Long Distance Industrial Photo Sensor for Reliable Object Detection
Using a separate transmitter and receiver configuration, the DPS series achieves stable detection up to 20 meters with excellent resistance to dust, ambient light, and target surface variations.
With a compact rectangular housing, visible red LED light source, and selectable Light ON / Dark ON operation, the DPS series is ideal for conveyors, packaging machinery, robotics, and material handling systems.
Key Features
✔ Through-beam photoelectric sensing principle
✔ Long sensing distance up to 20 meters
✔ High-speed response and stable detection
✔ Compact industrial housing
✔ Visible red LED light source
✔ PNP and NPN output options
✔ Light ON / Dark ON selectable
✔ Reverse polarity protection
✔ Short-circuit protection
✔ Potentiometer sensitivity adjustment
✔ IP67 industrial protection
Available Models
| Model |
Output Type |
Sensing Principle |
Sensing Distance |
| DPS-20M-TDP |
PNP |
Through-beam |
20 m |
| DPS-20M-TDN |
NPN |
Through-beam |
20 m |
Model Structure
Example: DPS-20M-TDP
| Code |
Description |
| D |
Denki Seigyo |
| PS |
Square Photo Sensor |
| 20M |
20 meter sensing distance |
| T |
Through-beam type |
| D |
DC type |
| P |
PNP output |
| N |
NPN output |
Technical Specifications
General Specifications
| Parameter |
Specification |
| Functional Principle |
Through-beam photoelectric sensor |
| Sensing Distance |
0 – 20 m |
| 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 |
< 0.5 ms |
| Switching Frequency |
1000 Hz |
| Protection |
Reverse polarity / Overcurrent / Short circuit |
The high switching frequency makes the DPS series suitable for high-speed automation systems.
Output Specifications
| Model |
Output |
| DPS-20M-TDP |
PNP |
| DPS-20M-TDN |
NPN |
Switching Modes
Mechanical Specifications
| Parameter |
Specification |
| Housing Type |
Rectangular |
| Housing Material |
ABS / PC |
| Front Cover |
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 compact housing allows installation in tight machine spaces and compact automation equipment.
Environmental Specifications
| Parameter |
Specification |
| Protection Class |
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 indicator |
| Yellow LED |
Output status |
Adjustment Functions
- Sensitivity adjustment potentiometer
- Light/Dark operation selector
Connection Diagram
Transmitter
| Wire Colour |
Function |
| Brown |
+V |
| Blue |
0V |
| Black |
Not connected |
Receiver (PNP)
| Wire Colour |
Function |
| Brown |
+V |
| Blue |
0V |
| Black |
Output |
Receiver (NPN)
| Wire Colour |
Function |
| Brown |
+V |
| Blue |
0V |
| Black |
Output |
Characteristic Features
Light Spot Size
| Distance |
Spot Size |
| 0 m |
Ø 7.5 mm |
| 4 m |
Ø 130 mm |
| 8 m |
Ø 250 mm |
| 12 m |
Ø 310 mm |
| 20 m |
Ø 480 mm |
Applications
Denki Seigyo DPS Series sensors are ideal for:
• Conveyor systems
• Packaging machinery
• Industrial automation systems
• Material handling equipment
• Robotics
• Object counting and positioning
• Production line detection
Accessories
| Accessory |
Description |
| Mounting Bracket |
Stainless steel mounting bracket |
| Sensor Cable |
3-wire cable |
| Mounting Hardware |
Included |
Why Choose Denki Seigyo DPS Series?
✔ Stable long-distance detection
✔ High-speed response performance
✔ Reliable operation in industrial environments
✔ Compact and easy to install
✔ Excellent immunity to ambient light and dust
✔ Cost-effective industrial automation solution
Ordering Information
| Model |
Output |
Distance |
Connection |
| DPS-20M-TDP |
PNP |
20 m |
Cable |
| DPS-20M-TDN |
NPN |
20 m |
Cable |
