Instruction 3015-4149
19
SECTION 10
Log Interval and Trend Screen
The HGM300 retains a data log of 100 measurements per zone. The stored measurements are displayed
on the Trend Screen starting on the left and moving to the right.
The LOG INTERVAL setting is a useful tool to determine what is occurring in a mechanical room over
time. The log interval is the number of minutes from 0 to 1440 (1440 minutes is once every 24 hours)
between each log point. This parameter can be changed from Zone Setup Screen #1 for each zone.
(When the log interval is set for 0 minutes, the trend is recorded every time the zone is sampled.)
From the top level Zone Screen press the button adjacent to the zone that you wish to work with to go to
that zone’s Zone Setup Screen #1, and then press the button under TREND to go to the Trend Screen for
that zone.
The Trend Screen opens with a graph showing the most current data point. Use the left/right keypad keys
to move the cursor across the screen. As you move across the screen the date and time of the reading
and the PPM level will be displayed. Use the ZOOM IN and ZOOM OUT buttons to adjust the vertical
scale.
Trend data is recorded on a first in, first out basis. After 100 trend values have been stored the 101
st
value will replace the first stored value.
Zone Setup Screen #1
Trend Screen
