EST Encon Evolution, User Manual

Page: 35 / 72

Desorb Flow Control (psi/kPa) – DFC is an enhanced feature of EST Analytical’s water
management system. It provides for lower flow through the trap during desorb while
maintaining higher split ratios at the GC inlet. Setpoint is tied to EV pressure and must
be above the initial column head pressure to increase split flow.
Desorb Preheat Temperature ( ° C) – This is the temperature the adsorbent trap is heated
to before the GC carrier gas is directed to the adsorbent trap to back flush and transfer the
analytes to the GC inlet.
This temperature can be programmed from 25°C to the set point
in 1°C increments
Desorb Temperature ( ° C) – This is the temperature the adsorbent trap maintains during
the desorb process. The temperature can be programmed from 25°C to the set point in
1°C increments.
Desorb Time (min) – This is the total amount of time the GC carrier gas is in line with
the adsorbent trap to sweep the analytes to the GC inlet. The trap desorb time can be
programmed from 0.0 to 999.9 minutes. The Encon EV will send out a start signal to the
GC as soon as desorb starts.
Trap Bake Temperature ( ° C) – This is the set point temperature of the adsorbent trap
during bake. The trap bake temperature can be programmed from 35°C to the set point in
1°C degree increments.
Programmable Trap Bake Temperature - <click> the Program button to enable this
feature. The screen as shown in Figure 3k will appear. <Check > the Enable Ramp
Control box to program the desired settings.
Initial Temperature ( ° C) – This is the beginning temperature programmed in °C.
The temperature can be programmed from 25°C to the set point in 1°C
increments.
Initial Hold Time (min) – This is the time in minutes the initial temperature is
maintained. The initial hold time can be programmed from 0.0 to 999.9 minutes.
Ramp Rate (( ° C/min)/min) – This is the rate programmed in °C/min per minute
the bake temperature will increase after the initial hold time has expired to the
desired final temperature set point. The temperature can be programmed in
1°C/min to the final temperature set point 1°C/min increments.
Final Temperature ( ° C) – This is the ending temperature programmed in °C.
The temperature can be programmed from 35°C to the recommended bake
temperature in 1°C increments.
Final Hold Time (min) – The final hold time is not a value to be entered by the
User. The final hold time is the calculated difference of the final bake time taken
from the sum of the initial time and the ramping time needed to achieve the final
temperature.