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Thermal Conductivity Instrument LGH
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The Linseis LGH Guarded Heat Flow Meter can accuratly determin the thermal conductivity of a planare sample.
The instuments complies with the ASTM E1530 standard. The instrument was designed in a way that is can performe
automated tests in a temperature range up to 300°C and that its operation requires no extraordinary skills. |
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Measurement Principle
A specimen and a heat flux transducer "HFT" are sandwiched between two flat plates controlled at different temperatures, to produce a heat flow through the test stack. A reproducible load is applied to the test stack, to ensure that there is a reproducible contact resistance between the specimen and plate surfaces.
At steady state, the difference in temperature between the surfaces contacting the specimen is measured with temperature sensors embedded in the surfaces, together with the electrical output of the HFT. This output is proportional to the heat flow through the specimen, the HFT and the interfaces between the specimen and the apparatus.
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Specification
| Measuring method |
Guarded heat flow meter method
ASTM Standard E1530 |
| Temperature range |
30 to 300°C (when chiller is used)
40 to 300°C (when city water is used) |
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Measurement atmosphere |
air |
| Sample size* |
a) 50mm dia. or 50mm square X 0,1 to 15 mm thick
b) 25mm dia. or 25mm square X 0,1 to 8mm thick
The thermal resistance of a sample should be within the measuring range (5) ,therefore appropriate thickness varies depending on the thermal conductivity of the sample. |
| Thermal resistance |
a) 0.0005 to 0.03 m2k/W (0.1 to 20 W/mk)
measurement range*
b) 0.0005 to 0.012m2k/W (0.1 to 15 W/mk)
Thermal resistance = thickness/thermal conductivity
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| Accuracy |
+/- 5 % |
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