Xylem WQ-FDO Sensor and GL500-7-2 Data Logger - Manual (Page 21)

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once per hour as well as the time that the sample-on-demand was triggered. This
feature is used to record the time that special events occurred such as when water
sampler was triggered, a door was opened, etc.
Alarm Times: Check the box
associated with each alarm to
enable that feature and enter
the desired start or stop time.
The logger will start at the next
occurrence of the Alarm 1 time and stop at the next occurrence of the Alarm 2 time
after the Alarm 1 timer has expired. Either or both alarms can be enabled.
Note: The alarm start and stop cycle is a one time occurrence. Once stopped
by the Alarm 2 timer, the logger will not resume logging again until the logger
is reprogrammed. Reprogramming the logger with the timers enabled will
restart the alarm cycle. Reprogramming the logger with the timers disabled
will return the logger to a normal logging state
Use care when programming the alarm times. If left enabled, changing and
reprogramming any of the setup parameters will restart the alarm timers and
could cause the logger to stop recording.
XI. Analog Setup:
The Analog Setup screen sets the engineering units and calibration numbers for
each of the analog channels, the endpoints of the bar graphs in the main screen and
which of the analog channels are enabled. These channels are calibrated in the
same way so only a single channel will be discussed.
It is important to note here that the information
stored in the data logger’s memory is just the
sensors output level before it is adjusted by the
following calibration parameters. These
parameters are used to adjust the stored
data for display and storage purposes only, at
the time the data is downloaded. If they are
changed, the same stored data can be
downloaded again and the data will be scaled
differently according to the new settings.