Xylem WQ-FDO Sensor and GL500-7-2 Data Logger - Manual (Page 14)

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Bar Graphs: The bar graphs show a visual representation of the most recent data
reading taken by using the Sample Continuously or Get Sample functions. The
upper and lower limits of the display are defined by the user as discussed in detail
later.
Numerical Reading: The numerical reading at the bottom of the bar graph shows
the actual data reading and is updated at the same time as the bar graph.
Successive numerical readings taken by using Sample Continuously or Get Sample
are shown in a list below the bar, up to 5.
Pulse channels: The GL500-7-2 Data Logger has two independent pulse channels,
each with a maximum count of 65,535. At the time of the logger’s normal sampling
interval, the counts are stored in memory along with the other sensor data and time
stamp, and then the counters are set to zero to start the counting sequence over
again. The Pulse Channel 1 and Pulse Channel 2 fields show how many pulses
have been counted since the last logger recording for each of the 2 pulse channels.
For example: If the logger is set to record once per minute and it is put into Sample
Continuously mode, the display will be updated once per second and as pulses are
applied to the pulse inputs, the Pulse Channel fields will update the count. At the
end of the normal one minute sampling interval, the total number of pulses will be
stored in memory and the Pulse Channel fields will show zero until more pulses are
applied. Note that the pulse channels can be scaled to show rainfall, water flow etc.
by multiplying the count by a user definable number as described in detail later.
Alarm 1: This field shows the time that the logger is set to start logging. The start
alarm is a 24-hour timer which will initiate logging, when enabled, at the next
occurrence of that time.
Alarm 2: This field shows the time that the logger is set to stop logging. The stop
alarm is a 24-hour timer which will halt logging, when enabled, at the next
occurrence of that time after the logger has started recording. If the Alarm 1 timer is
set to initiate logging, the Alarm 2 timer will halt logging at the next occurrence of the
Alarm 2 time after the logger has been started by Alarm 1. If the Alarm 1 timer is not
enabled, the Alarm 2 timer will halt logger on the next occurrence of that time.
Note: Use care when programming the alarm times. If left enabled, changing
and reprogramming any of the setup parameters will restart the alarm timers.