Chemgard Infrared Gas Monitor Section 6, Data Logging
Section 6
Data Logging
Log Size
The Chemgard unit allows 1,078 sets of data and
events to be logged. This data is either the
maximum or average of the "last" data calculated.
Last Values
The maximum value is taken from the ’last’ data;
this is not always the highest value displayed, but
the last valid data taken from a point. The
average is an average of ’last’ data values.
Usually, the last data is the fourth reading during
normal operation (or the twelfth reading
if the
monitor is in an extended dwell). Invalid (blank)
and under-range data are not recorded.
Over-range is recorded as 1000 ppm.
Number of Data Points Used
If the unit is only a single point monitor or all but
one point is inactive, the value is recorded every
sixteenth reading; this is 30 values per hour. With
four points active, 15 values per point are
recorded every hour. The number of values can
be considerably lower if the monitor enters
extended dwell because of high gas
concentrations.
User Setup Options
When the monitor enters the Ready State, the
data array is cleared. Then, four valid
concentration values are needed before any data
is recorded. Concentrations are recorded either
every 15 minutes or hourly. If the logging function
is turned OFF, the clock/calendar chip is stopped
to save battery energy.
•
Before the logging is turned ON, the
clock/calendar must be set.
Setting any value starts the clock/calendar. Hours
or days may be skipped or repeated. The log can
be cleared in the Setup Menu.
Viewing Alarms/Events and
Data
From the Review Events Screen, the user can
view just alarms, just events, or both. The latest
event is presented first. When the memory is
filled, the entries wrap around.
From the Review Data Screen, the user can view
the recorded concentrations. The particular point
must be selected. Again, the latest data is
presented first; when the memory is filled, the
entries wrap around.
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