Teledyne 2120XL - Trace Nitrogen Analyzer - Manual (Page 50)

Operation Model 2120XL
Teledyne Analytical Instruments 38
VFD screen that are not yet accepted by use of the ENTER key or to
move backwards through previous screens.
The VFD screen text that accompanies each operation is repro-
duced, at the appropriate point in the procedure, in a Arial Narrow Bold
type style. The various operational modes are printed in CAPITALIZED
ITALICS.
Figure 4-1 shows the hierarchy of functions available to the
operator via the screen menus.
Any function can be selected at any time by pressing the
appropriate key (unless password restrictions apply).
Each of these functions is described in greater detail in the
following procedures.
4.5 Analyzer Functions
Analyzer functions are accessed from front panel keys.
There are six selectable functions plus the ENTER and ESCAPE
keys. They are:
1. Analyze: This is the main operational screen of the
analyzer and displays the current concentration plus an error
indication if any error exists.
2. System: This function contains nine sub functions that are
used to user to set up the instrument for your application.
3. Span: Contains sub functions used for span calibration.
4. Zero: Contains sub functions used for zero calibration.
5. Alarms: Contains sub functions used to configure the
concentration alarms.
6. Range: Allows the user to set the upper bound of the
instrument range.
In the following section, Section 4.5.1, each screen display is
described with information on how to access and modify the various
items within each screen.