Condensing power is provided by coolant
from a re-circulating chiller which is
remotely controlled by the Rocket 4D to
maintain optimum coolant temperature at all
times.
To ensure efficiency of the recirculating
chiller, the coolant level must be topped up
using use a mixture (50% water, 50% mono
ethylene glycol) and the chiller must be set
to remote control mode. Refer to the chiller
operating manual for details.
The Rocket 4D software monitors the
temperature of coolant entering the
condenser and compares it to the
temperature of coolant leaving the
condenser.
The difference (∆T) equates to the heat
energy transferred from the evaporated
solvent to the condenser and is proportional
to the flow rate of solvent vapour entering
the condenser. As samples approach
dryness, the reduction in ∆T is used to
determine the auto stop trigger point.
Coolant stabilisation
External effects are likely to cause uneven
heat distribution within the coolant circuit
when the system is not in use, this can
affect ∆T stability for a period after the
evaporator is switched on. To allow time for
stabilisation, the system does not attempt to
set the end of stage trigger point during the
first five minutes of operation.
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