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messages are still in effect, the warning messages will re-appear after they have been
cleared.
The ALRM button is displayed when concentration alarms have been triggered. See
Section 2.3.3 for operation of the Alarm menu.
The MODE button will toggle the instrument between Auto and Manual modes. The
current mode is shown in the upper left-hand corner of the display. In Auto mode, the
instrument will continuously cycle through a user defined sequence of streams(See
Section 3.2 for sequence configuration.) When the instrument is in manual mode, it will
hold on a particular stream being measured until the user switches back to Auto mode or
manually switches to a different stream. Figure 2.3 below shows the main menu when
the instrument is in Manual mode.
<TST TST> MODE ALRMSTRM MSG CLR SETUP
MANUAL #1 TIME=15:58:21 O3=0.005
FIGURE 2.3 - MAIN MENU, MANUAL MODE
In Manual mode, the STRM button appears. Pressing this button will manually cycle
through the available streams. Press STRM until the stream you wish to monitor appears
in the mode display in the upper left-hand corner of the display. The instrument will hold
and monitor this stream until the user places the instrument into Auto mode or manually
switches to another stream by pressing the STRM button again.
Pressing MODE will toggle the instrument back to Auto mode and the automatic
sequence will resume.
2.3.2 Multi-Stream Operation
This section describes the operation of the Multi-Stream M450 in automatic sequence
mode (AUTO.) In this mode the monitor is designed to continuously cycle through a
user-defined sequence of sampling points. This cycling is accomplished by activating
valves on the stream selector manifold on the rear panel to admit sample gas for a
particular stream.
When the M450 first switches to a new sample stream, the instrument goes through a 30
second dwell phase where sample gas is pulled from the new sample stream but no
readings are taken. The purpose of this dwell phase is to purge out any “old” sample gas
P/N 02395D1 Teledyne API Model 450 O
3
Monitor Instruction Manual - Page 36