User Guide

12
The recording pen mechanism assembly, mounted to the base plate via a bracket, provides attachment to the measuring
elements.
Each measuring element provides output movement via an adjustable take-off assembly arm or direct drive arm.
Either type is terminated in a tapped hole to which is attached the adjustable horizontal link via a shoulder screw
forming a pivot without excess side movement for smooth friction free movement.
The adjustable horizontal link is screwed into the ratio post at its opposite end providing a smooth pivot without excessive
free movement or play thereby eliminating hysteresis.
The ratio post provides an adjustable point of pivot for the adjustable horizontal link and span adjustment is thereby
provided by the position of the ratio post which is fitted through the slot in the pen bracket and clamped by a ratio post
washer and locknut in terms of its pivot distance to the pen bracket spindle.
To replace a pen mechanism assembly, remove the shoulder screw(s) from the ratio post(s) and undo the two nuts
securing the pen mechanism bracket to the mounting bracket. Retain all fixings ensuring the relative shoulder screw is
mated with its original linkage.
Mount a new mechanism in reverse order and measure the ratio post(s) distance from the spindle. Adjust the ratio post(s)
to this dimension before carrying out the appropriate calibration procedure.
Clearscan™ Recorder Series - Operating and Service Manual
Fig. 4 Linkage and Pivot Attachments