Introduction 
       Thermal conductivity is an important parameter for the assessment of the heat transfer property of materials. The thermal conductivity measurement instrument based on GHP is an absolute method especially designed for the assessment of the heat transfer property of thermal insulation materials, which are widely used in the all kinds of buildings, including civil buildings and industrial buildings, as well as other fields, such as cold chain transportation, aerospace, and oil and natural gas industries, etc..
       The D300FX serials thermal conductivity measurement instrument based on GHP has a design of holding two identical specimens, which is in accordance with the ISO 8302 and GB/T 10294. This D300FX series have a robust mechanical structure, excellent thermal insulation design, an advanced electronic controller based on micro-chips and surface mounted devices(SMD) ,  user-friendly software with graphical interface and intelligent self-calibration property. 

Properties
       ① in accordance with ISO 8302 and GB/T 10294-2008
       ② self-designed electronics based upon the most advanced micro-chips and surface mounted devices(SMD) instead of traditional industrial meters. 
       ③ PID based self-tunning function assuring the accuracy of the controlled temperature.
       ④ the heat transfer between the hot and guard plates approaches to zero by internal accurate mathematical models and the intelligent calibration method.                   
       ⑤ the test data fits well in the whole temperature range when the SRM(standard reference materials) are tested.      
       ⑥ test results at the same averaged temperatures between the hot and cold plates but different hot and cold plates temperature differences are within the specified accuracy range. 
       ⑦ applicable to plate specimens as well as powder/grain specimens.
       ⑧  test results on specimens with different thickness of the same materials are within the specified accuracy range.
       ⑨ user-friendly software with graphical interface and intelligent self-calibration property. 
       ⑩ very short test time of around 60 minutes achieved by the algorithm of automatic self-determination of whether the steady-state is achieved or not.
 
Specifications 
       Power supply：AC 220V±5%, 1.0～2.0kW 
       Thermal conductivity measurement：
              range: 0.001～2.2 W/(m·K)
              repeatability: ±1.0%                                                                         accuracy: ±2.5%
       Temp. measurement:
              range:
                     D300FX-D0: cold plate: 0～95℃，hot plate: 30～99.9℃
                     D300FX-D15: cold plate: -15～95℃，hot plate: 10～99.9℃
                     D300FX-D30: cold plate: -30～95℃，hot plate: -10～99.9℃
              resolution: 0.01℃                                                                             accuracy: ±0.1℃
       Test time:  60 minutes
       Environment: 　 
              room temp.: 22±3℃                                                                          humidity: 20～60%RH 
       Specimens: 
              lateral dimensions: 300mm×300mm                                                 thickness: 5～45  mm 
              planeness: <0.5mm 
‍       Size of the test platform: 820×610×1160mm   
       Weight: 70kg