Replacement of dosing tappet ONLY
We recommend that you completely remove and ser-
vice the liquid injection valve when you replace the
dosing tappet. If you nevertheless only wish to replace
the tappet, proceed as follows:
n
Execute steps as described for removal of liquid in-
jection valve.
n
Move valve to filling position. To do this, set the
front connection of the control cylinder under pres-
sure.
n
Loosen the two clamping screws with which the
control cylinder (1) is secured on the valve body.
Lift off the control cylinder.
n
Pull out the control piston (2) with the injection tap-
pet (22) to the rear by hand. Do not insert any aids
such as a screwdriver into the gap between the piston
and the valve body. This would damage the valve
body and control piston.
n
Detension the plate springs if the dosing tappet can
only be removed with difficulty and also if the tappet
is to be probably removed for longer than half an
hour. This prevents the Teflon gaskets from being
deformed. To do this, loosen the valve body from the
pressure screw with flange by two revolutions.
n
Completely replace the piston with injection tappet
and guide pin.
NOTE:
We recommend that you always have a piston with fitted tap-
pet and guide pin as a spare part in stock.
Replacing heating cartridge, tempera-
ture sensor, temperature limiter
The heating cartridge, Pt100 temperature sensor and the
sensor of the safety temperature limiter (with certified
PFDV) are inserted into the heating plate. The parts can
be replaced if faulty. The heating plate must first be dis-
mounted. If the faulty heating cartridge is stuck in the
heating plate, the latter must be replaced.
Removal of heating plate
n
Remove the liquid injection valve as described
above.
n
Remove the cover plate on which the valve was
mounted.
n
Remove the insulation. The heating plate is then vis-
ible.
n
Unscrew the heating plate.
n
Disconnect the heater and temperature sensor from
the terminals in the shaft.
n
For the certified version: loosen the Pg screwed
gland of the protective tube, and unscrew the tube.
n
Loosen the securing screws for the heating cartridge
and temperature sensor, and pull out the assemblies
from the heating plate.
n
Replace the faulty parts, and tighten the securing
screws again.
Fitting of heating plate
n
Cover the top oven wall well with insulating mate-
rial.
n
Position the heating plate with ceramic insulators,
and screw tight.
n
For the certified version: route the lines for the heat-
ing cartridge and temperature sensor through the
protective tube to the terminals in the shaft. Screw
the protective tube onto the heating plate.
n
Cover the heating plate well with insulating material
and screw on the cover above it.
n
Connect the heater and Pt100 temperature sensor to
the terminals in the shaft. Refer to the circuit dia-
gram for the terminal assignments.
IMPORTANT: Explosion protection
With the certified version, you must have the
correct assembly the of the heating plate ap-
proved by an expert (Elex V 9) before you
can use the chromatograph again.
Register8.vp Stand: 20.11.2000 2-IX
Liquid injection valve
Heater plate of certified FDV
91 Heater cartridge
92 Pt 100 temperature sensor
93 Safety temperature limiter
94 Capillary tube temperature sensor of limiter
95 Protective tube
95
92
91
93
94
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