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User adjustable monitor alarms
Do not set upper and lower alarm limits to extreme values, as this could reduce the
Caution:
effectiveness of the monitoring alarm system.
Monitor alarm delay active indicator
Monitor alarms for O
, NO
2
displayed. This delay only affects the monitor alarms, all other alarms remain active.
The Monitor Alarm Delay Active indicator will be displayed for two minutes:
• Upon exit from the calibration screen (whether or not a calibration was actually performed)
• Following an automatic low calibration
• Following completion of an auto purge
The O
, NO
, and NO monitors have user adjustable alarm settings that are displayed to the side of the
2
2
monitored value.
• The top button is the high-level alarm setting, and the lower button is the low-level alarm setting
(see Figure 4-2).
• A low-alarm limit cannot be set above the high-limit setting.
When an alarm occurs for a monitored value, the violated alarm setting button flashes red
(see #3 in Figure 4-2).
• To adjust an alarm level to a new value, press the selected alarm level button on the touch screen, rotate
the control wheel to adjust to the new level and then confirm by pushing the control wheel or the selected
alarm level button again.
• If the new alarm level is not confirmed within 20 seconds, the alarm level defaults back to its
previous value.
The adjustment ranges for these alarm settings are shown in the table below.
Alarm
Adjustment
High NO (ppm)
1 to 100
Low NO (ppm)
0 to 99
High NO
(ppm) 0 to 5
2
High O
(% v/v)
21 to 100 Then OFF (--)
2
Low O
(% v/v)
18 to 99
2
The first time a dose is set from zero, the upper and lower NO alarm limits are set 50% above and 50%
below the set dose.
* Dose settings < 3 ppm will result in a high alarm setting of 5 ppm; otherwise rounded up to the nearest ppm
and limited to 90 ppm maximum.
± Rounded down to the nearest ppm.
4-14
, and NO will be inactive anytime the Monitor Alarm Delay Active indicator is
2
Increments
NO *0.0-1.0 by
0.1 ppm *1-99 by
1 ppm
NO
by 0.1 ppm
2
O
by 1%
2
Default
Initially 90, then 50% above the initial set dose*
OFF (--) then 50% below the initial set dose
3
-- (OFF)
21 %
Priority
High
±
High
High
High
High
Part No. 20568 Rev-02
2015-08
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