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DPB-0420-NPN-NC Front Ultra-Thin Safety Light Curtain Industrial Area Sensor
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DAPPRA DPB-0420-NPN-NC is a 4-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain with 20 mm optical axis pitch and 60 mm protection height. Separate emitter and receiver units, 14.5 × 28 mm front ultra-thin housing, 100 mm total height, NPN NC output, ≤5 ms response time, IP65 protection, TYPE 4 safety level, ideal for compact machines and space-constrained automation equipment.
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✦ Front Ultra-Thin Industrial Area Sensor
Safety Light Curtain
NPN NC
IP65
DPB-0420-NPN-NC
Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain · 4-Beam · 20 mm Pitch · 60 mm Protection Height
The DAPPRA DPB-0420-NPN-NC is a four-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment.
It uses separate EMITTER and RECEIVER units to provide a 60 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
Its 14.5 × 28 mm front ultra-thin housing saves installation space for compact machines and confined automation equipment, supporting reliable multi-beam detection in space-limited installations.
Primary Product Classification: Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain.
Related Industry Terminology: Area Sensor / Light Curtain Sensor / Safety Light Curtain.
Product Overview
DAPPRA DPB-0420-NPN-NC is a four-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment. It uses separate EMITTER and RECEIVER units to provide a 60 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
The DPB Series uses Multiple Parallel Beam Through-Beam Detection Technology and provides different beam quantities, optical-axis pitches and protection heights for compact automation equipment, machinery protection, personnel protection, access detection and object detection applications.
The DPB-0420-NPN-NC is suitable for personnel detection, machine access detection, machine protection and object detection.
DPB-0420-NPN-NC Key Features
- Front Ultra-Thin Design
- 14.5 × 28 mm Housing Cross Section
- 4 Optical Beams
- 20 mm Optical-Axis Pitch
- 60 mm Protection Height
- 100 mm Total Height
- ≤5 ms Response Time
- 0.1–3 m Detection Distance
- NPN Normally Closed Output
- DC24V ±20% Working Voltage
- IP65 Protection Rating
- Line Synchronization
- TYPE 4 Safety Level
- 2 m Signal Connection Cables
- Top & Bottom Bracket Mounting
Front Ultra-Thin Housing Design
The DPB Series uses a front ultra-thin housing design with a confirmed cross section of 14.5 × 28 mm. This housing profile allows the sensor to be installed on compact machines and confined automation equipment where standard-sized sensors would not fit.
The aluminum alloy housing supports reliable multi-beam detection while maintaining TYPE 4 safety level characteristics, complete self-checking diagnostics and strong electromagnetic interference resistance.
The DPB Series focuses on achieving a balance between ultra-thin installation, optical detection reliability and industrial durability.
Product Specifications
| Parameter | DPB-0420-NPN-NC |
|---|---|
| Product Series | DPB Series |
| Product Type | Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain |
| SKU | OL08 |
| Optical Beam Quantity | 4 Beams |
| Optical-Axis Pitch | 20 mm |
| Protection Height | 60 mm |
| Total Height | 100 mm |
| Housing Cross Section | 14.5 × 28 mm (Front Ultra-Thin) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m |
| Working Voltage | DC24V ±20% |
| Output | NPN |
| Signal Logic | NC (Normally Closed) |
| Protection Rating | IP65 |
| Housing Material | Aluminum Alloy |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Cable Length | 2 m (Standard) / Custom Available |
| Mounting | Top & Bottom Brackets (M4 Screws) |
Optical Detection Structure
The DPB-0420-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 4 optical beams are arranged with a 20 mm optical-axis pitch, providing a 60 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and provides the corresponding NPN NC output.
Area Sensor vs Safety Light Curtain
The terms Area Sensor and Safety Light Curtain are commonly used in industrial automation to describe multi-beam photoelectric detection products, but they may represent different technical and safety requirements depending on the application.
An Industrial Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes.
A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPB-0420-NPN-NC combines multi-beam infrared detection with a front ultra-thin design, making it suitable for personnel detection, object detection, access detection and machine protection applications in space-limited installations.
Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain
Fast ≤5 ms Response
With a response time of ≤5 ms, the DPB-0420-NPN-NC provides fast detection for applications requiring rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver, the system improves resistance to optical interference while supporting stable multi-beam detection.
IP65 Protection for Industrial Environments
The DPB-0420-NPN-NC features an IP65 protection rating with an aluminum alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The DPB Series operates on a DC24V ±20% power supply with protection against power overvoltage, reverse polarity and output overcurrent.
NPN Normally Closed Output
The DPB-0420-NPN-NC uses an NPN Normally Closed (NC) output configuration for connection with compatible industrial control systems. NPN NO, PNP NC and PNP NO output options are also available within the DPB Series.
DPB-0420-NPN-NC Model Information
The model number identifies the DPB Series configuration, beam quantity, optical-axis pitch, output type and signal logic.
Model Code
DPB
-
04
20
-
NPN
-
NC
DPB
Series prefix — DAPPRA DPB Series Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain.
04 — Beam Quantity
Number of optical beams. This model uses 4 optical beams.
20 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 20 mm beam spacing.
NPN — Output Type
Output transistor type. This model uses NPN transistor output.
NC — Output Logic
NC = Normally Closed; NO = Normally Open. This model uses Normally Closed logic.
Field
Meaning
Value
DPB
Series prefix
DPB
Beam Quantity
Number of optical beams
04
Optical-Axis Pitch
Distance between adjacent optical axes
20 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPB-0420-NPN-NC = DPB Series, 4 beams, 20 mm optical-axis pitch,
NPN output, Normally Closed logic.
Dimensions
The DPB-0420-NPN-NC features a 14.5 × 28 mm front ultra-thin housing with a 60 mm protection height and 100 mm total height.
Key dimensions:
- Housing Cross Section: 14.5 × 28 mm
- Optical-Axis Pitch: 20 mm
- Protection Height: 60 mm
- Total Height: 100 mm
Installation Method
The DPB Series uses a top and bottom bracket mounting configuration. The emitter and receiver are fixed to the machine frame through the mounting brackets at both ends of the housing.
The 14.5 × 28 mm front ultra-thin housing provides a compact installation profile while maintaining the internal structure required for reliable multi-beam detection.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Mounting Position — Top and bottom ends of the emitter and receiver housing
- Bracket Set — Standard top and bottom mounting brackets with M4 screws, nuts, washers and spring washers
- Alignment — The emitter and receiver must be mounted parallel with the optical axes facing each other
DPB Series Model Selection
The DPB Series provides different beam quantities, optical-axis pitches and protection heights for different industrial detection and machine protection requirements.
For the DPB-0420-NPN-NC:
DPB-0420-NPN-NC → 4 Beams · 20 mm Optical-Axis Pitch · 60 mm Protection Height · 100 mm Total Height
For the complete DPB Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DPB Series page. [VIEW DPB SERIES MODEL SELECTION →]
Wiring & Controller Compatibility
The DPB-0420-NPN-NC provides an NPN normally closed output with a DC24V ±20% working voltage. The output is compatible with NPN-input PLCs, controllers or interface circuits.
Before connection, verify the input type and wiring configuration of the control system.
The DPB Series uses separate EMITTER and RECEIVER units with line synchronization for coordinated optical-beam operation.
| Electrical Configuration | Specification |
|---|---|
| Working Voltage | DC24V ±20% |
| Output Type | NPN |
| Signal Logic | NC (Normally Closed) |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Control Interface | Compatible with NPN-input PLCs, controllers or interface circuits |
Controller Options
The DPB Series can be integrated with dedicated controllers for different machine installation and control requirements.
Two controller configurations are available:
Built-in Controller
DAPPRA DSC-E220
DAPPRA DSC-E220 is a built-in controller designed for installation inside the machine cabinet. It provides power and control functions for compatible Safety Light Curtain and Industrial Area Sensor systems.
View DSC-E220 Built-in Controller →External Controller
DAPPRA DSC-G220
DAPPRA DSC-G220 is an external controller designed for use with compatible Safety Light Curtain and Industrial Area Sensor systems. It provides an external control interface for machine integration and control applications.
View DSC-G220 External Controller →One controller can manage multiple DPB sensor sets, forming multi-face protection such as one-to-two or one-to-three configurations for larger press machines.
Applications
Machine and Personnel Applications
- Machine Protection
- Personnel Protection
- Machine Area Detection
- Object Detection
- Material Detection
Automation and Equipment Applications
- Conveyor Monitoring
- Automated Equipment
- Packaging Machinery
- Cutting Equipment
- Hydraulic Machinery
- Robotic Equipment
- General Industrial Automation
FAQ
Common questions about Area Sensor technology, DPB Series selection, installation and troubleshooting.
What is an Area Sensor?
+
An Area Sensor is a multi-beam photoelectric detection device that uses parallel infrared beams between an emitter and a receiver to detect objects, personnel or access conditions across a defined detection area.
The DAPPRA DPB Series is a front ultra-thin area sensor line. The DPB-0420-NPN-NC uses 4 beams at 20 mm pitch, providing a 60 mm protection height for compact machines and space-constrained automation equipment.
Are Safety Light Curtain and Area Sensor the same?
+
Not exactly. In industrial automation, Safety Light Curtain and Area Sensor are often used loosely for similar multi-beam photoelectric products, but they may refer to different technical and safety requirements.
A Safety Light Curtain is typically associated with machine protection and functional safety standards. An Area Sensor is generally used for object detection, personnel detection, access monitoring and machine processes. The DPB-0420-NPN-NC is positioned as a front ultra-thin Industrial Area Sensor and Safety Light Curtain that combines both roles depending on the application.
What is the difference between a light curtain and a photoelectric sensor?
+
A photoelectric sensor usually provides single-point or single-beam detection, such as a photoelectric switch or diffuse reflective sensor. A light curtain or area sensor uses multiple parallel beams to create a detection field for wider coverage.
The DPB-0420-NPN-NC uses 4 parallel infrared beams, so it can detect multiple positions, small parts or access conditions across a defined area rather than a single point.
How many beams should I choose for an area sensor?
+
The number of beams depends on the required detection height and the size of the objects or personnel to be detected. More beams provide higher resolution over the same height.
The DPB-0420-NPN-NC uses 4 beams with a 20 mm pitch, providing a 60 mm protection height. For larger openings or finer detection needs, other DPB Series models with more beams and different pitches can be selected.
What beam spacing or resolution should I choose?
+
Beam spacing determines the smallest object that can be reliably detected. Smaller spacing (such as 10 mm or 20 mm) provides higher resolution for small parts, hand detection or precise positioning. Larger spacing (such as 30 mm or 40 mm) is suitable for body detection or large-object presence checks.
The DPB-0420-NPN-NC uses a 20 mm optical-axis pitch, which balances resolution and cost for compact machine protection and object detection applications.
Can an area sensor be used on a conveyor belt?
+
Yes. Area sensors are commonly used on conveyor belts for object detection, position confirmation, missing-part detection and counting. The multiple beams allow the sensor to detect different product heights and positions across the conveyor width.
The DPB-0420-NPN-NC's 4-beam detection field and 0.1–3 m detection distance make it suitable for conveyor monitoring where compact mounting space is limited.
Can an area sensor be used for object counting?
+
Yes. When connected to a PLC or counter, the DPB-0420-NPN-NC can be used to count objects passing through the detection field. The NPN NC output provides a signal to the controller each time a beam is interrupted.
For reliable counting, the object must fully interrupt at least one beam, and the PLC scan time and sensor response time (≤5 ms) should be considered for high-speed lines.
Can an area sensor detect objects with different heights?
+
Yes. Because an area sensor uses multiple beams at different heights, it can detect objects that are tall, short or at different positions within the detection field.
The DPB-0420-NPN-NC uses 4 beams spaced at 20 mm, covering a 60 mm protection height, so objects within that range can be detected depending on their size and position relative to the beams.
Can an area sensor be connected to a PLC?
+
Yes. The DPB-0420-NPN-NC provides an NPN output that can be connected to a compatible PLC or machine controller. The output logic is Normally Closed (NC).
Before wiring, confirm the PLC input type (NPN / PNP), input voltage and whether the control circuit expects a sinking or sourcing signal. If the PLC uses PNP inputs, choose a PNP output version of the DPB Series instead.
How do I connect an NPN area sensor to a PLC?
+
Connect the sensor output to a PLC input that supports NPN (sinking) signals. The sensor output switches the negative side, so the PLC common terminal usually connects to the positive supply.
The DPB-0420-NPN-NC operates on DC24V ±20%. Verify the PLC input voltage, input type and terminal layout before wiring, and follow the DPB Series NPN wiring diagram.
Why is my area sensor giving false detection?
+
False detection is usually caused by optical interference, misalignment, reflective surfaces, strong ambient light, contamination on the lens, or unstable power supply.
Check that the emitter and receiver are properly aligned, that the lenses are clean, that no reflective object is near the beam path, and that the DC24V supply is stable. Reducing background reflection and optical interference usually solves most false detection issues.
Why is my area sensor detection unstable?
+
Unstable detection can result from vibration, loose mounting brackets, partial beam blockage, weak power supply, or nearby high-power equipment causing electrical noise.
Ensure the DPB-0420-NPN-NC is securely mounted with the top and bottom brackets, that the emitter and receiver remain parallel, and that the DC24V supply and signal wiring are stable and separated from high-voltage cables.
Which sensor should I use for people detection on a conveyor?
+
For people detection on a conveyor, a multi-beam area sensor or safety light curtain is usually preferred over a single photoelectric sensor because it covers a wider detection height and reduces the risk of missed detection.
The DPB-0420-NPN-NC provides a 60 mm protection height with 4 beams at 20 mm pitch, suitable for compact conveyor applications. For larger personnel detection areas, select a DPB Series model with a higher beam count and greater protection height.
Which sensor should I use for machine access protection?
+
Machine access protection typically requires a Safety Light Curtain or Area Sensor with appropriate resolution and response time for the risk assessment. The required protection height, detection capability and safety distance depend on the machine opening and stopping performance.
The DPB-0420-NPN-NC is suitable for compact access points and small machine openings where a 60 mm protection height is sufficient. For larger openings or higher safety requirements, select another DPB or DPF Series model and confirm the configuration with a qualified safety engineer.
Discover More
Explore the DAPPRA Front Ultra-Thin Area Sensor Series
View all DPB Series products and find the right solution for your space-constrained application.
View All SeriesNeed Help?
Need DPB-0420-NPN-NC for Your Application?
Contact DAPPRA Automation for product specifications, technical documentation, application information and purchasing support.
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Related Technical Articles
✦ Front Ultra-Thin Industrial Area Sensor
Safety Light Curtain
NPN NC
IP65
DPB-0420-NPN-NC
Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain · 4-Beam · 20 mm Pitch · 60 mm Protection Height
The DAPPRA DPB-0420-NPN-NC is a four-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment.
It uses separate EMITTER and RECEIVER units to provide a 60 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
Its 14.5 × 28 mm front ultra-thin housing saves installation space for compact machines and confined automation equipment, supporting reliable multi-beam detection in space-limited installations.
Primary Product Classification: Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain.
Related Industry Terminology: Area Sensor / Light Curtain Sensor / Safety Light Curtain.
Product Overview
DAPPRA DPB-0420-NPN-NC is a four-beam Front Ultra-Thin Industrial Area Sensor and Safety Light Curtain designed for compact machines and space-constrained automation equipment. It uses separate EMITTER and RECEIVER units to provide a 60 mm protection height, with a 14.5 × 28 mm front ultra-thin housing cross section, NPN normally closed output and a ≤5 ms response time.
The DPB Series uses Multiple Parallel Beam Through-Beam Detection Technology and provides different beam quantities, optical-axis pitches and protection heights for compact automation equipment, machinery protection, personnel protection, access detection and object detection applications.
The DPB-0420-NPN-NC is suitable for personnel detection, machine access detection, machine protection and object detection.
DPB-0420-NPN-NC Key Features
- Front Ultra-Thin Design
- 14.5 × 28 mm Housing Cross Section
- 4 Optical Beams
- 20 mm Optical-Axis Pitch
- 60 mm Protection Height
- 100 mm Total Height
- ≤5 ms Response Time
- 0.1–3 m Detection Distance
- NPN Normally Closed Output
- DC24V ±20% Working Voltage
- IP65 Protection Rating
- Line Synchronization
- TYPE 4 Safety Level
- 2 m Signal Connection Cables
- Top & Bottom Bracket Mounting
Front Ultra-Thin Housing Design
The DPB Series uses a front ultra-thin housing design with a confirmed cross section of 14.5 × 28 mm. This housing profile allows the sensor to be installed on compact machines and confined automation equipment where standard-sized sensors would not fit.
The aluminum alloy housing supports reliable multi-beam detection while maintaining TYPE 4 safety level characteristics, complete self-checking diagnostics and strong electromagnetic interference resistance.
The DPB Series focuses on achieving a balance between ultra-thin installation, optical detection reliability and industrial durability.
Product Specifications
| Parameter | DPB-0420-NPN-NC |
|---|---|
| Product Series | DPB Series |
| Product Type | Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain |
| SKU | OL08 |
| Optical Beam Quantity | 4 Beams |
| Optical-Axis Pitch | 20 mm |
| Protection Height | 60 mm |
| Total Height | 100 mm |
| Housing Cross Section | 14.5 × 28 mm (Front Ultra-Thin) |
| Response Time | ≤5 ms |
| Detection Distance | 0.1–3 m |
| Working Voltage | DC24V ±20% |
| Output | NPN |
| Signal Logic | NC (Normally Closed) |
| Protection Rating | IP65 |
| Housing Material | Aluminum Alloy |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Cable Length | 2 m (Standard) / Custom Available |
| Mounting | Top & Bottom Brackets (M4 Screws) |
Optical Detection Structure
The DPB-0420-NPN-NC uses separate EMITTER and RECEIVER units to create a parallel infrared detection field.
The 4 optical beams are arranged with a 20 mm optical-axis pitch, providing a 60 mm protection height.
EMITTER → Parallel Infrared Beams → RECEIVER
When an object or person interrupts the infrared beam path, the receiver detects the change in the optical field and provides the corresponding NPN NC output.
Area Sensor vs Safety Light Curtain
The terms Area Sensor and Safety Light Curtain are commonly used in industrial automation to describe multi-beam photoelectric detection products, but they may represent different technical and safety requirements depending on the application.
An Industrial Area Sensor is generally used for multi-beam detection of personnel, objects, access areas and machine processes.
A Safety Light Curtain is typically associated with machine protection and applications where specific functional-safety requirements and applicable safety standards need to be considered.
The DPB-0420-NPN-NC combines multi-beam infrared detection with a front ultra-thin design, making it suitable for personnel detection, object detection, access detection and machine protection applications in space-limited installations.
Front Ultra-Thin Industrial Area Sensor / Safety Light Curtain
Fast ≤5 ms Response
With a response time of ≤5 ms, the DPB-0420-NPN-NC provides fast detection for applications requiring rapid response to objects or personnel entering or passing through the sensing area.
Combined with line synchronization between the emitter and receiver, the system improves resistance to optical interference while supporting stable multi-beam detection.
IP65 Protection for Industrial Environments
The DPB-0420-NPN-NC features an IP65 protection rating with an aluminum alloy housing, making it suitable for industrial automation environments where protection against dust and water jets is required.
The DPB Series operates on a DC24V ±20% power supply with protection against power overvoltage, reverse polarity and output overcurrent.
NPN Normally Closed Output
The DPB-0420-NPN-NC uses an NPN Normally Closed (NC) output configuration for connection with compatible industrial control systems. NPN NO, PNP NC and PNP NO output options are also available within the DPB Series.
DPB-0420-NPN-NC Model Information
The model number identifies the DPB Series configuration, beam quantity, optical-axis pitch, output type and signal logic.
Model Code
DPB
-
04
20
-
NPN
-
NC
DPB
Series prefix — DAPPRA DPB Series Front Ultra-Thin Industrial Area Sensor & Safety Light Curtain.
04 — Beam Quantity
Number of optical beams. This model uses 4 optical beams.
20 — Optical-Axis Pitch
Optical-axis pitch in mm. This model uses 20 mm beam spacing.
NPN — Output Type
Output transistor type. This model uses NPN transistor output.
NC — Output Logic
NC = Normally Closed; NO = Normally Open. This model uses Normally Closed logic.
Field
Meaning
Value
DPB
Series prefix
DPB
Beam Quantity
Number of optical beams
04
Optical-Axis Pitch
Distance between adjacent optical axes
20 mm
Output Type
Transistor output configuration
NPN
Output Logic
Signal logic state
NC (Normally Closed)
Example: DPB-0420-NPN-NC = DPB Series, 4 beams, 20 mm optical-axis pitch,
NPN output, Normally Closed logic.
Dimensions
The DPB-0420-NPN-NC features a 14.5 × 28 mm front ultra-thin housing with a 60 mm protection height and 100 mm total height.
Key dimensions:
- Housing Cross Section: 14.5 × 28 mm
- Optical-Axis Pitch: 20 mm
- Protection Height: 60 mm
- Total Height: 100 mm
Installation Method
The DPB Series uses a top and bottom bracket mounting configuration. The emitter and receiver are fixed to the machine frame through the mounting brackets at both ends of the housing.
The 14.5 × 28 mm front ultra-thin housing provides a compact installation profile while maintaining the internal structure required for reliable multi-beam detection.
The EMITTER and RECEIVER should be securely installed and accurately aligned to ensure reliable infrared detection.
- Mounting Position — Top and bottom ends of the emitter and receiver housing
- Bracket Set — Standard top and bottom mounting brackets with M4 screws, nuts, washers and spring washers
- Alignment — The emitter and receiver must be mounted parallel with the optical axes facing each other
DPB Series Model Selection
The DPB Series provides different beam quantities, optical-axis pitches and protection heights for different industrial detection and machine protection requirements.
For the DPB-0420-NPN-NC:
DPB-0420-NPN-NC → 4 Beams · 20 mm Optical-Axis Pitch · 60 mm Protection Height · 100 mm Total Height
For the complete DPB Series model selection table, including different beam quantities, optical-axis pitches and protection heights, please visit the DPB Series page. [VIEW DPB SERIES MODEL SELECTION →]
Wiring & Controller Compatibility
The DPB-0420-NPN-NC provides an NPN normally closed output with a DC24V ±20% working voltage. The output is compatible with NPN-input PLCs, controllers or interface circuits.
Before connection, verify the input type and wiring configuration of the control system.
The DPB Series uses separate EMITTER and RECEIVER units with line synchronization for coordinated optical-beam operation.
| Electrical Configuration | Specification |
|---|---|
| Working Voltage | DC24V ±20% |
| Output Type | NPN |
| Signal Logic | NC (Normally Closed) |
| Synchronization | Line Synchronization |
| Safety Level | TYPE 4 |
| Control Interface | Compatible with NPN-input PLCs, controllers or interface circuits |
Controller Options
The DPB Series can be integrated with dedicated controllers for different machine installation and control requirements.
Two controller configurations are available:
Built-in Controller
DAPPRA DSC-E220
DAPPRA DSC-E220 is a built-in controller designed for installation inside the machine cabinet. It provides power and control functions for compatible Safety Light Curtain and Industrial Area Sensor systems.
View DSC-E220 Built-in Controller →External Controller
DAPPRA DSC-G220
DAPPRA DSC-G220 is an external controller designed for use with compatible Safety Light Curtain and Industrial Area Sensor systems. It provides an external control interface for machine integration and control applications.
View DSC-G220 External Controller →One controller can manage multiple DPB sensor sets, forming multi-face protection such as one-to-two or one-to-three configurations for larger press machines.
Applications
Machine and Personnel Applications
- Machine Protection
- Personnel Protection
- Machine Area Detection
- Object Detection
- Material Detection
Automation and Equipment Applications
- Conveyor Monitoring
- Automated Equipment
- Packaging Machinery
- Cutting Equipment
- Hydraulic Machinery
- Robotic Equipment
- General Industrial Automation
FAQ
Common questions about Area Sensor technology, DPB Series selection, installation and troubleshooting.
What is an Area Sensor?
+
An Area Sensor is a multi-beam photoelectric detection device that uses parallel infrared beams between an emitter and a receiver to detect objects, personnel or access conditions across a defined detection area.
The DAPPRA DPB Series is a front ultra-thin area sensor line. The DPB-0420-NPN-NC uses 4 beams at 20 mm pitch, providing a 60 mm protection height for compact machines and space-constrained automation equipment.
Are Safety Light Curtain and Area Sensor the same?
+
Not exactly. In industrial automation, Safety Light Curtain and Area Sensor are often used loosely for similar multi-beam photoelectric products, but they may refer to different technical and safety requirements.
A Safety Light Curtain is typically associated with machine protection and functional safety standards. An Area Sensor is generally used for object detection, personnel detection, access monitoring and machine processes. The DPB-0420-NPN-NC is positioned as a front ultra-thin Industrial Area Sensor and Safety Light Curtain that combines both roles depending on the application.
What is the difference between a light curtain and a photoelectric sensor?
+
A photoelectric sensor usually provides single-point or single-beam detection, such as a photoelectric switch or diffuse reflective sensor. A light curtain or area sensor uses multiple parallel beams to create a detection field for wider coverage.
The DPB-0420-NPN-NC uses 4 parallel infrared beams, so it can detect multiple positions, small parts or access conditions across a defined area rather than a single point.
How many beams should I choose for an area sensor?
+
The number of beams depends on the required detection height and the size of the objects or personnel to be detected. More beams provide higher resolution over the same height.
The DPB-0420-NPN-NC uses 4 beams with a 20 mm pitch, providing a 60 mm protection height. For larger openings or finer detection needs, other DPB Series models with more beams and different pitches can be selected.
What beam spacing or resolution should I choose?
+
Beam spacing determines the smallest object that can be reliably detected. Smaller spacing (such as 10 mm or 20 mm) provides higher resolution for small parts, hand detection or precise positioning. Larger spacing (such as 30 mm or 40 mm) is suitable for body detection or large-object presence checks.
The DPB-0420-NPN-NC uses a 20 mm optical-axis pitch, which balances resolution and cost for compact machine protection and object detection applications.
Can an area sensor be used on a conveyor belt?
+
Yes. Area sensors are commonly used on conveyor belts for object detection, position confirmation, missing-part detection and counting. The multiple beams allow the sensor to detect different product heights and positions across the conveyor width.
The DPB-0420-NPN-NC's 4-beam detection field and 0.1–3 m detection distance make it suitable for conveyor monitoring where compact mounting space is limited.
Can an area sensor be used for object counting?
+
Yes. When connected to a PLC or counter, the DPB-0420-NPN-NC can be used to count objects passing through the detection field. The NPN NC output provides a signal to the controller each time a beam is interrupted.
For reliable counting, the object must fully interrupt at least one beam, and the PLC scan time and sensor response time (≤5 ms) should be considered for high-speed lines.
Can an area sensor detect objects with different heights?
+
Yes. Because an area sensor uses multiple beams at different heights, it can detect objects that are tall, short or at different positions within the detection field.
The DPB-0420-NPN-NC uses 4 beams spaced at 20 mm, covering a 60 mm protection height, so objects within that range can be detected depending on their size and position relative to the beams.
Can an area sensor be connected to a PLC?
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Yes. The DPB-0420-NPN-NC provides an NPN output that can be connected to a compatible PLC or machine controller. The output logic is Normally Closed (NC).
Before wiring, confirm the PLC input type (NPN / PNP), input voltage and whether the control circuit expects a sinking or sourcing signal. If the PLC uses PNP inputs, choose a PNP output version of the DPB Series instead.
How do I connect an NPN area sensor to a PLC?
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Connect the sensor output to a PLC input that supports NPN (sinking) signals. The sensor output switches the negative side, so the PLC common terminal usually connects to the positive supply.
The DPB-0420-NPN-NC operates on DC24V ±20%. Verify the PLC input voltage, input type and terminal layout before wiring, and follow the DPB Series NPN wiring diagram.
Why is my area sensor giving false detection?
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False detection is usually caused by optical interference, misalignment, reflective surfaces, strong ambient light, contamination on the lens, or unstable power supply.
Check that the emitter and receiver are properly aligned, that the lenses are clean, that no reflective object is near the beam path, and that the DC24V supply is stable. Reducing background reflection and optical interference usually solves most false detection issues.
Why is my area sensor detection unstable?
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Unstable detection can result from vibration, loose mounting brackets, partial beam blockage, weak power supply, or nearby high-power equipment causing electrical noise.
Ensure the DPB-0420-NPN-NC is securely mounted with the top and bottom brackets, that the emitter and receiver remain parallel, and that the DC24V supply and signal wiring are stable and separated from high-voltage cables.
Which sensor should I use for people detection on a conveyor?
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For people detection on a conveyor, a multi-beam area sensor or safety light curtain is usually preferred over a single photoelectric sensor because it covers a wider detection height and reduces the risk of missed detection.
The DPB-0420-NPN-NC provides a 60 mm protection height with 4 beams at 20 mm pitch, suitable for compact conveyor applications. For larger personnel detection areas, select a DPB Series model with a higher beam count and greater protection height.
Which sensor should I use for machine access protection?
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Machine access protection typically requires a Safety Light Curtain or Area Sensor with appropriate resolution and response time for the risk assessment. The required protection height, detection capability and safety distance depend on the machine opening and stopping performance.
The DPB-0420-NPN-NC is suitable for compact access points and small machine openings where a 60 mm protection height is sufficient. For larger openings or higher safety requirements, select another DPB or DPF Series model and confirm the configuration with a qualified safety engineer.
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