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Industrial Area Sensor & Safety Light Curtain — DRS Series
DAPPRA Diffuse Reflection Safety Sensor
DRS Series — Diffuse
Reflection Safety Sensor
The DAPPRA DRS Series is a Diffuse Reflection Safety Sensor designed for applications that require a different sensing configuration from conventional through-beam systems. It emits a light beam and detects the light reflected back from an object, so only one side of the detection zone needs to be wired.
The DRS Series uses a 40 mm optical-axis pitch and operates on DC 24 V ±20 %, with a response time of less than 5 ms and a protection distance of 0.1–1.2 m. NPN and PNP output options are available, and the aluminium alloy housing provides IP65 protection.
40 mm
Optical-Axis Pitch
<5 ms
Response Time
0.1–1.2 m
Protection Distance
IP65
Protection Rating
Overview
DRS Series Overview
The DAPPRA DRS Series is a Diffuse Reflection Safety Sensor series that uses diffuse-reflection detection instead of conventional through-beam systems. Instead of installing a separate emitter and receiver pair, the DRS Series emits a light beam and detects the light reflected back from an object, so only one side of the detection zone needs to be wired.
The series provides a 40 mm optical-axis pitch and operates on DC 24 V ±20 %. With a response time of less than 5 ms and a protection distance of 0.1–1.2 m, the DRS Series is suitable for applications where a through-beam configuration is difficult to install or where a more compact sensing arrangement is preferred.
NPN and PNP output options are available to match different machine control circuits. The aluminium alloy housing with IP65 protection provides reliable operation in industrial environments.
Key Features
DRS Series Key Features
Engineered for applications that require a different sensing configuration from conventional through-beam systems.
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Diffuse-Reflection Detection The DRS Series emits a light beam and detects the light reflected back from an object, so only one side of the detection zone needs to be wired — unlike through-beam systems that require a separate emitter and receiver pair.
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40 mm Optical-Axis Pitch A 40 mm optical-axis pitch provides a balanced resolution and protection configuration for a range of industrial applications.
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Fast Response Time Response time is less than 5 ms, supporting timely stopping and interlock actions on automated machinery.
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0.1–1.2 m Protection Distance The DRS Series provides a protection distance of 0.1–1.2 m, suited to short- to medium-range detection and protection tasks.
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NPN / PNP Output Options NPN and PNP output options are available to match different machine control circuits.
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DC 24 V ±20 % Operating Voltage Standard industrial DC 24 V supply with ±20 % tolerance, matching a wide range of industrial power environments.
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IP65 Aluminium Alloy Housing An aluminium alloy enclosure with IP65 protection is suited to demanding industrial environments.
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Integrated Protection Circuitry Power supply over-voltage protection, reverse-polarity protection and output over-current protection are built in as standard.
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Multiple Mounting Options Standard side mounting brackets, cantilever brackets and integrated tube brackets are available for different machine structures.
Model Selection
DRS Series Model Selection
Select the appropriate DRS model according to the beam quantity and output type.
The DRS Series provides a 40 mm optical-axis pitch configuration, with multiple beam quantities, protection heights and total heights for different industrial detection and protection requirements.
Protection height (H) is calculated as (beam quantity − 1) × 40 mm. Total height (L) additionally includes the upper and lower end caps and the PCB blind zones at each end of the sensor.
Model Code
DRS
–
04
40
–
NPN
–
NC
DRS
Series prefix — DAPPRA DRS Series Diffuse Reflection Safety Sensor.
04 — Beam Quantity
Number of optical beams, from 04 to 50 depending on the model.
40 — Optical-Axis Pitch
Optical-axis pitch in mm: 40.
NPN — Output Type
Output type: NPN / PNP.
NC — Output Logic
NC = Normally Closed; NO = Normally Open.
Field
Meaning
Available Values
DRS
Series prefix
DRS
Beam Quantity
Number of optical beams
04 – 50
Optical-Axis Pitch
Distance between adjacent optical axes
40 mm
Output Type
Output configuration
NPN / PNP
Output Logic
Signal logic state
NC / NO
Example: DRS-0440-NPN-NC = DRS Series, 4 beams, 40 mm optical-axis pitch, NPN output, Normally Closed logic.
Optical Axis Pitch D = 40 mm | Resolution 40 mm
| Beam Quantity | Protection Height (H) mm | Total Height (L) mm | Model |
|---|---|---|---|
| 4 | 120 | 205 | DRS-0440-NPN-NC |
| 6 | 200 | 285 | DRS-0640-NPN-NC |
| 8 | 280 | 365 | DRS-0840-NPN-NC |
| 10 | 360 | 445 | DRS-1040-NPN-NC |
| 12 | 440 | 525 | DRS-1240-NPN-NC |
| 14 | 520 | 605 | DRS-1440-NPN-NC |
| 16 | 600 | 685 | DRS-1640-NPN-NC |
| 18 | 680 | 765 | DRS-1840-NPN-NC |
| 20 | 760 | 845 | DRS-2040-NPN-NC |
| 22 | 840 | 925 | DRS-2240-NPN-NC |
| 24 | 920 | 1005 | DRS-2440-NPN-NC |
| · · · Intermediate beam quantities available from 26 to 48 · · · | |||
| 50 | 1960 | 2045 | DRS-5040-NPN-NC |
40 mm optical-axis pitch models are available with beam quantities from 4 to 50. Protection height H = (Beam Quantity − 1) × 40 mm. Total height L = Top cap + Bottom cap + Blind zones + Protection height. NPN / PNP output options are available for each model.
Protection heights outside the listed standard range can be customized. All dimensions are manually measured and are for reference only — please refer to the actual product for final dimensions.
Technical Parameters
DRS Series Technical Specifications
Confirmed electrical, optical and environmental parameters for the DAPPRA DRS Series.
| Detection Principle | Diffuse reflection (no separate emitter / receiver pair required) |
| Optical-Axis Pitch | 40 mm |
| Resolution | 40 mm |
| Beam Quantity | 4 – 50 |
| Protection Distance | 0.1 – 1.2 m |
| Response Time | < 5 ms |
| Operating Voltage | DC 24 V ± 20 % |
| Output Type | NPN / PNP output |
| Output Logic | NC / NO |
| Protection Circuitry | Power over-voltage protection, reverse-polarity protection, output over-current protection |
| Housing Material | Aluminium alloy |
| Protection Rating | IP65 |
| Operating Temperature | −10 ~ 55 °C |
| Operating Humidity | < 85 % RH at 20 °C |
Dimensions
DRS Series Dimensions
The DRS Series uses an aluminium alloy housing designed for diffuse-reflection sensing in industrial environments.
Protection height is determined by the beam quantity of each model. Total height additionally includes the upper and lower end caps and the PCB blind zones at each end of the sensor.
For complete mechanical dimensions, refer to the corresponding DRS model page and CAD drawing.
| Optical-Axis Pitch (D) | 40 mm |
| Protection Height (H) | (Beam Quantity − 1) × 40 mm |
| Total Height (L) | Caps + Blind Zones + Protection Height |
| Housing Material | Aluminium alloy |
| Protection Rating | IP65 |
| Mounting | Side / Cantilever / Integrated tube |
Measurement unit: mm. Data is manually measured and may contain minor deviations — please refer to the actual product for final dimensions.
Installation & Mounting
DRS Series Installation & Mounting Options
Because the DRS Series uses diffuse-reflection detection, only one side of the detection zone needs to be wired — simplifying installation compared with through-beam systems.
Standard
Side Mounting Brackets
Standard side mounting brackets for conventional installation of the DRS sensor on the machine structure.
Optional
Cantilever Brackets
Cantilever mounting support for extended mounting positions and adjustable sensor positioning.
Optional
Integrated Tube Brackets
Integrated tube bracket system for floor-standing or free-standing guarding configurations.
The appropriate mounting configuration should be selected according to the machine structure and available installation space.
Wiring Principle
DRS Series Wiring Principle
The DRS Series supports NPN and PNP output configurations at DC 24 V ±20 %. Select the wiring method according to the output type of the selected model.
NPN Output Wiring (DC24V)
The NPN output switches the signal line to 0 V (GND) when an object is detected. Connect the DRS output to the PLC or controller input configured for NPN (sinking) input.
PNP Output Wiring (DC24V)
The PNP output switches the signal line to +24 V when an object is detected. Connect the DRS output to the PLC or controller input configured for PNP (sourcing) input.
The actual wiring should follow the wiring diagram provided for the selected DRS model. Verify the output type (NPN / PNP) and output logic (NC / NO) before connecting to the machine control circuit.
Accessories
DRS Series Accessories
The DRS Series includes the sensor unit as the main sensing component. Signal cables, mounting brackets and documentation are provided for installation and system connection.
Safety Sensor Unit
DRS diffuse-reflection safety sensor unit as the main sensing component.
Signal Connection Cable
Signal connection cable approximately 3 m as standard. Custom lengths are available on request.
Mounting Brackets
Standard side mounting brackets. Cantilever and integrated tube brackets are available as options.
User Manual
Wiring instructions, installation instructions and operation instructions are included.
The exact accessory configuration may vary according to the selected DRS model and mounting requirements.
Applications
DRS Series Industrial Applications
The DRS Series is suitable for applications that require a different sensing configuration from conventional through-beam systems, including automation equipment, small and medium-sized machinery, and short- to medium-range detection and protection tasks.
Object Detection
Presence Checking
Machine Area Detection
Material Detection
Small & Medium Machinery
Automation Equipment
Assembly Stations
Conveyor Monitoring
Packaging Machinery
Cutting Equipment
Robotic Equipment
Special Sensing Configurations
Next Step
Explore the DRS Series
Browse all DRS Series diffuse reflection safety sensor products, or return to the Industrial Area Sensor & Safety Light Curtain category page.
Support
DRS Series FAQ
What is the DAPPRA DRS Series?
The DAPPRA DRS Series is a Diffuse Reflection Safety Sensor series that uses diffuse-reflection detection instead of conventional through-beam systems. It is suitable for applications where a separate emitter and receiver pair is difficult to install.
Which optical-axis pitch is available in the DRS Series?
The DRS Series provides a 40 mm optical-axis pitch configuration.
How does diffuse-reflection detection work in the DRS Series?
Unlike through-beam systems, the DRS Series emits a light beam and detects the light reflected back from an object. This means only one side of the detection zone needs to be wired, simplifying installation.
What is the response time of the DRS Series?
The DRS Series response time is less than 5 ms.
What is the protection distance of the DRS Series?
The DRS Series supports a protection distance of 0.1–1.2 m.
What output options does the DRS Series support?
The DRS Series supports NPN and PNP output options.
What is the operating voltage of the DRS Series?
The DRS Series operates on DC 24 V ±20 %.
What is the protection rating of the DRS Series?
The DRS Series uses an aluminium alloy housing with an IP65 protection rating.