Application definition before part selection
Sick service begins by separating a simple replacement request from a controlled measurement problem. The review captures the measured medium or target, expected range, available mounting space, output signal, cable route, environmental exposure, and whether the site needs a region-specific approval. That framing keeps the team from quoting a sensor that fits the thread but misses the operating record.
The engineer then maps each candidate to the commissioning evidence the plant will need later. For a photoelectric cell, that can include background suppression notes, teach-in behavior, repeatability expectations, and M12 wiring. For an encoder, the service record can note protocol, resolution, shaft type, measuring wheel material, and the way the value will be archived by the PLC or drive system.