DD Series Diffuse Reflection Safety Light Curtains
The DAIDISIKE DD series light curtain is a photoelectric sensor for industrial automation, using diffuse reflection for non-contact object detection. It features a yellow aluminum alloy housing, detection range over 2000mm, minimal blind zone, LED indicators, NPN/PNP dual outputs, and customizable beams (4-50, heights 160-2000mm). Supports gear adjustments (0-9, default 0 at ~0.5m) and self-learning mode. Ideal for stable-background settings like machinery protection and position monitoring, not suited for changing backgrounds. Gear settings save via 1s press or auto-save after 30s.
The DAIDISIKE DD series diffuse reflective light curtain is a high-performance photoelectric sensor device designed for industrial automation and safety protection. This product utilizes the diffuse reflection principle, emitting infrared beams and detecting light signals reflected from object surfaces to achieve non-contact object detection. The product features a yellow aluminum alloy housing, compact structure, and cable connection, suitable for various industrial environments such as machinery protection, object detection, and position monitoring. The DD series supports multiple gear adjustments, self-learning mode, dual-output signals, and ultra-long detection distances, with high detection accuracy and fast response speed. Key features include: detection distance up to over 2000mm with minimal blind zone; equipped with LED indicators (green power light, red signal light, and large digital display); supports NPN/PNP dual outputs, switchable between normally open/normally closed; fixed beam spacing, supports even-numbered beam customization. The product series models range from DD0440 to DD5040, covering 4 to 50 beams, with protection heights from 160mm to 2000mm and total heights from 209mm to 2049mm. This light curtain is suitable for environments with limited backgrounds but not recommended for scenarios where background brightness or position changes frequently. In self-learning mode, long-press the button for 2S to automatically adjust emission intensity, with the green light flashing during the process. Gear adjustment from 0 to 9, with higher values increasing emission intensity and detection distance. Factory default is gear 0 (about 0.5m detection distance), users can switch and save gears via long-press 1S or auto-save after 30S.
Specification Table
The following is the detailed specification table for the DD series diffuse reflective light curtain, organized based on the provided data, including number of beams, model, protection height (mm), and total height (mm). Protection height refers to the effective detection area height, and total height includes the housing dimensions. Beam spacing is fixed (typically 40mm, calculated from the formula L = number of beams * beam spacing + 49mm).
Number of Beams
Model
Protection Height (mm)
Total Height (mm)
4
DD0440
160
209
6
DD0640
240
289
8
DD0840
320
369
10
DD1040
400
449
12
DD1240
480
529
14
DD1440
560
609
16
DD1640
640
689
18
DD1840
720
769
20
DD2040
800
849
22
DD2240
880
929
24
DD2440
960
1009
26
DD2640
1040
1089
28
DD2840
1120
1169
30
DD3040
1200
1249
32
DD3240
1280
1329
34
DD3440
1360
1409
36
DD3640
1440
1489
38
DD3840
1520
1569
40
DD4040
1600
1649
42
DD4240
1680
1729
44
DD4440
1760
1809
46
DD4640
1840
1889
48
DD4840
1920
1969
50
DD5040
2000
2049
In the specification table, beam spacing can be calculated using the formula: H = (number of beams - 1) * beam spacing, total height L = number of beams * beam spacing + 49mm. A1 = 12mm, A2 = 12mm, B1 = 1/2 beam spacing, B2 = 1/2 beam spacing + 25mm (extracted from the dimension diagram). The product supports customization of even-numbered beams.
Technical Parameters
Detection Principle: Diffuse reflective, emitting infrared beams to detect reflected signals from objects.
Detection Distance: Maximum over 2000mm (at gear 9), minimal blind zone (compact design).
Beam Spacing: Typically 40mm (inferred from the spec table, e.g., for 4 beams: protection height 160mm = (4-1)*40mm + adjustment).
Gear Adjustment: 0-9 gears, factory default 0 (approx. 0.5m detection); higher gear increases emission intensity and distance; save method: long-press 1S or auto after 30S.
Self-Learning Mode: Activate by long-pressing 2S at default gear 0, auto-adjusts emission intensity for limited backgrounds; green light flashes, not suitable for varying background conditions.
Connection Method: Pigtail cable, compact design; wiring diagram includes power and output lines.
Environmental Adaptability: Suitable for industrial sites, avoid strong light interference or high-vibration areas.
Resolution: Minimum detectable object size related to beam spacing, typically >40mm objects.
Safety Features: As a safety light curtain, supports intrusion detection with output to stop machinery.
Working Principle
The working principle of the DAIDISIKE DD series diffuse reflective light curtain is based on photoelectric diffuse reflection technology. The device integrates the emitter and receiver in one unit (single-sided installation), emitting multiple parallel infrared beams into the detection area. When an object enters the area, its surface diffusely reflects part of the beams back to the receiver. The receiver detects changes in the reflected light signal (decrease in intensity or interruption), triggering an output signal. This principle differs from through-beam or retro-reflective types, as it relies on the object's surface reflectivity rather than opposed beams or reflectors, making it suitable for irregular objects or reflector-free scenarios.
Specific Process:
Emission Phase: Built-in LED array emits infrared beams, with intensity adjustable via gears 0-9 (higher gear for stronger emission and longer distance). In self-learning mode, the system auto-calibrates based on background reflection to optimize power.
Detection Phase: Receiver continuously monitors reflected light. If an object blocks or alters the light beyond a threshold, it is detected as intrusion.
Signal Processing: Internal circuitry processes the signal, outputting dual NPN/PNP (NO/NC). LED indicators show status: green for power on, red for alarm, digital display for current gear.
Response Mechanism: Short response time (milliseconds level), suitable for high-speed production lines. Minimal blind zone achieved through compact design, with total height formula ensuring precise coverage.
This light curtain is commonly used for safety protection (e.g., robotic arm guarding), where beam interruption outputs a signal to connect to PLC or relays, halting machine operation. Professional terms: Employs multi-beam array to form a light curtain, with resolution determined by beam spacing, supporting synchronous scanning to reduce interference.
Frequently Asked Questions
Is the DD series a Type 4 safety light curtain or a presence sensor?
The DD series is a single-sided diffuse-reflection light curtain for object detection and machinery presence monitoring, not a certified Type 4 / PL e finger-protection ESPE. For hazardous press or robot-cell guarding requiring an ISO 13855 safety distance, use a through-beam Type 4 curtain; the DD is best for position monitoring and area detection against a stable background.
What detection distance and beam options does the DD series offer?
Detection distance reaches over 2000 mm at gear 9, with a factory default of gear 0 (about 0.5 m). Beam count is customizable in even numbers from 4 to 50 (models DD0440 to DD5040), giving protection heights of 160 mm to 2000 mm and total heights of 209 mm to 2049 mm. Beam spacing is fixed at 40 mm.
How does diffuse reflection differ from a through-beam light curtain?
Diffuse reflection integrates emitter and receiver in one unit and senses infrared light bounced back off the object's surface, so it needs only single-sided installation and no opposing receiver or reflector. Through-beam curtains use separate opposed units and give higher resolution. Diffuse reflection suits irregular objects and reflector-free layouts with a stable background.
How do I set the gear and use self-learning mode?
Gears 0-9 set emission intensity and range: higher gears extend detection distance. Switch and save a gear by long-pressing the button for 1 second, or let it auto-save after 30 seconds. For self-learning, long-press for 2 seconds at default gear 0; the system auto-calibrates emission to the background while the green light flashes. Avoid backgrounds whose brightness or position changes often.
What outputs and wiring does the DD series use to stop a machine?
The DD series provides dual NPN/PNP outputs, switchable between normally open and normally closed, on a pigtail cable. On beam interruption the output switches to drive a PLC input or relay that halts the machine. Green LED shows power, red LED shows signal, and a digital display shows the active gear. Housing is yellow aluminum alloy rated IP65 for industrial sites.
