6-1
Chapter 6
Data Logging
Log Size
The Chillgard RT 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 v
alue 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 t
he 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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