Temperature Programming; Jets And Collectors - Agilent Technologies 6890 Series Service Manual

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• Turn the hydrogen flow off during solvent peaks and between runs.

• If your NPD is Off for a long time in a high-humidity environment, water

may accumulate in your detector. To remove it:

a. Set the detector temperature at 100°C and maintain it for 30 minutes.

b. Set the detector temperature to 150°C and maintain it for another

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:

• With an EPC inlet, set the carrier gas in the Constant flow mode. Set

EPC detector makeup gas to Const makeup. NonEPC detectors provide

constant makeup gas flow.

• If you have an EPC inlet and an EPC detector and choose to work in the

constant pressure mode, the makeup gas should be set in the

Col+mkup=const mode.

The capillary optimized NPD is only used with capillary columns. It is shipped

with the standard jet and collector.

Nitrogen Phosphorus Detector (NPD)

Agilent 6890 Gas Chromatograph Service Manual

Recommended settings

6890a 6890 plus