CAD Drawing

DPR-0820-NPN-NC

Industrial Area Sensor · Mechanical Drawing & Installation Layout

This CAD drawing reference provides mechanical dimensions, installation layout and mounting reference information for the DAPPRA DPR-0820-NPN-NC Industrial Area Sensor. It is intended for engineers, designers and system integrators involved in machine design and industrial automation projects.

Dimension Overview

The DPR-0820-NPN-NC Industrial Area Sensor has a compact aluminum alloy housing designed for integration into industrial machinery and automation equipment. The following drawing shows the overall mechanical dimensions, including protection height, total height, optical axis pitch and housing cross section. For complete product specifications, see the DPR-0820-NPN-NC product page.

DPR-0820-NPN-NC Mechanical Dimension Drawing

DPR-0820-NPN-NC mechanical dimensions and installation reference

Key Dimension Summary

Dimension Parameter	Value
Protection Height	140 mm
Total Height	206 mm
Optical Axis Pitch	20 mm
Housing Cross Section	29 × 30 mm
Beam Quantity	8 optical beams

Drawing Title Block

Product ModelDPR-0820-NPN-NC

SKUSD72

Product TypeIndustrial Area Sensor

Product SeriesDPR Series

Drawing TypeMechanical Dimension Drawing

Drawing NumberCAD-DPR-0820-001

UnitMillimeter (mm)

Revision1.0

ManufacturerDAPPRA Automation

ScaleNot to Scale

Mechanical Specifications

Parameter	Specification
Beam Quantity	8 Optical Beams
Optical Axis Pitch	20 mm
Protection Height	140 mm
Total Height	206 mm
Housing Cross Section	29 × 30 mm
Housing Material	Aluminum Alloy
Protection Rating	IP65
Connector	M12 Cable

Mounting & Installation Layout

The DPR-0820-NPN-NC supports three installation configurations to accommodate different machine structures and protection requirements. The following drawing shows the installation layout reference for vertical, side and adjustable bracket mounting.

DPR-0820-NPN-NC installation layout reference

Installation Configuration Reference

Configuration	Description	Typical Use
Standard Vertical	Emitter and receiver placed vertically opposite each other	Machine protection, access detection
Side Installation	Side-mounted configuration for limited mounting space	Compact equipment, customized layout
Adjustable Bracket	Multi-directional adjustable bracket mounting	Custom automation, precise alignment

Mounting Accessories

Top and Bottom Mounting Brackets — Standard mounting configuration
Side Mounting Brackets — For side installation applications
Cantilever Mounting Brackets — For adjustable multi-directional mounting
Mounting Screws and Hardware — Included with standard package

Installation Note

Ensure that the emitter and receiver are aligned correctly and that the mounting structure is stable enough to prevent vibration-induced misalignment.

Drawing Notes

Units — All dimensions are in millimeters (mm) unless otherwise specified.
Scale — The drawing shown in this document is not to scale. Refer to the original CAD file for accurate dimensional reference.
Tolerances — Standard manufacturing tolerances apply. Contact DAPPRA Automation for specific tolerance requirements.
Protection Height — Defined as (Beam Quantity − 1) × Optical Axis Pitch. For DPR-0820-NPN-NC: (8 − 1) × 20 mm = 140 mm.
Total Height — Includes the housing and mounting structure beyond the protection height.
Mounting — Verify that the mounting surface is flat and stable before installation.
Alignment — Emitter and receiver optical beams must be properly aligned for reliable detection performance.

CAD File Request

For detailed CAD files suitable for machine design and system integration, please contact DAPPRA Automation. Available file formats may include DWG, DXF and STEP. You can also visit the DPR-0820-NPN-NC product page for the latest technical documentation.

File Format	Description
DWG	2D mechanical drawing for AutoCAD and compatible software
DXF	Universal 2D drawing exchange format
STEP	3D model for mechanical design and simulation

Frequently Asked Questions

What is optical axis pitch? +

Optical axis pitch is the distance between two adjacent infrared beams in a safety light curtain or area sensor. It determines the minimum object size that can be reliably detected. A smaller pitch provides higher detection resolution. The DPR-0820-NPN-NC uses a 20 mm optical axis pitch.

How do I choose the correct protection height? +

Protection height should match the machine opening or the area that needs to be protected. First measure the actual machine opening, then select a protection height that provides adequate coverage. The DPR-0820-NPN-NC provides a 140 mm protection height, suitable for small machine openings and compact equipment.

What is the difference between 10 mm, 20 mm, 30 mm and 40 mm resolution or beam spacing? +

Beam spacing (also called resolution or optical axis pitch) determines the minimum detectable object size:

• 10 mm — detects small objects such as fingers or small parts
• 20 mm — suitable for hand detection and general safety applications
• 30 mm — medium detection for larger objects
• 40 mm — suitable for body detection and general presence detection

The DPR-0820-NPN-NC uses a 20 mm pitch.

What is the difference between detection distance and safety distance? +

Detection distance refers to the maximum distance between the emitter and receiver within which the sensor can reliably detect beam interruption (for the DPR-0820-NPN-NC, this is 0.2–3 m). Safety distance is a separate concept — it is the minimum installation distance from the hazardous area, calculated based on machine stopping time, sensor response time, approach speed and applicable safety standards.

What should I consider when installing a safety light curtain? +

When installing a safety light curtain, consider: proper alignment between the emitter and receiver, stable mounting to prevent vibration-induced misalignment, adequate safety distance from the machine hazard, environmental conditions (dust, oil, humidity, ambient light), and correct wiring to the control system.

Can an area sensor detect objects with different heights? +

Yes. Because area sensors use multiple parallel infrared beams, objects entering the detection area at different heights can be detected as long as they interrupt one or more beams. The DPR-0820-NPN-NC has 8 beams across a 140 mm protection height, allowing detection of objects positioned at various points within the detection field.