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.

 

REPLACEMENT OF PEN

Note: In non-inking units, (that is, when using pressure sensitive recording chart paper) replacement of the pen is not necessary.

Recorders that are equipped with fiber tipped cartridge pens will have a cartridge that is color coded "red" to designate pen number one (1) and an optional cartridge that is color coded "blue" to designate pen number two (2). 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 (2) screws that hold the pen arm be loosened and the pen cartridge and metal pen arm be removed as an assembly. Refer to Figure 6 for the location of the pen arm screws. 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 following figure.

 
Figure 3: Pen Arm Assembly.

 

PEN ARM CALIBRATION

To ensure the accuracy of the recording unit, a mechanical pen adjustment can be conducted.

While the recorder is operating normally (recording temperature or some other variable), press and hold the "change chart" button (#3) for approximately one

(1) second until the pen begins to move to the left and then release the button (refer to Figure 4). Wait until the pen has moved onto the pen lift ramp (if available) or near the edge of the chart paper and stops. Press and hold the "change chart" button (#3) once more until the pen begins to move back onto the chart. The pen should briefly pause at the outer most graduation of the chart before continuing onto the chart to begin recording. If the pen does not stop exactly at this location on the chart, it can be adjusted by using the left (#1) or right (#2) arrow buttons (refer to Figure 4).

When the pen moves back onto the chart and briefly stops, you will have approximately three (3) seconds in which to adjust the pen's position using the left and right arrow buttons of Figure 4. If the time expires before you have a chance to make this adjustment, you can simply repeat this procedure.

On multiple pen recorders, each pen will move (one-at-a-time) onto the chart briefly stopping at the outer most graduation of the chart at which time the pen's position can be adjusted by using the left (#1) or right (#2) arrow buttons. When the time to adjust the position of the first pen has expired, the second pen will move onto the chart briefly stopping at the outer most graduation of the chart at which time the second pen's position may be adjusted.

Each time the chart paper or fiber tip pen cartridge is changed, you should make sure that each pen stops at the outer most graduation of the chart paper. Otherwise, this pen offset will cause the unit to record an incorrect value on the chart.

 

TEMPERATURE RECORDER
CALIBRATION CHECK

This recorder has been accurately calibrated at the factory. Before making any adjustments, this instrument should be in service for 24 hours. Thereafter, if any adjustment is required, perform the following procedure. An annual verification of the calibration is recommended.

 


6

R70-32
REV(07/13) E

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