Smart Leak Detection; Troubleshooting - Knauer Smartline 5000 Serie Handbuch

Never remove the Degasser's cover. There is nothing
inside that requires service or maintenance by the
customer

Smart Leak Detection

An additional benefit of maintaining a constant vacuum level is that a
potential leak in the vacuum degassing system can be observed by
monitoring the RPM of the pump. This "smart leak detection" is a benefit
of the patented design of the degasser. If a leak occurs within the
chamber, the microprocessor will increase the pump RPM in an attempt
to maintain the vacuum level. If the pump cannot maintain the vacuum
level (if it runs at an elevated RPM for more than 30 minutes), the yellow
LED will flash, indicating a possible leak condition, and the system will
shut down and go into a "safe" mode.

Troubleshooting

Table 5 Troubleshooting
Problem
Power switch is on, but all 3 LEDs
are off, indicating no power to the
degasser.
Orange INIT LED is on steadily,
pump is running and RPM seems
high.
Orange INIT LED is flashing
approximately 1 second off, 1
second on. Vacuum pump is not
running.
Orange INIT LED is flashing
approximately 2 seconds off, 1
second on. Vacuum pump is not
running.
Is there a way to check whether
the system is operating correctly
when Power and Vacuum green
LEDs are illuminated, but pump
can't be heard running?
Bubbles appear through the output
tubing.
No solvent flow.
.
Probable Cause
The connection cable (G0649) is
not plugged into the pump and
manager outlet.
Blown fuse.
Pump is in initial pump-down
phase or system's degassing
demand has increased.
Possible system leak.
Possible sensor or control board
fault.
Due to the design of the pump
and degasser, the pump is
virtually silent at low RPM, even
though vacuum is good and
degassing is normal.
Loose fitting(s).
Air in the HPLC pump head.
If a buffer solvent was left in the
degasser for some time after use,
it may clog the degasser
elements.
Solution
Plug the connector cable into the
outlets.
Contact your Service
Representative.
Typically normal operation,
although if pump speed continues
to rise for an extended period of
time (as heard by the pitch of the
stepper motor) it could indicate a
potential fault condition.
Contact your Service
Representative.
Contact your Service
Representative.
Monitor the UV absorbance of
non-degassed methanol at 215
nm versus degassed methanol
coming through the degasser.
Proper performance of the
degasser should decrease the UV
absorbance of the methanol
significantly.
Tighten the input and output
fittings.
Prime/purge the pump head.
Use a different channel, or
connect the channel to a beaker
of the solvent without the buffer.
Draw the solvent through the
channel to dissolve the buffer.
Do not push the solvent through
the channel. If this flushing action
does not work, contact your
Service Representative.
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