Selecting The Correct Mmi Liner - Agilent Technologies 7890 Series Advanced Operation Manual

3
Inlets
Table 10 Approximate minimum viable inlet pressures for MMI 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 MMI liner

Table 11 Split mode liners
Liner
58
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 body and between the outside of the liner
and the inside of the inlet 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
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) —
Table 11.
Mode Deactivated
Split – Fast Yes
Injection
Split – Fast No
Injection
Split – Manual No
Only
Split – Manual No
Only
Advanced Operation Manual
400–600
6.0 (41.4)
11.0 (75.4)
—
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Part Number
5183-4647
19251-60540
18740-80190
18740-60840