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M400E Ozone Analyzer Operator’s Manual Theory of Operation
11.4.1.1. Front Panel Display
The main display of the analyzer is a Vacuum Florescent Display with two lines of 40 text characters each.
Information is organized in the following manner:
MODE FIELD: The far left portion of the top line of text displays the name of the operation mode in which
the analyzer is currently operating for more information on operation modes see Section 6.1.
MESSAGE FIELD: The center portion of the top line of text displays a variety of informational messages.
Warning messages are displayed here, as are responses by the analyzer to queries for operation data
about the instrument. During interactive tasks, such as instrument calibration or certain diagnostic
procedures, the instrument’s response messages are also displayed here.
CONCENTRATION FIELD: The far right portion of the top line of text displays the concentration of the
sample gas currently being measured by the analyzer. The number reported here is the actual
concentration of the Sample Gas reported in whatever units the user selects. This number remains
unaffected, regardless of how the ranges of the instrument’s analog outputs are configured.
KEY DEFINITION FIELD: The Bottom line of text displays is reserved for defining the function of the row
of keys just below the display. These definitions change depending on which part of the software menu
tree is currently being displayed.
11.4.1.2. Keypad
The row of eight keys just below the Vacuum Florescent Display are the main method by which the user
interacts with the analyzer. These keys are context sensitive and are dynamically re-defined as the user moves
around in the software menu structure.
11.4.1.3. Front Panel States LED’s
There are three status LED’s located in the upper right corner of the Model 400E’s Front Pane. They are:
Table 11-6: Front Panel Status LED’s
NAME COLOR STATE DEFINITION
SAMPLE
Green
Off
On
Blinking
Unit is not operating in
SAMPle mode, iDAS is disabled.
Unit is operating in
SAMPLe mode, front panel display being updated,
iDAS data being stored.
Unit is operating in
SAMPLE mode front panel display being updated,
iDAS Hold-Off mode is ON, iDAS disabled
CAL
Yellow
Off
On
Blinking
AUTOCAL disabled
AUTOCAL enabled
Unit is in calibration mode
FAULT
Red
Off
Blinking
No warnings exist
Warnings exist
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