Programmed Temperature Air Bath Oven Heater System (Split) - Siemens Maxum II Manual

Safety Systems - Oven

3.3 Programmed Temperature Air Bath Oven Heater System (Split)

3.3 Programmed Temperature Air Bath Oven Heater System (Split)
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 air bath
oven is a modified version of the isothermal air bath oven. The primary modification is the
addition of a "deflector assembly" in the center of the oven (refer to figure 3-3). This deflector
assembly is a partially enclosed chamber that acts as a much smaller oven compartment which
can be heated and cooled quickly.
Oven Air
Input (from
Heater)
De ector
Assembly
(Cover Not
Shown)
Figure 3-3
The chromatographic column is mounted in the center of the deflector assembly along with a
temperature sensor. The heated oven air from a standard air bath 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 air bath heater is the same for
the programmed temperature oven as for the isothermal air bath oven.
38
Programmed Temperature Air Bath Oven (with Deflector)
Temperature
Probe
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8