Product Introduction
This instrument conducts low‑temperature linear thermal expansion coefficient test in accordance with GJB1875‑94 Test Methods for Thermophysical Properties of Rigid Foam Plastics. It is used to measure the mean linear thermal expansion coefficient of various solid materials under ultra‑low temperature. The push‑rod method is adopted. Imported high‑precision micrometric sensor detects specimen deformation at different temperatures. Computer technology realizes automatic detection, control, calculation, printing and data storage.
Technical Parameters
- Temperature range: ‑196 ℃ (liquid‑nitrogen immersion temperature) ~ 300 ℃
- Specimen dimension: less than 20×20×50 mm; 3 specimens can be tested simultaneously
- High‑precision micrometric sensor for specimen deformation detection at different temperatures. Measuring range＞15 mm, resolution 0.1 μm, accuracy 0.2 μm
- Measuring range of mean linear thermal expansion coefficient: 0.001 ~ 300.000×10⁻⁶/℃
- Test accuracy: 0.2 %
- High‑precision high‑low temperature chamber with automatic temperature control and automatic data acquisition A: Temperature gradient: 1 ℃ B: Temperature fluctuation: ≤±1 ℃ C: Temperature deviation: ≤±1 ℃ D: Temperature‑controller display accuracy: ≤0.1 ℃ E: Refrigeration: liquid nitrogen; Heating: heating tube F: Chamber dimension (depth × width × height, mm): 300×350×500 G: Chamber air circulation: Centrifugal‑fan forced circulation H: During heating (positive set‑temperature): temperature shall not exceed set value by more than 1 ℃; During cooling (negative set‑temperature): temperature shall not go below set value by more than ‑1 ℃ I: Heating‑up time: within 60 min from 0 ℃ to +300 ℃; Cooling‑down time: within 40 min from 0 ℃ to ‑190 ℃
- The computer can collect and control three‑channel samples simultaneously. Partial channels can be disabled. Sample information can be input separately for real‑time data calculation, display of thermal‑expansion coefficient, volumetric expansion coefficient, linear expansion value and quench‑cooling expansion. Automatic calculation & compensation of compensation coefficient, manual on‑line correction available. Automatic data recording & storage (file name includes sample information), data printing and temperature‑thermal‑expansion‑coefficient curve printing. Freely‑configurable temperature interval with minimum interval of 1 ℃
- Rated power supply: 220 V, 4 kW
