7340_7350-25-33 Series Operations Manual
Rev J 3-31-21
Page 41 of 92
Re-attach the chart “hub” knob and fasten securely against the chart. Press and hold
the “change chart” button (#3) again for approximately one second until the pen begins
to move back onto the chart and then release the button. Check to make sure that the
pen is marking on the chart paper. If it is not, then carefully adjust the pen arm to
establish contact with the paper.
Chart recorder marking system:
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 recording unit 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. As the pen ink supply runs out, the pen color will
become lighter. This indicates that the pen should be replaced.
Replacement of the Pen:
Recorders that are equipped with fiber tipped cartridge pens will have a cartridge that is
color coded "red" to designate pen number one and an optional cartridge that is color
coded "blue" to designate pen number two. The pen cartridge is securely fastened
to the metal pen arm using a special "U" clip tab. For ease of replacement, it is suggested
that the two screws that hold the pen arm be loosened and the pen cartridge and metal
pen arm be removed as an assembly. Unsnap the plastic "U" clip tab of the pen cartridge
from the metal pen arm, remove and discard the old pen cartridge. Replace the new
cartridge by opening the hinge and snapping it securely around the metal pen arm. Refer
to the image below:
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