Agilent Technologies 1100 Series Reference Manual page 28

Optimizing Performance
Operation Modes of the Micro Vacuum Degasser
If the vacuum level of normal operation mode two cannot be achieved within
8 minutes the instrument turns into error mode.
Continuous Mode
The continuous mode is activated either by switching SW1 on the main board
to 1 (removal of cover is required, see "Removing and Refitting the Top
Cover" on page 50, for identifying SW1, see "Overview of Internal Parts" on
page 54), or by connecting pin 1 (white cable) and pin 3 (green cable) of the
auxiliary cable to each other.
When turning on the vacuum degasser the vacuum pump will run
continuously. This will establish a vacuum level that is below the trigger level
(600 mV / 115 Torr) of the normal operation mode 1.
If the vacuum level of normal operation mode 2 cannot be achieved within 8
minutes the instrument turns into error mode.
N O T E
When set to continuous mode the life time of the vacuum pump will be
significantly reduced.
When to use Continuous Mode
In continuous mode the vacuum pump runs continuously thus generating the
highest degassing efficiency of the degasser. This mode is recommended for
very sensitive applications, which shows baseline disturbance due to
ON/OFF switching of the degasser.
Error Mode
The error level for the vacuum degasser is 190 Torr (approximately 800 mV).
This level cannot be achieved when there is a failure in the degasser (for
example, leaks, etc.). When the error level is exceeded the yellow status
indicator lamp is turned on and the vacuum pump runs continuously. If the
degasser cannot reach one of the normal operation modes within 8 minutes
the status indicator turns red and the vacuum pump is turned off.
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