FIELD: electronics.
SUBSTANCE: field device comprises a transducer, a photodetector, a display, and a display controller. Transducer controls or monitors process variable, and display shows information relating to process variable. Photodetector detects a light level. Display controller is provided with edge-triggered interrupt to switch display on and off in response to both increase and decrease of light level detected by photodetector.
EFFECT: technical result is higher efficiency of energy storage.
23 cl, 3 dwg
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