Casella CEL Thermohygrograph deluxe model - Manual (Page 7)

3. Hold the short-reach black ink pen in the fingers of the left hand and
slide it on to the arm until it stops. Do not use excessive force or
allow the mechanism to become deformed.
Note: Pens have a tapered inner section and are a push fit on the pen arms.
4. Repeat with the long-reach (red ink) pen on the temperature pen arm.
5. Rotate the clock drum to give the approximate time under the long
(red ink) pen.
6. Remove and discard the protective caps from the pen tips.
Do not press the pens on to the paper to see how they
write, as this will damage the fine tips of the pens and
prevent ink flow.
7. Rotate the pen lifter inwards to allow the pens to "almost" touch the
chart.
8. Rotate the clock drum to show the correct time under the long (red
ink) pen, making the last movement anti-clockwise to eliminate
backlash.
9. Continue to rotate the pen lifter inwards until the pens rest against
the chart.
Preparation
Page 7 of 12
THERMOHYGROGRAPH deluxe
User Manual