202 Advanced Operation Manual
5 Detectors
FPD
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temperature considerations
The FPD
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provides two temperatures zones, one for the
transfer line (the main detector temperature) and one for
the emission block. For the transfer line temperature, we
recommend a temperature that is 25 °C higher than the
highest column temperature.
The emission block temperature ranges from 125—175 °C.
Typically, the default temperature of 150 °C is sufficient for
most applications. However, when setting the emission block
temperature, consider the following:
• If using the GC oven at high temperature (>325 °C) with
the transfer line set to 400 °C, set the emission block
temperature to 165 °C to avoid a system Not Ready if the
emission block temperature cannot be maintained.
• If using the transfer line at 400 °C, set the emission block
temperature to at least 150 °C to avoid a system Not
Ready.
• For sulfur analyses, the highest area response will be
realized with the lowest possible emission block
temperature.
• For phosphorus analyses, the area response is
independent of the emission block temperature.
FPD
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gas purity
High- purity gases have a lower sulfur content. Standard
purity gases have a higher sulfur content which impairs
sulfur detection in the compound being studied. Instrument
or Chromatographic grades work well.
Agilent recommends using helium carrier, nitrogen makeup
gas, and air with 99.9995% purity or better. Use carbon,
oxygen, and moisture traps. Select traps to remove sulfur
compounds from detector air and nitrogen gases. A helium
getter is also recommended. See the GC, GC/MS, and ALS
Site Preparation Guide for and the Agilent web site at
http://www.agilent.com more information.
FPD
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gas flows
Table 53 gives the flows for the maximum sensitivity FPD
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flame, which is hydrogen- rich and oxygen- poor.
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