Reliable Electronics for Harsh Environments
MEN's rugged and reliable embedded computers withstand harsh environments with extreme temperatures, shock, vibration, dust, humidity and chemical influence. MEN's electronics are designed for -40 to +85°C and dissipate heat by convection or conduction cooling.
The Need for Rugged Computing
Harsh environments as in trains, busses, aircraft, ships and other vehicles as well as in moving industrial automation or medical applications require ruggedization of the electronics. Also in smoothly conditioned fields of application it is essential to save power for the sake of the environment.
Wherever electrical power is generated, there is also power dissipation, which heats up the components. This heat needs to be transferred away to prevent them from overheating. For semiconductors there is a maximum junction temperature, above which the semiconductor ceases to work. It heavily depends on the mechanical and environmental conditions, and also on the field of application, which way is the right way to dissipate excess heat.
This is the easiest method to cool board assemblies. It is done by guiding an air flow along the surface to be cooled. While the mechanical set-up is simple, some factors may turn out to be serious drawbacks, depending on the application. With flowing air, impurities and liquids can find their way into the device, and can do damage. Complex filtering equipment can reduce this risk, but then maintenance is necessary during the device's lifecycle. Cooling fans also have a limited lifetime, and their failure may lead to a total loss of some electronic components.
This approach optimizes the thermal contact to conduct the heat from the source to the outer wall of the enclosure. This makes the enclosure itself a heat radiator. Suitable measures must be taken to minimize the thermal transfer resistance from the electronic component to be cooled to the enclosure wall. On the one hand, this is ensured by choosing the right materials. On the other hand, the boards inside the enclosure need to be placed in the right way, and the heat-conducting cooling blocks need to have such masses that optimum heat transport is guaranteed. Conduction cooling is implemented via a 100% sealed metal housing for Rugged COM Express.
Computers for Operation in Extended Temperature
MEN boards and systems are designed for the extended temperature range of -40 to +70°C (85°C). The hardware is either tested (screened) to verify their thermal behavior, or it comes with qualified components.
Shock, Vibration, Drop, Humidity, Chemicals
Rugged electronics imply safe and reliable operation of a computer board or system in harsh environments. Not only the interior components, above all the processor, need to be specifically designed for high industrial demands. To make a computer really rugged it needs a robust housing to withstand extreme climatic conditions. MEN is able to cover nearly every COTS board and even complete systems by a massive metal block to protect the electronics inside.
The Four Major Benefits of Completely Covering Electronic Parts:
- Reliable operation in a temperature range from -40 to +125 °C using conduction cooling inside the system. If required, CCA technology can be combined with passive cooling, making forced air cooling with fans superfluous.
- Protection from dust, chemicals or humidity within a sealed enclosure, also in combination with conformal coating.
- Resistance against high shock and vibration effects by having the metal block containing the electronics firmly screwed to the carrier card.
- 100% EMC protection thanks to the aluminum cover on top and all four sides, as well as the bottom cover of the carrier board.
Computers for Operation in Harsh Environments
MEN always designs and produces its boards and systems for reliable operation in rugged mobile applications. An own environmental test laboratory helps to monitor and prove the quality of the products.