AUTOMATIC SYSTEM FOR MONITORING A PHYSICAL QUANTITY

摘要

System for automatically monitoring a physical quantity by periodic sampling wherein the interval between samplings and the duration of the samplings is varied according to a predetermined ratio each time the magnitude of the measured physical quantity transgresses a threshold value. A timer is provided with individual cams for periodically controlling the sampling interval and the measuring interval and a timer motor drives the cams at a controllable speed. A control arrangement having the threshold values stored therein monitors the measured values and adjusts the speed of the timer motor by a factor k each time the measured value transgresses a threshold value, thereby adjusting both the sampling time and the measuring time of the system.