Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 23)

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Alarm Settings Display Option Features
The single red LED display indicates input(s) process variable value with unit(s)
during normal operation. In 2 pen units with display, LED display cycles between
Pv1 value and Pv2 value. As PV value cycles an additional LED indicates which Pv
(1 or 2) value is being displayed.
LED display will indicate Hi or Lo if process input variable goes above(Hi) or
below(Lo) the programmed range of the recorder scale.
When battery option is included on Ink style recorders, display will go to ----- upon
loss of AC power. Green LED indicator will remain on, see Battery Backup
information (page 17).
When OFFSET is used to adjust a pen recording position, the LED display will
indicate the actual number of units the selected recording pen has been adjusted
(OFFSET) by. This can be a positive(+) or negative(-) value.
For Thermal units ONLY, if alarm setpoints are used, these values will be shown
upon any chart change operation. See information on Changing the Chart (page 15.)