Waters 1500-Series, Operator'S Manual

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Startup and initial preparation 4-7
Degasser operating statuses
The LED on the 1500-series pump front panel indicates the status of the
degasser as described in the table, below.
Compatibility with solvents
The degasser vacuum chamber consists of a tubular membrane that is made of
a proprietary, specially engineered, fluorocarbon polymer for compatibility
with a wide spectrum of liquids, including all mobile phases commonly
encountered in HPLC. See page B-7 and Appendix C for more information
about solvent compatibility.
LED indications
LED state Description
Unlit Pump is powered-off.
Steady yellow Degasser is operating with pump at high RPM,
vacuum level above 60 mmHgA/1.16 psiA. (This
is typically a brief, transitional state during
initial evacuation.)
Steady green Degasser is operating with pump at low RPM,
vacuum level below 60 mmHgA/1.16 psiA,
normal operation.
Green flash, 0.5 seconds
on and 0.5 seconds off
Degasser is operating but vacuum level is
unstable. This condition can also indicate a
sudden change in degasser work load.
Yellow flash, 0.5 seconds
on and 2 seconds off
Degasser is not operating. Degasser toggle
switch is set to Off. Operation should resume
after setting the switch to On.
Yellow flash, 2 seconds on
and 0.5 seconds off
Degasser is not operating. Vacuum signal is out
of usable range, indicating an electronic or
pressure sensor failure.
Yellow flash, 0.5 seconds
on and 0.5 seconds off
Degasser is not operating. Target vacuum level
was not reached within 10 minutes, indicating a
vacuum leak.
Alternating yellow and
green flash
Degasser is not operating. Target vacuum level
was reached but then rose above upper limit,
indicating a vacuum failure.