Flow Control; Nitrogen Purge; Drain - Thermo Scientific ULT-80 Installation & Operation Manual

Flow Control

ULT 80s are equipped with a flow adjustment control knob. The knob is
located directly in front of the control panel on the right side. When shipped,
the flow is completely off. (Check that flow is off before starting.)
To start flow, turn the knob in a counterclockwise direction until desired flow is
obtained. Full flow is obtained by turning the knob approximately 3½ rotations.
To avoid damage, do not overtighten the adjustment knob in either the
open or closed position.

Nitrogen Purge

NOTE: This is a standard feature on ULT 95s, an optional feature for
ULT 80s.
The nitrogen purge valve is designed to accept a constant flow of dry nitrogen
into the reservoir. The nitrogen blankets the cooling fluid, preventing air
oxidation and water absorption.
Remove the reservoir cover by removing the screws. Fill the reservoir with
cooling fluid following the procedure listed above. Replace the cover and
screws. Connect the nitrogen line to the valve on the reservoir cover.
2
Use a pressure regulator, set to 0.5 psig (0.035 kg/cm ) or lower, to prevent
fluid overflow.

Drain

A reservoir drain is located on the rear of the circulator. The drain is a Parker
6PNBZ plug.
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