User Guide

RTH100 Series Temperature & Humidity Recorder
Instruction Manual
Page 6
6
Fitting a Chart
Release the clamp as shown in Fig. 4. Fit the chart onto the spindle of the clamp and rotate the chart until the pen tip is on the cor-
rect time line. Lower the chart clamp and press it firmly to ensure that the locating pips pierce the chart. Place the chart beneath the
outer chart clips.
Fig 4. Fitting a Chart
Inking System
All recorders and recorder controllers are fitted with disposable fibre tipped pens. These pens slide onto the pen arms. The recorder
pen arm is removable from the pen mechanism see Fig. 5. It is advisable to remove the pen arm from the mechanism of recorders
when fitting new pens because of the possibility of undue forces being applied to the mechanism thus causing a possible error shift.
Recorder controller pen arms are fixed to the mechanism and must remain in situ when changing pens.
The under side of the pen cartridge contains a recess which engages with the pen arm. The pen is pushed fully along the arm until
the stop is reached. This operation needs care so as to not bend the pen arm and so cause a pen tension problem.
Fig 5. Replacing Pen Arm from Mechanism