Tinius Olsen MP1200 Extrusion Plastometer Page 17-1
Operation Manual # 02002215
17 – Preventative Maintenance
17.1 Cleanliness
17.1.1 The most important factor in maintaining the accuracy of a melt index machine is
cleanliness. It is absolutely necessary that the cylinder, orifice and piston be cleaned
after each test. However, be aware that, despite the best efforts, some material will
build up on the components, causing them to appear tarnished or discolored. Tinius
Olsen does not recommend any other cleaning practices besides those detailed in
ASTM D 1238. Refer to Section 16.
17.1.2 Some components of a melt indexer, including the cylinder, piston foot and orifice,
are considered to be consumable, meaning that normal wear will cause them to go
out of tolerance over time. Check the orifice bore frequently using the Go/No-Go
gauge. Inspect the piston foot for nicks or scratches, or for signs of wear on the
edges. Check the cylinder visually for nicks and or scratches. Any obviously
damaged components shall be discarded and replaced.
17.2 Motorized Weight Lowering Device (MP1200M)
17.2.1 For lubrication of the Motorized Weight Lowering Device refer to assembly drawing
No. 5-6-730 in Appendix A of these instructions. Lubrication should be done
approximately once a year or every 1,000 hours of use.
17.2.2 To lubricate the Acme screw & nut, lower the WLD weight platform to its bottom
position. Remove all weights from the weight platform. Using an extreme pressure
grease NLGI consistency #2, add grease through grease fitting (Item 34).
17.2.3 Run the weight platform up and down a few times to check alignment and evenly
distribute the grease.
17.3 Electrical Checks
17.3.1 BE SURE THE POWER IS DISCONNECTED from the melt indexer Controller before
continuing.
17.3.2 Refer to Drawing 8-12-1478. Heater connection is J16. Fuse F1 is Bottom, F2 is
Middle and F3 is Top. F4 is common L1 for all 3 zones.
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