Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 14)

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Changing the Chart
Press and release the CHANGE CHART key (3 on Figure 2.7). The pen(s) will move to
the left of the chart and green LED will flash rapidly. Wait until the pen(s) stops above
outer ring AND green LED goes to on steady.
Unscrew the chart "hub" knob at the center of the chart. Remove the old chart paper and
position the new one so that the correct time line coincides with the time line groove on
the chart plate. Refer to Figure 2.10 (Page 17) for the location of the time line groove.
Re-attach the chart "hub" knob and screw securely (by hand) against the chart. Press and
release the CHANGE CHART key (3). The pen(s) will move to the outer ring, and then
pause. The green LED will remain on continuously or blink, depending upon the state of
the backup battery. Pen(s) will then go to current recording value. If ink pen(s) did not
accurately pause at the 100% line, see Pen Arm Calibration (Page 25).
If unit has display option, see Display Function (page 24). Check to make sure that the
pen(s) is marking on the chart paper. If it is not, then carefully adjust the pen arm to
establish contact with the paper. On a thermal print recorder, the thermal stylus does not
need adjustment.
Marking Systems - "Ink Type Pens"
This type of pen consists of a self-contained ink reservoir with a porous plastic stylus,
which is snapped around the outer edge of the metal pen arm.
A pen cap is provided to extend the life of the ink pen during shipping, or when the
recorder is not in service. To remove the pen cap, gently lift the pen arm away from the
chart paper. Remove the black plastic pen cap to expose the fiber tip of the ink pen and
gently place the pen back onto the chart paper. Do not let the pen arm "snap" back onto
the chart paper. This will flatten the fiber tip of the pen and will no longer give you a fine
line marking on the chart paper. Place the pen cap in a safe place for future use.
If the stylus does not touch the chart, adjustment can be made by slightly bending the
metal pen arm in the center towards the chart paper. Do not use more pressure than is
necessary to create a fine line marking on the chart paper. Note: As the pen ink supply
runs out, the pen color will become lighter. This indicates that the pen should be replaced.