Autonics BS3-U1M-P Photomicro Sensor
Autonics BS3-U1M-P Through-Beam Photomicro Sensor (PNP, Light-ON, 5 mm Gap)
Ultra-compact through-beam photomicro sensor with 5 mm sensing gap, PNP output, and high-speed 2 kHz response.
Ideal for PCB assemblies, small part detection, and precision automation.
The Autonics BS3-U1M-P is an ultra-compact through-beam photomicro sensor designed for high-precision detection of very small objects. With a 5 mm sensing gap, PNP open-collector output, and 2 kHz high-speed response, it is widely used in PCB assemblies, electronic component detection, and miniature automation mechanisms.
Key Features
Through-beam photomicro sensing
5 mm sensing distance (gap type)
PNP open-collector output
High-speed response: up to 2 kHz
Light-ON / Dark-ON selectable
Ultra-compact body for tight spaces
Built-in red operation indicator
High resistance to shock & vibration
Reliable detection of opaque objects ≥ 0.8 × 1.8 mm
Ideal for PCB and precision machinery
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | BS3-U1M-P |
| Series | BS3 |
| Sensor Type | Photomicro Sensor |
| Sensing Method | Through-beam |
| Sensing Distance | 5 mm |
| Min. Sensing Object | ≥ 0.8 × 1.8 mm (opaque) |
| Light Source | Infrared LED |
| Peak Wavelength | 940 nm |
| Response Frequency | 2 kHz |
| Output Type | PNP open collector |
| Output Mode | Light-ON / Dark-ON |
| Supply Voltage | 5–24 VDC ±10% |
| Load Current | ≤ 50 mA |
| Current Consumption | ≤ 15 mA |
| Protection Rating | IP50 |
| Operating Temperature | −20 to +55 °C |
Applications
PCB component detection
IC/lead frame sensing
Small part presence detection
Office automation equipment
Vending & ticketing machines
Precision assembly systems
What’s in the Box?
Autonics BS3-U1M-P Photomicro Sensor
Pre-wired 1 m cable (4-wire)
Instruction manual
FAQ
Q1. What does “U1” indicate in this model?
It refers to the U-type (slot) body shape.
Q2. What does “M” mean in BS3-U1M-P?
“M” indicates the indicator turns ON when light is received.
Q3. Is this NPN or PNP?
This model provides PNP open-collector output.
Q4. What kind of objects can it detect?
Opaque objects ≥ 0.8 × 1.8 mm.
Q5. Is it suitable for high-speed detection?
Yes, it supports up to 2 kHz response frequency.