Process measuring device for measuring physical or chemical quantities, such as pressure or flow used in process automation and process technology, has measuring unit for converting non-electrical quantity into electrical measurement signal

摘要

The process measuring device has a measuring unit (1) for converting a non-electrical quantity (2) into an electrical measurement signal (3). A signal preprocessing unit (5) preprocesses and digitizes the measurement signal to a digital signal (9). A signal processing unit (10) processes the digital signal by a signal processing software to a measurement value (11). The signal processing software detects the digital signal by multiplication (18) with a reference signal (19) at twice or half the modulation frequency.