Foss Soxtec 2050 Manual Del Usuario página 57

Soxtec™ 2050 Automatic System
11.7.7 Resetting the Over-tem-
perature Protection
1. Wait until the temperature of the plate is be-
low the over-temperature limit.
2. Turn the power off.
3. Turn the power on.
4. Turn the overtemperature key to unlocked.
5. Turn the overtemperature key to locked
11.7.8 Manual Temperature on
Hot Plate
You can check the temperature on the hot plate by
doing as follows:
1. Loose the three nuts under the front with help
of a socket wrench size 7 (M4).
2. Take away the plate that covers the hot plate.
3. Measure in the hole close to the center in the
hot plate. You can use a thermometer PT100.
11.7.9 Solvent Recovery, Remov-
al of Thimbles and Extrac-
tion Cups
1. During RECOVERY the valves are closed
and the condensed solvent is transferred to the
collection vessel. The air pump is started au-
tomatically when the countdown reaches the
last three minutes of the recovery step to
evaporate the last traces of solvent left in the
cups. If you want to use the pump for a longer
time (more than three minutes), you must start
it manually. This may be necessary for high-
boiling solvents like Toluene or Xylene.
2. When the program is completed the system
stops in position 3, with cups and condensers
mated. To release the cups, first press the 9
key and wait for the Extraction Unit to go to
position 2, loading/unloading cups. Take out
the cups using the cup holder. Take out the
thimbles using the thimble support holder.
Bend the thimble support holder and remove
the thimbles from the magnets.
If another extraction is to be performed immedi-
ately, load a new batch of thimbles and cups and
press the 6 key.
Note: If diethyl ether is to be used,
check the recovered solvent for per-
oxides before using it again.
11.7.10 Drying Step - Continue
Heating
It is possible to let the controller maintain the tem-
perature of the hot plate for up to 59 minutes after
the recovery step is finished.
When setting up the program set the fourth step
on the controller to a desired value from 0 to 59
minutes.
11.7.11 The Buzzer Signal
The signal sounds continuously after step 3. To
deactivate the signal you must press the set key 4
and turn on the power switch at the same time on
the Control Unit.
Reactivate the signal by repeating the procedure
above.
User Manual 1000 7414 / Rev. 4
11.8 Emptying the Collection
Vessel - Changing Sol-
vent
A solvent level indicator is located on the right
side of the instrument. Empty the vessel at least at
the end of the day and of course when the indica-
tor shows full. Use the emptying tube and the
valve on the right side of the instrument. See Fig.
5:15 and Fig. 5:16.
11.8.1 Emptying the Collection
Vessel
Procedure:
1. Mount the emptying tube onto the valve
opening on the front of the Extraction Unit.
2. Place the tube in the vessel for recovered sol-
vent, if possible lowering the tube into the
solvent. See Warning.
3. Open the valve carefully and wait until the
solvent stops dripping.
4. Close the valve.
Warning
Non-polar materials such as hydrocar-
bon solvents accumulate static charg-
es readily as they have high insulating
values and do not allow the charge to
leak away. The distance between the
opening of the Teflon tube used to
empty the collection vessel (maximum
length 500 mm, I.D. 8 mm) and the
flask in which the solvent is collected
should therefore be as short as possi-
ble. The preferred technique is to low-
er the tube close to the bottom of the
flask and into the solvent to equalize
charges. Avoid free-falling solvent, as
this may be dangerous.
11.8.2 Changing Solvent
Instructions:
1. First empty the collection vessel as described.
2. Run the system without samples and with a
small amount (10-20 ml) of new solvent in the
cups. Run a short program at the recommend-
ed temperature with the sample positioning
rods in the rinse position for 10 minutes fol-
lowed by recovery for 15 minutes.
3. Take out the cups and empty the vessel once
more.
4. Discard the recovered solvent, as it will be
contaminated by the solvent previously used.
5. Repeat if you find it necessary.
Warning
Always be careful when changing sol-
vent. You should for example check
the ignition temperature of the new
solvent used and make sure that the
temperature of the hot plate does not
exceed the ignition temperature.
11:5