Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

5 Things about IP Classed in Rugged Embedded Computing

275 views

Published on

Far away from protected server rooms or automation lines in air-conditioned production halls, embedded computers need to withstand the toughest conditions in modern vehicles and moving machines, or in outdoor installations such as railway lines.
This presentation answers questions on how to develop sealed enclosures according to the required IP classes, which materials should be selected and in which applications these requirements are particularly important.

Published in: Technology
  • Be the first to comment

  • Be the first to like this

5 Things about IP Classed in Rugged Embedded Computing

  1. 1. Textmasterformat bearbeiten ▪ Second Level ▪ Third Level ▪ Fourth Level Fifth Level February 1, 2018 5 Things to Know about IP Classes in Rugged Computing
  2. 2. 2 Batten Down the Hatches Far away from protected server rooms or automation lines in air-conditioned production halls, embedded computers need to withstand the toughest conditions in modern vehicles and moving machines, or in outdoor installations such as railway lines. This presentation answers questions on how to develop sealed enclosures according to the required IP classes, which materials should be selected and in which applications these requirements are particularly important. 1: What are common IP classes in embedded? 2: How to realize sealed housings? 3: Which role does the right connector play? 4: Is the housing completely airtight even in the highest IP class? 5: Where does the waste heat go?
  3. 3. What are Common IP Classes in Embedded? IP classes are always made up of two digits. The first stands for protection against foreign bodies (such as dust) and solids; the second stands for protection against liquids. Typical examples for embedded requirements are: ▪ IP54 – boxes or panel PCs for all outdoor applications ▪ IP65 – box PCs or panel PCs for railways, modules for medical ▪ IP67 – extremely rugged applications, like mining machines, agriculture vehicle with chemical influences… Higher IP classes can be achieved by casting the entire housing – except for a cover with connector plugs – from a single mold. Dust Liquids 0 No protection 0 No protection 1 Solid object greater than 50mm (hand) 1 Vertically falling drops of water (e.g. condesation) 2 Solid object greater than 12,5mm (finger) 2 Direct sprays of water up to 15 degrees from vertical 3 Solid object greater than 2,5mm 3 Direct sprays of water up to 60 degrees from vertical 4 Solid object greater than 1mm 4 Water sprayed from all directions, limited ingress 5 Dust protected, limited ingress of dust 5 Low-pressure jets of water from all directions, limited ingress 6 Dust tight, zero ingress of dust 6 Strong jety of water from all directions, limited ingress (e.g. ship‘s deck) 7 Temporary immersion between 15cm and 1m 8 Long period of immersion under pressure 9 High pressure, high temperature jets of water from multiple directions
  4. 4. How to Achieve Sealed Housings? ▪ To achieve i.e. IP65 class with complete protection against dust ingress and protection against water jets, a 8 mm-thick aluminum housing (a wall thickness of 2 mm suffices for standard box PCs) is recommended, which seals the PC on all sides with screws and silicone-filled contours. The thickness of the housing walls and the number and position of the screw fittings determine the contact pressure that can later be applied to the housing without the contact on the touch points and therefore the impermeability being lost. ▪ EMC protection can be achieved through conductive silicone material with silver particles.
  5. 5. lhhWhich Role Does the Right Connector Play? ▪ For all interfaces used, the plug connection, along with the connecting cables themselves, must be sealed in such a way that it also conforms to the IP class. ▪ Typical industrial interface connectors such as USB, DisplayPort or RJ45 are available in many sealing classes – but cost up to 10 times more than usual robust connectors for harsh environments ▪ This usually results in M12 connectors, which can be sealed up to IP76 and even work reliably under severe impacts and vibrations ▪ The pin assignment must be defined by the manufacturer. Also the appropriate adapter cables need to be well chosen (e.g. due to the high speed of USB 3.0, cables should contain twisted pairs)
  6. 6. Is the Housing Completely Airtight Even in the Highest IP Class? Even if the required protection class is achieved by means of the later contact pressure and surrounding seals on all points of contact, the box will still never be completely airtight. This is a decisive criterion in which pressure compensation plays a key role. Due to thermal expansion and contraction of the materials caused by temperature fluctuations (or equally by altitude differences in aviation), small amounts of air would be sucked in through the seals, thus bringing moisture into the interior of the housing from where it can no longer escape. To prevent this, a pressure compensation valve can be installed on the rear of the housing. This ventilates the housing just enough to allow condensation to be kept to a minimum.
  7. 7. Where Does the Waste Heat Go? Tightly sealed embedded systems inevitably raise the issue of heat dissipation. If there is merely a small valve ensuring pressure compensation – and thus virtually no air circulation – how can the electronics be cooled? The solution is conduction cooling, which is also the reason why a heat-conducting aluminum housing is used in all robust designs. For this reason, it is essential that components that produce heat are thermally connected to the housing, as a result the device itself becomes the heat sink. This technology is not limited to box PCs – it can also be implemented with 19" components (CompactPCI / CompactPCI Serial) or COM Express modules (Rugged COM Express). ➢ Read the full article about IP classes in rugged computing ➢ Check out our rugged product range
  8. 8. www.men.de/competencies/rugged-computing/ www.menmicro.com/competencies/rugged-computing/ www.men-france.fr/competencies/rugged-computing/

×