Xylem PL200-G WATER PRESSURE DATA LOGGER - Manual (Page 13)

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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.
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 the logger on the next occurrence of that time.
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.