EKO Thermal Conductivity Tester Quick Lambda HC-10 Instruction Manual Ver. 1.0
5-2. Measurement condition
1. Conditions for measurement
Samples to be measured are homogeneous materials and are limited to samples with thermal
conductivity ranging from 0.03 to 5.0 [W/m・K].
Even substances that are not homogeneous, those made under the same conditions, such as vacuum
insulation materials can be measured. At least three VIP samples of the same construction but different
vacuum and thermal conductivity have to be prepared for this application.
The section of the sample where the sensor unit is placed must be flat.
Measure in a place where there is no air flow. Measurement error will result if air, for example, from an air
conditioner is directed at the sample.
The sample to be measured must be well suited to the ambient temperature in the room. If the ambient
temperature and the sample temperature are different, a measurement error will occur.
Foamed materials such as Styrofoam can only be measured if the bulk density is the same and only the
difference in thermal conductivity is to be observed. However, it is impossible to determine the
difference in thermal conductivity in a very narrow range by measuring samples which have the
different bulk density. Even if calibration is performed, correlation of voltage output with thermal
conductivity cannot be obtained. Therefore, in this case it cannot be measured correctly with this
device. This is because foamed materials with different bulk densities cannot meet the
"homogeneous substance" condition, which is the measurement condition of this device.
As for thin materials such as films, please stack the sample to a certain thickness before taking any
measurements. The thickness of the sample to be measured will be limited by the thermal conductivity.
Adjust the thickness of the sample by referring to the graph below. However, if air enters between the film
layers, the error will increase, so please ensure the samples are properly joined together.
Measurable