Tinius Olsen MP1200 Extrusion Plastometer Page 6-2
Operation Manual # 02002215
6.3 PPDT Arm Length Adjustment
6.3.1 Because any physical adjustments to the PPDT require a complete
disassembly of the PPDT, it is recommended that the user does not attempt
to physically change the length of the arm of the PPDT. The PPDT is a
precision instrument and should be treated with care. It has been designed
so that it resists damage from everyday use, even if the WLD Weight
Lowering device is lowered onto it when it is not rotated into the proper
position.
6.3.2 The arm on the PPDT is designed so that the tip extends 5
9
/
16
” (nominal)
from the counterweight giving a theoretical length from the center of rotation
of 6 inches. This length was set at the factory and should NOT be adjusted in
the field. If the arm is accidentally bent, it can be bent back into the
approximate original shape and recalibrated (Short Calibration), however, to
be absolutely sure that the PPDT is working correct, the PPDT arm should be
replaced and recalibrated. A brief discussion of this procedure can be found
in Section 19.1.
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