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DQBT Ultra-thin Safety Light Curtain (Optical Synchronization)

Compact, installation-friendly light curtain with an ultra-slim body around ~30 × 15 mm. Resolutions 10 / 20 / 40 mm cover finger, palm and hand/arm protection. Standard sensing range 0.3–3 m; strong light immunity ≥10,000 Lux; typical response time ≤ 15 ms; enclosure rating IP65. Dual-channel NPN/PNP safety outputs (NO/NC). Optical synchronization reduces wiring and speeds commissioning.

View Detailed DQBT SeriesDQBT Video Demo
DQBT ultra-thin safety light curtain main image
DQBT machine safety light curtain, installation example
Ultra-thin housing, optical sync for simpler wiring
DQBT presence sensing safety device (PSSD) illustration
Dual-channel NPN/PNP safety outputs (OSSD1/OSSD2)
DQBT ESPE product view
ESPE compliant; IP65; clear indicators
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.
  • ≤ 15 ms response supports shorter ISO 13855 safety distances when paired with a certified safety relay/PLC.
  • Strong ambient-light immunity ≥10,000 Lux; filtering suppresses flicker and stray light.
  • Ultra-thin body ~30×15 mm, IP65; optional aviation/M12 connection and standard brackets.
  • Designed to IEC 61496-1/-2; integrate with safety controller for high-level architectures.

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
Resolution (K)10 / 20 / 40 mmFinger / Palm / Hand-arm or presence
Protective height (H)H = (n − 1) × Kn = number of beams
Response time≤ 15 msVaries with beam count
Ambient light immunity≥ 10,000 LuxIncidence ≥ 5°
Sensing range0.3–3 m (standard)Longer ranges on request
Electrical / I/OSupplyDC 12/24 V; AC 110–220 V (with controller)Reverse/over-voltage protection
Safety outputsDual-channel NPN / PNP, NO/NC selectableOSSD1 / OSSD2
Channel capability≤ 200 mA (typ.)Transistor output
ProtectionShort / Over-current / Over-loadAuto recovery
IndicatorsPower / Run / BlockedClear front LEDs
ConnectorM12 / Aviation plugOptional
SynchronizationOpticalFewer cables, strong anti-interference
Mechanical / EnvironmentBody section~30 × 15 mm (ultra-thin)Aluminum + reinforced end caps
Overall lengthL = P + H + J + 24P/J depend on resolution
Ingress protectionIP65Dust-tight, water-jet resistant
Operating temp.−10 ~ +40 °CStorage −25 ~ +55 °C
HumidityOperating 35–85 %RHStorage 35–95 %RH
ComplianceStandardsIEC 61496-1/-2Safety distance per ISO 13855
CertificationsCE etc.Refer to delivered certificates
System integrationSafety relay / Safety PLCIndependent dual inputs; do not tie channels together

DQBT Series Detailed Specifications

Tables list typical beam counts (n) for each resolution (K) with protective height H and overall length L. Model format: DQBT-K-NN-H. Example: DQBT-40-04-120 (K=40, n=4, H=120).

K (mm)Beams nProtective Height H (mm)P/J (mm)Overall Length L (mm)Model ExampleRange
108705/10109DQBT-10-08-700.3–3 m
1010905/10129DQBT-10-10-900.3–3 m
10121105/10149DQBT-10-12-1100.3–3 m
10141305/10169DQBT-10-14-1300.3–3 m
10161505/10189DQBT-10-16-1500.3–3 m
10181705/10209DQBT-10-18-1700.3–3 m
10201905/10229DQBT-10-20-1900.3–3 m
10222105/10249DQBT-10-22-2100.3–3 m
10242305/10269DQBT-10-24-2300.3–3 m
10262505/10289DQBT-10-26-2500.3–3 m
10282705/10309DQBT-10-28-2700.3–3 m
10302905/10329DQBT-10-30-2900.3–3 m
10323105/10349DQBT-10-32-3100.3–3 m
10343305/10369DQBT-10-34-3300.3–3 m
10363505/10389DQBT-10-36-3500.3–3 m
10383705/10409DQBT-10-38-3700.3–3 m
10403905/10429DQBT-10-40-3900.3–3 m
10424105/10449DQBT-10-42-4100.3–3 m
10444305/10469DQBT-10-44-4300.3–3 m
10464505/10489DQBT-10-46-4500.3–3 m
10484705/10509DQBT-10-48-4700.3–3 m
10504905/10529DQBT-10-50-4900.3–3 m
10525105/10549DQBT-10-52-5100.3–3 m
10545305/10569DQBT-10-54-5300.3–3 m
10565505/10589DQBT-10-56-5500.3–3 m
10585705/10609DQBT-10-58-5700.3–3 m
10605905/10629DQBT-10-60-5900.3–3 m
10626105/10649DQBT-10-62-6100.3–3 m
10646305/10669DQBT-10-64-6300.3–3 m
10666505/10689DQBT-10-66-6500.3–3 m
10686705/10709DQBT-10-68-6700.3–3 m
10706905/10729DQBT-10-70-6900.3–3 m
10727105/10749DQBT-10-72-7100.3–3 m
10747305/10769DQBT-10-74-7300.3–3 m
10767505/10789DQBT-10-76-7500.3–3 m
10787705/10809DQBT-10-78-7700.3–3 m
10807905/10829DQBT-10-80-7900.3–3 m
10828105/10849DQBT-10-82-8100.3–3 m
10848305/10869DQBT-10-84-8300.3–3 m
10868505/10889DQBT-10-86-8500.3–3 m
10888705/10909DQBT-10-88-8700.3–3 m
10908905/10929DQBT-10-90-8900.3–3 m
10929105/10949DQBT-10-92-9100.3–3 m
10949305/10969DQBT-10-94-9300.3–3 m
10969505/10989DQBT-10-96-9500.3–3 m
10989705/101009DQBT-10-98-9700.3–3 m
101009905/101029DQBT-10-100-9900.3–3 m

Overall length uses L = P + H + J + 24. Keep the model format DQBT-K-NN-H.

Typical Applications

  • Presses / shears / press brakes: 10–20 mm resolutions suit hand protection; fast response enables shorter safety distance.
  • 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

Is the DQBT a Type 2 or Type 4 safety light curtain?

The DQBT is built to IEC 61496-1/-2 as an electro-sensitive protective device (ESPE) with dual-channel OSSD1/OSSD2 outputs. The achievable Type/PL depends on the certified safety relay or PLC it drives and your risk assessment. For finger protection at hazard points, use the 10 mm resolution and confirm the required performance level for your machine.

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

Resolution 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, so confirm beam count and overall length L = P + H + J + 24 from 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 plus light curtain ≤ 15 ms response), and C is an intrusion factor based on resolution. A finer resolution and faster response let you mount the curtain closer to the hazard. 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 provides dual-channel safety outputs selectable as NPN or PNP, NO/NC, with 3-wire and 5-wire wiring examples for presses, packaging and assembly stations. Keep OSSD1 and OSSD2 as independent inputs to a safety relay or safety PLC for EDM monitoring — 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. Match the resolution (10/20/40 mm), protective height, 0.3–3 m sensing range, IP65 rating and dual-channel NPN/PNP output to the unit being replaced, and confirm the required Type/PL with your safety controller. The ultra-thin ~30×15 mm body and optical synchronization simplify wiring and retrofit into existing brackets.

Specs reviewed by Engineer Cai, Senior Application Engineer. CE compliant (IEC 61496-1/-2) — see certificates.

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