Agilent Technologies 1200 Series User Manual page 24

2 Getting started
Setup pump
1 Mode
• Micro Mode
• Normal Mode
24
The nano pump can be set in 2 modes:
• The micro flow mode
• The normal flow mode
In micro flow mode, the primary flow produced by the two
pumping units is proportioned in the EMPV. The remaining
column flow is measured in the flow sensor. The measured
flow is compared with the user-entered column flow
setpoint. The flow sensor controls the EMPV current,
causing the EMPV to correctly proportion the column flow.
The primary flow in excess of the required column flow
volume is directed to the waste.
In normal mode, the EMPV is completely closed to the
waste and the flow sensor measures not the flow. The
complete primary flow produced by the two pumping units
goes to the column and is not proportioned in the EMPV.
Micro flow mode
µ
From 0.1 to 1
Normal flow mode
From 0.00 to 2500
1200 Series Nano Pump User Manual
l/min.
µ
l/min.