Selecting The Correct S/Sl Inlet Liner - Agilent Technologies 7820A Advanced User's Manual

3
Inlets
Table 3 Approximate minimum viable inlet pressures for split/splitless inlet in split mode, in psi (kPa)
Helium and hydrogen carrier gases
Split liners - 5183-4647, 19251-60540
Splitless liners - 5062-3587, 5181-8818
Nitrogen carrier gas
Split liners - 19251-60540, 5183-4647
Splitless liners - 5062-3587, 5181-8818

Selecting the correct S/SL inlet liner

Table 4 Split mode liners
Liner
32
Split vent flow (mL/min)
50–100
2.5 (17.2)
4.0 (27.6)
3.0 (20.7)
4.0 (27.6)
These numbers are based on the resistance to flow of new, clean
inlet systems. Sample condensation in the split vent tube or a
dirty filter can make these values non-attainable.
Split liner
A good liner for split mode operation will offer very little
restriction to the split flow path between the bottom of the liner
and the inlet gold seal and between the outside of the liner and
the inside of the injection port body. The preferred Agilent split
liner, part number 5183-4647, incorporates a glass positioning
bead on the bottom to facilitate this. It will also incorporate
glass wool or some other source of surface area inside the liner
that provides for complete sample vaporization across the
boiling point range of the sample. Select an appropriate liner
from Table 4.
Description Volume
Low Pressure Drop 870 µL
– Positioning Bead
4mm ID, Glass Wool 990 µL
Empty Pin & Cup 800 µL
Packed Pin & Cup 800 µL
100–200 200–400
3.5 (24.1 4.5 (31)
5.5 (37.9) 8.0 (55.2)
4.0(27.6) —
6.0 (41.4) —
Mode Deactivated
Split – Fast Yes
Injection
Split – Fast No
Injection
Split – Manual No
Only
Split – Manual No
Only
400–600
6.0 (41.4)
11.0 (75.4)
—
—
Part Number
5183-4647
19251-60540
18740-80190
18740-60840
Advanced User Guide