CAD Drawing

DPR-2440-NPN-NC Mechanical Dimensions & CAD Layout Reference

A complete mechanical reference for the DAPPRA DPR-2440-NPN-NC 24-beam Industrial Area Sensor and Safety Light Curtain — dimensions, mounting layout and selection guidance.

Published: 16.09.2020 Category: CAD Drawing Reading time: 7 min

General Information

The DAPPRA DPR-2440-NPN-NC is a 24-beam Industrial Area Sensor and Safety Light Curtain with a 40 mm optical axis pitch and a 920 mm protection height. This article provides the mechanical dimensions and installation layout reference.

For full product specifications, visit the DPR-2440-NPN-NC product page.

Key Mechanical Dimensions

Parameter	Value
Model	DPR-2440-NPN-NC
SKU	SD74
Beam Quantity	24 Beams
Optical Axis Pitch	40 mm
Protection Height	920 mm
Total Height	1006 mm
Housing Cross Section	29 × 30 mm
Housing Material	Industrial aluminum profile
Protection Rating	IP65
Operating Temperature	-10°C to +55°C

The 920 mm dimension represents the active protection/detection height, while 1006 mm represents the complete sensor height including the housing ends.

Mechanical dimensions of the DAPPRA DPR-2440-NPN-NC Industrial Area Sensor

Sensor Housing Cross Section

Dimension	Value
Housing Width	29 mm
Housing Depth	30 mm
Cross Section	29 × 30 mm
Mounting Type	Side bracket mounting
Connection	M12 industrial connector

Beam Layout Reference

The DPR-2440-NPN-NC has 24 optical beams evenly distributed at a 40 mm optical axis pitch across a 920 mm protection height.

Beam layout reference: the first beam is located near the top of the protection area, and the last beam is located near the bottom. The total beam span is (24 − 1) × 40 mm = 920 mm.

Beam layout and working principle of the DPR-2440-NPN-NC

DPR Series Model Selection

The DPR Series provides different beam quantities, optical axis pitches and protection heights. The table below helps engineers select the right model based on machine opening and protection requirements.

Model	Beams	Pitch	Protection Height	Total Height
DPR-0440-NPN-NC	4	40 mm	120 mm	206 mm
DPR-0640-NPN-NC	6	40 mm	200 mm	286 mm
DPR-0840-NPN-NC	8	40 mm	280 mm	366 mm
DPR-1040-NPN-NC	10	40 mm	360 mm	446 mm
DPR-1240-PNP-NC	12	40 mm	440 mm	526 mm
DPR-1440-NPN-NC	14	40 mm	520 mm	606 mm
DPR-1640-NPN-NC	16	40 mm	600 mm	686 mm
DPR-2440-NPN-NC	24	40 mm	920 mm	1006 mm

DAPPRA DPR Series Industrial Area Sensor Model Selection Table

Mounting Layout

The DPR-2440-NPN-NC can be installed using the available DAPPRA mounting configurations. The transmitter and receiver should be mounted opposite each other, with the optical beams aligned across the full protection height.

Mounting layout for the DPR-2440-NPN-NC Area Sensor

For full mechanical drawings and product details, refer to the DPR-2440-NPN-NC product page.

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Frequently Asked Questions

I need a 40 mm beam spacing area sensor. Which model should I choose? +

The DAPPRA DPR Series offers multiple 40 mm beam spacing models: DPR-0440 (4 beams), DPR-0640 (6 beams), DPR-0840 (8 beams), DPR-1040 (10 beams), DPR-1440 (14 beams), DPR-1640 (16 beams) and DPR-2440 (24 beams). Choose the model whose protection height matches your machine opening. The DPR-2440-NPN-NC provides the largest 40 mm pitch protection field at 920 mm.

My machine opening is 380 mm. Which safety light curtain should I choose? +

For a 380 mm machine opening, choose a model whose protection height is at least 380 mm. In the DPR Series 40 mm pitch range, the DPR-1040-NPN-NC provides a 360 mm protection height, and the DPR-1240 provides a 440 mm protection height. Select the closest protection height above your opening.

How do I select the right light curtain based on machine dimensions? +

First determine the machine opening height that must be monitored. Then select a protection height equal to or greater than that opening. Next confirm the required resolution (10 mm, 20 mm or 40 mm) based on the smallest object to be detected. Finally verify the detection distance, output configuration and mounting requirements.

How do I select between different light curtain models? +

Compare models based on beam quantity, optical axis pitch, protection height, total height, output type and signal logic. The DPR Series provides a consistent architecture with different protection heights. Use the model selection table in this article to identify the correct model for your application.

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

Detection distance is the maximum physical distance between the transmitter and receiver at which the sensor can reliably detect beams — for the DPR-2440-NPN-NC, this is 0.2–3 m. Safety distance is the minimum mounting distance between the light curtain and the machine hazard zone, calculated according to the machine stopping time, sensor response time and applicable safety standards.