Fpd + Optical Filters; Inlet Liners For Use With The Fpd; Fpd + Temperature Considerations - Agilent Technologies 7820A Advanced User's Manual

5
Detectors
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FPD

Inlet liners for use with the FPD

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FPD
98
on. A brief exposure (always with the PMT voltage turned off)
will not damage it but prolonged exposure will cause a gradual
loss of sensitivity.
optical filters
The filters are marked on the edge with the transmission
wavelength. Each filter has a small arrow or triangle on its side
which must point toward the PMT when installed.
The sulfur filter is silvery on both sides and transmits at
393 nanometers.
The phosphorus filter is yellow/green and transmits at
525 nanometers.
Compounds containing sulfur may adsorb on an inlet liner and
degrade the GC's performance. Use deactivated, clean liners or
a cool on-column inlet, which injects directly onto the column.
For best results with splitless injection, use liner 5181-3316.
temperature considerations
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The FPD
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.
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provides two temperatures zones, one for the transfer
Advanced User Guide