Product description
Inductive Proximity Sensor with NPN Open Collector Output. Inductive proximity sensor designed to detect the presence of metallic objects within 5 mm of the sensor surface. The detection distance may vary slightly depending on the shape, size, and type of metal. The sensor can also detect through thin, non-metallic materials. A built-in red LED is illuminated when the sensor is powered, and increases in brightness when an object is detected. The sensor operates at 12 VDC and features an NPN open collector output.
This sensor is well-suited for detecting moving objects, machine motions, door open/close events, and more. Compared to optical sensors, it operates reliably in humid or dusty environments without false triggering.
Specifications:
- Detection distance (max): 5 mm
- Output signal: NPN open collector
- Supply voltage: 10–30 VDC
- Current consumption (max): 5 mA
- Cable length: 1 meter
- Status indicator: Red LED
- Protection: IP67
- Operating temperature: -25 to +75 °C
Wiring:
- Brown wire: +VCC
- Blue wire: GND
- Black wire: Signal OUTPUT
Output with NPN open collector:
An open collector is a type of output circuit commonly used in sensors, digital logic circuits, and interface applications. Instead of driving the signal both high and low, it functions as a switch to ground (GND):
When the output is active, the transistor conducts to ground, and the signal goes low (0 V).
When the output is inactive, the transistor is open, meaning the signal is floating (no defined voltage).
To obtain a clear high level, a pull-up resistor must be connected between the output and a chosen voltage (for example 5 V or 12 V, depending on the system). The resistor pulls the signal high when the transistor is open.
Advantages:
- The output voltage level can be chosen independently of the sensor’s supply voltage.
- Multiple open collector outputs can be connected together for a so-called wired-AND function.
- A robust and simple solution for interfacing with different logic levels.
