3 Basic Operation
3.4
3.
12 FPD-2010
3.4Shield Ring Height Check
The shield ring of FPD is mounted at the nozzle end in order to cut unnecessary noise components.
Basically, the noise components will be cut by setting the shield ring at the upper position. This, at the time,
decreases the signals of the target components. Also, setting the shield ring at the extremely higher or lower
position will bring the hydrogen flame to an unstable condition. Accordingly, to realize stable analysis, it is
necessary to set the shield ring to appropriate height.
The shield ring of FPD differs in height depending on the type of injection port.
Make sure that the shield ring is located at the optimum height following the procedure below.
WARNING
High temperature
You might suffer burns. Be sure to confirm that each part of FPD has cooled
down before starting the following operations.
CAUTION
Be sure to turn OFF the power supply of the Gas Chromatograph main unit
before performing the works.
1.
Before removing the photomultiplier, be sure to turn [Off] the detector control of FPD, and then turn
OFF the power of the unit.
CAUTION
Remove the photomultiplier with the power of the FPD turned OFF.
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