Tinius Olsen MP1200 Extrusion Plastometer Page 18-1
Operation Manual # 02002215
18 – Calibration/Verification – PPDT Attachment
NOTE: ASTM D 1238 recommends that the melt indexer should be thoroughly inspected and
verified for compliance to the specification at least annually. Follow the guidelines as detailed
in the current version of ASTM D 1238, or contact Tinius Olsen Field Service to arrange to
have the machine verified by Tinius Olsen personnel. Tinius Olsen’s Field Service Department
is accredited by A2LA for the calibration/verification of melt flow indexers and maintains NIST
traceable calibration equipment and can issue the calibration/verification certificates that are
required by many quality programs. Contact the Tinius Olsen Field Service Department for
more information.
18.1 Calibration/Verification Procedure for PPDT
18.1.1 Introduction
18.1.1.1 Accurate calibration and verification of the measuring capabilities of the PPDT can be
accomplished using the optional PPDT Calibrator (Part Number 02001531) and adapter
assembly (P/N 02002195). The calibrator consists of a “0 -2" barrel type micrometer head
and a mounting bracket. The micrometer has a resolution of 0.001 inch. See drawing 5-
6-554 in Appendix A.
18.1.1.2 The instructions in this section only cover the calibration of the PPDT when used with the
MP1200 Controller. Please contact the factory for information on calibrating other types of
actuating switches and controllers.
18.1.1.3 Before proceeding, read and comprehend the information on the PPDT theory of
operation found in Section 19.1.2. Only then should you proceed with the PPDT
Verification/Calibration.
18.1.2 Theory of Operation
This section will describe how the calibration parameters affect the operation of the
PPDT.
The distance of the piston above the zero position is calculated using the angle from the
horizontal reference, the PPDT Offset and the PPDT Arm Length using the equation in
Section 19.1.2.1.
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