Fid And Npd Jets - HP 5890 Series II Plus Reference Manual

Detector Systems

FID and NPD jets

Supply pressure for capillary makeup gas should be set to about 276 kPa
(40 psi).
FID and NPD jets
Depending upon the column type to be used, and/or analyses to be
performed, exchanging the jet in an FID or NPD may be necessary. Table
7•1lists available jets.
Note: If switching from packed column operation to capillary operation,
the jet for capillary use must be installed prior to column installation.
Table 7-1. Available FID / NPD Jets
Part No.
18789-80070
18710-20119
19244-80560
* Measured at the jet tip.
For an FID, the 0.011•inchjet maximizes detector sensitivity and must
be used with capillary columns; if used with packed columns, flame•out
and clogging problems may occur.
For an NPD, exchanging jets is less critical to detector sensitivity: the
0.011•or 0.018•inchjet may be used with either packed or capillary
columns. The 0.011•inchjet must be used with capillary columns.
In packed column applications, the 0.011•inchjet may be tried first. The
0.018•inchjet may then be exchanged if problems are encountered. See
Chapter 8, Preventive Maintenance, for specific details regarding jet
exchange.
Jet Tip ID (inch)*
0.030
0.018
0.011
Use
Packed Column Only
(FID only: Simulated Distillation,
TCD-to-FIS series operation.)
Packed Column (Standard, FID and NPD)
Capillary Column (FID and NPD)
(FID: high sensitivity, packed column)
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