
9.8.8
System settings - Tubing and Delay volumes
The table below describes the system settings related to tubing and delay volumes, available for ÄKTA
pure.
Description
Instruction name
The instruction is used in calculations of pre-column pressure
when Column valve V9-C or V9H-C (5-columns) is not mounted
onto the system. In such cases, there is no pre-column pressure
sensor present. The estimated pre-column pressure is either cal-
culated by using the measured system pressure and the length
of the tubing between the system pressure sensor and the column
valve or by using the measured sample pressure and the length
of the tubing between the sample pressure sensor and the column
valve depending on the position of the injection valve.
Tubing: Injection valve to col-
umn
The instruction is available only when Column valve V9-C or V9H-
C (5-columns) is not selected in the component list.
The instruction is used in calculations of pre-column pressure
when Column valve V9-C or V9H-C (5-columns) is not mounted
onto the system. In such cases, there is no pre-column pressure
sensor present. The estimated pre-column pressure is either cal-
culated by using the measured system pressure and the length
of the tubing between the system pressure sensor and the column
valve or by using the measured sample pressure and the length
of the tubing between the sample pressure sensor and the column
valve depending on the position of the injection valve.
Tubing: Sample pump to injec-
tion valve
The instruction is available only when Column valve V9-C or V9H-
C (5-columns) is not selected and a sample pump (S9 or S9H) is
selected in the component list.
Delay volume: pH valve is used to calculate the delay volume
between the monitor and the Outlet valve. The instruction is used
to make sure that the collected fractions correspond to the frac-
tions indicated in the chromatogram. It is recommended not to
alter the default values for restrictor and pH cell delay volumes
when standard modules and standard tubing for flow restrictor
are used.
Delay volume: pH valve
Delay volume: Monitor to outlet valve is used to define the delay
volume between the monitor and the Outlet valve. The instruction
is used to make sure that the collected fractions correspond to
the fractions indicated in the chromatogram. The delay volume
must be changed when changing tubing to another I.D. or length
or when removing or adding components.
Delay volume: Monitor to outlet
valve
460
ÄKTA pure User Manual 29119969 AB
9 Reference information
9.8 System settings
9.8.8 System settings - Tubing and Delay volumes
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