Shutting Down The Module - Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS

5.9 Shutting Down the Module

Observe the following precautions before interrupting the operation or before shipping the
module:
Tip: Observe the information on this in point 3 in section 5.8 (→ page 138) when
resuming module operation.
• For longer periods of inactivity or if saliferous buffers are used, rinse the fluid lines with
MS-grade water. This avoids salt crystallization, which may impair the instrument
performance.
• If operation is interrupted for a longer period, make sure that neither the module nor the
solvent supply lines or solvent reservoirs contain pure water. Use an appropriate additive,
for example, 0.1% formic acid, to prevent the growth of algae.
For longer periods of inactivity (more than one week) or when shipping the module, no
•
water must remain in the fluid passages. This is, for example, to avoid failure of the
sealing surfaces of the column switching valve when the temperature falls below 0 °C.
Rinse out any solvents from the module and fill the pump with methanol or a similar
alcohol, such as isopropanol or ethanol. If the solvents in the pump are not miscible with
water, use an appropriate intermediate solvent.
If a buffer is used as a part of the mobile phase, flush the system with several volumes of
methanol/water (50:50) before it is shut down. This is to prevent salt buildup inside the
unit.
• If pump operation is interrupted for more than 5 days, remove the PharMed tubing from
the peristaltic pump. To remove the tubing, slightly press the lever to the right, remove
the tubing, and release the lever. This will avoid that the tubing remains compressed and
does not relax, thus blocking the wash solution.
• Rinse out buffers or solvents that form peroxides.
• If the pump flow is interrupted for longer periods (> 1 hour), you have to turn off the
lamps in any UV or RF detector connected to the module to prevent evaporation in the
flow cell.
• If you want to ship or move the module to a new location, no liquid must remain in the
waste line of the rear seal wash system.
The waste line is routed on the module bottom to the drain port at the bottom right of the
module. If necessary, lift and tilt the module from the left side of the enclosure and wait
until no more liquid leaves the waste line.
Page 140 Operating Instructions