Idiomas disponibles
Idiomas disponibles
11.9 Cleaning of Accessories
11.9.1
Aluminium Cups
The aluminium cups can be cleaned in the dish-
washer provided that the cleaning detergent is
close to neutral pH.
11.9.2
Glass Thimbles
Cleaning of glass thimbles can be done by proce-
dure 1 or 2.
1. Soak with chromic acid * overnight. Wash
with distilled water and dry in an oven at
105°C approx. one hour. Ash at 525 ±15°C
overnight, gradually heated. Let crucible/
thimble cool down in the furnace to about
250°C before placing them in a desiccator to
reach ambient temperature.
*
120 grams Sodium dichromate,
Na
Cr
O
×2H
O
2
2
7
2
1600 ml conc. Sulphuric acid, H
1000 ml distilled water, H
2. Suck hydrochloric acid solution (15-20%)
through the crucible/thimble until no residues
remain. Wash with distilled water and dry in
an oven at 105°C approx., one hour. Ash at
525 ±15°C overnight, gradually heated. Let
crucibles/thimbles cool down in the furnace
to about 250°C before placing them in a des-
iccator to reach ambient temperature.
The crucibles withstand temperatures up to
540°C. However, they must be heated and cooled
according to the following schedule to avoid
breakage or permanent stress. See Fig. 5:17.
11.9.3
Temperature Table
Note: The temperatures listed in the
table below are given for guidance
only; they may have to be adjusted
for factors like room temperature,
water temperature, heat transfer
from hot plate to cup, etc.
A good temp is when the droprate is approx. 3-5
drops per second.
The figures given in the table refer to aluminium
and glass cups. OT (over-temperature) is the safe-
ty at out temperature if the temperature regulation
would fail.
Warning
The overtemperature setting should
always be checked for each solvent
used. Our recommendations are se-
lected according to the ignition point
figure that was available at the time
when this manual was written. To be
sure, you are advised to check the spe-
cific safety data sheet for the solvent
to be used.
11.9.4
Closing Down
1. Switch off the "MAIN" switch.
2. Turn off the cold water tap.
3. Empty the solvent collection vessel.
11:6
Soxtec™ 2050 Automatic System
11.10 Maintenance
Note: The equipment must not be
used if the maintenance instructions
below are not followed.
11.10.1 Daily
Check the glass cups for cracks, especially on the
surface which faces the seal. Check the seals and
replace them if they are cracked or defective in
any way. Check the surface of the hot plate and
remove any residues carefully to avoid bad heat
transfer.
11.10.2 Weekly
Wipe the instrument clean with a damp cloth. It is
important that the cloth is damp to avoid buildup
of static electricity. The hot plate may be cleaned
with an abrasive cloth (e.g. Scotch Brite) to re-
move any residues of dirt and to improve heat
SO
2
4
transfer.
O
2
11.10.3 Monthly/Yearly
Check the coolers for algae growth. If necessary
clean with 1 M HCl or Hypochlorite solution.
Fill the cooling system with 1 M HCl. Let the so-
lution remain in the coolers overnight. Flush with
water. Repeat if necessary.
If the insides of the condensers are contaminated,
it is normally sufficient to make one or two blank
runs without samples. Take a small amount of sol-
vent in each cup and run a short extraction cycle.
Repeat several times if necessary. Start the air
pump and check the air flow in each condenser
holder (teflon part). If the condensers are heavily
contaminated, contact service personnel or follow
the service instructions for changing condensers
and soak the condensers in laboratory glassware
detergent overnight.
Change seals 1-2 times per year.
Note: Remove the cover and check
for leaking tubings and glass details
twice a year.
Note:Service must be done once a
year by an authorized service engi-
neer.
Note: Calibration of the instrument
is not allowed. If necessary contact
the FOSS Analytical AB service de-
partment.
Warning
When cleaning the instrument, espe-
cially the glass parts, always use a
damp cloth to avoid static electricity.
User Manual 1000 7414 / Rev. 4
