Safety light curtain engineered for high-risk machinery, designed to IEC 61496-1/-2 Type 4 architecture. Suitable for safety chains targeting PL e (EN ISO 13849), SIL 3, Cat.4 when integrated with a certified safety relay or safety PLC (verification by integrator required). Redundant OSSD dual-channel outputs with self-diagnostics and EDM monitoring. 30×30 mm compact body; resolutions 7.5/15/30 mm. Model sizing follows L = P + H + J, where H=(n−1)×K.
Designed to Type 4 architecture; suitable for PL e / SIL 3 / Cat.4 safety chainsRedundant OSSD dual outputs with self-diagnosticsStandard brackets and aviation/M12 connectors
Product Highlights
Designed to Type 4 architecture (IEC 61496-1/-2) — suitable for PL e (EN ISO 13849) / SIL 3 / Cat.4 safety chains when integrated with a certified safety relay/PLC; engineered for high-risk safeguarding (final classification validated by integrator).
Redundant OSSD with self-diagnostics; fault/short/over-current protection and clear indicators.
EDM monitoring ready; supports reset logic and external device feedback.
Flexible options: muting/blanking, cascade, mirror protection and more (per model).
Resolutions 7.5 / 15 / 30 mm; robust anti-interference up to strong ambient light.
30×30 mm compact body; IP65; aviation/M12 connectors and standard right-angle brackets.
Summarized from supplied manuals. If any discrepancy exists, the official datasheet and delivered certificates prevail.
Resolution & Application Guide
Resolution (K)
Typical Application
7.5 mm
Finger protection near hazard; dense beam fields
15 mm
Palm protection; general access openings
30 mm
Hand/arm or body presence; aisle and perimeter guarding
Protective height H = (n − 1) × K. Overall length L = P + H + J. P/J depend on resolution; see spec tabs.
Technical Parameters (DQT4 Series)
Category
Item
Typical Value / Option
Notes
Safety
Architecture
Designed to IEC 61496 Type 4; suitable for PL e (EN ISO 13849) / SIL 3 / Cat.4 chains
Use with a certified safety relay/PLC; integrator validates the complete function
Outputs
Redundant OSSD dual-channel (PNP/NPN models)
Self-diagnostics; EDM monitoring
Response
≤ 20 ms (typ.)
Varies with beams/resolution
Functions
Muting / Blanking / Cascade (per model)
Reset logic supported
Immunity
High ambient-light immunity
Designed to resist flicker/glare
Compliance
IEC 61496-1/-2
Safety distance design per ISO 13855
Optical
Resolutions (K)
7.5 / 15 / 30 mm
Finger / Palm / Hand–Body
Protective height (H)
H = (n − 1) × K
n = beam count
Detection distance
0.3–3 m
Application dependent
Operating principle
Through-beam infrared LED, modulated
Emitter/Receiver pair
Indicators
Power / Blocked / Status
Optional numeric display
Electrical
Supply
DC 12/24 V; AC 110–220 V (with controller)
Reverse/over-voltage protection
Channel capability
≤ 200 mA (typ.)
Transistor outputs
Protection
Short / Over-current / Over-load
Auto recovery
Connector
Aviation / M12
Standard cables & brackets
Sync
Optical synchronization
Reduced wiring, stable commissioning
Mechanical / Environment
Body section
~30 × 30 mm
Aluminum housing
Overall length
L = P + H + J
P/J by resolution
Ingress protection
IP65
Dust-tight, water-jet resistant
Temperature / Humidity
−10 ~ +55 °C; 20 °C, RH ≤ 85%
Typical values
DQT4 Series Detailed Specifications
Tables list typical beam counts (n) for each resolution (K) with protective height H and overall length L. Model format: DQT4-K-NN-H. Sizing constants taken from mechanical drawings.
K (mm)
Beams n
Protective Height H (mm)
P/J (mm)
Overall Length L (mm)
Model Example
Detection Distance
7.5
15
105
13.74/19.46
138.2
DQT4-7.5-15-105
0.3–3 m
7.5
23
165
13.74/19.46
198.2
DQT4-7.5-23-165
0.3–3 m
7.5
31
225
13.74/19.46
258.2
DQT4-7.5-31-225
0.3–3 m
7.5
39
285
13.74/19.46
318.2
DQT4-7.5-39-285
0.3–3 m
7.5
47
345
13.74/19.46
378.2
DQT4-7.5-47-345
0.3–3 m
7.5
55
405
13.74/19.46
438.2
DQT4-7.5-55-405
0.3–3 m
7.5
63
465
13.74/19.46
498.2
DQT4-7.5-63-465
0.3–3 m
7.5
71
525
13.74/19.46
558.2
DQT4-7.5-71-525
0.3–3 m
7.5
79
585
13.74/19.46
618.2
DQT4-7.5-79-585
0.3–3 m
7.5
87
645
13.74/19.46
678.2
DQT4-7.5-87-645
0.3–3 m
7.5
95
705
13.74/19.46
738.2
DQT4-7.5-95-705
0.3–3 m
7.5
103
765
13.74/19.46
798.2
DQT4-7.5-103-765
0.3–3 m
7.5
111
825
13.74/19.46
858.2
DQT4-7.5-111-825
0.3–3 m
7.5
119
885
13.74/19.46
918.2
DQT4-7.5-119-885
0.3–3 m
7.5
127
945
13.74/19.46
978.2
DQT4-7.5-127-945
0.3–3 m
7.5
135
1005
13.74/19.46
1038.2
DQT4-7.5-135-1005
0.3–3 m
7.5
143
1065
13.74/19.46
1098.2
DQT4-7.5-143-1065
0.3–3 m
7.5
151
1125
13.74/19.46
1158.2
DQT4-7.5-151-1125
0.3–3 m
7.5
159
1185
13.74/19.46
1218.2
DQT4-7.5-159-1185
0.3–3 m
7.5
167
1245
13.74/19.46
1278.2
DQT4-7.5-167-1245
0.3–3 m
7.5
175
1305
13.74/19.46
1338.2
DQT4-7.5-175-1305
0.3–3 m
7.5
183
1365
13.74/19.46
1398.2
DQT4-7.5-183-1365
0.3–3 m
7.5
191
1425
13.74/19.46
1458.2
DQT4-7.5-191-1425
0.3–3 m
7.5
199
1485
13.74/19.46
1518.2
DQT4-7.5-199-1485
0.3–3 m
7.5
207
1545
13.74/19.46
1578.2
DQT4-7.5-207-1545
0.3–3 m
7.5
215
1605
13.74/19.46
1638.2
DQT4-7.5-215-1605
0.3–3 m
7.5
223
1665
13.74/19.46
1698.2
DQT4-7.5-223-1665
0.3–3 m
7.5
231
1725
13.74/19.46
1758.2
DQT4-7.5-231-1725
0.3–3 m
7.5
239
1785
13.74/19.46
1818.2
DQT4-7.5-239-1785
0.3–3 m
7.5
247
1845
13.74/19.46
1878.2
DQT4-7.5-247-1845
0.3–3 m
7.5
255
1905
13.74/19.46
1938.2
DQT4-7.5-255-1905
0.3–3 m
7.5
263
1965
13.74/19.46
1998.2
DQT4-7.5-263-1965
0.3–3 m
7.5
271
2025
13.74/19.46
2058.2
DQT4-7.5-271-2025
0.3–3 m
7.5
279
2085
13.74/19.46
2118.2
DQT4-7.5-279-2085
0.3–3 m
7.5
287
2145
13.74/19.46
2178.2
DQT4-7.5-287-2145
0.3–3 m
7.5
295
2205
13.74/19.46
2238.2
DQT4-7.5-295-2205
0.3–3 m
7.5
303
2265
13.74/19.46
2298.2
DQT4-7.5-303-2265
0.3–3 m
7.5
311
2325
13.74/19.46
2358.2
DQT4-7.5-311-2325
0.3–3 m
7.5
319
2385
13.74/19.46
2418.2
DQT4-7.5-319-2385
0.3–3 m
Model example format: DQT4-K-NN-H. Use L = P + H + J with P/J from drawings. For special lengths or functions (muting/blanking), contact DAIDISIKE.
Typical Applications
Presses / press brakes / shears: near-hazard finger and palm protection with 7.5–15 mm resolutions.
Robot cells & assembly lines: perimeter and access guarding; muting/blanking for material flow.
Packaging & logistics: 30 mm for aisle and body presence detection.
General machinery: integrate with a safety relay/PLC for interlock, EDM and monitored reset.
Safety distance reference (ISO 13855): S = K × T + C, where T is machine stopping time.
Frequently Asked Questions
Is the DQT4 a Type 4 / PL e safety light curtain?
The DQT4 is designed to IEC 61496-1/-2 Type 4 architecture with redundant OSSD dual-channel outputs and self-diagnostics. It is suitable for safety chains targeting PL e (EN ISO 13849), SIL 3 or Cat.4 when integrated with a certified safety relay or safety PLC. The integrator must validate the complete safety function on the actual machine.
What resolution do I need — 7.5 mm, 15 mm or 30 mm?
Resolution determines what the curtain detects. The 7.5 mm option gives finger protection for near-hazard guarding, 15 mm suits palm detection on general access openings, and 30 mm covers hand, arm or body presence for aisle and perimeter guarding. Choose the finest resolution your application and required safety distance allow.
How do I calculate the safety distance for the DQT4?
Use the ISO 13855 formula S = K × T + C, where K is the approach speed (typically 2000 mm/s for hand detection), T is the total stopping time of the machine plus curtain response time, and C is an intrusion factor based on resolution. Finer resolutions reduce C, allowing closer mounting. Always verify against your machine's measured stopping time.
How are the OSSD outputs wired and what is EDM?
The DQT4 provides redundant OSSD dual-channel outputs (PNP/NPN models) that switch off when a beam is blocked or a fault is detected. EDM (External Device Monitoring) checks the feedback contacts of the downstream safety relay or contactors before allowing a restart, catching welded contacts. Wire OSSD pairs separately and avoid cross-faults; commission with monitored reset logic.
Can the DQT4 replace an Omron, SICK or Keyence safety light curtain?
In most cases yes. The DQT4 shares the common Type 4 architecture, redundant OSSD wiring, EDM monitoring and 7.5/15/30 mm resolutions used by Omron F3SG-SR, SICK deTec and Keyence units, with a compact 30×30 mm body, IP65 rating and M12/aviation connectors. Match resolution, protective height and connector type, and re-verify the safety distance for your machine.
