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

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.