The thermostatted autosampler is equipped with a cooling/heating module that uses Peltier components to effectively cool the air. When turned on, the front side of the heating/cooling Peltier element is set according to the temperature. The fan draws in air from the sample tray area and passes it through the heating/cooling module. Fan speed is determined by environmental conditions (eg ambient humidity, temperature). In the heating/cooling module, the air reaches the temperature of the Peltier element, which is then blown under a special sample pan, where it is evenly distributed and flows back into the sample pan area. The air then enters the thermostat from there. This cycle mode ensures efficient cooling/heating of the vial.

In the cooling mode, the other side of the Peltier element becomes very hot and must be cooled in order to maintain vision performance, which is achieved by a large heat exchanger on the back of the thermostat. Four fans blow the air from left to right together to expel the heated air. The fan speed determines the temperature control of the Peltier components.

Condensed water can appear in the heating/cooling module during cooling. The condensate will be taken out of the thermostat.