Thermoelectric assemblies for analytical and medical instrumentation

May 01, 2018 // By Nick Flaherty
Laird has expanded its line of thermoelectric assemblies (TEA) for heating and cooling analytical and medical instrumentation with 100W capability.

The trend to miniaturize analytical and medical instruments to free up precious lab space has led engineers to pack more functionality into a smaller footprint. This increases the heat flux density and thermal challenges. Waste heat must be efficiently managed to minimize heating areas requiring cooling but this needs to be offset with quieter operation to not disturb the lab technician. For systems that require refrigeration, such as incubators, centrifuges, liquid chromatography and chemical analyzers, temperature control systems play an important role in optimization of test results.

The Tunnel Series TEA now offers an expanded line of cooling capacities ranging up to 100 watts with higher efficiencies that run quieter. When combined with an advanced SR-54 Series temperature controller, the Tunnel Series TEA offers temperature control to within ±1 ºC. The SR-54 temperature controller also provides monitoring and alarm functionality to identify a problematic fan, thermoelectric module, over-temperature thermostat and temperature sensor failure, all of which are critical to maximize medical equipment uptime.

The controller requires minimal programming and can be easily attached to a TEA or system enclosure and it also lowers operational noise, as fan speeds can be lowered once the specified temperature has been reached.

The Tunnel Series use either an air-to-air or direct-to-air heat transfer mechanisms designed with optimized thermoelectric modules (TEMs) for high efficiency and brand names fans for low noise and improved reliability. Additional design features include improved sealing to prevent moisture intrusion when running below dew point conditions and reduced number of airflow paths required to operate more efficiently compared to traditional impingement flow TEAs.

"The space constraints for analytical and medical instrumentation equipment require that the thermal solution deliver precise temperature control with condensation protection in a small package. The compact Tunnel Series TEA not only meets size requirements, but also offers faster temperature ramp rates, better efficiency and lower noise operation," said Anders Kottenauer, Senior Vice President of Laird's Thermal Systems Business. 


s