Thermo Scientific Dionex UltiMate 3000 Series, Operating Instructions Manual

Page: 221 / 270

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Operating Instructions Page 213
7.12 Column Switching Valve
The column compartment can be equipped with one or two column switching valves
( → page 19).
To ensure optimum operation of the valve, observe the following guidelines:
• To prolong the life cycle of the valves, avoid moving the valves dry.
• Maintenance requirements are kept to a minimum. In most instances, it will be sufficient
to clean the valve by flushing all lines with an appropriate solvent. The nature of the
solvent to be used depends on the samples and the mobile phases that are used.
Use a common solvent, such as methanol or acetonitrile, or an 80:20 mixture of methanol
or acetonitrile and water.
7.12.1 Replacing the Column Switching Valve
Description Part No.
2-position, 6-port switching valve* 6041.0004
2-position, 10-port switching valve 6041.0001
* Both valves are suitable for pressures < 86 MPa (12500 psi).
1. Do not touch any metal or plastic parts inside the column chamber while the
temperature is higher than 50 °C. Before carrying out any work in the column
compartment, wait for the column chamber to cool down.
To shorten the cool-down time, consider setting a lower temperature and opening the
front panel door.
2. Pull the column switching valves toward the front. To do so, turn the lever for the
actuators to the right and pull it toward the front as far as it goes out ( → Fig. 35,
page 78).
3. Grasp the valve that you want to replace and pull out firmly to remove the valve from
the actuator.
4. Install the replacement valve as described in section 4.6.1, step 3 and following steps
( → page 78).
5. When the valve is replaced, the rotor seal is also replaced. Therefore, in Chromeleon,
update the service information for the rotor seal. Perform the LeftRotorSealChanged
command or
RightRotorSealChanged
command as appropriate.