Industrial Sensors: Proximity, Photoelectric & Temp China
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Industrial sensors from China — inductive proximity, photoelectric, and temperature/humidity — are specified by output interface and ingress rating before anything else: NPN/PNP or IO-Link for proximity, RS-485 Modbus RTU or 4-20mA analog for process sensors, and IP65/IP67 housings for the factory floor. Inductive proximity sensors come in M8–M30 barrel sizes with OEM pricing that can start around $3.50, while photoelectric sensors split into through-beam (up to ~30m), retro-reflective (~8m), and diffuse modes. The output type is what decides whether the sensor drops into your existing PLC wiring without a converter.
When you source industrial sensors, match the electrical output (NPN vs PNP, sinking vs sourcing) to your PLC input cards, because a wiring-standard mismatch means every sensor needs an interface module. The common pitfall is buying on barrel size and price while ignoring switching distance and repeatability, which determines whether the sensor actually triggers reliably in the application.
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FAQ
What output interfaces do Chinese industrial sensors offer?
Proximity sensors commonly offer NPN or PNP digital outputs and increasingly IO-Link; process sensors like temperature/humidity offer RS-485 Modbus RTU or 4-20mA analog. Pick the one your PLC or controller expects to avoid adding signal converters.
What IP rating do factory-floor sensors need?
IP65 handles dust and washdown jets, while IP67 adds temporary immersion protection — common for coolant or wet environments. Confirm the rating covers the cable gland and connector, not just the sensor body.
How do photoelectric sensing modes differ?
Through-beam uses separate emitter and receiver for the longest range (around 30m) and highest reliability; retro-reflective uses a reflector for moderate range (around 8m); diffuse reflects off the target itself for short range. Choose by distance and target reflectivity.
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