GASURVEYOR 11-500 USER HANDBOOK
6
Alarm Functions
The Gasurveyor 11-500, by default, has both audible and
visual alarms off when operating.
For each range in the instrument where the alarm function
is selected, the options are for audible and/or visual to
be latching or non-latching. That is, where an alarm level
is exceeded, the instrument LED flashes and/or the
sounder pulses rapidly. Latching alarms are cleared
manually, by a double press of Button Two
, after the
detected gas level has fallen below the alarm limit.
Each alarm has to be acknowledged individually, e.g. If
both
LOW
(10%) and HIGH (20%) instantaneous alarms
have been set, then both would have to be acknowledged
individually if LEL is greater than 20%. If the audible
and/or visual indicators are set to off then the display
alarm function would need to be acknowledged in the
same way. Alarm display example is shown in Figure 2.3.
Figure 2.3
LEL Alarm Display Example
When an alarm limit for any gas range is exceeded the
LCD automatically displays the range in alarm. If more
than one alarm is active the highest priority alarm is
displayed. The alarm priorities are Oxygen, LEL.
Non-latching alarms clear automatically when the gas
levels fall below the alarm limit.
Содержание Gasurveyor 11-500
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