THERMOSTAT OF CHROMATOGRAPH Russian patent published in 2003 - IPC

FIELD: thermostatting equipment for separation columns of chromatographs. SUBSTANCE: thermostat of chromatograph has heat insulation body housing heater, separation columns, temperature-sensitive element, fan. Ventilation ducts with dampers are made in rear wall of body. Resistor is connected in series to heater of thermostat. One lead of heater is connected to terminal of power supply source. Another lead of heater connected to one lead of resistor is coupled by means of electron key to another terminal of power supply source. Second lead of resistor is also connected with the aid of electron key to another terminal of power supply source. Algorithm of connection of heater and resistor to power supply source is set by controller program with the help of electron keys. EFFECT: diminished temperature gradient of space of thermostat. 4 dwg