External Circulation - Thermo Scientific STANDARD Series Manual

External
Circulation
Requirements
CAUTION
Thermo Scientific
The plumbing connections for external circulation are located on the rear of
the thermostat.
connections are 16 mm O.D. Remove the union nuts and plates to install the
8 mm or 12 mm hose barbs and clamps supplied with the unit.
Tubing
Ensure none of the tubing comes in contact with the power cord.
Tubing is normally used to connect the pump to an external application.
NOTE Cap the pump nozzle with the supplied fitting for maximum pressure
to the external application, it may be necessary to remove the thermostat
from the bath to access the nozzle.
NOTE The maximum allowable length of tube depends largely on the
size, form and material of the external vessel. The length of tube and its
diameter, combined with the circulating capacity, have a large effect on the
temperature stability. Whenever possible, use a wider tube diameter and place
the application as close as possible to the circulator.
Extreme operating temperatures will lead to extreme temperatures on
the tube surface, this is even more critical with metal nozzles.
• the required tube material depends on the heat transfer liquid used
• tubes must not be folded or bent
• after prolonged use, tubes may become brittle or they may get very soft,
check them on a regular basis and replace if necessary
• secure all tube connections using clamps
When using the internal bath only, the plumbing connections can be closed
with the supplied plate and union nuts.
is the return flow from the external application.
is the outlet flow to the external application (supply side). The
Return Flow
Plumbing Connections (Typical)
Ensure the supplied
o-ring is installed on
the nut.

Pump Nozzle (Typical)

Section 3 Installation
Outlet Flow


3-5