Pump and Flow Control
Determining Pressure and Pressure Limits

Pressure

The operating pressure can only be determined for gas chromatographs. It depends on the layout of the control panel which type of control is used to set the pressure.

• Determine the pressure via the corresponding slider or type the value in the input field.

For other devices, such as Dionex IC and HPLC pumps, the current operating pressure can be displayed on a control panel.

Pressure Limits

Some device drivers provide the possibility to determine the upper and lower pressure limits.

• Type the corresponding value in the input field.

Or

• Position the slider for the upper and lower pressure limits with the mouse pointer. Assign different colors to the controlling sliders so that they indicate whether a pressure limit is exceeded or whether it is within the selected limits (see How to: Controlling Devices from the Control Panel  Modifying a Control).

If defined Pressure Limits, for example, of an HPLC pump, are exceeded, Chromeleon automatically turns off the flow, issues an error message, and stops the sample batch, as necessary. In addition, all operations are logged in the Audit Trail.

It is also possible to determine the pressure limits by entering the following commands in the Program:

where X refers to the name of the instrument defined in the Server Configuration. The pressure unit depends on the pump type.