FAQ/027 KAM-500: Why does Curtiss-Wright specify "Chassis" and not "Ambient" temperature on the datasheet?
August 18, 2014
The reason Curtiss-Wright specifies "Chassis" and not "Ambient" temperature is because
- The customer is responsible for knowing the power consumption and ensuring there is adequate heat dissipation from the KAM-500 in its installation by means of a thick metal mounting plate or heatsinks. Specifying Chassis temp makes this point clear to the customer. Otherwise customers may, for example, mount the unit to a thin metal or composite structure inside an insulated compartment.
- Ambient is not clearly defined. There is little point in specifying a module will work at "Ambient" i.e. at sea level with circulating air, 50% RH and in a temperature chamber with 15cm spacing to the walls of the chamber. In reality the unit will have to function at a very different Ambient i.e. 50,000 ft with no circulating air, 20% RH, and another hot system placed 2 cm away from it. Never the less, all KAM-500 modules are tested as part of Design Verification in a chassis in a temperature chamber, and the "ambient" temperature of the circulating air is varied from -40 C to +85 C.