ARES-G2 Getting Started Guide Page 24
Oven Temperature Control
Oven temperature is maintained by a control loop that is closed around several Platinum Resistance Ther-
mometer (PRT) sensors located in the oven. The Oven may use up to five (5) PRT sensors in order to con-
trol the temperature. These are:
• Upper Geometry PRT (Used with Parallel Plate or Cone geometries.)
• Lower Geometry PRT (Used with Parallel Plate or Cone geometries)
• Mid-Oven Air PRT (Used with solid-sample geometries, EVF, SER2)
• Upper Air PRT (Used for fast-response temperature control.)
• Lower Air PRT (Used for fast-response temperature control.)
Using the default system settings, the ARES-G2 will report and control the measured temperatures that are
in closest proximity to the geometry or sample. If Upper and/or Lower Geometry PRTs are connected to
the system, combinations of these measurements will be used to control and measure the Oven tempera-
ture. If Geometry PRTs are not installed, the Oven will automatically use the Mid-Oven Air PRT tempera-
ture.
Measured Oven temperatures from all PRTs are compared to the set point temperature in the FCO Control-
ler, and heater power is changed to minimize the difference between the set point and measured tempera-
tures. The Oven will use faster responding Air temperature measurements to stabilize rapid temperature
changes in the oven, and will use the geometry or Mid-Oven Air temperature measurements to precisely
adjust the final oven temperature.
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