Programmed Temperature Air Bath Oven Heater System; Figure 1-4 Programmed Temperature Airbath Oven (With Deflector) - Siemens Maxum II PD PA AP Service Manual

1.2

Programmed Temperature Air Bath Oven Heater System

In chromatographic applications "temperature programming" is used in special situations
where incremental increases in column temperature are needed in order to reduce retention
time (the time required for separation). In the Maxum II, the programmed temperature airbath
oven is a modified version of the isothermal airbath oven. The primary modification is the
addition of a "deflector assembly" in the center of the oven. This deflector assembly is a
partially enclosed chamber that acts as a much smaller oven compartment which can be
heated and cooled quickly.
Figure 1-4 Programmed Temperature Airbath Oven (with Deflector)
The chromatographic column is mounted in the center of the deflector assembly along with a
temperature sensor. The heated oven air from an airbath heater assembly flows into a hole
in the center of the deflector. The interior shape of the deflector allows the temperature of the
air around the column to be carefully controlled. The interior shape and small size of the
deflector compartment allow the temperature surrounding the column to be modified very
quickly such that temperature programming can be used.
Within the Maxum II, temperature control and air purging of the airbath heater is the same for
the programmed temperature oven as for the isothermal airbath oven.
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
1.2 Programmed Temperature Air Bath Oven Heater System
Oven Types
11