Agilent Technologies 8890 User Manual

5Methods
Operation Manual 107
Column compensation
In temperature programmed analysis, bleed from the column increases as the oven
temperature rises. This causes a rising baseline which makes peak detection and integration
more difficult. Column compensation corrects for this baseline rise.
A column compensation run is made with no sample injected. The GC collects an array of data
points from all 4 detectors, whether installed, off, or working. If a detector is not installed or is
turned off, that part of the array is filled with zeros.
Each array defines a set of curves, one for each detector, that can be subtracted from the real
run to produce a flat baseline. The next figure illustrates the concept.
Relative noise level
Slower data ratesFaster data rates
Excess noise (due to flow,
oven temperature, detector
block temperatures, etc.)
Chromatogram with
rising baseline
Chromatogram with
column compensation
Blank column
compensation
profile

Agilent Technologies 8890 Specifications

General

Brand	Agilent Technologies
Model	8890
Category	Laboratory Equipment
Language	English