20
•
Pressure ‘P’ – 0 – 500PSI
•
Stirring Speed – Low, Medium, High (Medium is recommended). Stirring is required for digestions.
•
PreMix Time – 0-120 seconds
6. Press the Discover key to activate and program parameters for the ActiVent® option and select the vessel type.
NOTE:
The ActiVent feature is REQUIRED for the Ramp to Temperature Control Option. It allows the Discover to release
unwanted gaseous byproducts from the reaction to prevent over pressurization and vial failure from gaseous buildup.
NOTE:
If the ActiVent feature is not set, the system will automatically release excess pressure above 500PSI or 35Bar.
Select or change the Vessel Type – Vessel or Vessel with Liner.
7. Enter the desired vent parameters using the “arrow” keys to navigate between Delta pressure, Stage, PressureSP,
and Times @ SP. Use the “+/-” keys to increase and decrease the numeric value.
The “Delta Pressure” is the assigned amount of pressure to drop from the pressure set point before reclosing. A
minimum delta of 50 PSI (3.45 BAR) for 4 mL and 10 mL vessels is recommended.
•
The “PressureSP” is the pressure set point at which the venting will begin. The pressure vent setpoint should be
set at a value appropriate for the sample type and size.
•
The “Times at SP” is the maximum number of times a reaction will vent during the assigned ramp and hold time
at that vent point. This parameter should be adjusted based on specific reaction conditions.
•
The number of stages is the stage at which the PressureSP will be active for a multistage method. A maximum of
5 stages can be added.
8. Once all parameters have been entered, press the ENTER key to return to the method parameters screen.
9. Press the ENTER key again to accept all method parameters.
Save a Method
Saving a method allows the user to save/store the method so it can be recalled later. There are two (2) options to save a
Method: (a) press the DISCOVER key, highlight “Save” and press the ENTER key or (b) press the start key after
programming a new method.
NOTE:
A method can be created and used without being saved. If not saved, once the method has been used, but before
any modifications are made to the screen, the method can be saved using the (a) procedure outlined above.
NOTE:
All of the current user’s methods can be saved to a USB device and transferred to another instrument or placed
on a personal computer. Refer to the section titled “Back Up Methods” for additional information.
After programming a new method, when the Start key is pressed, the user is given the option to save or not save the
method that is currently set to start. If “No” is selected, the method that was just created will be sent to the Discover and
the reaction will begin. If “Yes” is selected, the method will be saved and the reaction will start immediately after the
method has been saved.
1. Create a new method (refer to section “Create New Method”).
Содержание Discover SP-D
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