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Choose a bidirectional speed sensor by defining the real rotational speed and direction monitoring task before comparing product families. Record the target or measured object, operating range, motion, mounting geometry, environment, controller interface, and acceptance test. Use the worst permitted condition rather than the easiest sample, and verify every numerical limit against the current data sheet for the exact model. A category description can identify a technology direction, but it cannot prove model-level distance, response, accuracy, ingress protection, temperature limits, wiring, or certification.
The primary task is rotation direction sensor selection by speed range and target. This article treats that phrase as one engineering decision, not as a claim that every product in a category fits the application. The boundary includes the actual target or measured object, minimum and maximum operating condition, installation geometry, control interface, environment, consequence of failure, and evidence required for approval.
A bidirectional speed sensor must produce a usable signal through startup, normal running, coast-down, reverse motion, and minimum speed where applicable. Define tooth geometry, air gap, runout, speed range, zero-speed behavior, direction requirement, pulse amplitude or logic, phase relationship, controller frequency limit, and cable noise.
