Model and Brand: EE SX670 – 674, a classic U-groove transmission type photoelectric switch belonging to the EE SX67 series, used for non-contact detection of object presence, positioning, or counting. II. Core Operating Principle: One side of the interior is equipped with a 940nm infrared LED emitter, while the other side features a photosensitive transistor receiver, forming a U-shaped light slot (with a slot width of 5mm). When there is no object: Infrared light directly reaches the receiving end, outputting ON (light-on). When an object is inserted into the slot, the light beam is blocked, and the output is OFF (light-blocking and disconnected); it can be switched to light-blocking ON / light-entering OFF mode. Detection object: opaque objects (metal, plastic, paper, etc.) with a size of ≥2×0.8mm. III. Key electrical parameters: Power supply: DC 5–24V (wide voltage compatibility). Output: NPN open collector, maximum load 100mA. Response speed: ≤1ms, response frequency 1kHz, suitable for high-speed counting. Operating temperature: -25℃ to +85℃. Protection level: IP40 (connector type) / IP50 (conductor type), dust and splash proof. Indicator light: The red light is on when light enters, facilitating debugging. IV. Main functions 1. Object presence detection: Detect whether there is an object (such as paper, label, workpiece) inside the U-shaped slot.
In-place/limit detection: equipment limit, origin positioning, material level detection.
Counting and speed measurement: Cooperate with the blocking plate to achieve high-speed counting and motor speed monitoring.
Broken wire/stall detection: Alarm for broken material/stall of conveyor belts, wires, and chains.
Automatic door/limit control: door switching and safety protection detection for small equipment. V. Structure and Wiring Structure: U-shaped slot, 5mm wide; connector type (4 pins) or wire lead-out type (3 wires: V+, GND, OUT). Wiring: oV+: Connect to the positive terminal of DC 5–24V. oGND: Connect to the negative terminal of the power supply. OUT: NPN output, connect load (relay, PLC input) to GND. VI. Typical application scenarios for office equipment: presence or absence of paper, paper feed detection for printers/copiers. Industrial control equipment: assembly line workpiece counting, in-place detection, limit switch. Home appliances / vending machines: product detection, material level monitoring, door status detection. Electronic equipment: Tape/floppy disk in place, core position detection.
Characteristics and Advantages: Non-contact detection: no mechanical wear, long lifespan, and high reliability. High-speed response: 1kHz frequency, suitable for dynamic detection. Wide voltage supply: DC5–24V, compatible with most control systems. Strong anti-interference capability: infrared light, built-in voltage regulation and short circuit protection. Easy to install: small size (about 2.3g), fixed with M3 screws, just align the slot.
Common Model Differences (EE-SX67 Series) EE-SX670: NPN output, standard type, with switchable light-on/light-off. EE‑SX670P: PNP output, compatible with PLC positive input. EE‑SX671/672: Different slot widths/installation dimensions, suitable for narrow slots or special installations.
