Thermo Scientific Dionex UltiMate 3000 Series, Operating Instructions Manual

Page: 128 / 270

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 120 Operating Instructions
5.5.5 Setting the Pressure Limits
The pump firmware and Chromeleon provide standard values for the upper and lower
pressure limits. The limits depend on the pump type. You are free to change the limits
within the allowed pressure range.
If the pump pressure is outside the specified limits, the related message appears on the pump
display. If the module is operated from Chromeleon, the message is displayed also in the
Chromeleon Audit Trail. In addition, Chromeleon stops the flow and aborts the batch. Check
the Troubleshooting section for a short description of possible causes along with
recommended courses of action ( → page 145).
• Lower pressure limit
Helps to prevent the pump, and thus the column, from running dry. A typical setting is
1 MPa.
• Upper pressure limit
Helps to protect the column from too high a pressure. The application and column type
determine the setting.
When setting the upper pressure limit for the NC pump, observe the information in
section 5.5.2 ( → page 110).
To set the pressure limits in Chromeleon
A – Pressure range
The range within which the pressure limits can be set and the pressure unit are specified in the
in the Properties dialog for the pump ( → page 48). You can set the upper and lower pressure
limits only within the specified range.
B – To change the pressure limits for a specific application
1. Open the
Commands
dialog box for the pump ( → page 89).
2. Select
Pressure
and enter the new limits under
LowerLimit
and
UpperLimit
.
To set the pressure limits on the pump display
1. Select the Control menu for the pump.
2. Check and change the limits for Max. pressure and Min. pressure if necessary.
You can change the Pressure unit on the Configuration menu. When the module is operated
from Chromeleon, the pressure unit specified in Chromeleon will be used.