PerkinElmer CLARUS 590 GC, Руководство пользователя

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Utilities . 257
Column Flow Calc Main Screen
Length
This field is normally entered in meters (1 to 1000 in 1m increments). The calculator should also support
techniques such as PreVent and heart-cutting etc. and so shorter columns/tubes should be supported. If
the value scrolls below 1m, then the units should change to mm (1 to 1000 in 1mm increments).
The default value will be 30m.
For the calculation this value should be converted to cm.
Diameter
Column diameter should be entered in µm (1 to 1000µm in 1µm increments).
The default will be 320µm.
Value converted to cm for calculations.
Temp
Normal GC oven temperature range in °C (-99 to 450°C in 1°C increments).
The default will be 50°C.
Value converted to °K for calculations.
Carrier Gas Name
The name of the carrier gas is selected in order to apply the correct viscosity coefficients and suggested
column carrier gas velocities as shown in the Table.
Screen Name Gas
ref
η
,Pa.s
x Suggested
Velocity, cm/s
He Helium 0.000018662 0.646 20 to 40
H2 Hydrogen 0.000008399 0.725 30 to 55
N2 Nitrogen 0.000016736 0.680 8 to 16
The default will be “He”.
Outlet Press
The column outlet pressure is set to Ambient or Vacuum (0) or to a user entered Other value. Units will
be in absolute units (psi abs or kPa abs) and will be set according to the units chosen in the Configuration
screens for the rest of the user interaction. The range for this field will be 0 to 100 psi abs in 0.1psi
increments or 0 to 689 kPa abs in 1kPa increments.
The default will be Ambient (14.7psi abs or 101kPa abs).
Suggested Velocity
A display-only field that shows the recommended carrier gas velocity range from the selected carrier gas
name.
Inlet Press
This is a selectable field (this is the default selection) and, if selected, the Flow and Velocity/t0 fields are
deselected and are display only.
The carrier gas input pressure is in units of psig (1 to 100psig in 0.1psi increments) or kPa (1to 689kPa in
1kPa increments).