Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 21)

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Alarm Settings Ink Style Recorders
Alarm setpoint values are selected by positioning the pen to the actual value on the
recording chart. Alarm settings can be selected or viewed after CHART CHANGE,
recorder setup or during initial power up. To set the alarm setpoint during normal
recording operation, complete the following steps.
Press and release the CHANGE CHART key (3 on Figure 3.2). Wait until pen(s) moves
off scale and LED status changes from flashing to steady. Press and release the
CHANGE CHART (3) again, the pen will begin to move back onto the chart briefly
stopping at (or close to) the outermost graduation of the chart. Green LED remains on
steady during this time.
Single Alarm Setting
After the above operation is complete, the active pen(s) arm will move to the current
alarm setpoint position on the chart (one pen at a time). The green LED will go out,
during this time the alarm setpoint (for each pen) can be adjusted using the LEFT arrow
(1) or the RIGHT arrow (2) keys on the keypad. Once the alarm setpoint is set, wait for
the green LED will turn on and the pen arm will move to indicate the probe's temperature
and the unit will begin normal recording operation.
Band Alarm Setting
When programming the recorder for band alarm operation, the active pen(s) will move to
the first band setpoint on the chart. The green LED will go out. The alarm band 1 setpoint
can now be adjusted using the LEFT arrow (1) or the RIGHT arrow (2) keys, once set,
wait for the green LED to turn on. The active pen will then move to the second band
alarm setpoint. The green LED will go out. The alarm band 2 can now be adjusted. When
pen(s) alarm setpoints adjustments are completed, wait for the green LED to turn on and
the pen arm will move to indicate the probe's temperature and the unit will begin normal
recording operation.
The “Change Chart” key is the “RESET” when the recorder is programmed for latching
alarm operation.
NOTE: Alarm reset occurs upon depressing “Change Chart” (3) key regardless of alarm
condition.