Principle of Operation
A sample is placed inside a retractable, tubular furnace. A spring-loaded pushrod is positioned against the sample. The opposite end of the pushrod is connected to a linear variable displacement transducer (LVDT). The dimensional change of the sample resulting from the controlled temperature program is measured as the pushod physically transmits the length change to the LVDT. The displacement is recorded in relation to the temperature recorded with a thermocouple located next to the sample. A calibration or correction curve is applied in compensating for the expansion of the sample holder and pushrod.
Single, Dual or Differential
C-Therm dilatometers can be configured as a single or dual sample configuration and also run as a differential measurement.
The single sample configuration offers users an economical, robust solution.
With the dual sample arrangement, the system’s capacity is doubled for higher-volume sample throughput.
In replacing the second sample with a reference standard the system offers calibration-corrected measurement in one run. The differential arrangement is most appropriate when time is at a premium and the stability of long-term drift is of greater concern.