Ex version: cleaning the quartz disk,
combustion chamber, reflector
Remove top part as described under Replacement of
interference filter or photomultiplier
Remove center part and push out quartz disk from
below
Wipe quartz disk using a damp cloth. Use alcohol if
necessary. CAUTION: do not scratch the quartz
disk!
Replace the quartz disk if it is dull. Take care with
the graphite gaskets
Unscrew the cable inlet and remove the ignition
cable. Clean the insulating shaft
Wipe the inside of the center part and the reflector
of the bottom part using a damp cloth
Adjust the ignition electrode on the side above the
combustion chamber. The spark path should be ap-
prox. 5 mm long.
Reassemble detector and start up. Check the dark
current, basic current and sensitivity.
1 Bottom part 10 Exhaust gas connection
2 Center part 11 Socket
3 Top part 12 Heat sink
4 Quartz disk 13 Column inlet
5 Interference filter 14 Burner nozzle
6 Cable inlet 15 Anti-rotation element
7 Photomultiplier 16 Pressure screw
8 Combustion air restrictor 17 Ignition electrode
9 Combustion gas restrictor
Ex version:
replacement of quartz nozzle
The top and center parts should be removed in order to
check correct installation.
Unscrew column
Completely remove anti-rotation element (15a)
Unscrew the column connection from the bottom
part (13)
Remove pressure screw (16) (hexagon socket
SW 4)
Pull out burner nozzle 20from the oven chamber
and pull off the graphite gasket
Burn out a new quartz nozzle in a flame
Slide the graphite gasket onto the quartz nozzle
Introduce the quartz nozzle into the bottom part and
adjust: the tip of the nozzle must end 1 mm below
the annular gap.
Screw the column connector (13) tight. Make sure
that the nozzle is no longer moved.
Screw in the anti-rotation element (15a)
Start up the detector and check the dark current,
basic current and sensitivity. If the dark current is
correct but the basic current is too high, the nozzle
has been inserted too high and glows.
Ex version: replacing the heater
cartridge and temperature sensor
This is described for all heating elements in a separate
section in this register.
1 mm
7
15
8
1
10
14
2
9
12
4
3
5
13
6
11
16
17
15a
FPD - flame photometric detector
EXFPD.CHP Stand September 14, 1999 4 - 29
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