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DQBT Ultra-thin Safety Light Curtain (Optical Synchronization)

Compact, installation-friendly ultra-thin light curtain. Beam pitch 10 / 20 / 40 mm covers finger, palm and hand/arm protection, in protective heights of 70–990 mm (10 mm), 100–3940 mm (20 mm) and 120–920 mm (40 mm). Transistor outputs with NPN/PNP selection, dual-channel OSSD1/OSSD2 ≤ 200 mA, 3-core or 5-core wiring. Optical synchronization removes the sync cable and speeds commissioning. Detection distance, response time and IP rating are not published for this series — contact the factory.

View Detailed DQBT Series
Ultra-thin housing, optical sync for simpler wiring
Dual-channel NPN/PNP safety outputs (OSSD1/OSSD2)
Through-beam AOPD with clear status indicators
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Product Highlights
  • Optical synchronization between emitter and receiver: fewer cables, fast setup, robust against vibration.
  • Self-diagnosis plus short/over-current protection; clear front LEDs make the safety loop easy to troubleshoot.
  • Widest height span in the ultra-thin family: up to 198 beams at 20 mm pitch for a 3940 mm protective height from a single pair.
  • Dual-channel OSSD1/OSSD2 transistor outputs rated ≤ 200 mA, NPN/PNP selectable; 3-core or 5-core wiring.
  • Through-beam AOPD designed with reference to IEC 61496 and the machinery-safety standards ISO 13849 / ISO 13855; no type class or performance level is published for this series — confirm with the factory before use in a rated safety function.

Values are normalized from the supplied DQBT manual pages; if differences exist, the delivered datasheet and certificates prevail.

Resolution & Application Guide
Resolution (K)Typical Application
10 mmFinger protection near hazard points, assembly fixtures
20 mmPalm protection, access openings
40 mmHand/arm or presence detection for zone guarding

Protective height H = (n − 1) × K. Overall length L = P + H + J + 24 (12 mm allowance at each end). P/J per resolution; see spec tables.

Technical Parameters (DQBT Series)

CategoryItemTypical Value / OptionNotes
OpticalOperating principleThrough-beam infrared LED, modulatedEmitter/receiver pair; optical synchronization
Beam pitch (K)10 / 20 / 40 mmFinger / Palm / Hand-arm or presence
Protective height (H)H = (n − 1) × K; 70–990 (K=10), 100–3940 (K=20), 120–920 mm (K=40)n = number of beams
SynchronizationOpticalNo sync cable between emitter and receiver
Response timeContact factoryNot published for the DQBT series
Detection distanceContact factoryNot published for the DQBT series
Electrical / I/OOutputsTransistor, NPN/PNP signal selection; dual-channel OSSD1 / OSSD2≤ 200 mA per channel
Wiring3-core or 5-coreOptical sync means no extra sync line
Supply voltageContact factoryNot published for the DQBT series
IndicatorsPower / Run / BlockedFront LEDs
Mechanical / EnvironmentBody sectionContact factoryUltra-thin series; exact section not published
Overall lengthL = P + H + J + 24P/J depend on beam pitch
Ingress protectionContact factoryNot published for the DQBT series
Operating temp.Contact factoryNot published for the DQBT series
ComplianceStandardsThrough-beam AOPD designed with reference to IEC 61496; safety distance per ISO 13855No type class (Type 2/4) or performance level is published for this series — confirm with the factory
System integrationSafety relay / Safety PLCIndependent dual inputs; do not tie channels together

DQBT Series Detailed Specifications

Tables list the catalogued beam counts (n) for each beam pitch (K) with protective height H and overall length L. Model format: DQBTnn/K-H. Example: DQBT04/40-120 (K=40, n=4, H=120).

K (mm)Beams nProtective Height H (mm)P/J (mm)Overall Length L (mm)Model ExampleDetection Distance
108705/10109DQBT08/10-70Contact factory
1010905/10129DQBT10/10-90Contact factory
10121105/10149DQBT12/10-110Contact factory
10141305/10169DQBT14/10-130Contact factory
10161505/10189DQBT16/10-150Contact factory
10181705/10209DQBT18/10-170Contact factory
10201905/10229DQBT20/10-190Contact factory
10222105/10249DQBT22/10-210Contact factory
10242305/10269DQBT24/10-230Contact factory
10262505/10289DQBT26/10-250Contact factory
10282705/10309DQBT28/10-270Contact factory
10302905/10329DQBT30/10-290Contact factory
10323105/10349DQBT32/10-310Contact factory
10343305/10369DQBT34/10-330Contact factory
10363505/10389DQBT36/10-350Contact factory
10383705/10409DQBT38/10-370Contact factory
10403905/10429DQBT40/10-390Contact factory
10424105/10449DQBT42/10-410Contact factory
10444305/10469DQBT44/10-430Contact factory
10464505/10489DQBT46/10-450Contact factory
10484705/10509DQBT48/10-470Contact factory
10504905/10529DQBT50/10-490Contact factory
10525105/10549DQBT52/10-510Contact factory
10545305/10569DQBT54/10-530Contact factory
10565505/10589DQBT56/10-550Contact factory
10585705/10609DQBT58/10-570Contact factory
10605905/10629DQBT60/10-590Contact factory
10626105/10649DQBT62/10-610Contact factory
10646305/10669DQBT64/10-630Contact factory
10666505/10689DQBT66/10-650Contact factory
10686705/10709DQBT68/10-670Contact factory
10706905/10729DQBT70/10-690Contact factory
10727105/10749DQBT72/10-710Contact factory
10747305/10769DQBT74/10-730Contact factory
10767505/10789DQBT76/10-750Contact factory
10787705/10809DQBT78/10-770Contact factory
10807905/10829DQBT80/10-790Contact factory
10828105/10849DQBT82/10-810Contact factory
10848305/10869DQBT84/10-830Contact factory
10868505/10889DQBT86/10-850Contact factory
10888705/10909DQBT88/10-870Contact factory
10908905/10929DQBT90/10-890Contact factory
10929105/10949DQBT92/10-910Contact factory
10949305/10969DQBT94/10-930Contact factory
10969505/10989DQBT96/10-950Contact factory
10989705/101009DQBT98/10-970Contact factory
101009905/101029DQBT100/10-990Contact factory

Overall length uses L = P + H + J + 24. Keep the model format DQBTnn/K-H. Detection distance is not published in the DQBT catalogue data — contact the factory to confirm the operating range for your span.

Typical Applications

  • Presses / shears / press brakes: 10–20 mm beam pitch suits finger and hand protection.
  • Assembly fixtures & robot periphery: finger/palm detection with interlocked safety loop; easy maintenance.
  • Packaging / logistics: 40 mm for aisle and presence detection.
  • General machinery: integrate with a safety relay/PLC for stop, interlock and EDM monitoring.

Safety distance reference (ISO 13855): S = K × T + C, where T is machine stopping time.

Frequently Asked Questions

What safety type / performance level does the DQBT carry?

The DQBT is a through-beam opto-electronic protective device (AOPD) with dual-channel OSSD1/OSSD2 outputs — a product category designed with reference to IEC 61496 and to the machinery-safety standards ISO 13849 / ISO 13855. DAIDISIKE has not published a type classification (Type 2 / Type 4) or a performance level for the DQBT series, so none is claimed here. Request the current test documentation from the factory before specifying the DQBT into a rated safety function; where a documented Type 4 / PL e / SIL 3 device is required, use the DQT4 series.

What beam pitch do I need — 10, 20 or 40 mm?

Beam pitch sets the smallest object detected. Choose 10 mm for finger protection near hazard points and assembly fixtures, 20 mm for palm protection and access openings, and 40 mm for hand/arm or presence detection in zone guarding. Protective height is H = (n − 1) × K: 70–990 mm at 10 mm pitch, 100–3940 mm at 20 mm pitch, and 120–920 mm at 40 mm pitch. Overall length is L = P + H + J + 24; see the spec tables.

How do I calculate the ISO 13855 safety distance for the DQBT?

Use S = K × T + C, where K is the approach speed constant, T is total stopping time (machine stopping time plus the light-curtain response time), and C is an intrusion factor based on resolution. The DQBT response time is not published in the catalogue data — obtain the confirmed figure from the factory before you calculate T, and always validate the final mounting distance against your machine's measured stopping performance.

How are the OSSD outputs wired — NPN or PNP, and how many wires?

The DQBT uses transistor outputs with NPN/PNP signal selection; the dual-channel form is documented as OSSD1/OSSD2 rated ≤200 mA. Wiring is by 3-core or 5-core cable. Keep OSSD1 and OSSD2 as independent inputs to a safety relay or safety PLC — never tie the two channels together, as this defeats the dual-channel fault detection.

Can the DQBT replace an Omron, SICK or Keyence safety light curtain?

In many machine-guarding applications it can, mechanically. Match the beam pitch (10/20/40 mm), the protective height and the required operating distance to the unit being replaced, and re-verify the safety distance per ISO 13855. Optical synchronization removes the sync cable and simplifies retrofit into existing brackets. Where the original unit carried a certified Type/PL rating, confirm the equivalent documentation with the factory before swapping.

Specs reviewed by Engineer Cai, Senior Application Engineer. See certificates.

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