The Swiben GDX-30L is an integrated high- and low-temperature circulator that combines a low-temperature cooling pump and a high-temperature oil bath in a single unit. It operates across a -30°C to 199°C range and uses a 30 L reservoir, providing temperature control for connected processes from one machine.

The unit runs a sealed liquid circuit with a separate expansion vessel that is mechanically connected but isolated from the circulating fluid. Because the loop is closed, water vapor is not drawn in at low temperatures and oil mist is not drawn in at high temperatures, allowing the use of heat transfer oil across a wide working range.

It is intended for laboratory and research settings, including biochemical, chemical, medical, and environmental work that requires both deep cooling and elevated-temperature circulation.

How It Works

The system circulates heat transfer fluid through a sealed loop using a built-in pump rated at 25 L/min flow and 7 m lift. A heating and cooling integrated container provides a large heat exchange area for both heating (4000 W) and cooling (850–9200 W). A separate expansion vessel accommodates fluid volume changes while staying isolated from the main circulation, keeping its medium below 60°C regardless of loop temperature.

Key Features

• Combined heating and cooling functions in one circulator unit
• Operating temperature range of -30°C to 199°C
• 30 L reservoir capacity
• Cooling capacity of 850 to 9200 W and heating power of 4000 W
• Circulating pump delivering 25 L/min flow and 7 m lift
• Sealed liquid circuit with isolated expansion vessel to limit moisture and oil mist intake
• Safety functions including compressor overload protection, high-pressure switch, overload relay, and thermal protection