SunTherm 100

Column Thermostat

The cooling effect due to the introduction of cold eluents on the column is eliminated as SunChrom provides an optional heat exchanger. This provides for narrower and more symmetrical peaks, even though it increases the system volume by a few µL.

The column oven SunTherm 100 provides the capability to maintain a precise temperature in the range from 5 °C to 100 °C. The heating transfer occurs via an aluminum block is in the heating area and provides for optimum contact with the column. The thermal energy is transmitted directly by contact to the metal. Since the SunTherm Column Oven does not include any movable parts it is exceptionally effective and reliable. 

Why do you have to thermostat the column?

An HPLC-separation is reproducible when the temperature of the column is maintained at a given temperature. In addition, some separations require an above or below ambient temperature. As examples, separations using a chiral phase frequently require cooling, while many ion exchange separations are optimized at elevated temperatures. In the same vein, the retention times of the compounds that are being separated and the selectivity are temperature dependent.

The influence of a change in the temperature on the separation can be eliminated with the use of a column oven that maintains a stable temperature. It should be noted that GLP requirements dictate the need for temperature control and documentation of the temperature. In addition, an elevated temperature of the separation column serves to lower column back pressure and leads to narrower peaks, which leads to the possibility of faster separations.


The entire length of the column is housed between aluminum blocks and with the pre-heating of the eluent the user obtains fast, optimal heating and fast transfer of heart to the column. The aluminum blocks are available as a number of lengths so that essentially all columns can be accommodated. The SunTherm Column Oven is available in two versions; the SunTherm 100 has a heater while the SunTherm 5 – 100 includes a heater and a Peltier-cooling system.

The microprocessor based controller provides control of two separate processes, heating and cooling. In the heating mode, the Peltier elements and the fan are disabled, while in the cooling mode, only the Peltier elements are in operation. The system continually monitors the temperature and both the heating and cooling elements are controlled so that the smallest change in temperature will activate the appropriate element to ensure that the desired temperature is maintained. Since there are no moving parts except for the fan, the SunTherm Column Oven is extremely reliable and rarely stops operating.

Operating principlesGeneral
Operating principles  
Temperature Range 5 °C above the ambient temperature to 100 °C (SunTherm 100) 5 °C to 100 °C but a maximum of 20 °C below the ambient temperature (SunTherm 5 – 100)
Heating Resistance Heaters (2 x 25 W)
Cooling SunTherm 5-100 Thermoelectric with Peltier-Elements (2 x 25 W)
Heat Transfer Via black anodized alumina blocks, 60; 70 and 100 mm long
Temperature Setting In 0.1 °C Steps
Temperature Display 5.0 – 100.0 °C in decimal format
Temperature Stability < 0.5 °C; typically <0.1 °C at 40 °C (heating mode only)
Temperature Precision < 0. 5 °C; typically <0.2 °C at 40 °C
Temperature Reproducibility < 0,5 °C
Column Capacity 1 x 300 mm main column with pre-column or 1 x 300 mm main column with heat exchanger
Power Requirements 100-120 VAC / 220-230 VAC
Energy Usage Maximum 100 W; Electronically controlled for minimum energy usage
Dimensions (w x h x d) 120 x 200 x 535 mm
Dimensions of column compartment (w x h x d) 21 x 21 x 400 mm
Weight 10 kg
Part Number Short Description
0882.100 Column Oven SunTherm 100
0882.101 Column Oven SunTherm 5-100
0882.111 Heat Exchanger (15 cm)
0882.112 Heat Exchanger (50 cm)
0882.203 Transformer
0882.210 Pt100
0882.211 Thermostat
0882.216 Column Clamp, 60 mm
0882.217 Column Clamp, 75 mm
0882.218 Column Clamp, 100 mm
0882.220 Heating Foil 25W
0882.301 Peltier-Element
0882.302 Fan
0882.303 Cooling Unit