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• When you first put the ACQUITY RDa into Operate mode, for optimum performance,
Waters recommends that you allow the instrument to stabilize for one hour before you
perform a calibration.
• When you are not using the instrument, to conserve energy and reduce nitrogen
consumption, stop the LC flow and put the instrument in Power Save mode.
B.6 Divert valve flow rate considerations
It is important that you use the supplied PEEK tubing to connect your TUV/FLR optical detector to
the divert valve, to prevent damage to the flow cell caused by exceeding its maximum
recommended pressure limit.
The following table lists the maximum recommended cell back pressure levels for system
configurations that include an in-line optical detector.
Table B–1: Divert valve recommended pressures/tubing
In-line optical detector
ACQUITY Premier TUV Detector
ACQUITY Premier eLambda PDA Detector
ACQUITY Premier FLR Detector
Notice:
that you use the recommended tubing size and lengths for your instrument.
Note:
You must position the LC to the left of the ACQUITY RDa, with a distance of 50-100 mm
between the instruments, to allow the red PEEK tubing to reach from the LC to the divert valve.
B.7 Stop flow
When the ACQUITY RDa Detector is switched into Power Save mode, or when a nitrogen gas
failure is detected, the instrument sends a stop-flow signal to the LC. The stop-flow signal
switches off all solvent flow from the LC in order to prevent damage to the ACQUITY RDa
Detector. The message Stop-flow active appears in the ACQUITY Console when the stop-
flow function is active.
To avoid the pressure exceeding the limits of the preceding instrument, ensure
August 20, 2021, 715005003 Ver. 04 (Previously released as Revision C)
Maximum flow cell
back pressure
1000 psi
1000 psi
500 psi
Page 83
Tubing
Red PEEK tubing, up
to 500 mm, 0.005-inch
ID
Red PEEK tubing, up
to 500 mm, 0.005-inch
ID
Red PEEK tubing, up
to 500 mm, 0.005-inch
ID
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