BÜCHI Labortechnik AG
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7
3. NAVIGATING THE SOFTWARE
INTERFACE
The Model 3300 software interface features a collapsible
menu located in the upper left corner of the LCD screen. The
following sections describe the software menu options in
detail. The Help Button, “?” can be pressed in many
software screens in order to access Help Screens which offer
assistance with using the software functions.
3.1 MAIN SCREEN
The Operation screen is the main screen displayed during
use of the instrument. This screen provides the following
information for the currently loaded method:
•
Method Name: Currently loaded method name.
•
Temperature: Set point and read value of the drift tube
temperature in °C. The temperature range is from 25.0 to
120.0
o
C. NOTE: There are two heated zones in the drift
tube, a lower zone and an upper zone. The value
displayed on the main screen is the average value for the
two zones.
•
Gas Flow: Set point and read value of the nebulizer gas
flow rate in L/min. The gas flow range is from 0.0 to
4.0L/min.
•
Gain: Current gain setting. Possible gain values are 1,
2, 4, 8, and 16. A gain setting of 1 produces an
unamplified signal, and each increase in gain setting
produces twofold signal amplification over the previous
setting.
•
Signal Output: The signal output in mV is displayed
when the instrument is in Run or Cleaning modes. The
output is not displayed in Standby or Heating modes. If
the output value exceeds 2.5V, the signal output will read
‘High’. If output drops below -500mV, the signal output
will read ‘Low’.
•
Method Run Time: The elapsed time for the method run
is displayed in the upper right corner if a method run has
been started. The time value will remain until the method
run has been stopped.
•
Chart: The chromatogram trace of up to 60 minutes will
be active for Run and Cleaning modes.
•
Mode: The current mode of the detector (Standby, Run,
Heating, or Cleaning).
•
Equilibrating Indicator: If the detector is in Run mode
and the heaters and gas flow have not reached their set
points, the screen will display “Equilibrating” next to the
Mode status until the equilibration requirements are met.
The equilibration requirements are: lower drift tube,
upper drift tube, and optics block must be within 1.5C of
their set points; gas flow must be within 0.3L/min of its
set point; the temperatures and gas flow must meet the
requirements for 60 seconds before the message
disappears.
•
Timed Mode Change Reminder (not shown): If a
timed mode change has been scheduled, a reminder for
the event will be displayed next to the Mode status.
•
Errors: Any errors that occur on the instrument will be
displayed in the lower right corner of the screen.
The software Menu is located in the upper left corner of the
screen. There are four main Menu headers: Operation,
Method, Configuration, and Maintenance. The following
sections describe the software functions within these
headers.
3.2 OPERATION
3.2.1 MODE
The Model 3300 ELSD has four operational modes: Standby,
Run, Heating, and Cleaning.
STANDBY MODE
Select Operation/Mode/Standby and press Enter to put the
detector into Standby mode. In Standby mode, the heaters,
gas flow, and laser are off. The signal output is not
displayed, and the chromatogram trace is not active. The
detector enters Standby mode after power-up with the last
saved method conditions.
RUN MODE
Select Operation/Mode/Run and press Enter to put the
detector into Run mode. In Run mode, the heaters, gas flow,
and laser are on. The signal output is displayed and the
chromatogram trace is active. Run mode is used for sample
analysis.
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