The Digital Encoder:
Use and Calibration
Introduction
Method B Encoder Option
Encoder Advantages
A digital encoder module is available from DYNISCO POLYMER TEST. It
permits the collection of multiple data points from one charge of the barrel. It
eliminates the need to use the clear plastic "flags" and replaces the electronic
eye assembly in the instrument. The digital encoder makes operation of the
instrument much faster and easier.
The Digital Encoder option replaces the optical flag and sensor with highly
accurate digital flags and sensors. You can perform experiments using from one
digital flag up to fifteen digital flags. The Dynisco Polymer Test Encoder for
Method B tests employs a 1016 count optical encoder coupled to high accuracy
gears to measure the piston travel. The optical encoder has dual outputs,
enabling the signal to be processed in quadrature, yielding a resolution of 0.015
mm. The linear distance of the piston is transferred to rotary displacement via a
precisely calibrated arm. The tip of this arm employs a hardened & ground tip
for extra long life. Accuracy over the ASTM measurement range of 0.25" and
1.00" is +/-0.4%. The optical encoder, while being very accurate, also enables
the test length signal to be processed & varied digitally. Thus, any test length
up to 1"(ASTM) or 30 mm (ISO) may be selected. Up to 15 MFR results per
barrel filling can be obtained.
The unit is securely fastened to the rear of the Melt Indexer, and the arm latches
down to facilitate cleaning of the unit after the test is completed.
Completely Automatic Test Length Selection on Single MFR Tests
Up to 15 MFR readings per Barrel Filling
Any test length ("Flag") up to 30 mm
User Defined test length & test spacing for single or multiple tests
Automatic Test Length & Test Spacing for multiple tests
Ten test conditions stored internally
Series 4000 Melt Indexer Operation Manual The Digital Encoder: Use and Calibration
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