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6.
From the hose kit take the 225mm length of 8mm
bore plastics hose fitted with screwthread connectors
at either end. Referring to Figure 1, screw one end of
the hose to the upper outlet of the condenser and the
other end to the glass thread on the constant level
control.
7.
Take the 1000mm length of 16mm bor e plastic hose
and carefully connect to the outlet of the constant level
control. For easy connection first warm the hose with
hot water.
Secure with a tie strap.
8.
Lead the free end of the tubing to drain, ensuring it
falls away from the still with no kinks or bends to
impede water flow.
9.
Ensure the stopcock on the constant level contr ol is
closed.
10. Connect the lower inlet of the condenser to the cold
water feed supply. A plastic screwthread connector is
provided for easy attachment to the condenser.
Select good quality tubing and ensure all connections
are secured with hose clips.
11. Connect the distillate outlet on the condenser to a
suitable collection reservoir.
ELECTRICAL INSTALLATION
THIS EQUIPMENT MUST BE EARTHED!
The electrical installation should only be carried out by a
qualified electrician.
The equipment is supplied with 1.7m of flexible triple cor e
circular cable to CMA 3183 TQ specification. The
to BS 6360 Class 5 insulated with
conductors are 1.5mm
2
E.P.R. The outer sheath is 85°C heat r esisting type C.S.P. to
HOFR, BS 6500 Table 9.
Connection to the mains electrical supply, should be via a
double pole isolation switch with a continuous curr ent
carrying capacity of 15A at 250v and over current protection
should be provided by either an approved fuse rated at 15A,
250V in each pole or a double pole appr oved circuit breaker
of similar rating.
These devices should be sited near to the equipment and
clearly marked – "Disconnect device for Merit W ater Still"
Connect to the line supply noting that the wir es in the
instrument lead are coloured in accordance with the
following code:–
Brown
Blue
Yellow/Green – Earth
[ 4 ]
– Live
– Neutral
Mains Cable Replacement
If the mains cable requires replacement, only specially
prepared spare mains lead obtained from Bibby Sterilin
should be used.
OPERATION
1.
Turn on the cold water supply and adjust the flowrate
to approx. 60 l/h. Observe that the water flows via the
condenser and into the boiler. Wait until the boiler has
attained its correct operating level and make sure that
the excess water is flowing freely to drain.
2.
Switch on the electricity supply to the heating element
at the mains isolation switch.
For the W4000/EURO version, switch on the switch
situated on the heater.
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 the 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 Merit Water Still is protected by two safety cut-outs:
Boiler heater thermostats
Should the boiler water level fall and expose
the element the thermostats 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 thermostats by
means of their respective reset buttons mounted on the end
of the heater end cover.
Remove the black plastic cover and then pr ess 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 Technical Service Department of Bibby
Sterilin Ltd.
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