156 User Information
Maintaining the Instrument
Zone Calibration
Use Zone Calibration to create a custom temperature offset. In
most cases a custom offset is not needed. However, a custom
offset may be useful in the following situations:
• The laboratory has an ambient temperature outside of the
Headspace Sampler’s recommended operating temperatures.
• The method requires using the Headspace Sampler’s
maximum or minimum temperature settings.
• A particular sample matrix and equilibration time requires
greater accuracy for oven temperature and/or loop
temperature.
The calibration process may take days to complete. Once
completed, the custom offsets are stored in memory on the
main processor PCA. If this PCA fails, the custom offset cannot
be restored. Do the following as a precaution:
• Keep a copy of the temperature readings taken during
calibration so they can be re-entered in the event of a failed
main processor PCA.
• Have an Agilent service representative backup the custom
setting data with the diagnostic utility.
Print Table 20 and use it to record zone calibration data.
Tabl e 20 Zone calibration data
Setpoint for oven Oven measurement Setpoint for Loop Loop measurement
50 °C 65 °C
80 °C 95 °C
110 °C 125 °C
140 °C 165 °C
170 °C 185 °C
200 °C 215 °C
230 °C 245 °C
230 °C 245 °C
medium_standard.book Page 156 Tuesday, February 17, 2004 10:14 AM
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