GC will set very low flows at each flow- or
pressure-controlled device leading back through the column configuration chain to the
inlet. For example, for a configuration that uses a purged union at the transfer line, the GC
will set the pressure at the purged union to 1.0 psi, and the pressure at the inlet to 1.25 psi.
• The GC displays the error state and notes the events in the logs.
The GC will not be usable until the error state is cleared or until the MS is unconfigured from
the GC. See “To use the GC when the MS is shut down”.
If the MS is repaired or clears its error, or if communications are restored, the GC will
automatically clear this error state.
GC Pressure Shutdown events
If the GC goes into a pressure shutdown for the carrier gas going to the MS transfer line, the
MS will log this event. As part of the shutdown steps, the GC will also turn off the MS transfer
line. (See the GC Troubleshooting manual for more information about GC shutdown behaviors.
To Set Up a Vent Method
A good MS Vent method does the following:
• Turns off the MS transfer line heater.
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