4
Operation
1. Turn on the cold water supply and adjust the flowrate to
approx. 60 l/h.
Note: It is strongly recommended to measure the flow
rate, failure to do so can result in possible injury from hot
water exiting from the Still. If a flow meter isn't available
a simple measurement can be performed with a 1L beaker.
Over a timed period of five minutes the beaker should be
completely filled five times.
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.
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. If the Still has been correctly assembled the hose
should comfortably reach, without any strain.
7. Take the 1000mm length of 16mm bore 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 control 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.
12. Turn on the water supply and test for leaks then turn off the water
supply.
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 core circular
cable to CMA 3183 TQ specification. The conductors are 1.5mm
2
to
BS 6360 Class 5 insulated with E.P.R. The outer sheath is 85°C heat
resisting type C.S.P. to HOFR, BS 6500 Table 9.
Connection to the mains electrical supply, should be via a double pole
30mA RCD isolation circuit breaker with a continuous current carrying
capacity of 15A at 250v and overcurrent protection of 15A, 250V .
These devices should be sited near to the equipment and clearly
marked – “Disconnect device for Merit Water Still“
Connect to the line supply noting that the wires in the instrument lead
are coloured in accordance with the following code:–
Brown – Live
Blue – Neutral
Yellow/Green – Earth
Mains Cable Replacement
If the mains cable requires replacement, only specially prepared spare
mains lead obtained from Cole-Parmer should be used.
Hot warning
Some parts of the product may become hot during
use. These are clearly marked with 'Hot Warning
Labels. Avoid touching these parts.
Circuit diagram
L N
E
~240V
Lamp
Element
Heater flange
(S) Denotes safety critical component.
(S)
Thermostat
(S)
Switch
(W4000/EURO only)
(S)
Thermostat
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