Agilent Technologies SD-1 User Manual page 44

4
Using the SD-1 Solvent Delivery Module
Operation
Setting the Maximum Pressure
In the Agilent SD-1, the maximum pressure control can be programmed to
either stop the pump or limit the flow when the set pressure is reached. The
minimum pressure below which the pump will stop can also be programmed.
To set the maximum and minimum pressure:
1 Press the PRESS key.
2 Press the RIGHT or LEFT ARROW to move the cursor on the MAX P field.
3 Set an appropriate maximum pressure for your HPLC column using the
4 To move the cursor to the ACTION field, press the RIGHT ARROW key.
5 To select the action required ( limit or stop), press the DOWN ARROW key.
For Good Laboratory Practices (GLP) and gradient operation it is recommended to use stop
N O T E
for the maximum pressure action. A stop signal from the maximum pressure action will
stop the run and the pressure limit situation will be recorded. If limit were used for the
maximum pressure action, the run would continue with no recorded warning for the limit
action. Composition would be unreliable in this situation.
6 To move the cursor to the MIN P field, press the RIGHT ARROW key.
7 Press the DOWN ARROW key, to set the minimum pressure to a value below
44
Figure 21 Pressure display
numeric entry keys and the ENTER key. If you make a mistake or want to
change maximum pressure, simply re-enter the correct value.
When using very high flow rates (greater than 75 % of the head size) with
the 200 , 500 and 800 mL/min liquid heads, the maximum pressure will be
limited (see "Maximum Pressure versus Flow"
in this window too high, an alert message will display the maximum
pressure available with the flow rate set.
Selecting stop will stop the module. Limit will automatically reduce the flow
from the set level to prevent the pressure limit from being exceeded.
which you want the pumps to stop.
on page 54). If you set MAX P
SD-1 Solvent Delivery - User Manual