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'Load dump' inductive sensors

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article image Turck’s new ‘load dump’ inductive sensors.

TURCK, represented by Micromax , has developed the new 'load dump' sensor to solve application problems in large vehicles that use battery operated systems such as lift equipment, garbage trucks, military vehicles, etc.

These applications caused problems due to high voltage transients. There were some solutions available, but they were not always the most reliable and could be very expensive.

Turck chose to develop this sensor and test it with an outside testing laboratory to meet existing specifications to ensure the sensor would perform as required given the needed protection in this unique application.

The technical name for this type of sensor is "Immunity to Conducted Transients On Power Leads". They have been tested and meet the SAE-J1113-11 specs.

The tests for SAE-J1113-11 were developed to provide measurable and repeatable test measurements to determine the susceptibility of electrical transients, particularly along battery feed and switched ignition, generated in those systems.

Switching devices such as relays, intermittent alternator/generator switching or battery to load switching can cause very high transients up to 600 volts for durations of up to half a second.

The energy in these transients is often enough to damage unprotected semiconductor devices (like proximity sensors). The tests were established for both 12 volt and 24 volt systems.

There are five basic pulses in these tests of which Pulse 1 and Pulse 5A are the most severe. Turck 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.

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