Safety light curtain engineered for high-risk machinery, to IEC 61496 Type 4, for safety chains at PL e (EN ISO 13849), SIL 3, Cat.4 when integrated with a certified safety relay or safety PLC (verification by integrator required). Redundant dual-channel PNP OSSD outputs with self-diagnostics and EDM support, over 9-core wiring, pairing with a safety PLC or the DQSRN safety relay. Resolutions 7.5 / 15 / 30 mm — finger, palm and arm — with protective heights 90–5970 mm. Model sizing follows L = P + H + J, where H = (n−1) × K.
The catalogued Type 4 series (IEC 61496) — PL e (EN ISO 13849) / SIL 3 / Cat.4 safety chains when integrated with a certified safety relay/PLC; final classification validated by the integrator.
EDM supported; pairs with a safety PLC or the DQSRN safety relay.
7.5 mm finger resolution — the finest in the DAIDISIKE range, plus 15 mm palm and 30 mm arm options.
Protective heights 90–5970 mm, up to 319 beams at 7.5 mm pitch.
9-core wiring; DQCA-01/02/03/05 brackets plus the DQT4-09 top/bottom two-end mount supplied as standard.
Detection distance, response time, supply voltage, IP rating, operating temperature, housing dimensions and housing material are not published in the DQT4 catalogue data, so no figures are stated on this page — contact the factory for the confirmed values for your build.
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
IEC 61496 Type 4; PL e (EN ISO 13849) / SIL 3 / Cat.4
Use with a certified safety relay/PLC; integrator validates the complete function
Outputs
Redundant, independent dual-channel PNP OSSD
Self-diagnosing; EDM supported
Controller
Safety PLC or DQSRN safety relay
Monitored reset logic
Response
Contact factory
Not published for the DQT4 series
Optical
Resolutions (K)
7.5 / 15 / 30 mm
Finger / Palm / Arm
Detection accuracy
Finest 7.5 mm
Densest beam field in the range
Protective height (H)
H = (n − 1) × K; 90–5970 mm
n = beam count, up to 319 at 7.5 mm pitch
Detection distance
Contact factory
Not published for the DQT4 series
Operating principle
Through-beam infrared LED, modulated
Emitter/Receiver pair
Electrical
Wiring
9-core
Per build
Supply voltage
Contact factory
Not published for the DQT4 series
Indicators
Power / Blocked / Status
Front indicators
Mechanical / Environment
Body section / material
Contact factory
Not published for the DQT4 series
Overall length
L = P + H + J
P/J by resolution
Ingress protection
Contact factory
Not published for the DQT4 series
Mounting
DQCA-01/02/03/05 + DQT4-09 (standard)
Top/bottom two-end fixing
DQT4 Series Detailed Specifications
Tables list the catalogued beam counts (n) for each resolution (K) with protective height H and overall length L. Model format: DQT4 nn/K-H — note the space after DQT4, e.g. DQT4 15/7.5-105. 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 15/7.5-105
Contact factory
7.5
23
165
13.74/19.46
198.2
DQT4 23/7.5-165
Contact factory
7.5
31
225
13.74/19.46
258.2
DQT4 31/7.5-225
Contact factory
7.5
39
285
13.74/19.46
318.2
DQT4 39/7.5-285
Contact factory
7.5
47
345
13.74/19.46
378.2
DQT4 47/7.5-345
Contact factory
7.5
55
405
13.74/19.46
438.2
DQT4 55/7.5-405
Contact factory
7.5
63
465
13.74/19.46
498.2
DQT4 63/7.5-465
Contact factory
7.5
71
525
13.74/19.46
558.2
DQT4 71/7.5-525
Contact factory
7.5
79
585
13.74/19.46
618.2
DQT4 79/7.5-585
Contact factory
7.5
87
645
13.74/19.46
678.2
DQT4 87/7.5-645
Contact factory
7.5
95
705
13.74/19.46
738.2
DQT4 95/7.5-705
Contact factory
7.5
103
765
13.74/19.46
798.2
DQT4 103/7.5-765
Contact factory
7.5
111
825
13.74/19.46
858.2
DQT4 111/7.5-825
Contact factory
7.5
119
885
13.74/19.46
918.2
DQT4 119/7.5-885
Contact factory
7.5
127
945
13.74/19.46
978.2
DQT4 127/7.5-945
Contact factory
7.5
135
1005
13.74/19.46
1038.2
DQT4 135/7.5-1005
Contact factory
7.5
143
1065
13.74/19.46
1098.2
DQT4 143/7.5-1065
Contact factory
7.5
151
1125
13.74/19.46
1158.2
DQT4 151/7.5-1125
Contact factory
7.5
159
1185
13.74/19.46
1218.2
DQT4 159/7.5-1185
Contact factory
7.5
167
1245
13.74/19.46
1278.2
DQT4 167/7.5-1245
Contact factory
7.5
175
1305
13.74/19.46
1338.2
DQT4 175/7.5-1305
Contact factory
7.5
183
1365
13.74/19.46
1398.2
DQT4 183/7.5-1365
Contact factory
7.5
191
1425
13.74/19.46
1458.2
DQT4 191/7.5-1425
Contact factory
7.5
199
1485
13.74/19.46
1518.2
DQT4 199/7.5-1485
Contact factory
7.5
207
1545
13.74/19.46
1578.2
DQT4 207/7.5-1545
Contact factory
7.5
215
1605
13.74/19.46
1638.2
DQT4 215/7.5-1605
Contact factory
7.5
223
1665
13.74/19.46
1698.2
DQT4 223/7.5-1665
Contact factory
7.5
231
1725
13.74/19.46
1758.2
DQT4 231/7.5-1725
Contact factory
7.5
239
1785
13.74/19.46
1818.2
DQT4 239/7.5-1785
Contact factory
7.5
247
1845
13.74/19.46
1878.2
DQT4 247/7.5-1845
Contact factory
7.5
255
1905
13.74/19.46
1938.2
DQT4 255/7.5-1905
Contact factory
7.5
263
1965
13.74/19.46
1998.2
DQT4 263/7.5-1965
Contact factory
7.5
271
2025
13.74/19.46
2058.2
DQT4 271/7.5-2025
Contact factory
7.5
279
2085
13.74/19.46
2118.2
DQT4 279/7.5-2085
Contact factory
7.5
287
2145
13.74/19.46
2178.2
DQT4 287/7.5-2145
Contact factory
7.5
295
2205
13.74/19.46
2238.2
DQT4 295/7.5-2205
Contact factory
7.5
303
2265
13.74/19.46
2298.2
DQT4 303/7.5-2265
Contact factory
7.5
311
2325
13.74/19.46
2358.2
DQT4 311/7.5-2325
Contact factory
7.5
319
2385
13.74/19.46
2418.2
DQT4 319/7.5-2385
Contact factory
Model example format: DQT4 nn/K-H (space after DQT4). Use L = P + H + J with P/J from drawings. Detection distance is not published in the DQT4 catalogue data — contact the factory to confirm the operating range for your span, and for any special lengths.
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, with protective heights to 5970 mm from a single pair.
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?
Yes — the DQT4 is the DAIDISIKE series catalogued to IEC 61496 Type 4, with redundant self-diagnosing dual-channel PNP OSSD outputs and EDM support, for safety chains at PL e (EN ISO 13849), SIL 3 or Cat.4 when integrated with a certified safety relay or safety PLC. It pairs with a safety PLC or the DQSRN safety relay. 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 the curtain response time, and C is an intrusion factor based on resolution. Finer resolutions reduce C, allowing closer mounting. The DQT4 response time is not published in the catalogue data — obtain the confirmed figure from the factory before you calculate T, and always verify against your machine's measured stopping time.
How are the OSSD outputs wired and what is EDM?
The DQT4 provides two independent, redundant PNP OSSD safety outputs that switch off when a beam is blocked or a fault is detected, wired via a 9-core cable. EDM (External Device Monitoring) checks the feedback contacts of the downstream safety relay or contactors before allowing a restart, catching welded contacts. Wire the OSSD pair separately and avoid cross-faults; commission with monitored reset logic, using a safety PLC or the DQSRN safety relay.
Can the DQT4 replace an Omron, SICK or Keyence safety light curtain?
In most cases yes. The DQT4 shares the Type 4 architecture, redundant OSSD wiring and EDM monitoring used by Omron F3SG-SR, SICK deTec and Keyence units, and its 7.5 mm finger resolution is finer than the 14 mm those series typically offer. Match resolution, protective height and connector type, and re-verify the safety distance for your machine. Confirm detection distance and response time with the factory — they are not published in the DQT4 catalogue data.
