Thermal conductivity system LAMBDA

The Thermal conductivity system LAMBDA

The LAMBDA system is a compact, operator-friendly measuring instrument that facilitates a fast determination of 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 your dispersions of nanoparticles (nano-fluids). The LAMBDA can be operated in the stand-alone mode or by your WINDOWS computer via digital interface RS-232 (can be adapted to USB).

Key features

  • 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 - 300°C)
  • No unwanted influence of convection
  • Suitable for any fluid, powder or gel
  • Only small amount of sample needed (approx. 35 ml)
  • High reproducibility (98 - 99 %)
  • Short set-up time
  • Easy to operate
  • RS-232/USB connection to your WINDOWS PC for fully automatic measurement and temperature control (LAMBDA software included)
  • Optional thermostat available for automatic sample temperature control

Fields of application

For determining the thermal conductivity by means of the LAMBDA a small fluid sample of approx. 35 ml is sufficient. The sensor is simply immersed into the measuring fluid and in intervals of approx. 60 seconds the LAMBDA determines the thermal conductivity as well as the temperature of the fluid. The compact measuring instrument opens up new possibilities for the flexible application in laboratory or field:

  • Optimizing of fluid development Development of working fluids for heat transfer and isolation
  • Optimizing of fluid application Solving problems of heat transfer in process application
  • Quality control Quality control of incoming / outgoing liquids
  • Fluid analysis in the field Optimizing of service and maintenance intervals



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)
  • fluid thermostat with heat exchanger vessel for additional cooling


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)
Measuring time approx. 60 s
Optional data transfer to a computer RS232 interface
Response time ca. 60 s
Optional data transfer to a computer RS232 interface
Display LCD
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 measuring 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