Origin	China
Model Number	HWX-II
Brand Name	Huafeng instrument

The main technical parameters

1, The scope of thermal conductivity: 0.015 ~ 10w / m • k  or 0.035 ~ 20w / m • k

2, This instrument can do constant power plane heat source method test by providing the test in a controlled temperature

3, Its digital and temperature measurement is better than the level of 0.2 and has automatic electronic compensation function at room temperature

4, measurement accuracy : ± 3%, precision ± 2%, reproducibility: ± 2%;

5, measurement of heating power is not less than 35W ± 1%

6, Under the steady-state condition, PC can actual automatic test PC a test data in 3 minutes

7, it can show the experimental parameters, curves, and putout data printout

8, Sample size: sample1:200 × 200 × 65mm; sample 2:200 × 200 × 22mm; sample 3:200 × 200 × 90mm.

9. Test device includes sample, sample fixture, heating system and single-chip data acquisition & processing

10. Experimental conditions: (1) the sample being tested is homogeneous and its property is a constant; (2) the lengh and wide of sample is 8-10 times the thickness, that is sample is semi-infinite and have consistent start temperature; (3) constant power heat source plane; (4) the heat capacity of heater is zero.

11. . the hardware of system hardware includes sensor, preamp circuit, channel control circuit, analog-to-digital conversion circuitry, keyboard display and control circuits, printer driver and control circuits, single-chip system, system monitoring and back-up protection circuit, system and heater power supply power, heater, sample folder cards and so on.

12. It can use AD590 integrated temperature sensor to compensate the thermocouple cold junction

13. The analog-to-digital conversion circuit uses high-precision double integral A / D converter.

14.  the software of system includes system management module, data computing, printer management, parameters setting, data acquisition filter, thermocouple thermoelectric power - temperature conversion, interrupt handling and clock management. It can finish all functions by combining all the parts of system management module in a certain way.