Thermal conductivity meter LAMBDA

The Thermal conductivity system LAMBDA

LAMBDA is a compact, operator-friendly measuring instrument that facilitates a fast determination of the thermal conductivity in a wide temperature and pressure range by means of the hot-wire method according to ASTM D7896-14. This highly accurate athermal calorimeter is suited for fluid analysis in the laboratory as well as in the field, including the measurement of thermal conductivity of nanoparticle dispersions/nano fluids. LAMBDA can be operated in the stand-alone mode or by your WINDOWS computer via RS-232 (adaptable to USB).

Key features

  • highly accurate laborytory instrument
  • wide measuring range (10 - 2000 mW/(m*K))
  • thermal conductivity and temperature are displayed
  • fast, instationary resistance measurement by means of the hot-wire method (ASTM D7896-14)
  • robust stainless steel sensor
  • wide temperature range (-50°C to 300°C)
  • no unwanted influence of convection
  • suitable for any fluid, powder or gel
  • requires only small sample amounts (approx. 35 ml)
  • high reproducibility (98 - 99 %)
  • short set-up time
  • easy to operate
  • RS-232/USB connection to your WINDOWS PC for automatic measurement and temperature control
  • functional LAMBDA software included
  • optional thermostat available for automatic sample temperature control

Easy and fast measurement

For determining the thermal conductivity with LAMBDA a small sample volume of 35 ml is sufficient. Simply immerse its sensor into the sample and in one minute interval LAMBDA will determine the thermal conductivity as well as the temperature of your fluid.

Fields of application

This compact, highly accurate instrument opens up new possibilities for the flexible application in both laboratory and field:

  • Optimization of fluid development: Improve your development of HTF, silicone oils, insulation oils, etc.
  • Optimization of fluid applications: Solve thermal problems of your application or optimize the heat transfer in your process.
  • Quality control: Check the thermal conductivity of your incoming/outgoing liquids.
  • Fluid analysis in the field: Optimize your service and maintenance intervals.

Modes of operation

Thanks to its intuitive menu LAMBDA can be operated in stand-alone mode. In addition use your PC and our powerful LAMBDA software to set up automatic conductivity measurements within a temperature range of your choice. The captured CSV-based data can be exported easily, e.g. to EXCEL, for further analysis.

 

 

Optional thermostat for sample temperature control

We also offer different suitable thermostats, which can be controlled by the LAMBDA and quickly bring whatever sample temperature you desire for your measurement:

  • dry thermostat (heater): RT to 300°C
  • fluid thermostat with heat exchanger vessel for additional cooling: -20°C to 300°C

 

Technical data

Measuring media fluids, gels, powders
Sample quantity approx. 35 ml
Measuring range 10 - 2000 mW/(m*K)
Repeatability 98 - 99%
Temperature range - sensor -50°C - 300°C
Temperature accuracy ± 0,1°C
Temperature measurement PT100
Pressure range - sensor 0 - 35 bar (optional HP version up to 10.000 bar available)
Response time ca. 60 s
Additional data transfer to computer RS-232 interface (adaptable to USB)
Display LCD (4 x 16 digits)
Dimensions electronic unit (LxWxH) 370 x 235 x 150 mm
Weight - system approx. 2,9 kg
Power supply 110 - 240 V AC, 50/60Hz
Energy consumption 15W
Outer dimensions sample vessel (screw-on cup) D = 36 mm (equals inner diameter of thermostat jacket);

L = 100 mm (equals immersion depth into thermostat)

see picture below

 

 

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The Thermal conductivity system LAMBDA