Switching devices such as relays, intermittent alternator/generator switching or battery to load switching can cause very high transients up to 600V for durations of up to 1/2 a second. The energy in these transients is often enough to damage unprotected semiconductor devices (like proximity sensors).
Recently, sensor vendor Turck announced a new range of ‘Load Dump’ sensors that can provide protection against these electrical transients.
The devices were tested by an independent testing laboratory to ensure that they met the SAE specification J1113-11, which defines a set of test measurements that determine the susceptibility of sensors to these electrical transients.
There are five basic pulses in these tests of which Pulse 1 and Pulse 5A are the most severe. The new Turck devices passed the tests in both cases.
Tests were conducted primarily, but not exclusively, on ignition and battery operated systems of mobile and stationary vehicle systems.