Detectors 5
Advanced User Guide 87
Temperature programming
The NPD is flow sensitive. If you are using temperature
programming, in which the column flow resistance changes
with temperature, set up the instrument as follows:
• Set the carrier gas in the Constant flow mode. Set detector
makeup gas to Constant makeup.
• If you choose to work in the constant pressure mode, the
makeup gas should be set in the Column +makeup=constant
mode.
NPD required gas purity
Because of its high sensitivity, the NPD requires very pure (at
least 99.9995%) gases. We strongly recommend that moisture
and organics traps be used on the carrier gas and all detector
Flow, mL/min
Flow, mL/min
Pressure (psig)
(kPa)
Pressure (psig)
(kPa)
50
100
150
5
4
3
2
1
Air
Helium
Nitrogen
Hydrogen
10
69
20
138
30
207
40
276
50
345
60
414
70
483
20
138
16
110
12
83
8
55
4
28
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