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Fill level measurement in oil temperature sensors (OTS)

After the oil has been filled by a dispenser machine, an ILD1420-200 measures the level. If this is less than 4 mm or if the sensor was not filled at all due to production errors, it is evaluated as NOK and sorted from the production line. Since the oil temperature sensors have a very narrow inner diameter of only 4 mm and a depth to be tested of 28 mm, a measuring range of 200 mm is used. This ensures that the laser can reliably measure into the filling tube.