Brookfield Bath, Model TC-602 - Manual (Page 6)

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Connect the pump inlet and outlet to the external apparatus (See Picture 2 below). To maintain
adequate flow, avoid restrictions in the tubing. When connecting the Circulator to more than two
closed loops, the use of a manifold made of "Y" adapters to divide the fluid into multiple banks is
recommended. After setting up multiple closed loops, check for adequate flow at the return manifold
of each loop and check that the bath fluid is at an adequate level. A booster pump may be added to
closed loops without damaging the Circulator’s bath pump.
Picture 2: Flow Connections: Small Sample Adapter (shown), DIN
and UL Adapters, or Cone and Plate Viscometers
The temperature control stability of a closed loop system is better at the external apparatus than in
the Circulator reservoir (provided the control point of the apparatus represents a constant load and is
well insulated). For example, if you circulate fluid through a viscometer at 50°C, the temperature
variation observed in the Circulator reservoir may be ±0.2°C while the temperature variation in the
viscometer may be only ±0.1°C.
Although temperature stability is generally better at the external apparatus control point, depending
on the length of tubing used and the efficiency of the insulation, the actual temperature reading at
the external apparatus may be slightly different than the temperature reading at the Circulator
reservoir.
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The duplex pump permits circulation to and from an external open bath. To prevent siphoning when
the Circulating Bath is turned off, position both baths so that the two fluid levels are at the same
elevation.
Connect the pump inlet and outlet to the external bath using tubing of the same diameter and length.
The same size fittings should also be used on both the inlet (suction) and outlet (pressure). This
helps ensure a balanced flow. A restricting valve or pinch clip should be installed in the pressure
(outlet) tubing and adjusted to match the return suction (inlet) flow rate. Cut the external end of the
suction tube into a “V” shape so that the tube will not seal itself against the wall of the external tank.
Both the pressure and suction tubing should be securely fastened to the external tank to prevent
movement during use.
When using flexible tubing, the suction tubing must have a wall thickness that will not collapse under
vacuum, particularly when going around bends.
BATH
OUTLET
BATH
INLET