Agilent Technologies 6890 Series User Manual

Messages Part 2. Shutdown messages
250
Shutdown 17—Can’t reach setpoint of multipos valve
The valve is switching to the wrong position or is unable to switch to the setpoint
position. The valve will shut down. Clear the shutdown by entering a new
setpoint. Possible causes include:
• The valve position is incorrect. A setpoint was entered that the valve is
unable to reach. For example, position ten was entered for an eight-port
valve. Enter a correct valve position setpoint.
• The Invert BCD setpoint is incorrect. With most valves, the invert should be
On. If the BCD setpoint is already On and you experience a shutdown, set it
to Off.
Shutdown 18—Front inlet cryo shutdown
Shutdown 19—Back inlet cryo shutdown
The inlet is shut down. A cryogenic shutdown conserves liquid coolant when
the GC is unable to start a run. A cryo shutdown does not mean that the cryogenic
cooling system is malfunctioning. Instead, one of the following could be the
cause:
• A “cryo timeout” has occurred. This happens if the GC inlet has reached its
temperature setpoint but the amount of time you specified for the cryo time-
out setpoint has elapsed without a run beginning.
Turn the inlet off and then on again or change the setpoint to restore normal
operation. Then turn the timeout option off to prevent another shutdown or
lengthen the timeout period.
• A “cryo fault” has occurred. Cryogenic cooling has been on for over 16
minutes but the inlet has not reached its temperature setpoint.
Check the level of the cryogenic fluid and replace the supply if it is too low
for proper cooling. The cryo valve may be stuck open or closed. If your fluid
supply is adequate, the valve may be broken or the electronics driving it may
be malfunctioning (this is a less likely cause). Contact your Agilent service
representative.

Agilent Technologies 6890 Series Specifications

General

Brand	Agilent Technologies
Model	6890 Series
Category	Laboratory Equipment
Language	English