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2.
Switch on the heating element. The on/off switch is located on the
front panel - see figure 1.
3.
After a few minutes the water will start to boil and distillate will
emerge from the condenser. With new glassware, or after cleaning,
it is advisable to allow this to run to drain for approximately 30
minutes before beginning collection.
4.
To turn off the still, first turn off the heating element but allow
cooling water to continue for a further 10 minutes to allow the Still
to cool.
WARNING!
Do not use this equipment to distil any liquid other than water.
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.
Boiler thermostat
3.
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 Cole-Parmer.
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 Cole-Parmer 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:
6
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
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.
6.
Ensure the earthed pipe kits are earth bonded to the chassis
using the provided earth bond wires.
Note: Heater element is not covered by the 3 year warranty.
It is only guaranteed for 1 year.
when the level in the boiler is
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