DAPPRA DPR-1240-NPN-NC 12 Beam Safety Light Curtain Area Sensor

The DAPPRA DPR-1240-NPN-NC is a DPR Series Safety Light Curtain / Area Sensor designed for multi-beam infrared detection, machine protection and industrial automation applications.

It provides 12 infrared beams, 40 mm optical axis pitch, 440 mm protection height, 526 mm total height and NPN NC output configuration.

The SKU of the DPR-1240-NPN-NC is SH29.

DPR identifies the product series, 12 identifies the optical beam quantity, 40 identifies the 40 mm optical axis pitch, NPN identifies the output type, and NC identifies the signal logic.

DPR-1240-NPN-NC has 12 infrared optical beams.

The optical axis pitch, or beam spacing, is 40 mm.

The protection height is 440 mm.

Calculation:

The total height is 526 mm.

DPR-1240-NPN-NC uses through-beam infrared detection with an emitter and receiver.

The specified response time is <5 ms.

The specified detection distance is 0.2–3 m.

DPR-1240-NPN-NC has an IP65 protection rating.

The specified operating temperature is -10°C to +55°C.

DPR-1240-NPN-NC uses NPN output.

NC means Normally Closed signal logic.

Under the specified configuration, normal beam transmission produces a 0V low-level output, while beam interruption results in high impedance / no output.

The specified power supply is DC24V ±20%.

The NPN output can be connected to compatible PLC input circuits. Verify the PLC input specifications and wiring requirements before installation.

DPR-1240-NPN-NC should be wired according to the official product wiring diagram.

The specified system uses DC24V power and NPN NC output.

The cross-section is 29 × 30 mm.

The DPR Series is designed for industrial environments where humidity and contamination may occur, with an IP65 protection rating.

DPR-1240-NPN-NC has an IP65 rating and is designed for industrial environments where dust exposure may occur.

Yes. The DPR-1240-NPN-NC can be considered for CNC machine detection and machine protection applications where its 440 mm protection height and other specifications are suitable.

The DPR Series can be used in industrial press and hydraulic machine detection and protection applications.

Yes. The multi-beam configuration can be used for object detection and area monitoring in automated packaging equipment.

Yes. The DPR Series can be integrated into conveyor automation systems for object detection and machine control applications.

The DPR Series can be used for robot peripheral detection and automated workcell applications where the specified detection characteristics are appropriate.

The product documentation identifies SIL safety certification for the DPR Series product family.

For a specific machine safety project, verify the applicable certificate and safety documentation for the exact model.

The product documentation includes:

• SIL Safety Certification
• CE Certification
• FCC Certification
• RoHS Compliance

Select the model according to protection height, optical axis pitch, beam quantity, sensing distance, output type and signal logic.

DPR-1240-NPN-NC provides 12 beams, 40 mm pitch, 440 mm protection height and NPN NC output .

For the DPR configuration shown here:

Using the specified DPR Series calculation, 12 beams with 40 mm optical axis pitch provide 440 mm protection height.

The DPR-1240-NPN-NC is the more compact configuration when approximately 440 mm protection height is required.

Not necessarily.

In Indonesia, the terms Safety Light Curtain and Area Sensor are sometimes used to search for similar multi-beam infrared sensing products.

However, the actual safety function, certification, intended application and technical specifications must be verified for the specific product.

A Safety Light Curtain is generally associated with machine safety and personnel protection, while Area Sensor is commonly used as a broader term for multi-beam area detection.

For DPR-1240-NPN-NC, the product is presented as a Safety Light Curtain / Area Sensor because it provides multi-beam infrared detection and is positioned for machine protection and industrial automation applications.

The specified optical axis pitch is 40 mm.

Engineers should distinguish optical axis pitch from any separately specified safety resolution value.

A specific minimum safety distance cannot be determined from the product specifications alone.

The required installation distance depends on machine stopping time, sensor response time, applicable safety requirements and the complete machine safety system.

The DPR Series can be integrated into conveyor and object detection applications.

A complete muting function requires appropriate external muting sensors and control logic according to the machine safety design.

The specified ambient light resistance is 10000 Lux.

The emitter and receiver should be installed directly opposite each other with the corresponding optical beams correctly aligned.

Refer to the official DPR-1240-NPN-NC installation guide for the detailed alignment procedure.

DPR-1240-NPN-NC has:

• Protection height: 440 mm
• Total height: 526 mm
• Difference: 86 mm

DPR-1240-NPN-NC provides a 440 mm protection height.

Whether it is suitable for a specific machine opening depends on the actual machine design, required detection coverage, installation position and applicable safety requirements.

The DPR-1240-NPN-NC has an IP65 rating, which means it is dust-tight and protected against water jets. However, outdoor use also depends on factors like direct sunlight (ambient light resistance is 10000 Lux), temperature range (-10°C to +55°C), and UV exposure. For direct outdoor installation, additional shielding may be needed.

The DPR-1240-NPN-NC uses a standard M12 connector. A 4-wire shielded cable is typically recommended for industrial environments to reduce electromagnetic interference. The standard wiring is: Brown (DC24V+), Blue (GND), Black (NPN output).

The NPN output is rated for a maximum load current of 200 mA. When connecting to PLCs, relays, or other loads, ensure the total current consumption does not exceed this value.

Yes. The DPR Series sensors typically include LED indicators on both the emitter and receiver. These show power status, beam alignment condition, and output state. Refer to the installation guide for the specific LED color codes and their meanings.

The optical axis pitch is 40 mm. This means that an object with a diameter smaller than 40 mm could potentially pass between two beams without being detected, depending on its position. For applications requiring detection of smaller objects, consider models with a narrower pitch (e.g., 10 mm or 20 mm versions in the DPR Series).

The DPR-1240-NPN-NC has an NPN output. It is directly compatible with PLC input modules that accept NPN (sinking) inputs. If your PLC uses PNP (sourcing) inputs, you will need to use an external interface relay or a signal converter, or choose a PNP-output version of the DPR Series.

Yes, multiple DPR sensors can be used on the same machine. However, care must be taken to avoid optical interference between adjacent sensors. If sensors are placed near each other, consider using modulated beams or physical barriers to prevent cross-talk. Consult the technical documentation for specific synchronization and mounting recommendations.

Yes. The DPR Series offers both NPN and PNP output versions. For a PNP version with the same 12-beam, 440 mm protection height configuration, the model would be DPR-1240-PNP-NC. Check the product selection table for available configurations.

Use a soft, lint-free cloth slightly moistened with isopropyl alcohol or a mild glass cleaner. Avoid abrasive materials or harsh solvents that could scratch or damage the acrylic optical window. Regular cleaning is recommended in dusty or oily environments.

The IP65 rating provides protection against water jets, which is suitable for many washdown applications. However, for food processing areas, additional considerations such as food-grade materials, chemical resistance, and regulatory compliance (e.g., FDA or EHEDG guidelines) may apply. Please consult with the manufacturer for specific suitability.

The infrared LEDs used in the DPR Series have a typical lifespan of 50,000 to 100,000 hours under normal operating conditions. This is equivalent to approximately 6 to 11 years of continuous 24/7 operation. Performance may degrade over time, and periodic checks of the detection range are recommended as part of regular maintenance.