A long-range, through-beam safety light curtain for large machinery and guarding at distance. Rectangular 51×35 mm profile with resolutions 10/20/40/80 mm (optional 25/30 mm); typical response time ≤ 15 ms; enclosure rating IP65; high ambient light immunity. Dual-channel NPN/PNP safety outputs with 5/7-core wiring examples. Standard sensing distance 0.3–3 m (select builds 0.3–6 m; project long-range available).
51×35 mm body, robust connectorsStable through-beam guarding for long spans
Product Highlights
Long-range through-beam design with strong anti-interference electronics for stable operation across wide gates and presses.
Self-diagnosis, short/over-current protection and clear indicators for fast commissioning and troubleshooting.
≤15 ms response helps optimize ISO 13855 safety distance while maintaining productivity.
High ambient light immunity with optical filtering; resistant to flicker, arc/glare and stray light.
51×35 mm rugged body, IP65; circular aviation plug with dedicated cables; emitter/receiver core protection.
Conforms to IEC 61496-1/-2; integrate with a safety relay/PLC for PL-capable architectures.
Values normalized from the provided DQT sheets; if discrepancies exist, the official datasheet and delivered certificates take precedence.
Resolution & Application Guide
Resolution (K)
Typical Application
10 mm
Finger / close-in guarding with long spans
20 mm
Palm / access openings
40 mm
Hand/arm or body presence along aisles and perimeters
80 mm
Perimeter / body detection with fewer beams
Protective height H = (n − 1) × K. Overall length L = P + H + J + 36 (18 mm end allowance on both sides). P/J vary with resolution; see spec tables below.
Technical Parameters (DQT Series)
Category
Item
Typical Value / Option
Notes
Optical
Operating principle
Through-beam infrared LED, modulated
Emitter/receiver pair; high anti-interference
Resolution (K)
10 / 20 / 40 / 80 mm (opt. 25/30 mm)
Finger / Palm / Hand-arm / Body
Protective height (H)
H = (n−1) × K
n = number of beams
Response time
≤ 15 ms
Varies with beams
Ambient light immunity
High immunity
Filtering to suppress flicker/arc glare
Sensing range
0.3–3 m (std), 0.3–6 m (select)
Project long-range available
Electrical / I/O
Supply
DC 12/24 V; AC 110–220 V (via controller)
Reverse/over-voltage protection
Safety outputs
Dual-channel NPN / PNP (NO/NC)
5-core / 7-core examples
Channel capability
≤ 200 mA (typ.)
Transistor OSSD
Protection
Short / Over-current / Over-load
Auto recovery
Indicators
Power / Run / Blocked
Front LEDs
Connector
Circular aviation, M12 cable
Dedicated harness
Sync
Optical
Fewer cables
Mechanical / Environment
Body section
~51 × 35 mm (rectangular)
Aluminum body; reinforced end-caps
Overall length
L = P + H + J + 36
18 mm allowance ×2
Ingress protection
IP65
Dust-tight, water-jet resistant
Operating temp.
−10 ~ +40 °C
Storage −25 ~ +55 °C
Humidity
Operating 35–85 %RH
Storage 35–95 %RH
Compliance
Standards
IEC 61496-1/-2
Safety distance per ISO 13855
Certifications
CE (typ.)
Refer to delivered certificates
System integration
Safety relay / Safety PLC
Independent dual inputs
DQT Series Detailed Specifications
Tables enumerate beam counts (n) per resolution (K) with protective height H and overall length L. Model format: DQT-K-NN-H (e.g., DQT-40-08-280).
K (mm)
Beams n
Protective Height H (mm)
P/J (mm)
Overall Length L (mm)
Model Example
Std. Range
10
12
110
5/32
183
DQT-10-12-110
0.3–3 m
10
14
130
5/32
203
DQT-10-14-130
0.3–3 m
10
16
150
5/32
223
DQT-10-16-150
0.3–3 m
10
18
170
5/32
243
DQT-10-18-170
0.3–3 m
10
20
190
5/32
263
DQT-10-20-190
0.3–3 m
10
22
210
5/32
283
DQT-10-22-210
0.3–3 m
10
24
230
5/32
303
DQT-10-24-230
0.3–3 m
10
26
250
5/32
323
DQT-10-26-250
0.3–3 m
10
28
270
5/32
343
DQT-10-28-270
0.3–3 m
10
30
290
5/32
363
DQT-10-30-290
0.3–3 m
10
32
310
5/32
383
DQT-10-32-310
0.3–3 m
10
34
330
5/32
403
DQT-10-34-330
0.3–3 m
10
36
350
5/32
423
DQT-10-36-350
0.3–3 m
10
38
370
5/32
443
DQT-10-38-370
0.3–3 m
10
40
390
5/32
463
DQT-10-40-390
0.3–3 m
10
42
410
5/32
483
DQT-10-42-410
0.3–3 m
10
44
430
5/32
503
DQT-10-44-430
0.3–3 m
10
46
450
5/32
523
DQT-10-46-450
0.3–3 m
10
48
470
5/32
543
DQT-10-48-470
0.3–3 m
10
50
490
5/32
563
DQT-10-50-490
0.3–3 m
10
52
510
5/32
583
DQT-10-52-510
0.3–3 m
10
54
530
5/32
603
DQT-10-54-530
0.3–3 m
10
56
550
5/32
623
DQT-10-56-550
0.3–3 m
10
58
570
5/32
643
DQT-10-58-570
0.3–3 m
10
60
590
5/32
663
DQT-10-60-590
0.3–3 m
10
62
610
5/32
683
DQT-10-62-610
0.3–3 m
10
64
630
5/32
703
DQT-10-64-630
0.3–3 m
10
66
650
5/32
723
DQT-10-66-650
0.3–3 m
10
68
670
5/32
743
DQT-10-68-670
0.3–3 m
10
70
690
5/32
763
DQT-10-70-690
0.3–3 m
10
72
710
5/32
783
DQT-10-72-710
0.3–3 m
For extended 0.3–6 m builds and wiring (5/7-core), specify on order. Keep model format DQT-K-NN-H.
Typical Applications
Presses / shears / large gates: long-range guarding with fewer cables, high noise immunity.
Robot cells / logistics perimeters: body/presence detection with 40–80 mm resolutions.
Assembly / access openings: 10–20 mm for finger/palm detection over long spans.
General machinery: integrate with a safety relay/PLC (EDM/feedback) for reliable stops and interlocks.
Safety distance reference (ISO 13855): S = K × T + C, where T is the measured machine stopping time.
Frequently Asked Questions
What resolution should I choose for the DQT long-range light curtain?
Match the resolution to the smallest body part that can reach the hazard: 10 mm for finger protection, 20 mm for palm/hand access, and 40/80 mm for hand-arm or body/perimeter guarding. The DQT offers 10/20/40/80 mm (25/30 mm optional), so one long-range series covers presses, large gates and robot-cell perimeters.
Is the DQT a Type 4 safety light curtain?
The DQT is built to the IEC 61496-1/-2 through-beam ESPE architecture with dual-channel safety outputs and self-diagnosis. The achieved Performance Level (up to PL e / Cat. 4 under ISO 13849-1) comes from the complete safety function — the curtain plus a certified safety relay or safety PLC with EDM feedback.
Can the DQT replace an Omron F3SG-SR, SICK deTec or Keyence light curtain?
In most long-range cases yes — the DQT matches common 10/20/40/80 mm resolutions and dual NPN/PNP outputs, so it fits the same safety loop. Because it is purpose-built for distance (0.3–3 m standard, 0.3–6 m on select builds), confirm the protective height and resolution against the unit being replaced.
How do I calculate the minimum safety distance for the DQT?
Use ISO 13855: S = K × T + C, where K = 2000 mm/s is the hand-speed constant, T is the machine stop time plus the curtain response (≤ 15 ms), and C is the intrusion factor derived from the resolution. Our ISO 13855 calculator computes the safety distance for your stopping time and resolution.
What wiring, ingress protection and response time does the DQT have?
The DQT provides dual-channel NPN/PNP safety outputs with 5-core and 7-core wiring examples, feeding into a safety relay or safety PLC with EDM feedback. It is rated IP65 (dust-tight, water-jet resistant) with a typical response time ≤ 15 ms and high ambient-light immunity for stable long-range guarding.
