110-509 BEL/EN
15
External Closed Loop Circulation
WARNING:
When connecting tubing to an external application, it is the user’s responsibility to make
sure that the tubing and fittings connected to the Circulator are suitable for the fluid being used and
the temperature range of operation.
CAUTION:
The Circulator’s bypass tubing is secured to the fluid inlet and outlet connections by high
temperature nylon hose clamps, which can be removed by carefully cutting them with diagonal
cutters.
CAUTION:
Secure the tubing to the inlet and outlet fittings using hose clamps with a minimum ID of
7/8 inch (22 mm). Do not operate the unit without hose clamps.
WARNING:
If the Circulating Bath will not be used for external circulation, the inlet and outlet ports
should remain connected using the Silicone bypass tubing provided with the unit.
The single speed pump on your Circulating Bath permits closed loop circulation to a Viscometer
accessory, such as the Brookfield Small Sample Adapter, via the 1/2 inch / 12.7 mm OD pump inlet and
outlet ports on the rear of the MX Controller. Use the fittings provided with the unit to make external
connections.
If a higher flow rate is desired you can move the flow adjuster toward a closed position as
shown below:
APPLICATION NOTES:
To maintain adequate flow, avoid restrictions in the tubing.
When using the bath for external circulation the front Flow Control Slider must be open one click to the right.
The control stability of a closed loop system is better at the Viscometer accessory than in the immediate vicinity of the
heater (provided the accessory control point represents a constant load and is well insulated). For example, if you
circulate through a Viscometer at 50°C, the temperature variation observed in the reservoir may be ±0.1°C, whereas
in the viscometer it may be only ±0.05°C.
Although stability is better at the Viscometer accessory control point, depending on the insulation and length of tubing
used, the accuracy of temperature may be slightly different than the temperature indicated in the reservoir.
Flow Adjuster
Fluid Inlet Port
Fluid Outlet Port
Bypass Tubing
(cut clamps and remove)
Flexible Tubing
(1/2” ID x 2-1/8” long)
Hose Clamps
(use a 1/4” nut driver or
flat blade screw driver
to tighten)
Barbed Hose Adapter Fittings
1/2” x 1/4”
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