Product Overview
The DSP40 Series Square Inductive Proximity Sensors are designed for industrial applications requiring reliable metal detection, long sensing distances and high environmental protection.
The compact 40 × 40 mm housing combines a robust construction with a rotatable sensing head and four-sided LED indication, allowing convenient installation and easy status monitoring from different viewing angles.
The series is available with 20 mm and 40 mm sensing distances and PNP or NPN output configurations, allowing users to select the appropriate sensor according to the required detection distance and PLC/control-system interface.
Designed for harsh industrial environments, the DSP40 Series provides high resistance to vibration, dust, moisture and other environmental conditions encountered in automated production systems.
Key Features
- 40 × 40 mm compact square housing
- 20 mm and 40 mm sensing-distance options
- Inductive non-contact metal detection
- PNP and NPN output options
- DC 4-wire configuration
- Non-flush installation
- Rotatable sensing head
- 360° LED indication with four LEDs
- M12 connector
- Reverse polarity protection
- Pulsing short-circuit protection
- High switching reliability
- Excellent vibration resistance
- Quick mounting bracket
- IP68 / IP69K environmental protection
- Heavy-duty industrial construction
Product Highlights
Multiple Sensing Distances
The DSP40 Series is available in 20 mm and 40 mm sensing-distance versions, providing flexibility for different machine and automation applications.
PNP and NPN Output Options
Both PNP and NPN output variants are available, making the series suitable for different PLC and industrial control architectures.
40 × 40 mm Industrial Housing
The square housing provides a large sensing face while maintaining a compact form factor for machine installation.
Rotatable Sensing Head
The sensing head can be rotated to simplify installation, sensor alignment and cable routing.
360° LED Indication
Four LED indicators provide visibility around the sensor, allowing operating status to be monitored from different directions.
M12 Connector
The M12 connection provides a secure and convenient interface for industrial wiring and maintenance.
IP68 / IP69K Protection
The sensor is designed for demanding environments where protection against dust, water and washdown conditions is important.
Available Models
| Model | Output | Sensing Distance | Connection |
| DSP40-20DP-C | PNP | 20 mm | M12 Connector |
| DSP40-40DP-C | PNP | 40 mm | M12 Connector |
| DSP40-20DN-C | NPN | 20 mm | M12 Connector |
| DSP40-40DN-C | NPN | 40 mm | M12 Connector |
Model Code Structure
Example: DSP40-40DP-C
| Code | Description |
| D | Denki Seigyo |
| SP | Square Proximity Sensor |
| 40 | 40 × 40 mm Housing |
| 20 / 40 | Sensing Distance in mm |
| D | DC Supply |
| P | PNP Output |
| N | NPN Output |
| C | M12 Connector Type |
Model Examples
DSP40-20DP-C
40 × 40 mm housing + 20 mm sensing + DC + PNP + M12
DSP40-40DP-C
40 × 40 mm housing + 40 mm sensing + DC + PNP + M12
DSP40-20DN-C
40 × 40 mm housing + 20 mm sensing + DC + NPN + M12
DSP40-40DN-C
40 × 40 mm housing + 40 mm sensing + DC + NPN + M12
Technical Specifications
General Specifications
| Parameter | Specification |
| Sensor Type | Inductive Proximity Sensor |
| Housing | Square |
| Housing Size | 40 × 40 mm |
| Sensing Principle | Inductive |
| Sensing Distance | 20 mm / 40 mm |
| Installation | Non-flush |
| Standard Target | Iron (Fe) |
Electrical Specifications
| Parameter | Specification |
| Supply Voltage | 10–30 VDC |
| Output Type | PNP / NPN |
| Output Configuration | 4-Wire DC |
| Switching Function | Complementary |
| Switching Frequency | 180 Hz* |
| Operating Current | 200 mA Max* |
| No-load Current | ≤20 mA* |
| Voltage Drop | ≤2 V* |
| Leakage Current | ≤0.5 mA* |
| Reverse Polarity Protection | Yes |
| Short-Circuit Protection | Pulsing |
Mechanical Specifications
| Parameter | Specification |
| Housing Material | PA Engineering Plastic |
| Sensing Face | PA |
| Housing Size | 40 × 40 mm |
| Connector | M12 × 1 |
| Number of Pins | 4 |
| Mounting | Quick Mount Bracket |
| Weight | Approx. 155 g* |
Environmental Specifications
| Parameter | Specification |
| Operating Temperature | –25°C to +85°C |
| Storage Temperature | –40°C to +85°C |
| Protection Rating | IP68 / IP69K |
| Shock Resistance | Industrial Grade |
| Vibration Resistance | High |
LED Indicators
| Indicator | Function |
| Green LED | Power ON |
| Yellow LED | Output Status |
| LED Visibility | 360° – 4 LEDs |
Reduction Factors
| Material | Correction Factor |
| Iron | 1.00 |
| Stainless Steel | 0.74 |
| Brass | 0.39 |
| Aluminum | 0.31 |
| Copper | 0.30 |
Typical Applications
The DSP40 Series can be used for reliable metal-object detection in:
- Conveyor Systems
- Material Handling Equipment
- Warehouse Automation
- Steel Industry
- Packaging Machines
- Robotics
- Machine Tools
- Automotive Manufacturing
- Logistics Systems
- Heavy Industrial Automation
- Factory Automation
- Production Machinery
- Machine Safety and Position Detection
Why Choose Denki Seigyo DSP40 Series?
Flexible Model Selection
Choose between 20 mm and 40 mm sensing distances and PNP or NPN output configurations according to the application.
Heavy-Duty Protection
IP68/IP69K protection makes the sensor suitable for demanding industrial environments.
Flexible Installation
The rotatable sensing head allows easier sensor positioning and alignment.
Easy Connectivity
The M12 connector simplifies installation and maintenance.
Clear Status Indication
360° LED indication allows operating status to be viewed from multiple directions.
Reliable Industrial Detection
The inductive sensing principle provides non-contact detection of metallic targets without mechanical wear.
Frequently Asked Questions
What is the DSP40 Series?
The DSP40 Series is a 40 × 40 mm square inductive proximity sensor series for non-contact detection of metallic objects.
What sensing distances are available?
The series is available in 20 mm and 40 mm sensing-distance variants.
Which output types are available?
The DSP40 Series is available with PNP and NPN outputs.
What are the available models?
The available models are:
- DSP40-20DP-C
- DSP40-40DP-C
- DSP40-20DN-C
- DSP40-40DN-C
What does the P and N mean in the model number?
P indicates the PNP output version, while N indicates the NPN output version.
What does C mean in DSP40-40DP-C?
C indicates the M12 connector version.
What is the housing size?
All DSP40 Series models use a 40 × 40 mm square housing.
Is the DSP40 Series flush or non-flush?
The existing DSP40 specification identifies the sensor as non-flush installation.
Does the sensor have an adjustable sensing head?
Yes. The DSP40 design incorporates a rotatable sensing head for flexible installation.
What is the protection rating?
The DSP40 Series has IP68 / IP69K protection according to the existing product specification.
Does it use an M12 connector?
Yes. The DSP40 Series uses an M12 connector for electrical connection.
Product Summary
The Denki Seigyo DSP40 Series Square Inductive Proximity Sensor combines a robust 40 × 40 mm housing, flexible sensing-distance options, PNP/NPN output configurations, rotatable sensing head, 360° LED indication, M12 connectivity and IP68/IP69K protection.
With 20 mm and 40 mm sensing options and both PNP and NPN variants, the DSP40 Series provides a flexible solution for metal detection in industrial automation, conveyors, packaging machinery, machine tools, automotive manufacturing, robotics and material-handling systems.
