The Denki Seigyo DSPS3M-R Series Retro-Reflective Photoelectric Sensors are compact industrial optical sensors designed for reliable object detection using a reflector-based sensing method.
The DSPS3M-R series integrates the transmitter and receiver inside a single housing and detects objects through interruption of reflected light from a reflector.
With a visible red LED light source, polarization filter, and stable long-distance sensing, the DPS3M-R series is ideal for conveyors, packaging machinery, robotics, and industrial automation systems.
Key Features
✔ Retro-reflective sensing principle
✔ Polarized reflector sensing technology
✔ Long sensing distance up to 3 meters
✔ Visible red LED light source
✔ PNP and NPN output models available
✔ Light ON / Dark ON selectable
✔ Potentiometer sensitivity adjustment
✔ Reverse polarity protection
✔ Short-circuit protection
✔ IP67 industrial protection
✔ Compact ABS housing design
Available Models
| Model | Output Type | Functional Principle | Sensing Distance |
|---|---|---|---|
| DSPS3M-RDP | PNP | Retro-reflective | 3 m |
| DSPS3M-RDN | NPN | Retro-reflective | 3 m |
Model Structure
Example: DPS3M-RDP
| Code | Description |
|---|---|
| DS | Denki Seigyo |
| PS | Square Photo Sensor |
| 3M | 3 meter sensing distance |
| R | Retro-reflective type |
| D | DC type |
| P | PNP output |
| N | NPN output |
Product Overview
The Denki Seigyo DSPS3M-R Series is engineered for industrial automation applications requiring:
- Stable object detection
- Compact installation space
- Long sensing distance
- High immunity against reflective surfaces
The polarized reflector sensing system improves detection reliability in industrial environments.
Technical Specifications
General Specifications
| Parameter | Specification |
|---|---|
| Functional Principle | Retro-reflective photoelectric sensor |
| Sensing Range | 0.05 – 3 m |
| Maximum Range | 4 m |
| Polarization Filter | Yes |
| Light Source | Visible Red LED |
| Wavelength | 650 nm |
| Adjustment | Potentiometer |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | 10 – 30V DC |
| Ripple | ±10% |
| Current Consumption | ≤ 30 mA |
| Output Current | ≤ 100 mA |
| Response Time | < 0.6 ms |
| Switching Frequency | 1000 Hz |
| Protection | Reverse polarity / Overcurrent / Short circuit |
The fast switching response ensures reliable detection in high-speed automation systems.
Output Specifications
| Model | Output |
|---|---|
| DSPS3M-RDP | PNP |
| DSPS3M-RDN | NPN |
Switching Modes
- Light ON
- Dark ON
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Housing Type | Rectangular |
| Housing Material | ABS / PC |
| Front Screen | PMMA |
| Connection | 3-wire cable, 2 m |
| Cable Material | PVC |
Compact Dimensions
| Parameter | Specification |
|---|---|
| Width | 12 mm |
| Height | 31.5 mm |
| Depth | 21 mm |
The slim compact housing is ideal for tight machine installation spaces.
Environmental Specifications
| Parameter | Specification |
|---|---|
| Protection Rating | IP67 |
| Operating Temperature | −25°C to +55°C |
| Storage Temperature | −40°C to +70°C |
| Humidity | 35–85% RH |
Designed for reliable operation in dusty and industrial environments.
Indicators & Adjustment
| Indicator | Function |
|---|---|
| Green LED | Power ON |
| Yellow LED | Output status |
Adjustment Functions
- Sensitivity adjustment potentiometer
- Light/Dark operation selector
Connection Diagram
PNP Output (DSPS3M-RDP)
| Wire Colour | Function |
|---|---|
| Brown | +V |
| Blue | 0V |
| Black | Output |
NPN Output (DSPS3M-RDN)
| Wire Colour | Function |
|---|---|
| Brown | +V |
| Blue | 0V |
| Black | Output |
Recommended Reflector
| Reflector Model | Type |
|---|---|
| DS-RF250 | Standard reflector |
Applications
Denki Seigyo DSPS3M-R Series sensors are suitable for:
• Conveyor object detection
• Packaging machinery
• Industrial automation systems
• Material handling equipment
• Robotics
• Presence detection
• Production line monitoring
Accessories
| Accessory | Description |
|---|---|
| Reflector | Standard reflector included |
| Mounting Bracket | Stainless steel mounting bracket |
| Sensor Cable | 3-wire cable |
Why Choose Denki Seigyo DSPS3M-R Series?
✔ Reliable reflector-based detection
✔ Compact and easy installation
✔ Stable sensing with polarization filter
✔ Industrial-grade protection
✔ High-speed response performance
✔ Cost-effective automation solution
Ordering Information
| Model | Output | Distance | Type |
|---|---|---|---|
| DSPS3M-RDP | PNP | 3 m | Retro-reflective |
| DSPS3M-RDN | NPN | 3 m | Retro-reflective |
What is DSPS3M-RDP sensor used for?
It is used for reliable object detection in conveyors, packaging machines, and industrial automation systems.
What is the sensing distance of DSPS3M-R series?
The sensor provides sensing distance up to 3 meters.
What output options are available?
The series is available in both PNP and NPN output models.
Does the sensor require a reflector?
Yes, the DSPS3M-R series uses a reflector-based retro-reflective sensing principle.
Is the sensor suitable for industrial environments?
Yes, the sensor features IP67 protection and durable industrial housing.
