Oximeter sensor with digital memory encoding patient data

A method of using a oximeter sensor adapted for mobile use with a patient, the method comprising: - emitting light from a light emitting element (52); - Detecting light from the light emitting element (52) using a light detector element (54); - Store values ​​alarm limit in a memory device (56) in the sensor (50), in which the values ​​of alarm limit include minimum or maximum values ​​of patient data subject to monitoring by an oximeter that trigger a signal alarm; - Comparing the values ​​of limit signal stored alarm in the memory device (56) with data supervised patient, wherein data monitored patient are calculated from a signal from the light detector (54) element ; and if monitored patient data reaches one of the alarm limit values, trigger the alarm.