The Orton Model SP-2A-DAS has been designed to automatically monitor the elongation of a loaded sample fiber and calculate the annealing and strain points according to the ASTM C-336 (Method A). Changes in the annealing and strain point temperatures can be used as an indication of changes in batch chemistry from raw material changes or batching errors.

Automatic Annealing and Strain Point Determination
 It takes 20 minutes to measure the Annealing and Strain Points of a glass fiber. It's simple. After the test fiber is pulled to meet the ASTM specified dimensions, the operator simply places the fiber into the preheated furnace, applies the weight, pushes the START button, and walks away. The system does the rest. The operator is free to perform other tasks. Twenty minutes later, the operator returns and reads the annealing point temperature on the display panel. It's that easy. The SP-2A-DAS automatically calculates the rate of elongation and displays the annealing point temperature which eliminates operator differences, judgements, and errors. If an independent computer system is connected to the SP-2A-DAS, both the annealing and strain point temperatures are calculated and displyed on the computer's monitor. The system automatically measures and records the rate of elongation and applies non-arbitrary mathematical algorithms to extrapolate the strain point temperature so operator differences, interpretations, judgments, and errors are eliminated. The Model SP-2A-DAS is a FAST, EASY, ACCURATE, RELIABLE, and REPRODUCIBLE method for QC checks on batch chemistry changes.

This system is comprised of the ASTM specified furnace to heat the fiber; the Orton PID controller to operate the furnace according to the ASTM C336 thermal cycle, sample support system with sample load rod and weight, an LVDT system to continuously monitor the fiber elongation, the Orton on board computer with internal logic to determine the annealing point, digital display panel for displaying the annealing point temperature, and software for an independent computer (provided by the purchaser).

*Descriptions & specifications are subject to change without notice

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The Model SP-2A-DAS Brochure  is available for immediate downloading in a PDF format (598 KB).

Manual Annealing and Strain Point Measurement Instruments
Model SP-2A System
This is the original system to manually perform the measurements. The temperature of the ASTM specified furnace is controlled manually with a Variac. Using a telemicroscope mounted on an independent stand, the operator manually observes the fiber elongation against an independently supported scale, and manually records that elongation along with the temperature. The operator manually plots the data points and picks the annealing and strain point temperatures from the graph.

Model SP-2A-LVDT System
This is a modified version of the original SP-2A design. It uses an LVDT attached to the bottom of the fiber to sense the elongation. The telemicroscope and scales are not required. The operator manually records the LVDT readings and temperatures, and plots the data on a graph to pick the annealing and strain point temperatures from that graph.