Heat flow thermal conductivity meter (HFM 446 Lambda)

1、 Instrument Introduction

Efficient use of energy

Never before in history has the theme of energy conservation and efficient utilization attracted so much attention in the economic and political fields as it does today. Industrial and academic fields around the world are discussing topics related to energy conservation and alternative energy.

In the field of thermal insulation materials, there is enormous research and market potential in areas related to effective insulation for residential and commercial buildings. People expect insulation materials to be manufactured at a high and stable quality level and put into the market under strict control of their characteristics. To ensure this, numerous relevant standards and specifications have been released internationally.

Material parameters: Thermal conductivity

For the performance assessment of insulation materials, thermal conductivity (λ value) is one of the most important factors. The thermal conductivity refers to the thickness of 1 meter and 1 meter²The amount of heat flowing through the material layer per second at a temperature difference of 1 K for a material with an area. Thermal resistance (R value) is defined as the thickness of a material divided by its thermal conductivity. The thicker the material layer through which heat flows, the greater the impedance exhibited by the material layer towards heat transfer. The reciprocal of thermal resistance is the heat transfer coefficient (U value), which is a common characteristic parameter of structural materials.

The newly launched HFM 446 Lambda thermal conductivity meter by German company Nike has established a new standardized method for measuring thermal conductivity, which can be applied in research and development as well as quality control fields. Its applicable industries and materials include expanded polystyrene (EPS), extruded polystyrene (XPS), PU hard foam, mineral wool, expanded perlite, foam glass, cork, wool, natural fiber materials, building materials including phase change materials, aerogel, concrete, gypsum or polymers, etc.

During testing, place the material to be tested between two flat plates and maintain a certain temperature gradient between them. Measure the heat flow entering and exiting the material through two high-precision heat flow sensors on the tablet. When the system reaches equilibrium, the heat flux power is constant. With the measured area and thickness of the sample known, the Fourier heat transfer equation can be used to calculate the thermal conductivity.

2、 HFM 446 Lambda - Instrument Features

• ●Thermal conductivity measurement:
  -For thermal insulation materials, polymers, phase change materials, aerogels, non woven materials, etc ..

• ●Based on the following criteria:
  - ASTM C518
  - ISO 8301
  - DIN EN 12664
  - DIN EN 12667
  - JIS A1412

• ●Supports the following two measurement methods:
  -Connect to the computer and use the powerful SmartMode software for measurement and data analysis.
  -Directly use a separate instrument with an integrated printer.

• ●Traceability and traceability of data:
  -Reference materials with factory calibration and certification (IRMM 440 and NIST SRM 1450D)

• ●The best testing conditions are:
  -The sealed testing chamber reduces the impact of the environment and minimizes the possibility of water vapor condensation.

• ●Revolutionary measurement of sample thickness and parallelism:
  -Use a dual axis inclinometer.

• ●High sample efficiency:
  -With the help of motor-driven movement of the flat plate and furnace door, interference with plate temperature can be reduced, achieving rapid sample replacement.

• ●Covering the range of thermal conductivity from low to high:
  -Expand the thermal conductivity measurement of the instrument to a wider range using external thermocouples.

• ●Measurement in actual environment:
  -Variable external load for measuring compressible materials.

• ●Save time:
  -Only a mouse click is needed to generate a complete QA document, including Lambda 90/90 calculations.

• ●Anyone can use:
  -Supports multiple operating systems and multi language interfaces.

• ●Measurement of specific heat capacity (Cp): - Based on ASTM C1784

3、 HFM 446 Lambda - Technical Parameters

• ●Measurement standards: ASTM C518, ASTM C1784, ISO 8301, JIS A1412, DIN EN 12667, EN 12664
  ●Host: Integrated printer, can be used independently
  ●The sample chamber is designed for airtightness and can be filled with blowing air
  ●Hot plate: motor-driven lifting
  ●Thermal conductivity measurement:
  -Range: Maximum 2.0 W/(m * K). (For hard samples with a thermal conductivity higher than 1.0 W/m * K, high thermal conductivity measurement accessories are required)
  -Accuracy: ± 1% .. 2%
  -Repeatability: 0.5%
  -Reproducibility: ± 0.5%
  The above performance parameters were validated using NIST SRM 1450 D (thickness 2.5 cm).
  ●Tablet temperature range: -20 ..+90 ° C (Medium version optional -30 ° C) .. + 90 °C）
  ●Small version
  -Maximum sample size: 203 x 203 mm
  -Maximum thickness of sample: 51 mm
  -Detection area: 102 x 102 mm
  ●Medium version
  -Maximum sample size: 305 x 305 mm
  -Maximum thickness of sample: 105 mm
  -Detection area: 102 x 102 mm
  ●Large version
  -Maximum sample size: 611 x 611 mm
  -Maximum thickness of sample: 200 mm
  -Detection area: 254 x 254 mm
  ●Cooling system: external, constant temperature point (within the plate temperature range)
  ●Board temperature control: Peltier system
  ●Board opening: controlled by the operator. Quick sample replacement, quick return to testing point
  ●Plate thermocouple: There are three K-type thermocouples on each of the upper and lower plates (with two additional thermocouples for high thermal conductivity accessories)
  ●Thermocouple resolution: ± 0.01 ° C
  ●Number of testing points: up to 10
  ●Variable load/contact force:
  -Small version: 0 854 N (21 kPa pressure applied to a surface of 203 × 203 mm ²)
  -Medium version: 0 1930 N (21 kPa pressure applied to a surface of 305 × 305 mm ²)
  -Large version: Approximately 1900 N (5 kPA pressure applied to 611 x 611 mm2 surface)
  → It can achieve precise load control and regulate the density of compressible materials; Based on the load sensor signal, the contact pressure is calculated by software.
  ●Thickness measurement:
  -Using an inclinometer to measure the thickness of the four corners
  -Can comply with non parallel sample surface measurement standards: ASTM C518, ASTM C1784, ISO 8301, JIS A1412, DIN EN 12667, EN 12664