Figure 2-9. Changing Chart Paper and Setting the Time
2.5 Installing and Removing Pens
2.5.1 Installing the Pens
The recorder uses two different colored pens to record information. The red
(upper) pen records temperature. The blue (lower) pen records relative
humidity. Pen life varies with use and climate. Under normal operating
conditions, pens last at least one month. We recommend that you install a fresh
set of pens after every month of use.
To install pens:
1. Make sure the power switch on the front panel is in the OFF or “O” position.
The front panel is located under the control panel door. The recorder door
should be closed too.
The control panel door opens easily by gently gripping the
recessed area at the right side and slowly pulling down.
2. Examine the location of the pen arms through the window in the recorder door.
a. If the pen arms are offset as shown in Figure 2-10, continue to Step 3:
Figure 2-10. Offset Alignment of Pens (for ease of pen installation)
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