Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
Safety cut-outs
The Distinction Water Still is protected by the
following safety cut-outs:
1.
Reservoir level control
This should be positioned in the collecting
reservoir (see "Assembly") and turns off the
heating element when the reservoir is full.
2.
Condenser thermostat
Mounted in the condenser's distillate outlet.
Should the water supply be interrupted
steam will begin to emerge from the
condenser causing the thermostat to operate
and turn off the electricity supply to the
heating element.
3.
Boiler thermostat
Mounted in the boiler above the heating
element. Should the boiler water level fall
and expose the element the thermostat will
operate and turn off the electricity supply to
the element.
After operation of either of the thermostats,
normal operation may be resumed by resetting
the thermostat by means of their respective reset
buttons mounted on the right hand end panel of
the electrical compartment.
remove the black plastic cover and then press the
red button - a slight click will be heard if the
thermostat had operated.
Before resetting either thermostat
the still should be allowed to cool
completely and the cause of the
cut-out operation identified and
rectified.
If the thermostats continue to operate, consult a
qualified electrician or the Technical Service
Department of Bibby Scientific Ltd.
6
Care and maintenance
N.B. Before commencing any maintenance,
cleaning or fault finding the
equipment should be isolated from
the mains electricity supply. These
operations should only be carried out
by suitably qualified personnel.
only spare parts supplied or approved by Bibby
Scientific Ltd or its agent should be used. Fitting
of non-approved parts may affect the
performance or safety of the equipment.
Cleaning
over a period of operation scale will build up
inside the boiler. To obtain optimum
performance this scale should be removed on a
regular basis.
Please note that scale can build up both in
the neck and main body of the boiling
chamber.
The time span between cleaning depends
greatly on the hardness of the water and the
amount of use. Frequently used stills in hard
water areas may need descaling once a week
whereas in a soft water area several weeks may
elapse before descaling is necessary.
N.B. Heavy scaling will reduce distilled
water quality and can shorten the life
of the heating element.
It is possible to descale the Distinction Water Still
without dismantling the glassware by following
these instructions in conjunction with Control of
Substances Hazardous to Health regulations
(CoSHH) 1988:
1.
Switch off the electricity supply to the still
and allow it to cool completely.
2.
Turn off the cooling water supply.
3.
open the stopcock on the constant level
control and allow the boiler to drain
completely. Close stopcock.
4.
Turn on the cooling water supply and allow
the boiler to fill to approximately half way
to its normal operating level. Turn off the
water supply.
5.
Into the open funnel of the constant level
control carefully add about 100ml of 10%
formic acid or kettle descaler.
WARNING!
ALWAYS HANDLE STRONG ACIDS WITH
GREAT CARE. PROTECTIVE CLOTHING,
GLOVES AND FACE-MASKS SHOULD BE
WORN DURING THE DESCALING
OPERATION.
REMOVE ANY ACID SPILLS
IMMEDIATELY.
Turn on the water supply and fill the boiler
to the normal operating level. The water
will flush the acid into the boiler. The water
supply should be turned off
in the boiler is slightly below the
overflow.
6.
Leave the acid in the boiler to dissolve
the scale. This may take some time
depending on the severity of the
build-up.
7.
open the stopcock and allow the boiler
to drain.
Note: If the acid in the boiler has not
been completely neutralised the
liquid flowing to drain may be highly
acidic. All necessary safety
precautions should be observed
around the drain and any effluent
control procedures followed.
8.
Close the stopcock, turn on the water
and allow the boiler to fill with cold
water. Turn off the water, re-open the
stopcock and allow the boiler to drain.
repeat this procedure three times.
9.
The Distinction Water Still may now be
restarted by referring to the instructions
given under "operation" in this manual.
Note: The stand and outer surfaces of
the glassware should be cleaned using a
damp cloth and a mild detergent
solution.
Heater replacement*
1.
Isolate the Still from the electricity supply.
2.
Clean the heater and boiler if they are
heavily scaled by following the cleaning
instructions given in this manual.
3.
It will be found easier to replace the
heater by working with the boiler "on
the bench".
Therefore:
❖ Drain the boiler via the stopcock.
❖ remove the end panel.
❖ Disconnect the heater cable.
❖ Disconnect all water hoses.
❖ remove the condenser.
❖ remove the boiler, complete with
heater, from the stand.
❖ unscrew the 3 bolts securing the
heater and
withdraw the heater from the boiler.
❖ remove the aluminium plate and
silicone rubber
ring from the heater.
4.
Now fit a new heater as described in
assembly instruction number 4.
N.B. Examine the silicone ring and
replace if not in good condition.
5.
re-assemble the Still by following the
assembly instructions.
*Note: Heater is not covered by the 3 year
warranty.
It is only guaranteed for up to 1000 hours in
use.
6.
Ensure the earthed pipe kits are earth
when the level
bonded to the chassis using the provided
earth bond wires.
Publicité
Table des Matières
