1overview
Used to measure the thermal conductivity of various homogeneous board shaped insulation materials and materials with poor thermal conductivity. The measuring instrument adopts a microcomputer automatic control system, which has the advantages of automatic control of the experimental process, automatic completion of data acquisition, and generation of reports, with a high degree of intelligence. It is currently the ideal choice for conducting such testing projects in China.
IITesting items
Used to measure the thermal conductivity of various homogeneous board shaped insulation materials and materials with poor thermal conductivity.
IIIprinciple
Under steady-state conditions, a one-dimensional constant heat flux similar to that existing in an infinite flat plate bounded by two parallel uniformly heated plates is established in a uniform plate-shaped specimen with parallel surfaces in the central measurement area of the protective hot plate device.
4According to the standard
GB10294-2008Determination of steady-state thermal resistance and related characteristics of insulation materials - Protective hot plate method
GB3399Test method for thermal conductivity of plastics - Thermal protection plate method
5Technical Parameter
5.1Model:PDR300
5.2External dimensions(longxwidextall)：
PDR300：1020x650x1480(mm)
5.3Specimen specifications:
PDR300：(metering)150x150(mm)-(protection)300x300(mm)
5.4Test piece thickness:
PDR300According to national standards ≤37.5(mm)Clamping thickness ≤50(mm)
5.5Measurement range of thermal conductivity:0.0100~2.0000W/(m.k)
5.6Cold plate temperature:3℃~90℃
5.7Hot plate temperature: ≤120℃
5.8Test accuracy: ≤±2％
5.9Test repeatability: ≤±1％
5.10Equipped with power:3Kw 220V
VITest device structure
Adopting the dual specimen protection hot plate method(GB10294-2008),It consists of a microcomputer automatic control system, a metering heating unit, a cold plate unit, a protective unit, an external protective unit, a measurement system, a compression system, a refrigeration mechanism, etc.
6.1、Microcomputer automatic control system
The computer output signal is processed throughI/OandD/AConvert and control the corresponding execution components to achieve functions such as temperature control, calculation, temperature acquisition, printing test reports, and displaying process curves. The human-machine dialogue window displays the temperature values of each surface and has a self diagnostic function.
6.2、Measurement heating unit
Aluminum plate is used as the heating panel due to its high thermal conductivity, which makes the temperature of the heating panel surface more uniform and has less thermal inertia, resulting in more accurate measurement results.
6.3、Cold plate unit
Using a constant temperature water tank to control the temperature of two cold plates, the temperature of the cold plates can be set and automatically controlled by a microcomputer, which is beneficial for controlling the temperature difference on both sides to become the same.
6.4、Protective Unit
Using the same panel material as the metering heating unit, the temperature difference on both sides of the gap is precisely controlled to reduce testing errors.
6.5、External protection unit
Using a protective cover made of cork as the outer protective unit makes the experimental environment more stable and beneficial for improving testing accuracy.
6.6、measurement system
Adopting Dallas, USA with higher stability18B20Digital temperature sensors and high-precision DC power sensors make data acquisition results more accurate.
6.7、Compression system
Using pneumatic technology, the test piece is automatically compressed by a cylinder without the need for manual adjustment of compression force, making the clamping of the test piece very convenient.
6.8、Refrigeration mechanism
It can quickly reduce the temperature of the cold plate and detect the average temperature of the specimen below room temperature, making the detection range larger and not affected by environmental temperature.
