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2.2.2 Status LED’s
The three status LED’s to the right of the display indicate the general status of the Model
450H Monitor. The green SAMPLE LED indicates the sampling status. The yellow
FAULT LED indicates the fault status. The red ALARM LED indicates the
concentration alarm status. Table 2.4 below summarizes the meanings of the status
LED’s.
LED State Meaning
Green Off
Not monitoring(1)
On Monitoring normally
Yellow Off No warnings exist
Blinking Warnings exist
Red Off No Alarms active
Blinking Alarms active
(1) This occurs during all diagnostics modes
TABLE 2.4 STATUS LED'S
2.3 Software Operation
This section describes the operation of the instrument software through the front panel
interface described in the previous section. The instrument software has been designed to
be easy to use, yet powerful enough to allow the user to customize the instrument for a
particular application.
2.3.1 Main Menu
Figure 2.2 below shows the shows a typical main menu for a Model 450H.
<TST TST> ALRM MSG CLR SETUP
SAMPLE TIME=15:58:21 12.0 %
FIGURE 2.2 - MAIN MENU
If <TST or TST> are pushed, the upper center display cycles through list of available
test functions (see Table 2.3).
P/N 02826B1 Teledyne API Model 450H O
3
Monitor Instruction Manual - Page 30