8 | Help with faults
BÜCHI Labortechnik AG
60/70
Operation Manual Pure Chromatography Instrument C-805
Error message
Possible cause
Solution
Solvent Pressure:
Pressure limit has
been exceeded.
Blockage in the line
u
Remove column.
u
Replace with bypass.
u
Determine if column is not
the source of blockage.
u
If not column is the source
of blockage, then check all
fluidic lines.
Sample crashing/precipitate
u
Purge lines/system with a
strong or appropriate sol-
vent that will dissolve the
sample
Valve stuck in incorrect posi-
tion
u
Reset valve position.
u
Contact BUCHI Customer
Service.
Error in solvent line
calibration file.
Calibration file of solvent lines
damaged
u
Shutdown the Pure soft-
ware.
u
Delete the calibration list.
u
Restart the Pure software.
Sensor pressure
calibration file
Pressure sensor calibration
file damaged.
u
Shutdown the Pure soft-
ware.
u
Delete the pressure value
list.
u
Restart the Pure software.
Instrument Alarm:
Vapor
Vapor sensor settings are set
too sensitive
u
Change the vapor limits to
a lower sensitivity. See
Chapter 6.2.7 "Editing the
vapor sensor sensitivity",
page 39
Leaks
u
Check for any leaks in the
solvent flow paths.
Solvent vapors in work area
u
Solvent vapors in the work
area may set on the alarm.
Use the instrument in a
hood or well ventilated
area with no open solvents
near the system.
Vapor sensor no
signal
Vapor sensor is not connected
or is defect
u
Check the cable to the va-
por sensor.
Instrument Alarm:
Watchdog
Timing/communication issue
in software
If in setup mode:
u
Restart the instrument.
u
If in run mode:
u
Press reset.
u
Restart after the run is fin-
ish.
