The term "conformal coating" refers to the coating of electronic modules. This coating provides protection against extreme moisture, corrosive gases and aggressive dust, or combinations thereof. Furthermore, the coating layer also offers mechanical protection against inappropriate handling and external influences. Conformal coating extends the lifetime of your devices in case of harsh environments.
SIPROTEC devices already feature a high degree of availability and long lifetime, even without additional coating. This is demonstrated by more than 1.6 million devices in operation worldwide. During the phase of product design, highest priority is given to fulfilling the relevant product standards, and compliance is proven by type tests, e.g. damp heat cycle tests according to IEC 60068-2-30, involving exposure to mixed gases, sulfur dioxide SO2 or hydrogen sulfide H2S.
The new coating feature provides an additional level of protection for SIPROTEC devices used in extremely harsh environmental conditions, such as:
In extreme cases, these influences may cause short-circuits or circuit breaks on the board and lead to restricted device functionality or failure.
In this process, the SIPROTEC device is subjected to several test complexes.
In the course of test complex A, for example, the device is first exposed to corrosive gases and afterwards to damp heat. In contrast to single tests with different specimen, this combined approach simulates maximum harsh environmental conditions.
Test complex A:
Corrosive and climatic tests
Test complex B:
Climatic and mechanical-dynamic tests
Test complex C:
Test complex D: Salt mist test
SIPROTEC devices with conformal coating
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