Bibby Scientific Merit Water Still W4000 Mode D'emploi page 5

After operation of either of the thermostats, normal operation may
be resumed by resetting the thermostats by means of their respective
reset buttons mounted on the end of the heater end cover.
remove the black plastic cover and then press the 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 cut-out
operation identified and rectified.
If the thermostats continue to operate consult a qualified electrician
or the Service Department of Bibby Scientific Ltd.
Care and maintenance
Note: Before commencing any maintenance, cleaning or fault
finding the equipment should be isolated from the mains
electricity supply. These operations should be only 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.
Maintenance
Due to the nature of these parts it is necessary to periodically check
the quality of the plastic connectors and hoses. There should be no
strain on the connectors or hoses. Both the hoses and connectors
should be intact without any cracking. If any damage is discovered
on these parts the Still should immediately be turned off, as detailed
under the "operation" section of this manual, and not used again
before these parts are replaced. Please refer to the "List of spare
parts" section of this manual for order codes.
Cleaning
over a period of operation scale deposits will build up inside the
boiler. To obtain optimum performance from the still, the scale
should be removed on a regular basis.
The time span between cleaning depends greatly on the hardness of
the water supply 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.
Note: Heavy scaling will reduce distilled water quality and can
shorten the life of the heating element.
It is possible to descale the Merit 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 1 litre of 10% formic acid solution or kettle descaler.
Do not use strong acids such as hydrochloric, this can cause
severe corrosion of the metal heating element.
WARNING!
ALWAYS HANDLE 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 when the level in the boiler is
slightly below the overflow.
6. Leave the acid in the boiler to desolve 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 Merit 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.
List of spare parts
The following components are available from most laboratory
suppliers. In case of difficulty, please contact Bibby Scientific Ltd.
Boiler
Condenser
Heater (complete with thermostats) 240V
(complete with thermostats) 220V
Set of heater fixings (flange, gasket, insert and bolts)
Hose kit
Warranty
Bibby Scientific Ltd warrants this instrument to be free from defects
in material and workmanship, when used under normal laboratory
conditions, for a period of three (3) years. In the event of a justified
claim Bibby Scientific will replace any defective component or replace
the unit free of charge.
This warranty does NoT apply if damage is caused by fire, accident,
misuse, neglect, incorrect adjustment or repair, damage caused by
incorrect installation, adaptation, modification, fitting of non
approved parts or repair by unauthorised personnel.
This Warranty does not include the heater element which is only
guaranteed for up to 1000 hours in use.
Cat. No.
W4000/B
WC48/M2
A6/6
A6/6/Euro
W4000/GK
W4000/HK
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