HFM 446 Lambda Series - product brochure
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HFM 446 Lambda Series – Heat Flow Meter for Testing Insulation Materials Based on ASTM C518, ISO 8301, JIS A1412, DIN EN 12664, and DIN EN 12667 Method and Technique for the Characterization of Insulation Materials Analyzing & Testing

A Key Parameter for Improved Energy Efficiency What is the heating/cooling load of a building? How does this change with the weather and how can you improve it? How can you optimize the heat transfer from an electronic component? How do you design a heat exchanger system to achieve the required efficiency and what are the best materials to use? To answer questions like these, material properties such as thermal diffusivity and thermal conductivity must be known. NETZSCH offers various thermal conductivity testing instruments covering nearly all possible applications and temperature ranges....

The HFM is an exact, fast and easy-to-use instrument for measuring the low thermal conductivity λ of insulation materials. PRINCIPLE OF OPERATION In a heat flow meter (HFM), the test specimen is placed between two heated plates controlled to a user-defined mean sample temperature and temperature gradient to measure heat flowing through the specimen. The sample thickness L is measured by an internal thickness gauge. Alternatively, the user can enter and drive to the desired thickness, which is of . particular interest for compressible samples. The heat flow Q through the sample is measured...

HFM 446 Lambda Series dedicated to small, medium and large-sized specimens ... SmartMode – Focused on Measurement, Evaluation and Reporting The HFM software totally supports the operator with various easily understandable features including AutoCalibration, wizards, user methods and reports. Heat Flux Transducer – High Sensitivity and Accuracy Determination of the Specific Heat Capacity The dual heat flux transducers monitor the heat flow to and from the specimen. For calibration of the sensors, a reference material is used with known thermal conductivity. Various calibrations can be...

equipped with great features Saving Ressources in Eco-Mode In standby, the HFM 446 Lambda can be switched to the energysaving Eco-Mode or to Idle-Mode for a quick measurement start. The timing for when each mode is active can be adjusted via a scheduler.

The λ Solution Fast sample change without affecting the plate temperatures Peltier Temperature Control for Hot and Cold Plates The plate temperatures are individually controlled by bidirectional heating/cooling Peltier systems connected to an external chiller. Thanks to optimized temperature control, the highoutput Peltier elements accomplish thermal equilibrium and data sets within a short time – a productivity increase for your laboratory. Three thermocouple positions in the lower and upper plates Motorized Plate Movement and Furnace Door The plates of the HFM 446 Lambda can be separated...

Measuring the thermal conductivity of compressible materials at variable density Variable Load – control of thickness and density of compressible samples The operator can define a contact force of up to 850 N (HFM 446 Lambda Small) or 1930 N (HFM 446 Lambda Medium and Large). This enables control of the thickness, and thus density, of compressible materials. It also ensures that the plates make intimate contact with the specimen across the entire surface in order to produce minimal and uniform contact resistance – two necessary requirements for obtaining reproducible thermal conductivity...

Materials beyond the routine capability of the HFM method can be tested by insertion of additional thermocouples and rubber interface pads – eliminating the impact of interface resistance for low thermal resistance and accordingly higher thermal conductivity materials. Improved Measurement Precision for Rigid Specimens with Low Thermal Resistances The HFM 446 Lambda series can be equipped with an optional instrumentation kit* that expanding its range to lower thermal resistances (down to 0.02 (m2·K)/W) like concrete, wood products, brick, etc. The optional kit includes thin, compressible...

The instrument is delivered calibrated and a reference specimen is optionally included for verification. Of course, the list of available reference materials can be extended by the operator. ACCESSORIES AND MORE Pre-calibrated with Certified Reference Materials The HFM system is delivered calibrated with an NIST-certified or IRRM reference standard of known thermal conductivity. This establishes precise correlation between the signal output of the transducers and the actual heat flow. Thermal resistance and thermal conductivity are determined once the userdefined stability criteria are met....

Software Interface Highest Usability Calibration in Next to no Time Wizards and Methods Guide You to the Results SmartMode is the user-friendly, smoothly running user interface of the HFM Proteus® software. It is characterized by a logical structure which quickly gives a clear overview of the current measurement status and provides various report and export possibilities. After completing the test, all relevant results can be directly printed out by the integ ated printer or a report r can be created by the software when a PC is connected. For calibration purposes, the thermal conductivity...

Printout of the results obtained by the integrated printer Complete QA Documentation – Just a Click Away Setup & Control The button “Reports” allows for reports to be generated quickly and easily by granting access to various templates; one of these templates meets all of the requirements stipulated by ASTM C518. Each report can be adapted to the customer‘s own corporate identity. In addition, data can easily be exported into either Word or Excel format with just a few mouse clicks. The “Full” export button exports data, graphs and results together into a single file. Measurement data is...

Performance & Applications Performance Checked on EPS Material The upper figure shows that the thermal conductivity of NETZSCH EPS measured for 10 different specimens with the dimensions of 600 mm x 600 mm x 25 mm (HFM 446 Lambda Large), 300 mm x 300 mm x 25 mm (HFM 446 Lambda Medium) and 300 mm x 300 mm x 25 mm (HFM 446 Lambda Small) is reproducible to within about ± 0.5%. The mean thermal conductivity (formula stored also in the software) depends on the temperature and also slightly on the specimen density (mean value 26 kg/m3). The lower figure is also evidencing the thermal...