Instrument Type:

Pump

Related Commands:

Flow

Description:

Define the pressure limits within which the pump(s) is permitted to operate.

Function:

If one of the limits is exceeded, Chromeleon turns off the flow, displays an error message, and terminates the current sample batch.

If the upper pressure limit is exceeded, the flow is immediately set to 0 ml/min. The pressure reading must remain below the lower pressure limit for some time (typically approximately 60 s - the time depends on the pump type), before Chromeleon turns off the flow.

Parameters:

(The values that can be entered and the pressure unit depend on the pump type.)

Pressure.LowerLimit

Lower pressure limit in Bar, MPa, or psi.

Pressure.UpperLimit

Upper pressure limit in Bar, MPa, or psi.

 Tip:

Pressure limits apply to all pumps that are connected on the high-pressure side.

Exceeding the upper pressure limit can be due to a blocked column or capillary or to a defective injection valve.

If the pressure is below the lower limit, this is usually due to a leak in the fluidic system.